diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,34 @@
 # Changelog for the Clash project
 
+## 1.8.2 *Jan 3rd 2025*
+
+Added:
+* Support for GHC 9.10 [#2758](https://github.com/clash-lang/clash-compiler/pull/2758)
+* Support for GHC 9.8.4 [#2852](https://github.com/clash-lang/clash-compiler/issues/2852)
+* Add `ShowX`, `NFDataX` instances for `Proxy` [#2637](https://github.com/clash-lang/clash-compiler/pull/2637)
+* Added `Clash.Sized.Vector.ToTuple.vecToTuple`: a way to safely work around incomplete patterns warnings on patterns involving `Vec`tors. [#2862](https://github.com/clash-lang/clash-compiler/pull/2682)
+* Added operator precedences for infix usage of functions exported from `Clash.Class.Num`: `mul`, `add`, `sub`, `satMul`, `satAdd`, `satSub`, `boundedMul`, `boundedAdd`, and `boundedSub`. This means that expressions such as `` a `add` b `mul` c `` now get parsed as `` a `add` (b `mul` c) `` instead of `` (a `add` b) `mul` c ``. [#2719](https://github.com/clash-lang/clash-compiler/pull/2719)
+
+Changed:
+* `BitVector n` now has an implementation for `ensureSpine` which ensures the constructor is present. [#2702](https://github.com/clash-lang/clash-compiler/pull/2702)
+* `xToBV` is now located in `Clash.Sized.Internal.BitVector` to avoid circular dependencies. [#2702](https://github.com/clash-lang/clash-compiler/pull/2702)
+* The error messages that mention the valid ranges for out-of-range inputs have been improved to be more intuitive: one of `<empty range>`, `[n]` or `[n..m]`. All _n..m_ ranges are now ordered with the lower bound on the left. [#2733](https://github.com/clash-lang/clash-compiler/pull/2733)
+
+Fixed:
+* cabal: Make `workaround-ghc-mmap-crash` a noop on non-x86_64. Fixes [#2656](https://github.com/clash-lang/clash-compiler/issues/2656)
+* Clash no longer hides error messages if it fails to load external (precompiled) modules. Note: this fix only works from GHC 9.0 on. See [#2365](https://github.com/clash-lang/clash-compiler/issues/2365)
+* HDL generation fails when using multiple-hidden feature in combination with synthesis attributes [#2593](https://github.com/clash-lang/clash-compiler/issues/2593)
+* Clash no longer errors out in the netlist generation stage when a polymorphic function is applied to type X in one alternative of a case-statement and applied to a newtype wrapper of type X in a different alternative. See [#2828](https://github.com/clash-lang/clash-compiler/issues/2628)
+* various issues with black boxes and evaluator rules for number-related primitives [#2689](https://github.com/clash-lang/clash-compiler/pull/2689)
+* `genBitVector` no longer contains off-by-one error on for generated Naturals [#2704](https://github.com/clash-lang/clash-compiler/pull/2704)
+* (+>>.) and (.<<+) such that they are compliant with (+>>) and (<<+) for vectors of zero length in the sense that the input vector is kept unchanged. [#2730](https://github.com/clash-lang/clash-compiler/issues/2730)
+* Removed `stringsearch` dependency from `v16-upgrade-primitives`. See [#2726](https://github.com/clash-lang/clash-compiler/issues/2726)
+* Bug in the compile-time evaluator [#2781](https://github.com/clash-lang/clash-compiler/issues/2781)
+* Exponentiation (`Clash.Class.Exp`) is now right-associative with a precedence level of 8 (`infixr 8`). By accident, it used to lack a fixity declaration, meaning it was implicitly left-associative at level 9. [#2818](https://github.com/clash-lang/clash-compiler/pull/2818)
+* Unused argument warnings on writeToBiSignal# [#2822](https://github.com/clash-lang/clash-compiler/pull/2822)
+* Clash errored saying it cannot translate a globally recursive function in code that originally only contains let-bound (local) recursion [#2839](https://github.com/clash-lang/clash-compiler/issues/2839)
+* Clash generates illegal Verilog names [#2845](https://github.com/clash-lang/clash-compiler/issues/2845)
+
 ## 1.8.1 *Nov 10th 2023*
 
 * Bump package dependencies to allow inclusion in stackage-nightly
diff --git a/clash-ghc.cabal b/clash-ghc.cabal
--- a/clash-ghc.cabal
+++ b/clash-ghc.cabal
@@ -1,6 +1,6 @@
 Cabal-version:        2.2
 Name:                 clash-ghc
-Version:              1.8.1
+Version:              1.8.2
 Synopsis:             Clash: a functional hardware description language - GHC frontend
 Description:
   Clash is a functional hardware description language that borrows both its
@@ -79,7 +79,7 @@
     GHC-Options: -dynamic
   -- Note that multiple -with-rtsopts are not cumulative, so we can't add the
   -- common RTS options in the unconditional GHC-Options
-  if flag(workaround-ghc-mmap-crash)
+  if arch(x86_64) && flag(workaround-ghc-mmap-crash)
     GHC-Options: "-with-rtsopts=-A128m -xm20000000"
   else
     GHC-Options: -with-rtsopts=-A128m
@@ -121,7 +121,9 @@
 library
   import:             common-options
   HS-Source-Dirs:     src-ghc, src-bin-common
-  if impl(ghc >= 9.8.0)
+  if impl(ghc >= 9.10.0)
+    HS-Source-Dirs: src-bin-9.10
+  elif impl(ghc >= 9.8.0)
     HS-Source-Dirs: src-bin-9.8
   elif impl(ghc >= 9.6.0)
     HS-Source-Dirs: src-bin-9.6
@@ -153,49 +155,48 @@
                       base                      >= 4.11     && < 5,
                       bytestring                >= 0.9      && < 0.13,
                       Cabal,
-                      containers                >= 0.5.4.0  && < 0.7,
+                      containers                >= 0.5.4.0  && < 0.8,
                       data-binary-ieee754       >= 0.4.4    && < 0.6,
                       directory                 >= 1.2      && < 1.4,
                       extra                     >= 1.6      && < 1.8,
-                      filepath                  >= 1.3      && < 1.5,
+                      filepath                  >= 1.3      && < 1.6,
                       process                   >= 1.2      && < 1.7,
-                      hashable                  >= 1.1.2.3  && < 1.5,
+                      hashable                  >= 1.1.2.3  && < 1.6,
                       haskeline                 >= 0.7.0.3  && < 0.9,
-                      lens                      >= 4.10     && < 5.3,
+                      lens                      >= 4.10     && < 5.4,
                       mtl                       >= 2.1.1    && < 2.4,
                       split                     >= 0.2.3    && < 0.3,
                       text                      >= 1.2.2    && < 2.2,
                       transformers              >= 0.5.2.0  && < 0.7,
                       unordered-containers      >= 0.2.1.0  && < 0.3,
 
-                      clash-lib                 == 1.8.1,
-                      clash-prelude             == 1.8.1,
-                      concurrent-supply         >= 0.1.7    && < 0.2,
+                      clash-lib                 == 1.8.2,
+                      clash-prelude             == 1.8.2,
                       ghc-typelits-extra        >= 0.3.2    && < 0.5,
                       ghc-typelits-knownnat     >= 0.6      && < 0.8,
                       ghc-typelits-natnormalise >= 0.6      && < 0.8,
                       deepseq                   >= 1.3.0.2  && < 1.6,
-                      time                      >= 1.4.0.1  && < 1.14,
-                      ghc-boot                  >= 8.6.0    && < 9.9,
+                      time                      >= 1.4.0.1  && < 1.15,
+                      ghc-boot                  >= 8.6.0    && < 9.11,
                       ghc-prim                  >= 0.3.1.0  && < 0.12,
-                      ghci                      >= 8.6.0    && < 9.9,
+                      ghci                      >= 8.6.0    && < 9.11,
                       uniplate                  >= 1.6.12   && < 1.8,
                       reflection                >= 2.1.2    && < 3.0,
                       primitive                 >= 0.5.0.1  && < 1.0,
                       string-interpolate        ^>= 0.3,
-                      template-haskell          >= 2.8.0.0  && < 2.22,
+                      template-haskell          >= 2.8.0.0  && < 2.23,
                       utf8-string               >= 1.0.0.0  && < 1.1.0.0,
                       vector                    >= 0.11     && < 1.0
 
   if os(windows)
     -- 8.8 is broken on Windows - it randomly segfaults
-    Build-Depends: ghc >= 8.6.0 && < 8.8.0 || >= 8.10.0 && < 9.9
+    Build-Depends: ghc >= 8.6.0 && < 8.8.0 || >= 8.10.0 && < 9.11
   elif os(darwin)
     -- 8.10 is broken on macOS - it exits tests with status code -11
-    Build-Depends: ghc >= 8.6.0 && < 8.10.0 || >= 9.0.0 && < 9.9
+    Build-Depends: ghc >= 8.6.0 && < 8.10.0 || >= 9.0.0 && < 9.11
   else
     -- Unix
-    Build-Depends: ghc >= 8.6.0 && < 9.9
+    Build-Depends: ghc >= 8.6.0 && < 9.11
 
   if impl(ghc >= 8.10.0)
     Build-Depends:    exceptions                >= 0.10.4   && < 0.11,
@@ -244,6 +245,7 @@
                       Clash.GHC.GHC2Core
                       Clash.GHC.LoadInterfaceFiles
                       Clash.GHC.Util
+                      Data.Text.Extra
                       Paths_clash_ghc
   if impl(ghc >= 8.8.0)
     Other-Modules:    Clash.GHCi.Util
diff --git a/src-bin-8.10/Clash/GHCi/UI.hs b/src-bin-8.10/Clash/GHCi/UI.hs
--- a/src-bin-8.10/Clash/GHCi/UI.hs
+++ b/src-bin-8.10/Clash/GHCi/UI.hs
@@ -150,6 +150,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 
 import           Clash.GHC.PartialEval
@@ -2191,7 +2192,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-861/Clash/GHCi/UI.hs b/src-bin-861/Clash/GHCi/UI.hs
--- a/src-bin-861/Clash/GHCi/UI.hs
+++ b/src-bin-861/Clash/GHCi/UI.hs
@@ -144,6 +144,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 
 import           Clash.GHC.PartialEval
@@ -2022,7 +2023,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0 <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
                   iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-881/Clash/GHCi/UI.hs b/src-bin-881/Clash/GHCi/UI.hs
--- a/src-bin-881/Clash/GHCi/UI.hs
+++ b/src-bin-881/Clash/GHCi/UI.hs
@@ -147,6 +147,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 
 import           Clash.GHC.PartialEval
@@ -2113,7 +2114,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-9.0/Clash/GHCi/UI.hs b/src-bin-9.0/Clash/GHCi/UI.hs
--- a/src-bin-9.0/Clash/GHCi/UI.hs
+++ b/src-bin-9.0/Clash/GHCi/UI.hs
@@ -153,6 +153,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 import           Clash.GHC.Evaluator
 import           Clash.GHC.GenerateBindings
@@ -2230,7 +2231,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-9.10/Clash/GHCi/Leak.hs b/src-bin-9.10/Clash/GHCi/Leak.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/GHCi/Leak.hs
@@ -0,0 +1,85 @@
+{-# LANGUAGE RecordWildCards, LambdaCase #-}
+module Clash.GHCi.Leak
+  ( LeakIndicators
+  , getLeakIndicators
+  , checkLeakIndicators
+  ) where
+
+import Control.Monad
+import Data.Bits
+import Foreign.Ptr (ptrToIntPtr, intPtrToPtr)
+import GHC
+import GHC.Ptr (Ptr (..))
+import Clash.GHCi.Util
+import GHC.Driver.Env
+import GHC.Driver.Ppr
+import GHC.Utils.Outputable
+import GHC.Unit.Module.ModDetails
+import GHC.Unit.Home.ModInfo
+import GHC.Platform (target32Bit)
+import GHC.Linker.Types
+import Prelude
+import System.Mem
+import System.Mem.Weak
+import GHC.Types.Unique.DFM
+import Control.Exception
+
+-- Checking for space leaks in GHCi. See #15111, and the
+-- -fghci-leak-check flag.
+
+data LeakIndicators = LeakIndicators [LeakModIndicators]
+
+data LeakModIndicators = LeakModIndicators
+  { leakMod :: Weak HomeModInfo
+  , leakIface :: Weak ModIface
+  , leakDetails :: Weak ModDetails
+  , leakLinkable :: [Maybe (Weak Linkable)]
+  }
+
+-- | Grab weak references to some of the data structures representing
+-- the currently loaded modules.
+getLeakIndicators :: HscEnv -> IO LeakIndicators
+getLeakIndicators hsc_env =
+  fmap LeakIndicators $
+    forM (eltsUDFM (hsc_HPT hsc_env)) $ \hmi@HomeModInfo{..} -> do
+      leakMod <- mkWeakPtr hmi Nothing
+      leakIface <- mkWeakPtr hm_iface Nothing
+      leakDetails <- mkWeakPtr hm_details Nothing
+      leakLinkable <-  mkWeakLinkables hm_linkable
+      return $ LeakModIndicators{..}
+  where
+    mkWeakLinkables :: HomeModLinkable -> IO [Maybe (Weak Linkable)]
+    mkWeakLinkables (HomeModLinkable mbc mo) =
+      mapM (\ln -> traverse (flip mkWeakPtr Nothing <=< evaluate) ln) [mbc, mo]
+
+-- | Look at the LeakIndicators collected by an earlier call to
+-- `getLeakIndicators`, and print messasges if any of them are still
+-- alive.
+checkLeakIndicators :: DynFlags -> LeakIndicators -> IO ()
+checkLeakIndicators dflags (LeakIndicators leakmods)  = do
+  performGC
+  forM_ leakmods $ \LeakModIndicators{..} -> do
+    deRefWeak leakMod >>= \case
+      Nothing -> return ()
+      Just hmi ->
+        report ("HomeModInfo for " ++
+          showSDoc dflags (ppr (mi_module (hm_iface hmi)))) (Just hmi)
+    deRefWeak leakIface >>= \case
+      Nothing -> return ()
+      Just miface -> report ("ModIface:" ++ moduleNameString (moduleName (mi_module miface))) (Just miface)
+    deRefWeak leakDetails >>= report "ModDetails"
+    forM_ leakLinkable $ \l -> forM_ l $ \l' -> deRefWeak l' >>= report "Linkable"
+ where
+  report :: String -> Maybe a -> IO ()
+  report _ Nothing = return ()
+  report msg (Just a) = do
+    addr <- anyToPtr a
+    putStrLn ("-fghci-leak-check: " ++ msg ++ " is still alive at " ++
+              show (maskTagBits addr))
+
+  tagBits
+    | target32Bit (targetPlatform dflags) = 2
+    | otherwise = 3
+
+  maskTagBits :: Ptr a -> Ptr a
+  maskTagBits p = intPtrToPtr (ptrToIntPtr p .&. complement (shiftL 1 tagBits - 1))
diff --git a/src-bin-9.10/Clash/GHCi/UI.hs b/src-bin-9.10/Clash/GHCi/UI.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/GHCi/UI.hs
@@ -0,0 +1,4883 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE MagicHash #-}
+{-# LANGUAGE MultiWayIf #-}
+{-# LANGUAGE NondecreasingIndentation #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RecordWildCards #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
+{-# LANGUAGE ViewPatterns #-}
+{-# LANGUAGE TypeFamilies #-}
+
+{-# OPTIONS -fno-warn-name-shadowing #-}
+-- This module does a lot of it
+
+-----------------------------------------------------------------------------
+--
+-- GHC Interactive User Interface
+--
+-- (c) The GHC Team 2005-2006
+--
+-----------------------------------------------------------------------------
+
+module Clash.GHCi.UI (
+        interactiveUI,
+        GhciSettings(..),
+        defaultGhciSettings,
+        ghciCommands,
+        ghciWelcomeMsg,
+        makeHDL
+    ) where
+
+-- GHCi
+import qualified Clash.GHCi.UI.Monad as GhciMonad ( args, runStmt, runDecls' )
+import Clash.GHCi.UI.Monad hiding ( args, runStmt )
+import Clash.GHCi.UI.Info
+import Clash.GHCi.UI.Exception
+import GHC.Runtime.Debugger
+
+-- The GHC interface
+import GHC.Runtime.Interpreter
+import GHCi.RemoteTypes
+import GHCi.BreakArray( breakOn, breakOff )
+import GHC.ByteCode.Types
+import GHC.Core.DataCon
+import GHC.Core.ConLike
+import GHC.Core.PatSyn
+import GHC.Driver.Flags
+import GHC.Driver.Errors
+import GHC.Driver.Errors.Types
+import GHC.Driver.Phases
+import GHC.Driver.Session as DynFlags
+import GHC.Driver.Ppr hiding (printForUser)
+import GHC.Utils.Error hiding (traceCmd)
+import GHC.Driver.Monad ( modifySession )
+import GHC.Driver.Make ( newIfaceCache, ModIfaceCache(..) )
+import GHC.Driver.Config.Parser (initParserOpts)
+import GHC.Driver.Config.Diagnostic
+import qualified GHC
+import GHC ( LoadHowMuch(..), Target(..),  TargetId(..),
+             Resume, SingleStep, Ghc,
+             GetDocsFailure(..), pushLogHookM,
+             getModuleGraph, handleSourceError, ms_mod )
+import GHC.Driver.Main (hscParseModuleWithLocation, hscParseStmtWithLocation)
+import GHC.Hs.ImpExp
+import GHC.Hs
+import GHC.Driver.Env
+import GHC.Runtime.Context
+import GHC.Types.TyThing
+import GHC.Types.TyThing.Ppr
+import GHC.Core.TyCo.Ppr
+import GHC.Types.SafeHaskell ( getSafeMode )
+import GHC.Types.SourceError ( SourceError )
+import GHC.Types.Name
+import GHC.Types.Var ( varType )
+import GHC.Iface.Syntax ( showToHeader )
+import GHC.Builtin.Names
+import GHC.Builtin.Types( stringTyCon_RDR )
+import GHC.Types.Name.Reader as RdrName ( getGRE_NameQualifier_maybes, getRdrName )
+import GHC.Types.SrcLoc as SrcLoc
+import qualified GHC.Parser.Lexer as Lexer
+import GHC.Parser.Header ( toArgs )
+import qualified GHC.Parser.Header as Header
+import GHC.Types.PkgQual
+
+import GHC.Unit
+import GHC.Unit.Finder as Finder
+import GHC.Unit.Module.Graph (filterToposortToModules)
+import GHC.Unit.Module.ModSummary
+
+import GHC.Data.StringBuffer
+import GHC.Utils.Outputable
+import GHC.Utils.Logger
+
+-- Other random utilities
+import GHC.Types.Basic hiding ( isTopLevel )
+import GHC.Data.Graph.Directed
+import GHC.Utils.Encoding
+import GHC.Data.FastString
+import qualified GHC.Linker.Loader as Loader
+import GHC.Data.Maybe ( orElse, expectJust )
+import GHC.Types.Name.Set
+import GHC.Utils.Panic hiding ( showException, try )
+import GHC.Utils.Misc
+import qualified GHC.LanguageExtensions as LangExt
+import GHC.Data.Bag (unitBag)
+import qualified GHC.Data.Strict as Strict
+import GHC.Types.Error
+
+-- Haskell Libraries
+import System.Console.Haskeline as Haskeline
+
+import Control.Applicative hiding (empty)
+import Control.DeepSeq (deepseq)
+import Control.Monad as Monad
+import Control.Monad.Catch as MC
+import Control.Monad.IO.Class
+import Control.Monad.Trans.Class
+import Control.Monad.Trans.Except
+
+import Data.Array
+import qualified Data.ByteString.Char8 as BS
+import Data.Char
+import Data.Function
+import Data.IORef ( IORef, modifyIORef, newIORef, readIORef, writeIORef )
+import Data.List ( elemIndices, find, intercalate, intersperse, minimumBy,
+                   isPrefixOf, isSuffixOf, nub, partition, sort, sortBy, (\\) )
+import qualified Data.List.NonEmpty as NE
+import qualified Data.Set as S
+import Data.Maybe
+import qualified Data.Map as M
+import Data.IntMap.Strict (IntMap)
+import qualified Data.IntMap.Strict as IntMap
+import Data.Time.LocalTime ( getZonedTime )
+import Data.Time.Format ( formatTime, defaultTimeLocale )
+import Data.Version ( showVersion )
+import qualified Data.Semigroup as S
+import Prelude hiding ((<>))
+
+import GHC.Utils.Exception as Exception hiding (catch, mask, handle)
+import Foreign hiding (void)
+import GHC.Stack hiding (SrcLoc(..))
+import GHC.Unit.Env
+import GHC.Unit.Home.ModInfo
+
+import System.Directory
+import System.Environment
+import System.Exit ( exitWith, ExitCode(..) )
+import System.FilePath
+import System.Info
+import System.IO
+import System.IO.Error
+import System.IO.Unsafe ( unsafePerformIO )
+import System.Process
+import Text.Printf
+import Text.Read ( readMaybe )
+import Text.Read.Lex (isSymbolChar)
+
+import Unsafe.Coerce
+
+#if !defined(mingw32_HOST_OS)
+import System.Posix hiding ( getEnv )
+#else
+import qualified System.Win32
+#endif
+
+import GHC.IO.Exception ( IOErrorType(InvalidArgument) )
+import GHC.IO.Handle ( hFlushAll )
+import GHC.TopHandler ( topHandler )
+
+import Clash.GHCi.Leak
+import qualified GHC.Unit.Module.Graph as GHC
+
+-- clash additions
+import           Clash.Backend (Backend(initBackend, hdlKind, primDirs))
+import           Clash.Backend.SystemVerilog (SystemVerilogState)
+import           Clash.Backend.VHDL (VHDLState)
+import           Clash.Backend.Verilog (VerilogState)
+import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
+import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
+import           Clash.GHC.Evaluator
+import           Clash.GHC.GenerateBindings
+import           Clash.GHC.NetlistTypes
+import           Clash.GHC.PartialEval
+import           Clash.GHCi.Common
+import           Clash.Util (clashLibVersion, reportTimeDiff)
+import           Data.Proxy
+import qualified Data.Time.Clock as Clock
+import qualified Paths_clash_ghc
+
+-----------------------------------------------------------------------------
+
+data GhciSettings = GhciSettings {
+        availableCommands :: [Command],
+        shortHelpText     :: String,
+        fullHelpText      :: String,
+        defPrompt         :: PromptFunction,
+        defPromptCont     :: PromptFunction
+    }
+
+defaultGhciSettings :: IORef ClashOpts -> GhciSettings
+defaultGhciSettings opts =
+    GhciSettings {
+        availableCommands = ghciCommands opts,
+        shortHelpText     = defShortHelpText,
+        defPrompt         = default_prompt,
+        defPromptCont     = default_prompt_cont,
+        fullHelpText      = defFullHelpText
+    }
+
+ghciWelcomeMsg :: String
+ghciWelcomeMsg = "Clashi, version " ++ Data.Version.showVersion Paths_clash_ghc.version ++
+                 " (using clash-lib, version " ++ Data.Version.showVersion clashLibVersion ++
+                 "):\nhttps://clash-lang.org/  :? for help"
+
+ghciCommands :: IORef ClashOpts -> [Command]
+ghciCommands opts = map mkCmd [
+  -- Hugs users are accustomed to :e, so make sure it doesn't overlap
+  ("?",         keepGoing help,                 noCompletion),
+  ("add",       keepGoingPaths addModule,       completeFilename),
+  ("abandon",   keepGoing abandonCmd,           noCompletion),
+  ("break",     keepGoing breakCmd,             completeBreakpoint),
+  ("back",      keepGoing backCmd,              noCompletion),
+  ("browse",    keepGoing' (browseCmd False),   completeModule),
+  ("browse!",   keepGoing' (browseCmd True),    completeModule),
+  ("cd",        keepGoingMulti' changeDirectory,     completeFilename),
+  ("check",     keepGoing' checkModule,         completeHomeModule),
+  ("continue",  keepGoing continueCmd,          noCompletion),
+  ("cmd",       keepGoing cmdCmd,               completeExpression),
+  ("def",       keepGoing (defineMacro False),  completeExpression),
+  ("def!",      keepGoing (defineMacro True),   completeExpression),
+  ("delete",    keepGoing deleteCmd,            noCompletion),
+  ("disable",   keepGoing disableCmd,           noCompletion),
+  ("doc",       keepGoing' docCmd,              completeIdentifier),
+  ("edit",      keepGoingMulti' editFile,            completeFilename),
+  ("enable",    keepGoing enableCmd,            noCompletion),
+  ("force",     keepGoing forceCmd,             completeExpression),
+  ("forward",   keepGoing forwardCmd,           noCompletion),
+  ("help",      keepGoingMulti help,                 noCompletion),
+  ("history",   keepGoingMulti historyCmd,           noCompletion),
+  ("info",      keepGoingMulti' (info False),        completeIdentifier),
+  ("info!",     keepGoingMulti' (info True),         completeIdentifier),
+  ("issafe",    keepGoing' isSafeCmd,           completeModule),
+  ("ignore",    keepGoing ignoreCmd,            noCompletion),
+  ("kind",      keepGoingMulti' (kindOfType False),  completeIdentifier),
+  ("kind!",     keepGoingMulti' (kindOfType True),   completeIdentifier),
+  ("load",      keepGoingPaths loadModule_,     completeHomeModuleOrFile),
+  ("load!",     keepGoingPaths loadModuleDefer, completeHomeModuleOrFile),
+  ("list",      keepGoing' listCmd,             noCompletion),
+  ("module",    keepGoing moduleCmd,            completeSetModule),
+  ("main",      keepGoing runMain,              completeFilename),
+  ("print",     keepGoing printCmd,             completeExpression),
+  ("quit",      quit,                           noCompletion),
+  ("reload",    keepGoingMulti' reloadModule,   noCompletion),
+  ("reload!",   keepGoingMulti' reloadModuleDefer,   noCompletion),
+  ("run",       keepGoing runRun,               completeFilename),
+  ("script",    keepGoing' scriptCmd,           completeFilename),
+  ("set",       keepGoingMulti setCmd,          completeSetOptions),
+  ("seti",      keepGoingMulti setiCmd,         completeSeti),
+  ("show",      keepGoingMulti' showCmd,        completeShowOptions),
+  ("showi",     keepGoing showiCmd,             completeShowiOptions),
+  ("sprint",    keepGoing sprintCmd,            completeExpression),
+  ("step",      keepGoing stepCmd,              completeIdentifier),
+  ("steplocal", keepGoing stepLocalCmd,         completeIdentifier),
+  ("stepmodule",keepGoing stepModuleCmd,        completeIdentifier),
+  ("type",      keepGoingMulti' typeOfExpr,          completeExpression),
+  ("trace",     keepGoing traceCmd,             completeExpression),
+  ("unadd",     keepGoingPaths unAddModule,     completeFilename),
+  ("undef",     keepGoing undefineMacro,        completeMacro),
+  ("unset",     keepGoing unsetOptions,         completeSetOptions),
+  ("where",     keepGoing whereCmd,             noCompletion),
+  ("vhdl",      keepGoingPaths (makeVHDL opts), completeHomeModuleOrFile),
+  ("verilog",   keepGoingPaths (makeVerilog opts), completeHomeModuleOrFile),
+  ("systemverilog",keepGoingPaths (makeSystemVerilog opts), completeHomeModuleOrFile),
+  ("instances", keepGoing' instancesCmd,        completeExpression)
+  ] ++ map mkCmdHidden [ -- hidden commands
+  ("all-types", keepGoing' allTypesCmd),
+  ("complete",  keepGoing completeCmd),
+  ("loc-at",    keepGoing' locAtCmd),
+  ("type-at",   keepGoing' typeAtCmd),
+  ("uses",      keepGoing' usesCmd)
+  ]
+ where
+  mkCmd (n,a,c) = Command { cmdName = n
+                          , cmdAction = a
+                          , cmdHidden = False
+                          , cmdCompletionFunc = c
+                          }
+
+  mkCmdHidden (n,a) = Command { cmdName = n
+                              , cmdAction = a
+                              , cmdHidden = True
+                              , cmdCompletionFunc = noCompletion
+                              }
+
+-- We initialize readline (in the interactiveUI function) to use
+-- word_break_chars as the default set of completion word break characters.
+-- This can be overridden for a particular command (for example, filename
+-- expansion shouldn't consider '/' to be a word break) by setting the third
+-- entry in the Command tuple above.
+--
+-- NOTE: in order for us to override the default correctly, any custom entry
+-- must be a SUBSET of word_break_chars.
+word_break_chars :: String
+word_break_chars = spaces ++ specials ++ symbols
+
+word_break_chars_pred :: Char -> Bool
+word_break_chars_pred '.' = False
+word_break_chars_pred c = c `elem` (spaces ++ specials) || isSymbolChar c
+
+symbols, specials, spaces :: String
+symbols = "!#$%&*+/<=>?@\\^|-~"
+specials = "(),;[]`{}"
+spaces = " \t\n"
+
+flagWordBreakChars :: String
+flagWordBreakChars = " \t\n"
+
+
+showSDocForUser' :: GHC.GhcMonad m => SDoc -> m String
+showSDocForUser' doc = do
+    dflags <- getDynFlags
+    unit_state <- hsc_units <$> GHC.getSession
+    name_ppr_ctx <- GHC.getNamePprCtx
+    pure $ showSDocForUser dflags unit_state name_ppr_ctx doc
+
+showSDocForUserQualify :: GHC.GhcMonad m => SDoc -> m String
+showSDocForUserQualify doc = do
+    dflags <- getDynFlags
+    unit_state <- hsc_units <$> GHC.getSession
+    pure $ showSDocForUser dflags unit_state alwaysQualify doc
+
+
+keepGoing :: (String -> GHCi ()) -> (String -> InputT GHCi CmdExecOutcome)
+keepGoing a str = keepGoing' (lift . a) str
+
+keepGoingMulti :: (String -> GHCi ()) -> (String -> InputT GHCi CmdExecOutcome)
+keepGoingMulti a str = keepGoingMulti' (lift . a) str
+
+keepGoing' :: GhciMonad m => (a -> m ()) -> a -> m CmdExecOutcome
+keepGoing' a str = do
+  in_multi <- inMultiMode
+  if in_multi
+    then
+      liftIO $ hPutStrLn stderr "Command is not supported (yet) in multi-mode"
+    else
+      a str
+  return CmdSuccess
+
+-- For commands which are actually support in multi-mode, initially just :reload
+keepGoingMulti' :: GhciMonad m => (String -> m ()) -> String -> m CmdExecOutcome
+keepGoingMulti' a str = a str >> return CmdSuccess
+
+inMultiMode :: GhciMonad m => m Bool
+inMultiMode = multiMode <$> getGHCiState
+
+keepGoingPaths :: ([FilePath] -> InputT GHCi ()) -> (String -> InputT GHCi CmdExecOutcome)
+keepGoingPaths a str
+ = do case toArgsNoLoc str of
+          Left err -> liftIO $ hPutStrLn stderr err >> return CmdSuccess
+          Right args -> keepGoing' a args
+
+defShortHelpText :: String
+defShortHelpText = "use :? for help.\n"
+
+defFullHelpText :: String
+defFullHelpText =
+  " Commands available from the prompt:\n" ++
+  "\n" ++
+  "   <statement>                 evaluate/run <statement>\n" ++
+  "   :                           repeat last command\n" ++
+  "   :{\\n ..lines.. \\n:}\\n       multiline command\n" ++
+  "   :add [*]<module> ...        add module(s) to the current target set\n" ++
+  "   :browse[!] [[*]<mod>]       display the names defined by module <mod>\n" ++
+  "                               (!: more details; *: all top-level names)\n" ++
+  "   :cd <dir>                   change directory to <dir>\n" ++
+  "   :cmd <expr>                 run the commands returned by <expr>::IO String\n" ++
+  "   :complete <dom> [<rng>] <s> list completions for partial input string\n" ++
+  "   :def[!] <cmd> <expr>        define command :<cmd> (later defined command has\n" ++
+  "                               precedence, ::<cmd> is always a builtin command)\n" ++
+  "                               (!: redefine an existing command name)\n" ++
+  "   :doc <name>                 display docs for the given name (experimental)\n" ++
+  "   :edit <file>                edit file\n" ++
+  "   :edit                       edit last module\n" ++
+  "   :help, :?                   display this list of commands\n" ++
+  "   :info[!] [<name> ...]       display information about the given names\n" ++
+  "                               (!: do not filter instances)\n" ++
+  "   :instances <type>           display the class instances available for <type>\n" ++
+  "   :issafe [<mod>]             display safe haskell information of module <mod>\n" ++
+  "   :kind[!] <type>             show the kind of <type>\n" ++
+  "                               (!: also print the normalised type)\n" ++
+  "   :load[!] [*]<module> ...    load module(s) and their dependents\n" ++
+  "                               (!: defer type errors)\n" ++
+  "   :main [<arguments> ...]     run the main function with the given arguments\n" ++
+  "   :module [+/-] [*]<mod> ...  set the context for expression evaluation\n" ++
+  "   :quit                       exit GHCi\n" ++
+  "   :reload[!]                  reload the current module set\n" ++
+  "                               (!: defer type errors)\n" ++
+  "   :run function [<arguments> ...] run the function with the given arguments\n" ++
+  "   :script <file>              run the script <file>\n" ++
+  "   :type <expr>                show the type of <expr>\n" ++
+  "   :type +d <expr>             show the type of <expr>, defaulting type variables\n" ++
+  "   :unadd <module> ...         remove module(s) from the current target set\n" ++
+  "   :undef <cmd>                undefine user-defined command :<cmd>\n" ++
+  "   ::<cmd>                     run the builtin command\n" ++
+  "   :!<command>                 run the shell command <command>\n" ++
+  "   :vhdl                       synthesize currently loaded module to vhdl\n" ++
+  "   :vhdl [<module>]            synthesize specified modules/files to vhdl\n" ++
+  "   :verilog                    synthesize currently loaded module to verilog\n" ++
+  "   :verilog [<module>]         synthesize specified modules/files to verilog\n" ++
+  "   :systemverilog              synthesize currently loaded module to systemverilog\n" ++
+  "   :systemverilog [<module>]   synthesize specified modules/files to systemverilog\n" ++
+  "\n" ++
+  " -- Commands for debugging:\n" ++
+  "\n" ++
+  "   :abandon                    at a breakpoint, abandon current computation\n" ++
+  "   :back [<n>]                 go back in the history N steps (after :trace)\n" ++
+  "   :break [<mod>] <l> [<col>]  set a breakpoint at the specified location\n" ++
+  "   :break <name>               set a breakpoint on the specified function\n" ++
+  "   :continue [<count>]         resume after a breakpoint [and set break ignore count]\n" ++
+  "   :delete <number> ...        delete the specified breakpoints\n" ++
+  "   :delete *                   delete all breakpoints\n" ++
+  "   :disable <number> ...       disable the specified breakpoints\n" ++
+  "   :disable *                  disable all breakpoints\n" ++
+  "   :enable <number> ...        enable the specified breakpoints\n" ++
+  "   :enable *                   enable all breakpoints\n" ++
+  "   :force <expr>               print <expr>, forcing unevaluated parts\n" ++
+  "   :forward [<n>]              go forward in the history N step s(after :back)\n" ++
+  "   :history [<n>]              after :trace, show the execution history\n" ++
+  "   :ignore <breaknum> <count>  for break <breaknum> set break ignore <count>\n" ++
+  "   :list                       show the source code around current breakpoint\n" ++
+  "   :list <identifier>          show the source code for <identifier>\n" ++
+  "   :list [<module>] <line>     show the source code around line number <line>\n" ++
+  "   :print [<name> ...]         show a value without forcing its computation\n" ++
+  "   :sprint [<name> ...]        simplified version of :print\n" ++
+  "   :step                       single-step after stopping at a breakpoint\n"++
+  "   :step <expr>                single-step into <expr>\n"++
+  "   :steplocal                  single-step within the current top-level binding\n"++
+  "   :stepmodule                 single-step restricted to the current module\n"++
+  "   :trace                      trace after stopping at a breakpoint\n"++
+  "   :trace <expr>               evaluate <expr> with tracing on (see :history)\n"++
+
+  "\n" ++
+  " -- Commands for changing settings:\n" ++
+  "\n" ++
+  "   :set <option> ...           set options\n" ++
+  "   :seti <option> ...          set options for interactive evaluation only\n" ++
+  "   :set local-config { source | ignore }\n" ++
+  "                               set whether to source .ghci in current dir\n" ++
+  "                               (loading untrusted config is a security issue)\n" ++
+  "   :set args <arg> ...         set the arguments returned by System.Environment.getArgs\n" ++
+  "   :set prog <progname>        set the value returned by System.Environment.getProgName\n" ++
+  "   :set prompt <prompt>        set the prompt used in GHCi\n" ++
+  "   :set prompt-cont <prompt>   set the continuation prompt used in GHCi\n" ++
+  "   :set prompt-function <expr> set the function to handle the prompt\n" ++
+  "   :set prompt-cont-function <expr>\n" ++
+  "                               set the function to handle the continuation prompt\n" ++
+  "   :set editor <cmd>           set the command used for :edit\n" ++
+  "   :set stop [<n>] <cmd>       set the command to run when a breakpoint is hit\n" ++
+  "   :unset <option> ...         unset options\n" ++
+  "\n" ++
+  "  Options for ':set' and ':unset':\n" ++
+  "\n" ++
+  "    +m            allow multiline commands\n" ++
+  "    +r            revert top-level expressions after each evaluation\n" ++
+  "    +s            print timing/memory stats after each evaluation\n" ++
+  "    +t            print type after evaluation\n" ++
+  "    +c            collect type/location info after loading modules\n" ++
+  "    -<flags>      most GHC command line flags can also be set here\n" ++
+  "                         (eg. -v2, -XFlexibleInstances, etc.)\n" ++
+  "                    for GHCi-specific flags, see User's Guide,\n"++
+  "                    Flag reference, Interactive-mode options\n" ++
+  "\n" ++
+  " -- Commands for displaying information:\n" ++
+  "\n" ++
+  "   :show bindings              show the current bindings made at the prompt\n" ++
+  "   :show breaks                show the active breakpoints\n" ++
+  "   :show context               show the breakpoint context\n" ++
+  "   :show imports               show the current imports\n" ++
+  "   :show linker                show current linker state\n" ++
+  "   :show modules               show the currently loaded modules\n" ++
+  "   :show packages              show the currently active package flags\n" ++
+  "   :show paths                 show the currently active search paths\n" ++
+  "   :show language              show the currently active language flags\n" ++
+  "   :show targets               show the current set of targets\n" ++
+  "   :show <setting>             show value of <setting>, which is one of\n" ++
+  "                                  [args, prog, editor, stop]\n" ++
+  "   :showi language             show language flags for interactive evaluation\n" ++
+  "\n" ++
+  " The User's Guide has more information. An online copy can be found here:\n" ++
+  "\n" ++
+  "   https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/ghci.html\n" ++
+  "\n"
+
+findEditor :: IO String
+findEditor = do
+    getEnv "VISUAL" <|> getEnv "EDITOR" <|> defaultEditor
+  where
+    defaultEditor = do
+#if defined(mingw32_HOST_OS)
+      win <- System.Win32.getWindowsDirectory
+      return (win </> "notepad.exe")
+#else
+      return ""
+#endif
+
+default_progname, default_stop :: String
+default_progname = "<interactive>"
+default_stop = ""
+
+default_prompt, default_prompt_cont :: PromptFunction
+default_prompt = generatePromptFunctionFromString "clashi> "
+default_prompt_cont = generatePromptFunctionFromString "clashi| "
+
+default_args :: [String]
+default_args = []
+
+interactiveUI :: GhciSettings -> [(FilePath, Maybe UnitId, Maybe Phase)] -> Maybe [String]
+              -> Ghc ()
+interactiveUI config srcs maybe_exprs = do
+   -- This is a HACK to make sure dynflags are not overwritten when setting
+   -- options. When GHCi is made properly multi component it should be removed.
+   modifySession (\env -> hscSetActiveUnitId (hscActiveUnitId env) env)
+   -- HACK! If we happen to get into an infinite loop (eg the user
+   -- types 'let x=x in x' at the prompt), then the thread will block
+   -- on a blackhole, and become unreachable during GC.  The GC will
+   -- detect that it is unreachable and send it the NonTermination
+   -- exception.  However, since the thread is unreachable, everything
+   -- it refers to might be finalized, including the standard Handles.
+   -- This sounds like a bug, but we don't have a good solution right
+   -- now.
+   _ <- liftIO $ newStablePtr stdin
+   _ <- liftIO $ newStablePtr stdout
+   _ <- liftIO $ newStablePtr stderr
+
+    -- Initialise buffering for the *interpreted* I/O system
+   (nobuffering, flush) <- runInternal initInterpBuffering
+
+   -- The initial set of DynFlags used for interactive evaluation is the same
+   -- as the global DynFlags, plus -XExtendedDefaultRules and
+   -- -XNoMonomorphismRestriction.
+   -- See Note [Changing language extensions for interactive evaluation] #10857
+   dflags <- getDynFlags
+   let dflags' = (xopt_set_unlessExplSpec
+                      LangExt.ExtendedDefaultRules xopt_set)
+               . (xopt_set_unlessExplSpec
+                      LangExt.MonomorphismRestriction xopt_unset)
+               $ dflags
+   GHC.setInteractiveDynFlags dflags'
+   _ <- GHC.setProgramDynFlags
+               -- Set Opt_KeepGoing so that :reload loads as much as
+               -- possible
+               (gopt_set dflags Opt_KeepGoing)
+
+   -- Update the LogAction. Ensure we don't override the user's log action lest
+   -- we break -ddump-json (#14078)
+   lastErrLocationsRef <- liftIO $ newIORef []
+   pushLogHookM (ghciLogAction lastErrLocationsRef)
+
+   when (isNothing maybe_exprs) $ do
+        -- Only for GHCi (not runghc and ghc -e):
+
+        -- Turn buffering off for the compiled program's stdout/stderr
+        turnOffBuffering_ nobuffering
+        -- Turn buffering off for GHCi's stdout
+        liftIO $ hFlush stdout
+        liftIO $ hSetBuffering stdout NoBuffering
+        -- We don't want the cmd line to buffer any input that might be
+        -- intended for the program, so unbuffer stdin.
+        liftIO $ hSetBuffering stdin NoBuffering
+        liftIO $ hSetBuffering stderr NoBuffering
+#if defined(mingw32_HOST_OS)
+        -- On Unix, stdin will use the locale encoding.  The IO library
+        -- doesn't do this on Windows (yet), so for now we use UTF-8,
+        -- for consistency with GHC 6.10 and to make the tests work.
+        liftIO $ hSetEncoding stdin utf8
+#endif
+
+   default_editor <- liftIO $ findEditor
+   eval_wrapper <- mkEvalWrapper default_progname default_args
+   let prelude_import =
+         case simpleImportDecl preludeModuleName of
+           -- Set to True because Prelude is implicitly imported.
+           impDecl@ImportDecl{ideclExt=ext} -> impDecl{ideclExt = ext{ideclImplicit=True}}
+   hsc_env <- GHC.getSession
+   let in_multi = length (hsc_all_home_unit_ids hsc_env) > 1
+   empty_cache <- liftIO newIfaceCache
+   startGHCi (runGHCi srcs maybe_exprs)
+        GHCiState{ progname           = default_progname,
+                   args               = default_args,
+                   evalWrapper        = eval_wrapper,
+                   prompt             = defPrompt config,
+                   prompt_cont        = defPromptCont config,
+                   stop               = default_stop,
+                   editor             = default_editor,
+                   options            = [],
+                   multiMode          = in_multi,
+                   localConfig        = SourceLocalConfig,
+                   -- We initialize line number as 0, not 1, because we use
+                   -- current line number while reporting errors which is
+                   -- incremented after reading a line.
+                   line_number        = 0,
+                   break_ctr          = 0,
+                   breaks             = IntMap.empty,
+                   tickarrays         = emptyModuleEnv,
+                   ghci_commands      = availableCommands config,
+                   ghci_macros        = [],
+                   last_command       = Nothing,
+                   cmd_wrapper        = (cmdSuccess =<<),
+                   cmdqueue           = [],
+                   remembered_ctx     = [],
+                   transient_ctx      = [],
+                   extra_imports      = [],
+                   prelude_imports    = [prelude_import],
+                   ghc_e              = isJust maybe_exprs,
+                   short_help         = shortHelpText config,
+                   long_help          = fullHelpText config,
+                   lastErrorLocations = lastErrLocationsRef,
+                   mod_infos          = M.empty,
+                   flushStdHandles    = flush,
+                   noBuffering        = nobuffering,
+                   ifaceCache = empty_cache
+                 }
+
+   return ()
+
+{-
+Note [Changing language extensions for interactive evaluation]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+GHCi maintains two sets of options:
+
+- The "loading options" apply when loading modules
+- The "interactive options" apply when evaluating expressions and commands
+    typed at the GHCi prompt.
+
+The loading options are mostly created in ghc/Main.hs:main' from the command
+line flags. In the function ghc/GHCi/UI.hs:interactiveUI the loading options
+are copied to the interactive options.
+
+These interactive options (but not the loading options!) are supplemented
+unconditionally by setting ExtendedDefaultRules ON and
+MonomorphismRestriction OFF. The unconditional setting of these options
+eventually overwrite settings already specified at the command line.
+
+Therefore instead of unconditionally setting ExtendedDefaultRules and
+NoMonomorphismRestriction for the interactive options, we use the function
+'xopt_set_unlessExplSpec' to first check whether the extension has already
+specified at the command line.
+
+The ghci config file has not yet been processed.
+-}
+
+resetLastErrorLocations :: GhciMonad m => m ()
+resetLastErrorLocations = do
+    st <- getGHCiState
+    liftIO $ writeIORef (lastErrorLocations st) []
+
+ghciLogAction :: IORef [(FastString, Int)] -> LogAction -> LogAction
+ghciLogAction lastErrLocations old_log_action
+              dflags msg_class srcSpan msg = do
+    old_log_action dflags msg_class srcSpan msg
+    case msg_class of
+        MCDiagnostic SevError _reason _code -> case srcSpan of
+            RealSrcSpan rsp _ -> modifyIORef lastErrLocations
+                (++ [(srcLocFile (realSrcSpanStart rsp), srcLocLine (realSrcSpanStart rsp))])
+            _ -> return ()
+        _ -> return ()
+
+-- | Takes a file name and prefixes it with the appropriate
+-- GHC appdir.
+-- Uses ~/.ghc (getAppUserDataDirectory) if it exists
+-- If it doesn't, then it uses $XDG_DATA_HOME/ghc
+-- Earlier we always used to use ~/.ghc, but we want
+-- to gradually move to $XDG_DATA_HOME to respect the XDG specification
+--
+-- As a migration strategy, we will only create new directories in
+-- the appropriate XDG location. However, we will use the old directory
+-- if it already exists.
+getAppDataFile :: FilePath -> IO (Maybe FilePath)
+getAppDataFile file = do
+    let new_path = tryIO (getXdgDirectory XdgConfig "clash") >>= \case
+          Left _ -> pure Nothing
+          Right dir -> flip catchIO (const $ return Nothing) $ do
+            createDirectoryIfMissing False dir
+            pure $ Just $ dir </> file
+
+    e_old_path <- tryIO (getAppUserDataDirectory "clash")
+    case e_old_path of
+      Right old_path -> doesDirectoryExist old_path >>= \case
+        True -> pure $ Just $ old_path </> file
+        False -> new_path
+      Left _ -> new_path
+
+runGHCi :: [(FilePath, Maybe UnitId, Maybe Phase)] -> Maybe [String] -> GHCi ()
+runGHCi paths maybe_exprs = do
+  dflags <- getDynFlags
+  let
+   ignore_dot_ghci = gopt Opt_IgnoreDotGhci dflags
+
+   app_user_dir = liftIO $ getAppDataFile "clashi.conf"
+
+   home_dir = do
+    either_dir <- liftIO $ tryIO (getEnv "HOME")
+    case either_dir of
+      Right home -> return (Just (home </> ".clashi"))
+      _ -> return Nothing
+
+   canonicalizePath' :: FilePath -> IO (Maybe FilePath)
+   canonicalizePath' fp = liftM Just (canonicalizePath fp)
+                `catchIO` \_ -> return Nothing
+
+   sourceConfigFile :: FilePath -> GHCi ()
+   sourceConfigFile file = do
+     exists <- liftIO $ doesFileExist file
+     when exists $ do
+       either_hdl <- liftIO $ tryIO (openFile file ReadMode)
+       case either_hdl of
+         Left _e   -> return ()
+         -- NOTE: this assumes that runInputT won't affect the terminal;
+         -- can we assume this will always be the case?
+         -- This would be a good place for runFileInputT.
+         Right hdl ->
+             do runInputTWithPrefs defaultPrefs defaultSettings $
+                          runCommands $ fileLoop hdl
+                liftIO (hClose hdl `catchIO` \_ -> return ())
+                -- Don't print a message if this is really ghc -e (#11478).
+                -- Also, let the user silence the message with -v0
+                -- (the default verbosity in GHCi is 1).
+                when (isNothing maybe_exprs && verbosity dflags > 0) $
+                  liftIO $ putStrLn ("Loaded Clashi configuration from " ++ file)
+
+  --
+
+  setGHCContextFromGHCiState
+
+  processedCfgs <- if ignore_dot_ghci
+    then pure []
+    else do
+      userCfgs <- do
+        paths <- catMaybes <$> sequence [ app_user_dir, home_dir ]
+        checkedPaths <- liftIO $ filterM checkFileAndDirPerms paths
+        liftIO . fmap (nub . catMaybes) $ mapM canonicalizePath' checkedPaths
+
+      localCfg <- do
+        let path = ".clashi"
+        ok <- liftIO $ checkFileAndDirPerms path
+        if ok then liftIO $ canonicalizePath' path else pure Nothing
+
+      mapM_ sourceConfigFile userCfgs
+        -- Process the global and user .ghci
+        -- (but not $CWD/.ghci or CLI args, yet)
+
+      behaviour <- localConfig <$> getGHCiState
+
+      processedLocalCfg <- case localCfg of
+        Just path | path `notElem` userCfgs ->
+          -- don't read .ghci twice if CWD is $HOME
+          case behaviour of
+            SourceLocalConfig -> localCfg <$ sourceConfigFile path
+            IgnoreLocalConfig -> pure Nothing
+        _ -> pure Nothing
+
+      pure $ maybe id (:) processedLocalCfg userCfgs
+
+  let arg_cfgs = reverse $ ghciScripts dflags
+    -- -ghci-script are collected in reverse order
+    -- We don't require that a script explicitly added by -ghci-script
+    -- is owned by the current user. (#6017)
+
+  mapM_ sourceConfigFile $ nub arg_cfgs \\ processedCfgs
+    -- Dedup, and remove any configs we already processed.
+    -- Importantly, if $PWD/.ghci was ignored due to configuration,
+    -- explicitly specifying it does cause it to be processed.
+
+  -- Perform a :reload for files given on the GHCi command line
+  -- The appropriate targets will already be set
+  -- When in -e mode, if the load fails then we want to stop
+  -- immediately rather than going on to evaluate the expression.
+  when (not (null paths)) $ do
+     ok <- ghciHandle (\e -> do showException e; return Failed) $
+                    loadModule paths
+     when (isJust maybe_exprs && failed ok) $
+        liftIO (exitWith (ExitFailure 1))
+
+  installInteractivePrint (interactivePrint dflags) (isJust maybe_exprs)
+
+  -- if verbosity is greater than 0, or we are connected to a
+  -- terminal, display the prompt in the interactive loop.
+  is_tty <- liftIO (hIsTerminalDevice stdin)
+  let show_prompt = verbosity dflags > 0 || is_tty
+
+  -- reset line number
+  modifyGHCiState $ \st -> st{line_number=0}
+
+  case maybe_exprs of
+        Nothing ->
+          do
+            -- Set different defaulting rules (See #280)
+            runGHCiExpressions
+              ["default ((), [], Prelude.Integer, Prelude.Int, Prelude.Double, Prelude.String)"]
+
+            -- enter the interactive loop
+            runGHCiInput $ runCommands $ nextInputLine show_prompt is_tty
+        Just exprs -> do
+            -- just evaluate the expression we were given
+            runGHCiExpressions exprs
+
+  -- and finally, exit
+  liftIO $ when (verbosity dflags > 0) $ putStrLn "Leaving Clashi."
+
+runGHCiExpressions :: [String] -> GHCi ()
+runGHCiExpressions exprs = do
+            enqueueCommands exprs
+            let hdle e = do st <- getGHCiState
+                            -- flush the interpreter's stdout/stderr on exit (#3890)
+                            flushInterpBuffers
+                            -- Jump through some hoops to get the
+                            -- current progname in the exception text:
+                            -- <progname>: <exception>
+                            liftIO $ withProgName (progname st)
+                                   $ topHandler e
+                                   -- this used to be topHandlerFastExit, see #2228
+            runInputTWithPrefs defaultPrefs defaultSettings $ do
+                -- make `ghc -e` exit nonzero on failure, see #7962, #9916, #17560, #18441
+                _ <- runCommands' hdle
+                     (Just $ hdle (toException $ ExitFailure 1) >> return ())
+                     (return Nothing)
+                return ()
+
+runGHCiInput :: InputT GHCi a -> GHCi a
+runGHCiInput f = do
+    dflags <- getDynFlags
+    let ghciHistory = gopt Opt_GhciHistory dflags
+    let localGhciHistory = gopt Opt_LocalGhciHistory dflags
+    currentDirectory <- liftIO $ getCurrentDirectory
+
+    histFile <- case (ghciHistory, localGhciHistory) of
+      (True, True) -> return (Just (currentDirectory </> ".clashi_history"))
+      (True, _) -> liftIO $ getAppDataFile "clashi_history"
+      _ -> return Nothing
+
+    runInputT
+        (setComplete ghciCompleteWord $ defaultSettings {historyFile = histFile})
+        f
+
+-- | How to get the next input line from the user
+nextInputLine :: Bool -> Bool -> InputT GHCi (Maybe String)
+nextInputLine show_prompt is_tty
+  | is_tty = do
+    prmpt <- if show_prompt then lift mkPrompt else return ""
+    r <- getInputLine prmpt
+    incrementLineNo
+    return r
+  | otherwise = do
+    when show_prompt $ lift mkPrompt >>= liftIO . putStr
+    fileLoop stdin
+
+-- NOTE: We only read .ghci files if they are owned by the current user,
+-- and aren't world writable (files owned by root are ok, see #9324).
+-- Otherwise, we could be accidentally running code planted by
+-- a malicious third party.
+
+-- Furthermore, We only read ./.ghci if . is owned by the current user
+-- and isn't writable by anyone else.  I think this is sufficient: we
+-- don't need to check .. and ../.. etc. because "."  always refers to
+-- the same directory while a process is running.
+
+checkFileAndDirPerms :: FilePath -> IO Bool
+checkFileAndDirPerms file = do
+  file_ok <- checkPerms file
+  -- Do not check dir perms when .ghci doesn't exist, otherwise GHCi will
+  -- print some confusing and useless warnings in some cases (e.g. in
+  -- travis). Note that we can't add a test for this, as all ghci tests should
+  -- run with -ignore-dot-ghci, which means we never get here.
+  if file_ok then checkPerms (getDirectory file) else return False
+  where
+  getDirectory f = case takeDirectory f of
+    "" -> "."
+    d -> d
+
+checkPerms :: FilePath -> IO Bool
+#if defined(mingw32_HOST_OS)
+checkPerms _ = return True
+#else
+checkPerms file =
+  handleIO (\_ -> return False) $ do
+    st <- getFileStatus file
+    me <- getRealUserID
+    let mode = System.Posix.fileMode st
+        ok = (fileOwner st == me || fileOwner st == 0) &&
+             groupWriteMode /= mode `intersectFileModes` groupWriteMode &&
+             otherWriteMode /= mode `intersectFileModes` otherWriteMode
+    unless ok $
+      -- #8248: Improving warning to include a possible fix.
+      putStrLn $ "*** WARNING: " ++ file ++
+                 " is writable by someone else, IGNORING!" ++
+                 "\nSuggested fix: execute 'chmod go-w " ++ file ++ "'"
+    return ok
+#endif
+
+incrementLineNo :: GhciMonad m => m ()
+incrementLineNo = modifyGHCiState incLineNo
+  where
+    incLineNo st = st { line_number = line_number st + 1 }
+
+fileLoop :: GhciMonad m => Handle -> m (Maybe String)
+fileLoop hdl = do
+   l <- liftIO $ tryIO $ hGetLine hdl
+   case l of
+        Left e | isEOFError e              -> return Nothing
+               | -- as we share stdin with the program, the program
+                 -- might have already closed it, so we might get a
+                 -- handle-closed exception. We therefore catch that
+                 -- too.
+                 isIllegalOperation e      -> return Nothing
+               | InvalidArgument <- etype  -> return Nothing
+               | otherwise                 -> liftIO $ ioError e
+                where etype = ioeGetErrorType e
+                -- treat InvalidArgument in the same way as EOF:
+                -- this can happen if the user closed stdin, or
+                -- perhaps did getContents which closes stdin at
+                -- EOF.
+        Right l' -> do
+           incrementLineNo
+           return (Just l')
+
+formatCurrentTime :: String -> IO String
+formatCurrentTime format =
+  getZonedTime >>= return . (formatTime defaultTimeLocale format)
+
+getUserName :: IO String
+getUserName = do
+#if defined(mingw32_HOST_OS)
+  getEnv "USERNAME"
+    `catchIO` \e -> do
+      putStrLn $ show e
+      return ""
+#else
+  getLoginName
+#endif
+
+getInfoForPrompt :: GhciMonad m => m (SDoc, [String], Int)
+getInfoForPrompt = do
+  st <- getGHCiState
+  imports <- GHC.getContext
+  resumes <- GHC.getResumeContext
+
+  context_bit <-
+        case resumes of
+            [] -> return empty
+            r:_ -> do
+                let ix = GHC.resumeHistoryIx r
+                if ix == 0
+                   then return (brackets (ppr (GHC.resumeSpan r)) <> space)
+                   else do
+                        let hist = GHC.resumeHistory r !! (ix-1)
+                        pan <- GHC.getHistorySpan hist
+                        return (brackets (ppr (negate ix) <> char ':'
+                                          <+> ppr pan) <> space)
+
+  let
+        dots | _:rs <- resumes, not (null rs) = text "... "
+             | otherwise = empty
+
+        rev_imports = reverse imports -- rightmost are the most recent
+
+        myIdeclName d | Just m <- ideclAs d = unLoc m
+                      | otherwise           = unLoc (ideclName d)
+
+        modules_names =
+             ['*':(moduleNameString m) | IIModule m <- rev_imports] ++
+             [moduleNameString (myIdeclName d) | IIDecl d <- rev_imports]
+        line = 1 + line_number st
+
+  return (dots <> context_bit, modules_names, line)
+
+-- | Takes a string, presumably following "%call", and tries to parse
+-- a command and arguments in parentheses:
+--
+-- > parseCallEscape "  (cmd arg1 arg2)rest" = Just ("cmd" :| ["arg1", "arg2"], "rest")
+-- > parseCallEscape "( )rest" = Nothing
+--
+parseCallEscape :: String -> Maybe (NE.NonEmpty String, String)
+parseCallEscape s = case dropWhile isSpace s of
+  '(' : sinceOpen -> case span (/= ')') sinceOpen of
+    (call, ')' : sinceClosed)
+      | cmd : args <- words call -> Just (cmd NE.:| args, sinceClosed)
+    _ -> Nothing
+  _ -> Nothing
+
+checkPromptStringForErrors :: String -> Maybe String
+checkPromptStringForErrors ('%':'c':'a':'l':'l':xs) =
+  case parseCallEscape xs of
+    Nothing  -> Just ("Incorrect %call syntax. " ++
+                      "Should be %call(a command and arguments).")
+    Just (_, afterClosed) -> checkPromptStringForErrors afterClosed
+checkPromptStringForErrors ('%':'%':xs) = checkPromptStringForErrors xs
+checkPromptStringForErrors (_:xs) = checkPromptStringForErrors xs
+checkPromptStringForErrors "" = Nothing
+
+generatePromptFunctionFromString :: String -> PromptFunction
+generatePromptFunctionFromString promptS modules_names line =
+        processString promptS
+  where
+        processString :: String -> GHCi SDoc
+        processString ('%':'s':xs) =
+            liftM2 (<>) (return modules_list) (processString xs)
+            where
+              modules_list = hsep . map text . ordNub $ modules_names
+        processString ('%':'l':xs) =
+            liftM2 (<>) (return $ ppr line) (processString xs)
+        processString ('%':'d':xs) =
+            liftM2 (<>) (liftM text formatted_time) (processString xs)
+            where
+              formatted_time = liftIO $ formatCurrentTime "%a %b %d"
+        processString ('%':'t':xs) =
+            liftM2 (<>) (liftM text formatted_time) (processString xs)
+            where
+              formatted_time = liftIO $ formatCurrentTime "%H:%M:%S"
+        processString ('%':'T':xs) = do
+            liftM2 (<>) (liftM text formatted_time) (processString xs)
+            where
+              formatted_time = liftIO $ formatCurrentTime "%I:%M:%S"
+        processString ('%':'@':xs) = do
+            liftM2 (<>) (liftM text formatted_time) (processString xs)
+            where
+              formatted_time = liftIO $ formatCurrentTime "%I:%M %P"
+        processString ('%':'A':xs) = do
+            liftM2 (<>) (liftM text formatted_time) (processString xs)
+            where
+              formatted_time = liftIO $ formatCurrentTime "%H:%M"
+        processString ('%':'u':xs) =
+            liftM2 (<>) (liftM text user_name) (processString xs)
+            where
+              user_name = liftIO $ getUserName
+        processString ('%':'w':xs) =
+            liftM2 (<>) (liftM text current_directory) (processString xs)
+            where
+              current_directory = liftIO $ getCurrentDirectory
+        processString ('%':'o':xs) =
+            liftM ((text os) <>) (processString xs)
+        processString ('%':'a':xs) =
+            liftM ((text arch) <>) (processString xs)
+        processString ('%':'N':xs) =
+            liftM ((text compilerName) <>) (processString xs)
+        processString ('%':'V':xs) =
+            liftM ((text $ showVersion compilerVersion) <>) (processString xs)
+        processString ('%':'c':'a':'l':'l':xs) = do
+            -- Input has just been validated by parseCallEscape
+            let (cmd NE.:| args, afterClosed) = fromJust $ parseCallEscape xs
+            respond <- liftIO $ do
+                (code, out, err) <-
+                    readProcessWithExitCode
+                    cmd args ""
+                    `catchIO` \e -> return (ExitFailure 1, "", show e)
+                case code of
+                    ExitSuccess -> return out
+                    _ -> do
+                        hPutStrLn stderr err
+                        return ""
+            liftM ((text respond) <>) (processString afterClosed)
+        processString ('%':'%':xs) =
+            liftM ((char '%') <>) (processString xs)
+        processString (x:xs) =
+            liftM (char x <>) (processString xs)
+        processString "" =
+            return empty
+
+mkPrompt :: GHCi String
+mkPrompt = do
+  st <- getGHCiState
+  dflags <- getDynFlags
+  (context, modules_names, line) <- getInfoForPrompt
+
+  prompt_string <- (prompt st) modules_names line
+  let prompt_doc = context <> prompt_string
+
+  return (showSDoc dflags prompt_doc)
+
+queryQueue :: GhciMonad m => m (Maybe String)
+queryQueue = do
+  st <- getGHCiState
+  case cmdqueue st of
+    []   -> return Nothing
+    c:cs -> do setGHCiState st{ cmdqueue = cs }
+               return (Just c)
+
+-- Reconfigurable pretty-printing Ticket #5461
+installInteractivePrint :: GhciMonad m => Maybe String -> Bool -> m ()
+installInteractivePrint Nothing _  = return ()
+installInteractivePrint (Just ipFun) exprmode = do
+  ok <- trySuccess $ do
+                name NE.:| _ <- GHC.parseName ipFun
+                modifySession (\he -> let new_ic = setInteractivePrintName (hsc_IC he) name
+                                      in he{hsc_IC = new_ic})
+                return Succeeded
+
+  when (failed ok && exprmode) $ liftIO (exitWith (ExitFailure 1))
+
+-- | The main read-eval-print loop
+runCommands :: InputT GHCi (Maybe String) -> InputT GHCi ()
+runCommands gCmd = runCommands' handler Nothing gCmd >> return ()
+
+runCommands' :: (SomeException -> GHCi Bool) -- ^ Exception handler
+             -> Maybe (GHCi ()) -- ^ Source error handler
+             -> InputT GHCi (Maybe String)
+             -> InputT GHCi ()
+runCommands' eh sourceErrorHandler gCmd = mask $ \unmask -> do
+    b <- handle (\e -> case fromException e of
+                          Just UserInterrupt -> return $ Just False
+                          _ -> case fromException e of
+                                 Just ghce ->
+                                   do liftIO (print (ghce :: GhcException))
+                                      return Nothing
+                                 _other ->
+                                   liftIO (Exception.throwIO e))
+            (unmask $ runOneCommand eh gCmd)
+    case b of
+      Nothing -> return ()
+      Just success -> do
+        unless success $ maybe (return ()) lift sourceErrorHandler
+        unmask $ runCommands' eh sourceErrorHandler gCmd
+
+-- | Evaluate a single line of user input (either :<command> or Haskell code).
+-- A result of Nothing means there was no more input to process.
+-- Otherwise the result is Just b where b is True if the command succeeded;
+-- this is relevant only to ghc -e, which will exit with status 1
+-- if the command was unsuccessful. GHCi will continue in either case.
+-- TODO: replace Bool with CmdExecOutcome
+runOneCommand :: (SomeException -> GHCi Bool) -> InputT GHCi (Maybe String)
+            -> InputT GHCi (Maybe Bool)
+runOneCommand eh gCmd = do
+  -- run a previously queued command if there is one, otherwise get new
+  -- input from user
+  mb_cmd0 <- noSpace (lift queryQueue)
+  mb_cmd1 <- maybe (noSpace gCmd) (return . Just) mb_cmd0
+  case mb_cmd1 of
+    Nothing -> return Nothing
+    Just c  -> do
+      st <- getGHCiState
+      ghciHandle (\e -> lift $ eh e >>= return . Just) $
+        handleSourceError printErrorAndFail $
+          cmd_wrapper st $ doCommand c
+               -- source error's are handled by runStmt
+               -- is the handler necessary here?
+  where
+    printErrorAndFail err = do
+        printGhciException err
+        return $ Just False     -- Exit ghc -e, but not GHCi
+
+    noSpace q = q >>= maybe (return Nothing)
+                            (\c -> case removeSpaces c of
+                                     ""   -> noSpace q
+                                     ":{" -> multiLineCmd q
+                                     _    -> return (Just c) )
+    multiLineCmd q = do
+      st <- getGHCiState
+      let p = prompt st
+      setGHCiState st{ prompt = prompt_cont st }
+      mb_cmd <- collectCommand q "" `MC.finally`
+                modifyGHCiState (\st' -> st' { prompt = p })
+      return mb_cmd
+    -- we can't use removeSpaces for the sublines here, so
+    -- multiline commands are somewhat more brittle against
+    -- fileformat errors (such as \r in dos input on unix),
+    -- we get rid of any extra spaces for the ":}" test;
+    -- we also avoid silent failure if ":}" is not found;
+    -- and since there is no (?) valid occurrence of \r (as
+    -- opposed to its String representation, "\r") inside a
+    -- ghci command, we replace any such with ' ' (argh:-(
+    collectCommand q c = q >>=
+      maybe (liftIO (ioError collectError))
+            (\l->if removeSpaces l == ":}"
+                 then return (Just c)
+                 else collectCommand q (c ++ "\n" ++ map normSpace l))
+      where normSpace '\r' = ' '
+            normSpace   x  = x
+    -- SDM (2007-11-07): is userError the one to use here?
+    collectError = userError "unterminated multiline command :{ .. :}"
+
+    cmdOutcome :: CmdExecOutcome -> Maybe Bool
+    cmdOutcome CleanExit = Nothing
+    cmdOutcome CmdSuccess = Just True
+    cmdOutcome CmdFailure = Just False
+
+    -- | Handle a line of input
+    doCommand :: String -> InputT GHCi CommandResult
+
+    -- command
+    doCommand stmt | stmt'@(':' : cmd) <- removeSpaces stmt = do
+      (stats, result) <- runWithStats (const Nothing) $ specialCommand cmd
+      return $ CommandComplete stmt' (cmdOutcome <$> result) stats
+
+    -- haskell
+    doCommand stmt = do
+      -- if 'stmt' was entered via ':{' it will contain '\n's
+      let stmt_nl_cnt = length [ () | '\n' <- stmt ]
+      ml <- lift $ isOptionSet Multiline
+      if ml && stmt_nl_cnt == 0 -- don't trigger automatic multi-line mode for ':{'-multiline input
+        then do
+          fst_line_num <- line_number <$> getGHCiState
+          mb_stmt <- checkInputForLayout stmt gCmd
+          case mb_stmt of
+            Nothing -> return CommandIncomplete
+            Just ml_stmt -> do
+              -- temporarily compensate line-number for multi-line input
+              (stats, result) <- runAndPrintStats runAllocs $ lift $
+                runStmtWithLineNum fst_line_num ml_stmt GHC.RunToCompletion
+              return $
+                CommandComplete ml_stmt (Just . runSuccess <$> result) stats
+        else do -- single line input and :{ - multiline input
+          last_line_num <- line_number <$> getGHCiState
+          -- reconstruct first line num from last line num and stmt
+          let fst_line_num | stmt_nl_cnt > 0 = last_line_num - (stmt_nl_cnt2 + 1)
+                           | otherwise = last_line_num -- single line input
+              stmt_nl_cnt2 = length [ () | '\n' <- stmt' ]
+              stmt' = dropLeadingWhiteLines stmt -- runStmt doesn't like leading empty lines
+          -- temporarily compensate line-number for multi-line input
+          (stats, result) <- runAndPrintStats runAllocs $ lift $
+            runStmtWithLineNum fst_line_num stmt' GHC.RunToCompletion
+          return $ CommandComplete stmt' (Just . runSuccess <$> result) stats
+
+    -- runStmt wrapper for temporarily overridden line-number
+    runStmtWithLineNum :: Int -> String -> SingleStep
+                       -> GHCi (Maybe GHC.ExecResult)
+    runStmtWithLineNum lnum stmt step = do
+        st0 <- getGHCiState
+        setGHCiState st0 { line_number = lnum }
+        result <- runStmt stmt step
+        -- restore original line_number
+        getGHCiState >>= \st -> setGHCiState st { line_number = line_number st0 }
+        return result
+
+    -- note: this is subtly different from 'unlines . dropWhile (all isSpace) . lines'
+    dropLeadingWhiteLines s | (l0,'\n':r) <- break (=='\n') s
+                            , all isSpace l0 = dropLeadingWhiteLines r
+                            | otherwise = s
+
+
+-- #4316
+-- lex the input.  If there is an unclosed layout context, request input
+checkInputForLayout
+  :: GhciMonad m => String -> m (Maybe String) -> m (Maybe String)
+checkInputForLayout stmt getStmt = do
+   dflags' <- getDynFlags
+   let dflags = xopt_set dflags' LangExt.AlternativeLayoutRule
+   st0 <- getGHCiState
+   let buf'   =  stringToStringBuffer stmt
+       loc    = mkRealSrcLoc (fsLit (progname st0)) (line_number st0) 1
+       pstate = Lexer.initParserState (initParserOpts dflags) buf' loc
+   case Lexer.unP goToEnd pstate of
+     (Lexer.POk _ False) -> return $ Just stmt
+     _other              -> do
+       st1 <- getGHCiState
+       let p = prompt st1
+       setGHCiState st1{ prompt = prompt_cont st1 }
+       mb_stmt <- ghciHandle (\ex -> case fromException ex of
+                            Just UserInterrupt -> return Nothing
+                            _ -> case fromException ex of
+                                 Just ghce ->
+                                   do liftIO (print (ghce :: GhcException))
+                                      return Nothing
+                                 _other -> liftIO (Exception.throwIO ex))
+                     getStmt
+       modifyGHCiState (\st' -> st' { prompt = p })
+       -- the recursive call does not recycle parser state
+       -- as we use a new string buffer
+       case mb_stmt of
+         Nothing  -> return Nothing
+         Just str -> if str == ""
+           then return $ Just stmt
+           else do
+             checkInputForLayout (stmt++"\n"++str) getStmt
+     where goToEnd = do
+             eof <- Lexer.nextIsEOF
+             if eof
+               then Lexer.activeContext
+               else Lexer.lexer False return >> goToEnd
+
+enqueueCommands :: GhciMonad m => [String] -> m ()
+enqueueCommands cmds = do
+  -- make sure we force any exceptions in the commands while we're
+  -- still inside the exception handler, otherwise bad things will
+  -- happen (see #10501)
+  cmds `deepseq` return ()
+  modifyGHCiState $ \st -> st{ cmdqueue = cmds ++ cmdqueue st }
+
+-- | Entry point to execute some haskell code from user.
+-- The return value True indicates success, as in `runOneCommand`.
+runStmt :: GhciMonad m => String -> SingleStep -> m (Maybe GHC.ExecResult)
+runStmt input step = do
+  pflags <- initParserOpts <$> GHC.getInteractiveDynFlags
+  -- In GHCi, we disable `-fdefer-type-errors`, as well as `-fdefer-type-holes`
+  -- and `-fdefer-out-of-scope-variables` for **naked expressions**. The
+  -- declarations and statements are not affected.
+  -- See Note [Deferred type errors in GHCi] in GHC.Tc.Module
+  st <- getGHCiState
+  let source = progname st
+  let line = line_number st
+
+  -- Add any LANGUAGE/OPTIONS_GHC pragmas we find find.
+  set_pragmas pflags
+
+  if | GHC.isStmt pflags input -> do
+         hsc_env <- GHC.getSession
+         mb_stmt <- liftIO (runInteractiveHsc hsc_env (hscParseStmtWithLocation source line input))
+         case mb_stmt of
+           Nothing ->
+             -- empty statement / comment
+             return (Just exec_complete)
+           Just stmt ->
+             run_stmt stmt
+
+     -- Otherwise assume a declaration (or a list of declarations)
+     -- and/or import(s) (#20473).
+     -- Note: `GHC.isDecl` returns False on input like
+     -- `data Infix a b = a :@: b; infixl 4 :@:`
+     -- and should therefore not be used here.
+     | otherwise -> do
+         hsc_env <- GHC.getSession
+         let !ic = hsc_IC hsc_env  -- Bang-pattern to avoid space leaks
+         setDumpFilePrefix ic
+           -- `-ddump-to-file` must work for normal GHCi compilations /
+           --     evaluations. (#17500)
+         -- Use >>= \case instead of MonadFail desugaring to take into
+         -- consideration `instance XXModule p = DataConCantHappen`.
+         -- Tracked in #15681
+         liftIO (hscParseModuleWithLocation hsc_env source line input) >>= \case
+           HsModule { hsmodDecls = decls, hsmodImports = imports } -> do
+             run_imports imports
+             run_decls decls
+  where
+    exec_complete = GHC.ExecComplete (Right []) 0
+
+    run_imports imports = mapM_ (addImportToContext . unLoc) imports
+
+    set_pragmas pflags =
+      let stringbuf = stringToStringBuffer input
+          (_msgs, loc_opts) = Header.getOptions pflags stringbuf "<interactive>"
+          opts = unLoc <$> loc_opts
+      in setOptions opts
+
+    run_stmt :: GhciMonad m => GhciLStmt GhcPs -> m (Maybe GHC.ExecResult)
+    run_stmt stmt = do
+           m_result <- GhciMonad.runStmt stmt input step
+           case m_result of
+               Nothing     -> return Nothing
+               Just result -> Just <$> afterRunStmt (const True) result
+
+    -- `x = y` (a declaration) should be treated as `let x = y` (a statement).
+    -- The reason is because GHCi wasn't designed to support `x = y`, but then
+    -- b98ff3 (#7253) added support for it, except it did not do a good job and
+    -- caused problems like:
+    --
+    --  - not adding the binders defined this way in the necessary places caused
+    --    `x = y` to not work in some cases (#12091).
+    --  - some GHCi command crashed after `x = y` (#15721)
+    --  - warning generation did not work for `x = y` (#11606)
+    --  - because `x = y` is a declaration (instead of a statement) differences
+    --    in generated code caused confusion (#16089)
+    --
+    -- Instead of dealing with all these problems individually here we fix this
+    -- mess by just treating `x = y` as `let x = y`.
+    run_decls :: GhciMonad m => [LHsDecl GhcPs] -> m (Maybe GHC.ExecResult)
+    -- Only turn `FunBind` and `VarBind` into statements, other bindings
+    -- (e.g. `PatBind`) need to stay as decls.
+    run_decls [L l (ValD _ bind@FunBind{})] = run_stmt (mk_stmt (locA l) bind)
+    run_decls [L l (ValD _ bind@VarBind{})] = run_stmt (mk_stmt (locA l) bind)
+    -- Note that any `x = y` declarations below will be run as declarations
+    -- instead of statements (e.g. `...; x = y; ...`)
+    run_decls decls = do
+      -- In the new IO library, read handles buffer data even if the Handle
+      -- is set to NoBuffering.  This causes problems for GHCi where there
+      -- are really two stdin Handles.  So we flush any bufferred data in
+      -- GHCi's stdin Handle here (only relevant if stdin is attached to
+      -- a file, otherwise the read buffer can't be flushed).
+      _ <- liftIO $ tryIO $ hFlushAll stdin
+      m_result <- GhciMonad.runDecls' decls
+      forM m_result $ \result ->
+        afterRunStmt (const True) (GHC.ExecComplete (Right result) 0)
+
+    mk_stmt :: SrcSpan -> HsBind GhcPs -> GhciLStmt GhcPs
+    mk_stmt loc bind =
+      let
+        la  = L (noAnnSrcSpan loc)
+        la' = L (noAnnSrcSpan loc)
+      in la (LetStmt noAnn (HsValBinds noAnn (ValBinds NoAnnSortKey (unitBag (la' bind)) [])))
+
+    setDumpFilePrefix :: GHC.GhcMonad m => InteractiveContext -> m () -- #17500
+    setDumpFilePrefix ic = do
+        dflags <- GHC.getInteractiveDynFlags
+        GHC.setInteractiveDynFlags dflags { dumpPrefix = modStr ++ "." }
+      where
+        modStr = moduleNameString $ moduleName $ icInteractiveModule $ ic
+
+-- | Clean up the GHCi environment after a statement has run
+afterRunStmt :: GhciMonad m
+             => (SrcSpan -> Bool) -> GHC.ExecResult -> m GHC.ExecResult
+afterRunStmt step_here run_result = do
+  resumes <- GHC.getResumeContext
+  case run_result of
+     GHC.ExecComplete{..} ->
+       case execResult of
+          Left ex -> liftIO $ Exception.throwIO ex
+          Right names -> do
+            show_types <- isOptionSet ShowType
+            when show_types $ printTypeOfNames names
+     GHC.ExecBreak names mb_info
+         | first_resume : _ <- resumes
+         , isNothing  mb_info ||
+           step_here (GHC.resumeSpan first_resume) -> do
+               mb_id_loc <- toBreakIdAndLocation mb_info
+               let bCmd = maybe "" ( \(_,l) -> onBreakCmd l ) mb_id_loc
+               if (null bCmd)
+                 then printStoppedAtBreakInfo first_resume names
+                 else enqueueCommands [bCmd]
+               -- run the command set with ":set stop <cmd>"
+               st <- getGHCiState
+               enqueueCommands [stop st]
+               return ()
+         | otherwise -> resume step_here GHC.SingleStep Nothing >>=
+                        afterRunStmt step_here >> return ()
+
+  flushInterpBuffers
+  withSignalHandlers $ do
+     b <- isOptionSet RevertCAFs
+     when b revertCAFs
+
+  return run_result
+
+runSuccess :: Maybe GHC.ExecResult -> Bool
+runSuccess run_result
+  | Just (GHC.ExecComplete { execResult = Right _ }) <- run_result = True
+  | otherwise = False
+
+runAllocs :: Maybe GHC.ExecResult -> Maybe Integer
+runAllocs m = do
+  res <- m
+  case res of
+    GHC.ExecComplete{..} -> Just (fromIntegral execAllocation)
+    _ -> Nothing
+
+toBreakIdAndLocation :: GhciMonad m
+                     => Maybe GHC.BreakInfo -> m (Maybe (Int, BreakLocation))
+toBreakIdAndLocation Nothing = return Nothing
+toBreakIdAndLocation (Just inf) = do
+  let md = GHC.breakInfo_module inf
+      nm = GHC.breakInfo_number inf
+  st <- getGHCiState
+  return $ listToMaybe [ id_loc | id_loc@(_,loc) <- IntMap.assocs (breaks st),
+                                  breakModule loc == md,
+                                  breakTick loc == nm ]
+
+printStoppedAtBreakInfo :: GHC.GhcMonad m => Resume -> [Name] -> m ()
+printStoppedAtBreakInfo res names = do
+  printForUser $ pprStopped res
+  --  printTypeOfNames session names
+  let namesSorted = sortBy compareNames names
+  tythings <- catMaybes `liftM` mapM GHC.lookupName namesSorted
+  docs <- mapM pprTypeAndContents [i | AnId i <- tythings]
+  printForUserPartWay $ vcat docs
+
+printTypeOfNames :: GHC.GhcMonad m => [Name] -> m ()
+printTypeOfNames names
+ = mapM_ (printTypeOfName ) $ sortBy compareNames names
+
+compareNames :: Name -> Name -> Ordering
+compareNames = on compare getOccString S.<> on SrcLoc.leftmost_smallest getSrcSpan
+
+printTypeOfName :: GHC.GhcMonad m => Name -> m ()
+printTypeOfName n
+   = do maybe_tything <- GHC.lookupName n
+        case maybe_tything of
+            Nothing    -> return ()
+            Just thing -> printTyThing thing
+
+
+data MaybeCommand = GotCommand Command | BadCommand | NoLastCommand
+
+-- | Entry point for execution a ':<command>' input from user
+specialCommand :: String -> InputT GHCi CmdExecOutcome
+specialCommand ('!':str) = lift $ shellEscape (dropWhile isSpace str)
+specialCommand str = do
+  let (cmd,rest) = break isSpace str
+  maybe_cmd <- lookupCommand cmd
+  htxt <- short_help <$> getGHCiState
+  case maybe_cmd of
+    GotCommand cmd -> (cmdAction cmd) (dropWhile isSpace rest)
+    BadCommand ->
+      do liftIO $ hPutStr stderr ("unknown command ':" ++ cmd ++ "'\n"
+                           ++ htxt)
+         return CmdFailure
+    NoLastCommand ->
+      do liftIO $ hPutStr stderr ("there is no last command to perform\n"
+                           ++ htxt)
+         return CmdFailure
+
+shellEscape :: MonadIO m => String -> m CmdExecOutcome
+shellEscape str = liftIO $ do
+  exitCode <- system str
+  case exitCode of
+    ExitSuccess -> return CmdSuccess
+    ExitFailure _ -> return CmdFailure
+
+lookupCommand :: GhciMonad m => String -> m (MaybeCommand)
+lookupCommand "" = do
+  st <- getGHCiState
+  case last_command st of
+      Just c -> return $ GotCommand c
+      Nothing -> return NoLastCommand
+lookupCommand str = do
+  mc <- lookupCommand' str
+  modifyGHCiState (\st -> st { last_command = mc })
+  return $ case mc of
+           Just c -> GotCommand c
+           Nothing -> BadCommand
+
+lookupCommand' :: GhciMonad m => String -> m (Maybe Command)
+lookupCommand' ":" = return Nothing
+lookupCommand' str' = do
+  macros    <- ghci_macros <$> getGHCiState
+  ghci_cmds <- ghci_commands <$> getGHCiState
+
+  let ghci_cmds_nohide = filter (not . cmdHidden) ghci_cmds
+
+  let (str, xcmds) = case str' of
+          ':' : rest -> (rest, [])     -- "::" selects a builtin command
+          _          -> (str', macros) -- otherwise include macros in lookup
+
+      lookupExact  s = find $ (s ==)              . cmdName
+      lookupPrefix s = find $ (s `isPrefixOptOf`) . cmdName
+
+      -- hidden commands can only be matched exact
+      builtinPfxMatch = lookupPrefix str ghci_cmds_nohide
+
+  -- first, look for exact match (while preferring macros); then, look
+  -- for first prefix match (preferring builtins), *unless* a macro
+  -- overrides the builtin; see #8305 for motivation
+  return $ lookupExact str xcmds <|>
+           lookupExact str ghci_cmds <|>
+           (builtinPfxMatch >>= \c -> lookupExact (cmdName c) xcmds) <|>
+           builtinPfxMatch <|>
+           lookupPrefix str xcmds
+
+-- This predicate is for prefix match with a command-body and
+-- suffix match with an option, such as `!`.
+-- The current implementation assumes only the `!` character
+-- as the option delimiter.
+-- See also #17345
+isPrefixOptOf :: String -> String -> Bool
+isPrefixOptOf s x = let (body, opt) = break (== '!') s
+                    in  (body `isPrefixOf` x) && (opt `isSuffixOf` x)
+
+getCurrentBreakSpan :: GHC.GhcMonad m => m (Maybe SrcSpan)
+getCurrentBreakSpan = do
+  resumes <- GHC.getResumeContext
+  case resumes of
+    [] -> return Nothing
+    (r:_) -> do
+        let ix = GHC.resumeHistoryIx r
+        if ix == 0
+           then return (Just (GHC.resumeSpan r))
+           else do
+                let hist = GHC.resumeHistory r !! (ix-1)
+                pan <- GHC.getHistorySpan hist
+                return (Just pan)
+
+getCallStackAtCurrentBreakpoint :: GHC.GhcMonad m => m (Maybe [String])
+getCallStackAtCurrentBreakpoint = do
+  resumes <- GHC.getResumeContext
+  case resumes of
+    [] -> return Nothing
+    (r:_) -> do
+       interp <- hscInterp <$> GHC.getSession
+       Just <$> liftIO (costCentreStackInfo interp (GHC.resumeCCS r))
+
+getCurrentBreakModule :: GHC.GhcMonad m => m (Maybe Module)
+getCurrentBreakModule = do
+  resumes <- GHC.getResumeContext
+  case resumes of
+    [] -> return Nothing
+    (r:_) -> do
+        let ix = GHC.resumeHistoryIx r
+        if ix == 0
+           then return (GHC.breakInfo_module `liftM` GHC.resumeBreakInfo r)
+           else do
+                let hist = GHC.resumeHistory r !! (ix-1)
+                return $ Just $ GHC.getHistoryModule  hist
+
+-----------------------------------------------------------------------------
+--
+-- Commands
+--
+-----------------------------------------------------------------------------
+
+noArgs :: MonadIO m => m () -> String -> m ()
+noArgs m "" = m
+noArgs _ _  = liftIO $ putStrLn "This command takes no arguments"
+
+withSandboxOnly :: GHC.GhcMonad m => String -> m () -> m ()
+withSandboxOnly cmd this = do
+   dflags <- getDynFlags
+   if not (gopt Opt_GhciSandbox dflags)
+      then printForUser (text cmd <+>
+                         text "is not supported with -fno-ghci-sandbox")
+      else this
+
+-----------------------------------------------------------------------------
+-- :help
+
+help :: GhciMonad m => String -> m ()
+help _ = do
+    txt <- long_help `fmap` getGHCiState
+    liftIO $ putStr txt
+
+-----------------------------------------------------------------------------
+-- :info
+
+info :: GHC.GhcMonad m => Bool -> String -> m ()
+info _ "" = throwGhcException (CmdLineError "syntax: ':i <thing-you-want-info-about>'")
+info allInfo s  = handleSourceError printGhciException $ do
+    forM_ (words s) $ \thing -> do
+      sdoc <- infoThing allInfo thing
+      rendered <- showSDocForUser' sdoc
+      liftIO (putStrLn rendered)
+
+infoThing :: GHC.GhcMonad m => Bool -> String -> m SDoc
+infoThing allInfo str = do
+    names     <- GHC.parseName str
+    mb_stuffs <- mapM (GHC.getInfo allInfo) names
+    let filtered = filterOutChildren (\(t,_f,_ci,_fi,_sd) -> t)
+                                     (catMaybes (NE.toList mb_stuffs))
+    return $ vcat (intersperse (text "") $ map pprInfo filtered)
+
+  -- Filter out names whose parent is also there. Good
+  -- example is '[]', which is both a type and data
+  -- constructor in the same type
+filterOutChildren :: (a -> TyThing) -> [a] -> [a]
+filterOutChildren get_thing xs
+  = filterOut has_parent xs
+  where
+    all_names = mkNameSet (map (getName . get_thing) xs)
+    has_parent x = case tyThingParent_maybe (get_thing x) of
+                     Just p  -> getName p `elemNameSet` all_names
+                     Nothing -> False
+
+pprInfo :: (TyThing, Fixity, [GHC.ClsInst], [GHC.FamInst], SDoc) -> SDoc
+pprInfo (thing, fixity, cls_insts, fam_insts, docs)
+  =  docs
+  $$ pprTyThingInContextLoc thing
+  $$ showFixity thing fixity
+  $$ vcat (map GHC.pprInstance cls_insts)
+  $$ vcat (map GHC.pprFamInst  fam_insts)
+
+-----------------------------------------------------------------------------
+-- :main
+
+runMain :: GhciMonad m => String -> m ()
+runMain s = case toArgsNoLoc s of
+              Left err   -> liftIO (hPutStrLn stderr err)
+              Right args -> doWithMain (doWithArgs args)
+  where
+    doWithMain fun = do
+      dflags  <- getDynFlags
+      let main = fromMaybe "main" (mainFunIs dflags)
+      handleSourceError printErrAndMaybeExit $ do
+        -- doing this will prevent the main to run when it is not in scope
+        -- this might seem useless, but it doesn't suggest other functions
+        -- to be used, which is exactly what we want here. See #23996.
+        _ <- GHC.parseName main
+
+        -- Wrap the main function in 'void' to discard its value instead
+        -- of printing it (#9086). See Haskell 2010 report Chapter 5.
+        fun $ "Control.Monad.void (" ++ main ++ ")"
+
+
+
+
+-----------------------------------------------------------------------------
+-- :run
+
+runRun :: GhciMonad m => String -> m ()
+runRun s = case toCmdArgs s of
+           Left err          -> liftIO (hPutStrLn stderr err)
+           Right (cmd, args) -> doWithArgs args cmd
+
+doWithArgs :: GhciMonad m => [String] -> String -> m ()
+doWithArgs args cmd = enqueueCommands ["System.Environment.withArgs " ++
+                                       show args ++ " (" ++ cmd ++ ")"]
+
+{-
+Akin to @Prelude.words@, but acts like the Bourne shell, treating
+quoted strings as Haskell Strings, and also parses Haskell [String]
+syntax.
+-}
+
+getCmd :: String -> Either String             -- Error
+                           (String, String) -- (Cmd, Rest)
+getCmd s = case break isSpace $ dropWhile isSpace s of
+           ([], _) -> Left ("Couldn't find command in " ++ show s)
+           res -> Right res
+
+toCmdArgs :: String -> Either String             -- Error
+                              (String, [String]) -- (Cmd, Args)
+toCmdArgs s = case getCmd s of
+              Left err -> Left err
+              Right (cmd, s') -> case toArgsNoLoc s' of
+                                 Left err -> Left err
+                                 Right args -> Right (cmd, args)
+
+-- wrapper around GHC.Parser.Header.toArgs, but without locations
+toArgsNoLoc :: String -> Either String [String]
+toArgsNoLoc str = map unLoc <$> toArgs fake_loc str
+  where
+    fake_loc = mkRealSrcLoc (fsLit "<interactive>") 1 1
+    -- this should never be seen, because it's discarded with the `map unLoc`
+
+-----------------------------------------------------------------------------
+-- :cd
+
+changeDirectory :: GhciMonad m => String -> m ()
+changeDirectory "" = do
+  -- :cd on its own changes to the user's home directory
+  either_dir <- liftIO $ tryIO getHomeDirectory
+  case either_dir of
+     Left _e -> return ()
+     Right dir -> changeDirectory dir
+changeDirectory dir = do
+  graph <- GHC.getModuleGraph
+  when (not (null $ GHC.mgModSummaries graph)) $
+        liftIO $ putStrLn "Warning: changing directory causes all loaded modules to be unloaded,\nbecause the search path has changed."
+  -- delete defined breakpoints and clear the interface file cache (#1620)
+  clearCaches
+  setContextAfterLoad False Nothing
+  GHC.workingDirectoryChanged
+  dir' <- expandPath dir
+  liftIO $ setCurrentDirectory dir'
+  -- With -fexternal-interpreter, we have to change the directory of the subprocess too.
+  -- (this gives consistent behaviour with and without -fexternal-interpreter)
+  interp <- hscInterp <$> GHC.getSession
+  case interpInstance interp of
+    ExternalInterp {} -> do
+      fhv <- compileGHCiExpr $
+        "System.Directory.setCurrentDirectory " ++ show dir'
+      liftIO $ evalIO interp fhv
+    _ -> pure ()
+
+trySuccess :: GhciMonad m => m SuccessFlag -> m SuccessFlag
+trySuccess act =
+    handleSourceError (\e -> do printErrAndMaybeExit e -- immediately exit fith failure if in ghc -e
+                                pure Failed) act
+
+-----------------------------------------------------------------------------
+-- :edit
+
+editFile :: GhciMonad m => String -> m ()
+editFile str =
+  do file <- if null str then chooseEditFile else expandPath str
+     st <- getGHCiState
+     errs <- liftIO $ readIORef $ lastErrorLocations st
+     let cmd = editor st
+     when (null cmd)
+       $ throwGhcException (CmdLineError "editor not set, use :set editor")
+     lineOpt <- liftIO $ do
+         let sameFile p1 p2 = liftA2 (==) (canonicalizePath p1) (canonicalizePath p2)
+              `catchIO` (\_ -> return False)
+
+         curFileErrs <- filterM (\(f, _) -> unpackFS f `sameFile` file) errs
+         return $ case curFileErrs of
+             (_, line):_ -> " +" ++ show line
+             _ -> ""
+     let cmdArgs = ' ':(file ++ lineOpt)
+     code <- liftIO $ system (cmd ++ cmdArgs)
+
+     when (code == ExitSuccess)
+       $ reloadModule ""
+
+-- The user didn't specify a file so we pick one for them.
+-- Our strategy is to pick the first module that failed to load,
+-- or otherwise the first target.
+--
+-- XXX: Can we figure out what happened if the dependency analysis fails
+--      (e.g., because the porgrammeer mistyped the name of a module)?
+-- XXX: Can we figure out the location of an error to pass to the editor?
+-- XXX: if we could figure out the list of errors that occurred during the
+-- last load/reaload, then we could start the editor focused on the first
+-- of those.
+chooseEditFile :: GHC.GhcMonad m => m String
+chooseEditFile =
+  do let hasFailed (GHC.ModuleNode _deps x) = fmap not $ isLoadedModSummary x
+         hasFailed _ = return False
+
+     graph <- GHC.getModuleGraph
+     failed_graph <-
+       GHC.mkModuleGraph <$> filterM hasFailed (GHC.mgModSummaries' graph)
+     let order g  = flattenSCCs $ filterToposortToModules $
+           GHC.topSortModuleGraph True g Nothing
+         pick xs  = case xs of
+                      x : _ -> GHC.ml_hs_file (GHC.ms_location x)
+                      _     -> Nothing
+
+     case pick (order failed_graph) of
+       Just file -> return file
+       Nothing   ->
+         do targets <- GHC.getTargets
+            case msum (map fromTarget targets) of
+              Just file -> return file
+              Nothing   -> throwGhcException (CmdLineError "No files to edit.")
+
+  where fromTarget GHC.Target { targetId = GHC.TargetFile f _ } = Just f
+        fromTarget _ = Nothing -- when would we get a module target?
+
+
+-----------------------------------------------------------------------------
+-- :def
+
+defineMacro :: GhciMonad m => Bool{-overwrite-} -> String -> m ()
+defineMacro _ (':':_) = (liftIO $ hPutStrLn stderr
+                          "macro name cannot start with a colon")
+                            >> failIfExprEvalMode
+defineMacro _ ('!':_) = (liftIO $ hPutStrLn stderr
+                          "macro name cannot start with an exclamation mark")
+                            >> failIfExprEvalMode
+                          -- little code duplication allows to grep error msg
+defineMacro overwrite s = do
+  let (macro_name, definition) = break isSpace s
+  macros <- ghci_macros <$> getGHCiState
+  let defined = map cmdName macros
+  if null macro_name
+        then if null defined
+                then liftIO $ putStrLn "no macros defined"
+                else liftIO $ putStr ("the following macros are defined:\n" ++
+                                      unlines defined)
+  else do
+    isCommand <- isJust <$> lookupCommand' macro_name
+    let check_newname
+          | macro_name `elem` defined = throwGhcException (CmdLineError
+            ("macro '" ++ macro_name ++ "' is already defined. " ++ hint))
+          | isCommand = throwGhcException (CmdLineError
+            ("macro '" ++ macro_name ++ "' overwrites builtin command. " ++ hint))
+          | otherwise = return ()
+        hint = " Use ':def!' to overwrite."
+
+    unless overwrite check_newname
+    -- compile the expression
+    handleSourceError printErrAndMaybeExit $ do
+      step <- getGhciStepIO
+      expr <- GHC.parseExpr definition
+      -- > ghciStepIO . definition :: String -> IO String
+      let stringTy :: LHsType GhcPs
+          stringTy = nlHsTyVar NotPromoted stringTyCon_RDR
+          ioM :: LHsType GhcPs -- AZ
+          ioM = nlHsTyVar NotPromoted (getRdrName ioTyConName) `nlHsAppTy` stringTy
+          body = nlHsVar compose_RDR `mkHsApp` (nlHsPar step)
+                                     `mkHsApp` (nlHsPar expr)
+          tySig = mkHsWildCardBndrs $ noLocA $ mkHsImplicitSigType $
+                  nlHsFunTy stringTy ioM
+          new_expr = L (getLoc expr) $ ExprWithTySig noAnn body tySig
+      hv <- GHC.compileParsedExprRemote new_expr
+
+      let newCmd = Command { cmdName = macro_name
+                           , cmdAction = lift . runMacro hv
+                           , cmdHidden = False
+                           , cmdCompletionFunc = noCompletion
+                           }
+
+      -- later defined macros have precedence
+      modifyGHCiState $ \s ->
+        let filtered = [ cmd | cmd <- macros, cmdName cmd /= macro_name ]
+        in s { ghci_macros = newCmd : filtered }
+
+runMacro
+  :: GhciMonad m
+  => GHC.ForeignHValue  -- String -> IO String
+  -> String
+  -> m CmdExecOutcome
+runMacro fun s = do
+  interp <- hscInterp <$> GHC.getSession
+  str <- liftIO $ evalStringToIOString interp fun s
+  enqueueCommands (lines str)
+  return CmdSuccess
+
+
+-----------------------------------------------------------------------------
+-- :undef
+
+undefineMacro :: GhciMonad m => String -> m ()
+undefineMacro str = mapM_ undef (words str)
+ where undef macro_name = do
+        cmds <- ghci_macros <$> getGHCiState
+        if (macro_name `notElem` map cmdName cmds)
+           then throwGhcException (CmdLineError
+                ("macro '" ++ macro_name ++ "' is not defined"))
+           else do
+            -- This is a tad racy but really, it's a shell
+            modifyGHCiState $ \s ->
+                s { ghci_macros = filter ((/= macro_name) . cmdName)
+                                         (ghci_macros s) }
+
+
+-----------------------------------------------------------------------------
+-- :cmd
+
+cmdCmd :: GhciMonad m => String -> m ()
+cmdCmd str = handleSourceError printErrAndMaybeExit $ do
+    step <- getGhciStepIO
+    expr <- GHC.parseExpr str
+    -- > ghciStepIO str :: IO String
+    let new_expr = step `mkHsApp` expr
+    hv <- GHC.compileParsedExprRemote new_expr
+
+    interp <- hscInterp <$> GHC.getSession
+    cmds <- liftIO $ evalString interp hv
+    enqueueCommands (lines cmds)
+
+-- | Generate a typed ghciStepIO expression
+-- @ghciStepIO :: Ty String -> IO String@.
+getGhciStepIO :: GHC.GhcMonad m => m (LHsExpr GhcPs)
+getGhciStepIO = do
+  ghciTyConName <- GHC.getGHCiMonad
+  let stringTy = nlHsTyVar NotPromoted stringTyCon_RDR
+      ghciM = nlHsTyVar NotPromoted (getRdrName ghciTyConName) `nlHsAppTy` stringTy
+      ioM = nlHsTyVar NotPromoted (getRdrName ioTyConName) `nlHsAppTy` stringTy
+      body = nlHsVar (getRdrName ghciStepIoMName)
+      tySig = mkHsWildCardBndrs $ noLocA $ mkHsImplicitSigType $
+              nlHsFunTy ghciM ioM
+  return $ noLocA $ ExprWithTySig noAnn body tySig
+
+-----------------------------------------------------------------------------
+-- :check
+
+checkModule :: GhciMonad m => String -> m ()
+checkModule m = do
+  let modl = GHC.mkModuleName m
+  ok <- handleSourceError (\e -> printErrAndMaybeExit e >> return False) $ do
+          r <- GHC.typecheckModule =<< GHC.parseModule =<< GHC.getModSummary modl
+          dflags <- getDynFlags
+          liftIO $ putStrLn $ showSDoc dflags $
+           case GHC.moduleInfo r of
+             cm | Just scope <- GHC.modInfoTopLevelScope cm ->
+                let
+                    (loc, glob) = assert (all isExternalName scope) $
+                                  partition ((== modl) . GHC.moduleName . GHC.nameModule) scope
+                in
+                        (text "global names: " <+> ppr glob) $$
+                        (text "local  names: " <+> ppr loc)
+             _ -> empty
+          return True
+  afterLoad (successIf ok) Check
+
+-----------------------------------------------------------------------------
+-- :doc
+
+docCmd :: GHC.GhcMonad m => String -> m ()
+docCmd "" =
+  throwGhcException (CmdLineError "syntax: ':doc <thing-you-want-docs-for>'")
+docCmd s  = do
+  -- TODO: Maybe also get module headers for module names
+  names <- GHC.parseName s
+
+  docs <- traverse (buildDocComponents s) names
+
+  let sdocs = pprDocs (NE.toList docs)
+      sdocs' = vcat (intersperse (text "") sdocs)
+  sdoc <- showSDocForUser' sdocs'
+  liftIO (putStrLn sdoc)
+
+data DocComponents =
+  DocComponents
+    { docs      :: Maybe [HsDoc GhcRn]   -- ^ subject's haddocks
+    , sigAndLoc :: Maybe SDoc          -- ^ type signature + category + location
+    , argDocs   :: IntMap (HsDoc GhcRn) -- ^ haddocks for arguments
+    }
+
+buildDocComponents :: GHC.GhcMonad m => String -> Name -> m DocComponents
+buildDocComponents str name = do
+  mbThing <- GHC.lookupName name
+  let sigAndLoc = sigAndLocDoc str <$> mbThing
+  (docs, argDocs)
+    <- either handleGetDocsFailure pure
+         =<< GHC.getDocs name
+
+  pure DocComponents{..}
+
+-- | Produce output containing the type/kind signature, category, and definition
+-- location of a TyThing.
+sigAndLocDoc :: String -> TyThing -> SDoc
+sigAndLocDoc str tyThing =
+  let tyThingTyDoc :: TyThing -> SDoc
+      tyThingTyDoc = \case
+        AnId i                      -> pprSigmaType $ varType i
+        AConLike (RealDataCon dc)   -> pprSigmaType $ dataConDisplayType False dc
+        AConLike (PatSynCon patSyn) -> pprPatSynType patSyn
+        ATyCon tyCon                -> pprSigmaType $ GHC.tyConKind tyCon
+        ACoAxiom _                  -> empty
+
+      tyDoc = tyThingTyDoc tyThing
+      sigDoc = text str <+> nest 2 (dcolon <+> tyDoc)
+      comment =
+        hsep [ char '\t' <> text "--"
+             , pprTyThingCategory tyThing
+             , text "defined" <+> pprNameDefnLoc (getName tyThing)
+             ]
+   in hang sigDoc 2 comment
+
+pprDocs :: [DocComponents] -> [SDoc]
+pprDocs docs
+  | null nonEmptyDocs = pprDoc <$> take 1 docs
+  -- elide <has no documentation> if there's at least one non-empty doc (#15784)
+  | otherwise = pprDoc <$> nonEmptyDocs
+  where
+    empty DocComponents{docs = mb_decl_docs, argDocs = arg_docs}
+      = maybe True null mb_decl_docs && null arg_docs
+    nonEmptyDocs = filter (not . empty) docs
+
+-- TODO: also print arg docs.
+pprDoc :: DocComponents -> SDoc
+pprDoc DocComponents{sigAndLoc = mb_sig_loc, docs = mb_decl_docs} =
+  maybe
+    (text "<has no documentation>")
+    formatDoc
+    mb_decl_docs
+  where
+    formatDoc doc =
+      vcat [ fromMaybe empty mb_sig_loc -- print contextual info (#19055)
+           , pprHsDocStrings $ map hsDocString doc
+           ]
+
+handleGetDocsFailure :: GHC.GhcMonad m => GetDocsFailure -> m a
+handleGetDocsFailure no_docs = do
+  dflags <- getDynFlags
+  let msg = showPpr dflags no_docs
+  throwGhcException $ case no_docs of
+    NameHasNoModule {} -> Sorry msg
+    NoDocsInIface {} -> InstallationError msg
+    InteractiveName -> ProgramError msg
+
+-----------------------------------------------------------------------------
+-- :instances
+
+instancesCmd :: String -> InputT GHCi ()
+instancesCmd "" =
+  throwGhcException (CmdLineError "syntax: ':instances <type-you-want-instances-for>'")
+instancesCmd s = do
+  handleSourceError printGhciException $ do
+    ty <- GHC.parseInstanceHead s
+    res <- GHC.getInstancesForType ty
+
+    printForUser $ vcat $ map ppr res
+
+-----------------------------------------------------------------------------
+-- :load, :add, :unadd, :reload
+
+-- these are mainly used for displaying a more informative response
+data LoadType = Add !Int | Unadd !Int | Load | Reload | Check
+
+isReload :: LoadType -> Bool
+isReload Reload = True
+isReload _      = False
+
+-- | Sets '-fdefer-type-errors' if 'defer' is true, executes 'load' and unsets
+-- '-fdefer-type-errors' again if it has not been set before.
+wrapDeferTypeErrors :: GHC.GhcMonad m => m a -> m a
+wrapDeferTypeErrors load =
+  MC.bracket
+    (do
+      -- Force originalFlags to avoid leaking the associated HscEnv
+      !originalFlags <- getDynFlags
+      void $ GHC.setProgramDynFlags $
+         setGeneralFlag' Opt_DeferTypeErrors originalFlags
+      return originalFlags)
+    (\originalFlags -> void $ GHC.setProgramDynFlags originalFlags)
+    (\_ -> load)
+
+loadModule :: GhciMonad m => [(FilePath, Maybe UnitId, Maybe Phase)] -> m SuccessFlag
+loadModule fs = do
+  (_, result) <- runAndPrintStats (const Nothing) (loadModule' fs)
+  either (liftIO . Exception.throwIO) return result
+
+-- | @:load@ command
+loadModule_ :: GhciMonad m => [FilePath] -> m ()
+loadModule_ fs = void $ loadModule (zip3 fs (repeat Nothing) (repeat Nothing))
+
+loadModuleDefer :: GhciMonad m => [FilePath] -> m ()
+loadModuleDefer = wrapDeferTypeErrors . loadModule_
+
+loadModule' :: GhciMonad m => [(FilePath, Maybe UnitId, Maybe Phase)] -> m SuccessFlag
+loadModule' files = do
+  let (filenames, uids, phases) = unzip3 files
+  exp_filenames <- mapM expandPath filenames
+  let files' = zip3 exp_filenames uids phases
+  targets <- mapM (\(file, uid, phase) -> GHC.guessTarget file uid phase) files'
+
+  -- NOTE: we used to do the dependency anal first, so that if it
+  -- fails we didn't throw away the current set of modules.  This would
+  -- require some re-working of the GHC interface, so we'll leave it
+  -- as a ToDo for now.
+
+  hsc_env <- GHC.getSession
+  let !dflags = hsc_dflags hsc_env
+
+  let load_module = do
+        -- unload first
+        _ <- GHC.abandonAll
+        clearCaches
+
+        GHC.setTargets targets
+        doLoadAndCollectInfo Load LoadAllTargets
+
+  if gopt Opt_GhciLeakCheck dflags
+    then do
+      -- Grab references to the currently loaded modules so that we can see if
+      -- they leak.
+      leak_indicators <- liftIO $ getLeakIndicators hsc_env
+      success <- load_module
+      liftIO $ checkLeakIndicators dflags leak_indicators
+      return success
+    else
+      load_module
+
+-- | @:add@ command
+addModule :: GhciMonad m => [FilePath] -> m ()
+addModule files = do
+  revertCAFs -- always revert CAFs on load/add.
+  files' <- mapM expandPath files
+  targets <- mapM (\m -> GHC.guessTarget m Nothing Nothing) files'
+  targets' <- filterM checkTarget targets
+  -- remove old targets with the same id; e.g. for :add *M
+  mapM_ GHC.removeTarget [ tid | Target { targetId = tid } <- targets' ]
+  mapM_ GHC.addTarget targets'
+  _ <- doLoadAndCollectInfo (Add $ length targets') LoadAllTargets
+  return ()
+  where
+    checkTarget :: GhciMonad m => Target -> m Bool
+    checkTarget Target { targetId = TargetModule m } = checkTargetModule m
+    checkTarget Target { targetId = TargetFile f _ } = checkTargetFile f
+
+    checkTargetModule :: GhciMonad m => ModuleName -> m Bool
+    checkTargetModule m = do
+      hsc_env <- GHC.getSession
+      let home_unit = hsc_home_unit hsc_env
+      result <- liftIO $
+        Finder.findImportedModule hsc_env m (ThisPkg (homeUnitId home_unit))
+      case result of
+        Found _ _ -> return True
+        _ -> do liftIO $ hPutStrLn stderr ("Module " ++ moduleNameString m ++ " not found")
+                failIfExprEvalMode
+                return False
+
+    checkTargetFile :: GhciMonad m => String -> m Bool
+    checkTargetFile f = do
+      exists <- liftIO (doesFileExist f)
+      unless exists $ do
+        liftIO $ hPutStrLn stderr $ "File " ++ f ++ " not found"
+        failIfExprEvalMode
+      return exists
+
+-- | @:unadd@ command
+unAddModule :: GhciMonad m => [FilePath] -> m ()
+unAddModule files = do
+  files' <- mapM expandPath files
+  targets <- mapM (\m -> GHC.guessTarget m Nothing Nothing) files'
+  let removals = [ tid | Target { targetId = tid } <- targets ]
+  mapM_ GHC.removeTarget removals
+  _ <- doLoadAndCollectInfo (Unadd $ length removals) LoadAllTargets
+  return ()
+
+-- | @:reload@ command
+reloadModule :: GhciMonad m => String -> m ()
+reloadModule m = do
+  session <- GHC.getSession
+  let home_unit = homeUnitId (hsc_home_unit session)
+  ok <- doLoadAndCollectInfo Reload (loadTargets home_unit)
+  when (failed ok) failIfExprEvalMode
+  where
+    loadTargets hu | null m    = LoadAllTargets
+                   | otherwise = LoadUpTo (mkModule hu (GHC.mkModuleName m))
+
+reloadModuleDefer :: GhciMonad m => String -> m ()
+reloadModuleDefer = wrapDeferTypeErrors . reloadModule
+
+-- | Load/compile targets and (optionally) collect module-info
+--
+-- This collects the necessary SrcSpan annotated type information (via
+-- 'collectInfo') required by the @:all-types@, @:loc-at@, @:type-at@,
+-- and @:uses@ commands.
+--
+-- Meta-info collection is not enabled by default and needs to be
+-- enabled explicitly via @:set +c@.  The reason is that collecting
+-- the type-information for all sub-spans can be quite expensive, and
+-- since those commands are designed to be used by editors and
+-- tooling, it's useless to collect this data for normal GHCi
+-- sessions.
+doLoadAndCollectInfo :: GhciMonad m => LoadType -> LoadHowMuch -> m SuccessFlag
+doLoadAndCollectInfo load_type howmuch = do
+  doCollectInfo <- isOptionSet CollectInfo
+
+  doLoad load_type howmuch >>= \case
+    Succeeded | doCollectInfo -> do
+      mod_summaries <- GHC.mgModSummaries <$> getModuleGraph
+      -- MP: :set +c code path only works in single package mode atm, hence
+      -- this call to isLoaded is ok. collectInfo needs to be modified further to
+      -- work with :set +c so I have punted on that for now.
+      loaded <- filterM GHC.isLoaded (map ms_mod_name mod_summaries)
+      v <- mod_infos <$> getGHCiState
+      !newInfos <- collectInfo v loaded
+      modifyGHCiState (\st -> st { mod_infos = newInfos })
+      pure Succeeded
+    flag -> pure flag
+
+doLoad :: GhciMonad m => LoadType -> LoadHowMuch -> m SuccessFlag
+doLoad load_type howmuch = do
+  -- turn off breakpoints before we load: we can't turn them off later, because
+  -- the ModBreaks will have gone away.
+  discardActiveBreakPoints
+
+  resetLastErrorLocations
+  -- Enable buffering stdout and stderr as we're compiling. Keeping these
+  -- handles unbuffered will just slow the compilation down, especially when
+  -- compiling in parallel.
+  let setBuffering t = liftIO $ do
+        hSetBuffering stdout t
+        hSetBuffering stderr t
+  MC.bracket_ (setBuffering LineBuffering) (setBuffering NoBuffering) $ do
+      hmis <- ifaceCache <$> getGHCiState
+      -- If GHCi message gets its own configuration at some stage then this will need to be
+      -- modified to 'embedUnknownDiagnostic'.
+      ok <- trySuccess $ GHC.loadWithCache (Just hmis) (mkUnknownDiagnostic . GHCiMessage) howmuch
+      afterLoad ok load_type
+      pure ok
+
+
+
+afterLoad
+  :: GhciMonad m
+  => SuccessFlag
+  -> LoadType
+  -> m ()
+afterLoad ok load_type = do
+  revertCAFs  -- always revert CAFs on load.
+  discardTickArrays
+  loaded_mods <- getLoadedModules
+  modulesLoadedMsg ok loaded_mods load_type
+  graph <- GHC.getModuleGraph
+  setContextAfterLoad (isReload load_type) (Just graph)
+
+setContextAfterLoad :: GhciMonad m => Bool -> Maybe GHC.ModuleGraph -> m ()
+setContextAfterLoad keep_ctxt Nothing = do
+  setContextKeepingPackageModules keep_ctxt []
+setContextAfterLoad keep_ctxt (Just graph) = do
+  -- load a target if one is available, otherwise load the topmost module.
+  targets <- GHC.getTargets
+  loaded_graph <- filterM is_loaded $ GHC.mgModSummaries' graph
+  case [ m | Just m <- map (findTarget loaded_graph) targets ] of
+        []    ->
+          let graph' = flattenSCCs $ filterToposortToModules $
+                GHC.topSortModuleGraph True (GHC.mkModuleGraph loaded_graph) Nothing
+          in case graph' of
+              [] -> setContextKeepingPackageModules keep_ctxt []
+              xs -> load_this (last xs)
+        (m:_) ->
+          load_this m
+ where
+   is_loaded (GHC.ModuleNode _ ms) = isLoadedModSummary ms
+   is_loaded _ = return False
+
+   findTarget mds t
+    = case mapMaybe (`matches` t) mds of
+        []    -> Nothing
+        (m:_) -> Just m
+
+   (GHC.ModuleNode _ summary) `matches` Target { targetId = TargetModule m }
+        = if GHC.ms_mod_name summary == m then Just summary else Nothing
+   (GHC.ModuleNode _ summary) `matches` Target { targetId = TargetFile f _ }
+        | Just f' <- GHC.ml_hs_file (GHC.ms_location summary)   =
+          if f == f' then Just summary else Nothing
+   _ `matches` _ = Nothing
+
+   load_this summary | m <- GHC.ms_mod summary = do
+        is_interp <- GHC.moduleIsInterpreted m
+        dflags <- getDynFlags
+        let star_ok = is_interp && not (safeLanguageOn dflags)
+              -- We import the module with a * iff
+              --   - it is interpreted, and
+              --   - -XSafe is off (it doesn't allow *-imports)
+        let new_ctx | star_ok   = [mkIIModule (GHC.moduleName m)]
+                    | otherwise = [mkIIDecl   (GHC.moduleName m)]
+        setContextKeepingPackageModules keep_ctxt new_ctx
+
+
+-- | Keep any package modules (except Prelude) when changing the context.
+setContextKeepingPackageModules
+  :: GhciMonad m
+  => Bool                 -- True  <=> keep all of remembered_ctx
+                          -- False <=> just keep package imports
+  -> [InteractiveImport]  -- new context
+  -> m ()
+setContextKeepingPackageModules keep_ctx trans_ctx = do
+
+  st <- getGHCiState
+  let rem_ctx = remembered_ctx st
+  new_rem_ctx <- if keep_ctx then return rem_ctx
+                             else keepPackageImports rem_ctx
+  setGHCiState st{ remembered_ctx = new_rem_ctx,
+                   transient_ctx  = filterSubsumed new_rem_ctx trans_ctx }
+  setGHCContextFromGHCiState
+
+-- | Filters a list of 'InteractiveImport', clearing out any home package
+-- imports so only imports from external packages are preserved.  ('IIModule'
+-- counts as a home package import, because we are only able to bring a
+-- full top-level into scope when the source is available.)
+keepPackageImports
+  :: GHC.GhcMonad m => [InteractiveImport] -> m [InteractiveImport]
+keepPackageImports = filterM is_pkg_import
+  where
+     is_pkg_import :: GHC.GhcMonad m => InteractiveImport -> m Bool
+     is_pkg_import (IIModule _) = return False
+     is_pkg_import (IIDecl d)
+         = do pkgqual <- GHC.renameRawPkgQualM (unLoc $ ideclName d) (ideclPkgQual d)
+              e <- MC.try $ GHC.findQualifiedModule pkgqual mod_name
+              case e :: Either SomeException Module of
+                Left _  -> return False
+                Right m -> return (not (isMainUnitModule m))
+        where
+          mod_name = unLoc (ideclName d)
+
+
+
+modulesLoadedMsg :: GHC.GhcMonad m => SuccessFlag -> [GHC.ModSummary] -> LoadType -> m ()
+modulesLoadedMsg ok mods load_type = do
+  dflags <- getDynFlags
+  when (verbosity dflags > 0) $ do
+     mod_names <- mapM mod_name mods
+     rendered_msg <- showSDocForUser' $
+       if gopt Opt_ShowLoadedModules dflags
+         then loaded_msg mod_names
+         else msg
+     liftIO $ putStrLn rendered_msg
+  where
+    num_mods = length mods
+    none_loaded = num_mods == 0
+
+    loaded_msg names =
+      let mod_commas
+           | null mods = text "none."
+           | otherwise = hsep (punctuate comma names) <> text "."
+      in status <> text ", modules loaded:" <+> mod_commas
+
+    msg  = status <> comma <+> msg' <> dot
+    msg' = case load_type of
+      Reload  -> if none_loaded
+                   then "no modules to be reloaded"
+                   else n_mods num_mods "reloaded"
+      Load    -> if none_loaded
+                   then "unloaded all modules"
+                   else n_mods num_mods "loaded"
+      Check   -> n_mods 1 "checked"
+      Add   n -> n_mods n "added"
+      Unadd n -> n_mods n "unadded"
+    n_mods amount action = speakNOf amount "module" <+> action
+
+    status | Succeeded <- ok = "Ok"
+           | otherwise       = "Failed"
+
+    mod_name mod = do
+        is_interpreted <- GHC.moduleIsBootOrNotObjectLinkable mod
+        pure $ if is_interpreted
+               then ppr (GHC.ms_mod mod)
+               else ppr (GHC.ms_mod mod)
+                    <+> parens (text $ normalise $ msObjFilePath mod)
+                    -- Fix #9887
+
+-- | Run an 'ExceptT' wrapped 'GhcMonad' while handling source errors
+-- and printing 'throwE' strings to 'stderr'. If in expression
+-- evaluation mode - throw GhcException and exit.
+runExceptGhciMonad :: GhciMonad m => ExceptT SDoc m () -> m ()
+runExceptGhciMonad act = handleSourceError printGhciException $
+                         either handleErr pure =<<
+                         runExceptT act
+  where
+    handleErr sdoc = do
+        rendered <- showSDocForUserQualify sdoc
+        liftIO $ hPutStrLn stderr rendered
+        failIfExprEvalMode
+
+-- | Inverse of 'runExceptT' for \"pure\" computations
+-- (c.f. 'except' for 'Except')
+exceptT :: Applicative m => Either e a -> ExceptT e m a
+exceptT = ExceptT . pure
+
+makeHDL'
+  :: forall backend
+   . Backend backend
+  => Proxy backend
+  -> IORef ClashOpts
+  -> [FilePath]
+  -> InputT GHCi ()
+makeHDL' backend opts lst = go =<< case lst of
+  srcs@(_:_) -> return srcs
+  []         -> do
+    modGraph <- GHC.getModuleGraph
+    let sortedGraph =
+          -- TODO: this might break backpack
+          filterToposortToModules $
+          GHC.topSortModuleGraph False modGraph Nothing
+    return $ case (reverse sortedGraph) of
+      ((AcyclicSCC top) : _) -> maybeToList $ (GHC.ml_hs_file . GHC.ms_location) top
+      _                      -> []
+ where
+  go srcs = do
+    dflags <- GHC.getSessionDynFlags
+    goX dflags srcs `MC.finally` recover dflags
+
+  goX dflags srcs = do
+    -- Issue #439 step 1
+    (dflagsX,_,_) <- parseDynamicFlagsCmdLine dflags
+                       [ noLoc "-fobject-code"   -- For #439
+                       , noLoc "-fforce-recomp"  -- Actually compile to object-code
+                       , noLoc "-keep-tmp-files" -- To prevent linker errors from
+                                                 -- multiple calls to :hdl command
+                       ]
+    _ <- GHC.setSessionDynFlags dflagsX
+    reloadModule ""
+    -- Issue #439 step 2
+    -- Unload any object files
+    -- This fixes: https://github.com/clash-lang/clash-compiler/issues/439#issuecomment-522015868
+    env <- GHC.getSession
+    liftIO (Loader.unload (hscInterp env) env [])
+    -- Finally generate the HDL
+    makeHDL backend (return ()) opts srcs
+
+  recover dflags = do
+    _ <- GHC.setSessionDynFlags dflags
+    reloadModule ""
+
+makeHDL
+  :: forall backend m
+   . (GHC.GhcMonad m, Backend backend)
+  => Proxy backend
+  -> Ghc ()
+  -> IORef ClashOpts
+  -> [FilePath]
+  -> m ()
+makeHDL Proxy startAction optsRef srcs = do
+  dflags <- GHC.getSessionDynFlags
+  liftIO $ do startTime <- Clock.getCurrentTime
+              opts0  <- readIORef optsRef
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
+              let iw     = opt_intWidth opts1
+                  hdl    = hdlKind backend
+                  -- determine whether `-outputdir` was used
+                  outputDir = do odir <- objectDir dflags
+                                 hidir <- hiDir dflags
+                                 sdir <- stubDir dflags
+                                 ddir <- dumpDir dflags
+                                 if all (== odir) [hidir,sdir,ddir]
+                                    then Just odir
+                                    else Nothing
+                  idirs = importPaths dflags
+                  opts2 = opts1 { opt_hdlDir = maybe outputDir Just (opt_hdlDir opts1)
+                                , opt_importPaths = idirs}
+                  backend = initBackend @backend opts2
+
+              checkMonoLocalBinds dflags
+              checkImportDirs opts0 idirs
+
+              primDirs_ <- primDirs backend
+
+              forM_ srcs $ \src -> do
+                -- Generate bindings:
+                let dbs = reverse [p | PackageDB (PkgDbPath p) <- packageDBFlags dflags]
+                (clashEnv, clashDesign) <- generateBindings opts2 startAction primDirs_ idirs dbs hdl src (Just dflags)
+
+                let getMain = getMainTopEntity src clashDesign
+                mainTopEntity <- traverse getMain (GHC.mainFunIs dflags)
+                prepTime <- startTime `deepseq` designBindings clashDesign `deepseq` envTyConMap clashEnv `deepseq` Clock.getCurrentTime
+                let prepStartDiff = reportTimeDiff prepTime startTime
+                putStrLn $ "GHC+Clash: Loading modules cumulatively took " ++ prepStartDiff
+
+                -- Generate HDL:
+                Clash.Driver.generateHDL
+                  clashEnv
+                  clashDesign
+                  (Just backend)
+                  (ghcTypeToHWType iw)
+                  ghcEvaluator
+                  evaluator
+                  mainTopEntity
+                  startTime
+
+makeVHDL :: IORef ClashOpts -> [FilePath] -> InputT GHCi ()
+makeVHDL = makeHDL' (Proxy @VHDLState)
+
+makeVerilog :: IORef ClashOpts -> [FilePath] -> InputT GHCi ()
+makeVerilog = makeHDL' (Proxy @VerilogState)
+
+makeSystemVerilog :: IORef ClashOpts -> [FilePath] -> InputT GHCi ()
+makeSystemVerilog = makeHDL' (Proxy @SystemVerilogState)
+
+-----------------------------------------------------------------------------
+-- | @:type@ command. See also Note [TcRnExprMode] in GHC.Tc.Module.
+
+typeOfExpr :: GhciMonad m => String -> m ()
+typeOfExpr str = handleSourceError printErrAndMaybeExit $
+    case break isSpace str of
+      ("+v", _)    -> printForUser (text "`:type +v' has gone; use `:type' instead")
+      ("+d", rest) -> do_it GHC.TM_Default (dropWhile isSpace rest)
+      _            -> do_it GHC.TM_Inst    str
+  where
+    do_it mode expr_str
+      = do { ty <- GHC.exprType mode expr_str
+           ;    printForUser $ sep [ text expr_str
+                                   , nest 2 (dcolon <+> pprSigmaType ty)] }
+
+-----------------------------------------------------------------------------
+-- | @:type-at@ command
+
+typeAtCmd :: GhciMonad m => String -> m ()
+typeAtCmd str = runExceptGhciMonad $ do
+    (span',sample) <- exceptT $ parseSpanArg str
+    infos      <- lift $ mod_infos <$> getGHCiState
+    (info, ty) <- findType infos span' sample
+    let mb_rdr_env = case modinfoRdrEnv info of
+          Strict.Just rdrs -> Just rdrs
+          Strict.Nothing   -> Nothing
+    lift $ printForUserGlobalRdrEnv
+              mb_rdr_env
+              (sep [text sample,nest 2 (dcolon <+> ppr ty)])
+
+-----------------------------------------------------------------------------
+-- | @:uses@ command
+
+usesCmd :: GhciMonad m => String -> m ()
+usesCmd str = runExceptGhciMonad $ do
+    (span',sample) <- exceptT $ parseSpanArg str
+    infos  <- lift $ mod_infos <$> getGHCiState
+    uses   <- findNameUses infos span' sample
+    forM_ uses (liftIO . putStrLn . showSrcSpan)
+
+-----------------------------------------------------------------------------
+-- | @:loc-at@ command
+
+locAtCmd :: GhciMonad m => String -> m ()
+locAtCmd str = runExceptGhciMonad $ do
+    (span',sample) <- exceptT $ parseSpanArg str
+    infos    <- lift $ mod_infos <$> getGHCiState
+    (_,_,sp) <- findLoc infos span' sample
+    liftIO . putStrLn . showSrcSpan $ sp
+
+-----------------------------------------------------------------------------
+-- | @:all-types@ command
+
+allTypesCmd :: GhciMonad m => String -> m ()
+allTypesCmd _ = runExceptGhciMonad $ do
+    infos <- lift $ mod_infos <$> getGHCiState
+    forM_ (M.elems infos) $ \mi ->
+        forM_ (modinfoSpans mi) (lift . printSpan)
+  where
+    printSpan span'
+      | Just ty <- spaninfoType span' = do
+        tyInfo <- (unwords . words) <$>
+                  showSDocForUserQualify (pprSigmaType ty)
+        liftIO . putStrLn $
+            showRealSrcSpan (spaninfoSrcSpan span') ++ ": " ++ tyInfo
+      | otherwise = return ()
+
+-----------------------------------------------------------------------------
+-- Helpers for locAtCmd/typeAtCmd/usesCmd
+
+-- | Parse a span: <module-name/filepath> <sl> <sc> <el> <ec> <string>
+parseSpanArg :: String -> Either SDoc (RealSrcSpan,String)
+parseSpanArg s = do
+    (fp,s0) <- readAsString (skipWs s)
+    s0'     <- skipWs1 s0
+    (sl,s1) <- readAsInt s0'
+    s1'     <- skipWs1 s1
+    (sc,s2) <- readAsInt s1'
+    s2'     <- skipWs1 s2
+    (el,s3) <- readAsInt s2'
+    s3'     <- skipWs1 s3
+    (ec,s4) <- readAsInt s3'
+
+    trailer <- case s4 of
+        [] -> Right ""
+        _  -> skipWs1 s4
+
+    let fs    = mkFastString fp
+        span' = mkRealSrcSpan (mkRealSrcLoc fs sl sc)
+                              -- End column of RealSrcSpan is the column
+                              -- after the end of the span.
+                              (mkRealSrcLoc fs el (ec + 1))
+
+    return (span',trailer)
+  where
+    readAsInt :: String -> Either SDoc (Int,String)
+    readAsInt "" = Left "Premature end of string while expecting Int"
+    readAsInt s0 = case reads s0 of
+        [s_rest] -> Right s_rest
+        _        -> Left ("Couldn't read" <+> text (show s0) <+> "as Int")
+
+    readAsString :: String -> Either SDoc (String,String)
+    readAsString s0
+      | '"':_ <- s0 = case reads s0 of
+          [s_rest] -> Right s_rest
+          _        -> leftRes
+      | s_rest@(_:_,_) <- breakWs s0 = Right s_rest
+      | otherwise = leftRes
+      where
+        leftRes = Left ("Couldn't read" <+> text (show s0) <+> "as String")
+
+    skipWs1 :: String -> Either SDoc String
+    skipWs1 (c:cs) | isWs c = Right (skipWs cs)
+    skipWs1 s0 = Left ("Expected whitespace in" <+> text (show s0))
+
+    isWs    = (`elem` [' ','\t'])
+    skipWs  = dropWhile isWs
+    breakWs = break isWs
+
+
+-- | Pretty-print \"real\" 'SrcSpan's as
+-- @<filename>:(<line>,<col>)-(<line-end>,<col-end>)@
+-- while simply unpacking 'UnhelpfulSpan's
+showSrcSpan :: SrcSpan -> String
+showSrcSpan (UnhelpfulSpan s)  = unpackFS (unhelpfulSpanFS s)
+showSrcSpan (RealSrcSpan spn _) = showRealSrcSpan spn
+
+-- | Variant of 'showSrcSpan' for 'RealSrcSpan's
+showRealSrcSpan :: RealSrcSpan -> String
+showRealSrcSpan spn = concat [ fp, ":(", show sl, ",", show sc
+                             , ")-(", show el, ",", show ec, ")"
+                             ]
+  where
+    fp = unpackFS (srcSpanFile spn)
+    sl = srcSpanStartLine spn
+    sc = srcSpanStartCol  spn
+    el = srcSpanEndLine   spn
+    -- The end column is the column after the end of the span see the
+    -- RealSrcSpan module
+    ec = let ec' = srcSpanEndCol    spn in if ec' == 0 then 0 else ec' - 1
+
+-----------------------------------------------------------------------------
+-- | @:kind@ command
+
+kindOfType :: GhciMonad m => Bool -> String -> m ()
+kindOfType norm str = handleSourceError printErrAndMaybeExit $ do
+    (ty, kind) <- GHC.typeKind norm str
+    printForUser $ vcat [ text str <+> dcolon <+> pprSigmaType kind
+                        , ppWhen norm $ equals <+> pprSigmaType ty ]
+
+-----------------------------------------------------------------------------
+-- :quit
+
+quit :: Monad m => String -> m CmdExecOutcome
+quit _ = return CleanExit
+
+
+-----------------------------------------------------------------------------
+-- :script
+
+-- running a script file #1363
+
+scriptCmd :: String -> InputT GHCi ()
+scriptCmd ws = do
+  case words' ws of
+    [s]    -> runScript s
+    _      -> throwGhcException (CmdLineError "syntax:  :script <filename>")
+
+-- | A version of 'words' that treats sequences enclosed in double quotes as
+-- single words and that does not break on backslash-escaped spaces.
+-- E.g., 'words\' "\"lorem ipsum\" dolor"' and 'words\' "lorem\\ ipsum dolor"'
+-- yield '["lorem ipsum", "dolor"]'.
+-- Used to scan for file paths in 'scriptCmd'.
+words' :: String -> [String]
+words' s = case dropWhile isSpace s of
+  "" -> []
+  s'@('\"' : _) | [(w, s'')] <- reads s' -> w : words' s''
+  s' -> go id s'
+ where
+  go acc []                          = [acc []]
+  go acc ('\\' : c : cs) | isSpace c = go (acc . (c :)) cs
+  go acc (c : cs) | isSpace c = acc [] : words' cs
+                  | otherwise = go (acc . (c :)) cs
+
+runScript :: String    -- ^ filename
+           -> InputT GHCi ()
+runScript filename = do
+  filename' <- expandPath filename
+  either_script <- liftIO $ tryIO (openFile filename' ReadMode)
+  case either_script of
+    Left _err    -> throwGhcException (CmdLineError $ "IO error:  \""++filename++"\" "
+                      ++(ioeGetErrorString _err))
+    Right script -> do
+      st <- getGHCiState
+      let prog = progname st
+          line = line_number st
+      setGHCiState st{progname=filename',line_number=0}
+      scriptLoop script
+      liftIO $ hClose script
+      new_st <- getGHCiState
+      setGHCiState new_st{progname=prog,line_number=line}
+  where scriptLoop script = do
+          res <- runOneCommand handler $ fileLoop script
+          case res of
+            Nothing -> return ()
+            Just s  -> if s
+              then scriptLoop script
+              else return ()
+
+-----------------------------------------------------------------------------
+-- :issafe
+
+-- Displaying Safe Haskell properties of a module
+
+isSafeCmd :: GHC.GhcMonad m => String -> m ()
+isSafeCmd m =
+    case words m of
+        [s] | looksLikeModuleName s -> do
+            md <- lookupModule s
+            isSafeModule md
+        [] -> do md <- guessCurrentModule "issafe"
+                 isSafeModule md
+        _ -> throwGhcException (CmdLineError "syntax:  :issafe <module>")
+
+isSafeModule :: GHC.GhcMonad m => Module -> m ()
+isSafeModule m = do
+    mb_mod_info <- GHC.getModuleInfo m
+    when (isNothing mb_mod_info)
+         (throwGhcException $ CmdLineError $ "unknown module: " ++ mname)
+
+    dflags <- getDynFlags
+    hsc_env <- GHC.getSession
+    let iface = GHC.modInfoIface $ fromJust mb_mod_info
+    when (isNothing iface)
+         (throwGhcException $ CmdLineError $ "can't load interface file for module: " ++
+                                    (GHC.moduleNameString $ GHC.moduleName m))
+
+    (msafe, pkgs) <- GHC.moduleTrustReqs m
+    let trust  = show $ getSafeMode $ GHC.mi_trust $ fromJust iface
+        pkg    = if packageTrusted hsc_env m then "trusted" else "untrusted"
+        (good, bad) = tallyPkgs hsc_env pkgs
+
+    -- print info to user...
+    liftIO $ putStrLn $ "Trust type is (Module: " ++ trust ++ ", Package: " ++ pkg ++ ")"
+    liftIO $ putStrLn $ "Package Trust: " ++ (if packageTrustOn dflags then "On" else "Off")
+    when (not $ S.null good)
+         (liftIO $ putStrLn $ "Trusted package dependencies (trusted): " ++
+                        (intercalate ", " $ map (showPpr dflags) (S.toList good)))
+    case msafe && S.null bad of
+        True -> liftIO $ putStrLn $ mname ++ " is trusted!"
+        False -> do
+            when (not $ null bad)
+                 (liftIO $ putStrLn $ "Trusted package dependencies (untrusted): "
+                            ++ (intercalate ", " $ map (showPpr dflags) (S.toList bad)))
+            liftIO $ putStrLn $ mname ++ " is NOT trusted!"
+
+  where
+    mname = GHC.moduleNameString $ GHC.moduleName m
+
+    packageTrusted hsc_env md
+        | isHomeModule (hsc_home_unit hsc_env) md = True
+        | otherwise = unitIsTrusted $ unsafeLookupUnit (hsc_units hsc_env) (moduleUnit md)
+
+    tallyPkgs hsc_env deps | not (packageTrustOn dflags) = (S.empty, S.empty)
+                          | otherwise = S.partition part deps
+        where part pkg   = unitIsTrusted $ unsafeLookupUnitId unit_state pkg
+              unit_state = hsc_units hsc_env
+              dflags     = hsc_dflags hsc_env
+
+-----------------------------------------------------------------------------
+-- :browse
+
+-- Browsing a module's contents
+
+browseCmd :: GHC.GhcMonad m => Bool -> String -> m ()
+browseCmd bang m =
+  case words m of
+    ['*':s] | looksLikeModuleName s -> do
+        md <- wantInterpretedModule s
+        browseModule bang md False
+    [s] | looksLikeModuleName s -> do
+        md <- lookupModule s
+        browseModule bang md True
+    [] -> do md <- guessCurrentModule ("browse" ++ if bang then "!" else "")
+             browseModule bang md True
+    _ -> throwGhcException (CmdLineError "syntax:  :browse <module>")
+
+guessCurrentModule :: GHC.GhcMonad m => String -> m Module
+-- Guess which module the user wants to browse.  Pick
+-- modules that are interpreted first.  The most
+-- recently-added module occurs last, it seems.
+guessCurrentModule cmd = do
+  imports <- GHC.getContext
+  case imports of
+    [] -> throwGhcException $ CmdLineError (':' : cmd ++ ": no current module")
+    IIModule m : _ -> GHC.findQualifiedModule NoPkgQual m
+    IIDecl d : _ -> do
+      pkgqual <- GHC.renameRawPkgQualM (unLoc $ ideclName d) (ideclPkgQual d)
+      GHC.findQualifiedModule pkgqual (unLoc (ideclName d))
+
+-- without bang, show items in context of their parents and omit children
+-- with bang, show class methods and data constructors separately, and
+--            indicate import modules, to aid qualifying unqualified names
+-- with sorted, sort items alphabetically
+browseModule :: GHC.GhcMonad m => Bool -> Module -> Bool -> m ()
+browseModule bang modl exports_only = do
+  mb_mod_info <- GHC.getModuleInfo modl
+  case mb_mod_info of
+    Nothing -> throwGhcException (CmdLineError ("unknown module: " ++
+                                GHC.moduleNameString (GHC.moduleName modl)))
+    Just mod_info -> do
+        let names
+               | exports_only = GHC.modInfoExports mod_info
+               | otherwise    = GHC.modInfoTopLevelScope mod_info
+                                `orElse` []
+
+                -- sort alphabetically name, but putting locally-defined
+                -- identifiers first. We would like to improve this; see #1799.
+            sorted_names = loc_sort local ++ occ_sort external
+                where
+                (local,external) = assert (all isExternalName names) $
+                                   partition ((==modl) . nameModule) names
+                occ_sort = sortBy (compare `on` nameOccName)
+                -- try to sort by src location. If the first name in our list
+                -- has a good source location, then they all should.
+                loc_sort ns
+                      | n:_ <- ns, isGoodSrcSpan (nameSrcSpan n)
+                      = sortBy (SrcLoc.leftmost_smallest `on` nameSrcSpan) ns
+                      | otherwise
+                      = occ_sort ns
+
+        mb_things <- mapM GHC.lookupName sorted_names
+        let filtered_things = filterOutChildren (\t -> t) (catMaybes mb_things)
+
+        rdr_env <- GHC.getGRE
+
+        let things | bang      = catMaybes mb_things
+                   | otherwise = filtered_things
+            pretty | bang      = pprTyThing showToHeader
+                   | otherwise = pprTyThingInContext showToHeader
+
+            labels  [] = text "-- not currently imported"
+            labels  l  = text $ intercalate "\n" $ map qualifier l
+
+            qualifier :: Maybe [ModuleName] -> String
+            qualifier  = maybe "-- defined locally"
+                             (("-- imported via "++) . intercalate ", "
+                               . map GHC.moduleNameString)
+            importInfo = RdrName.getGRE_NameQualifier_maybes rdr_env
+
+            modNames :: [[Maybe [ModuleName]]]
+            modNames   = map (importInfo . GHC.getName) things
+
+            -- annotate groups of imports with their import modules
+            -- the default ordering is somewhat arbitrary, so we group
+            -- by header and sort groups; the names themselves should
+            -- really come in order of source appearance.. (#1799)
+            annotate mts = concatMap (\(m,ts)->labels m:ts)
+                         $ sortBy cmpQualifiers $ grp mts
+              where cmpQualifiers =
+                      compare `on` (map (fmap (map (unpackFS . moduleNameFS))) . fst)
+            grp []            = []
+            grp mts@((m,_):_) = (m,map snd g) : grp ng
+              where (g,ng) = partition ((==m).fst) mts
+
+        let prettyThings, prettyThings' :: [SDoc]
+            prettyThings = map pretty things
+            prettyThings' | bang      = annotate $ zip modNames prettyThings
+                          | otherwise = prettyThings
+
+        -- :browse reports qualifiers wrt current context
+        rendered_things <- showSDocForUser' (vcat prettyThings')
+        liftIO $ putStrLn rendered_things
+        -- ToDo: modInfoInstances currently throws an exception for
+        -- package modules.  When it works, we can do this:
+        --        $$ vcat (map GHC.pprInstance (GHC.modInfoInstances mod_info))
+
+
+-----------------------------------------------------------------------------
+-- :module
+
+-- Setting the module context.  For details on context handling see
+-- "remembered_ctx" and "transient_ctx" in GhciMonad.
+
+moduleCmd :: GhciMonad m => String -> m ()
+moduleCmd str
+  | all sensible strs = cmd
+  | otherwise = throwGhcException (CmdLineError "syntax:  :module [+/-] [*]M1 ... [*]Mn")
+  where
+    (cmd, strs) =
+        case str of
+          '+':stuff -> rest addModulesToContext   stuff
+          '-':stuff -> rest remModulesFromContext stuff
+          stuff     -> rest setContext            stuff
+
+    rest op stuff = (op as bs, stuffs)
+       where (as,bs) = partitionWith starred stuffs
+             stuffs  = words stuff
+
+    sensible ('*':m) = looksLikeModuleName m
+    sensible m       = looksLikeModuleName m
+
+    starred ('*':m) = Left  (GHC.mkModuleName m)
+    starred m       = Right (GHC.mkModuleName m)
+
+
+-- -----------------------------------------------------------------------------
+-- Four ways to manipulate the context:
+--   (a) :module +<stuff>:     addModulesToContext
+--   (b) :module -<stuff>:     remModulesFromContext
+--   (c) :module <stuff>:      setContext
+--   (d) import <module>...:   addImportToContext
+
+addModulesToContext :: GhciMonad m => [ModuleName] -> [ModuleName] -> m ()
+addModulesToContext starred unstarred = restoreContextOnFailure $ do
+   addModulesToContext_ starred unstarred
+
+addModulesToContext_ :: GhciMonad m => [ModuleName] -> [ModuleName] -> m ()
+addModulesToContext_ starred unstarred = do
+   mapM_ addII (map mkIIModule starred ++ map mkIIDecl unstarred)
+   setGHCContextFromGHCiState
+
+remModulesFromContext :: GhciMonad m => [ModuleName] -> [ModuleName] -> m ()
+remModulesFromContext  starred unstarred = do
+   -- we do *not* call restoreContextOnFailure here.  If the user
+   -- is trying to fix up a context that contains errors by removing
+   -- modules, we don't want GHC to silently put them back in again.
+   mapM_ rm (starred ++ unstarred)
+   setGHCContextFromGHCiState
+ where
+   rm :: GhciMonad m => ModuleName -> m ()
+   rm str = do
+     m <- moduleName <$> lookupModuleName str
+     let filt = filter ((/=) m . iiModuleName)
+     modifyGHCiState $ \st ->
+        st { remembered_ctx = filt (remembered_ctx st)
+           , transient_ctx  = filt (transient_ctx st) }
+
+setContext :: GhciMonad m => [ModuleName] -> [ModuleName] -> m ()
+setContext starred unstarred = restoreContextOnFailure $ do
+  modifyGHCiState $ \st -> st { remembered_ctx = [], transient_ctx = [] }
+                                -- delete the transient context
+  addModulesToContext_ starred unstarred
+
+addImportToContext :: GhciMonad m => ImportDecl GhcPs -> m ()
+addImportToContext idecl = restoreContextOnFailure $ do
+  addII (IIDecl idecl)   -- #5836
+  setGHCContextFromGHCiState
+
+-- Util used by addImportToContext and addModulesToContext
+addII :: GhciMonad m => InteractiveImport -> m ()
+addII iidecl = do
+  checkAdd iidecl
+  modifyGHCiState $ \st ->
+     st { remembered_ctx = addNotSubsumed iidecl (remembered_ctx st)
+        , transient_ctx = filter (not . (iidecl `iiSubsumes`))
+                                 (transient_ctx st)
+        }
+
+-- Sometimes we can't tell whether an import is valid or not until
+-- we finally call 'GHC.setContext'.  e.g.
+--
+--   import System.IO (foo)
+--
+-- will fail because System.IO does not export foo.  In this case we
+-- don't want to store the import in the context permanently, so we
+-- catch the failure from 'setGHCContextFromGHCiState' and set the
+-- context back to what it was.
+--
+-- See #6007
+--
+restoreContextOnFailure :: GhciMonad m => m a -> m a
+restoreContextOnFailure do_this = do
+  st <- getGHCiState
+  let rc = remembered_ctx st; tc = transient_ctx st
+  do_this `MC.onException` (modifyGHCiState $ \st' ->
+     st' { remembered_ctx = rc, transient_ctx = tc })
+
+-- -----------------------------------------------------------------------------
+-- Validate a module that we want to add to the context
+
+checkAdd :: GHC.GhcMonad m => InteractiveImport -> m ()
+checkAdd ii = do
+  dflags <- getDynFlags
+  let safe = safeLanguageOn dflags
+  case ii of
+    IIModule modname
+       | safe -> throwGhcException $ CmdLineError "can't use * imports with Safe Haskell"
+       | otherwise -> wantInterpretedModuleName modname >> return ()
+
+    IIDecl d -> do
+       let modname = unLoc (ideclName d)
+       pkgqual <- GHC.renameRawPkgQualM modname (ideclPkgQual d)
+       m <- GHC.lookupQualifiedModule pkgqual modname
+       when safe $ do
+           t <- GHC.isModuleTrusted m
+           when (not t) $ throwGhcException $ ProgramError $ ""
+
+-- -----------------------------------------------------------------------------
+-- Update the GHC API's view of the context
+
+-- | Sets the GHC context from the GHCi state.  The GHC context is
+-- always set this way, we never modify it incrementally.
+--
+-- We ignore any imports for which the ModuleName does not currently
+-- exist.  This is so that the remembered_ctx can contain imports for
+-- modules that are not currently loaded, perhaps because we just did
+-- a :reload and encountered errors.
+--
+-- Prelude is added if not already present in the list.  Therefore to
+-- override the implicit Prelude import you can say 'import Prelude ()'
+-- at the prompt, just as in Haskell source.
+--
+setGHCContextFromGHCiState :: GhciMonad m => m ()
+setGHCContextFromGHCiState = do
+  st <- getGHCiState
+      -- re-use checkAdd to check whether the module is valid.  If the
+      -- module does not exist, we do *not* want to print an error
+      -- here, we just want to silently keep the module in the context
+      -- until such time as the module reappears again.  So we ignore
+      -- the actual exception thrown by checkAdd, using tryBool to
+      -- turn it into a Bool.
+  iidecls <- filterM (tryBool.checkAdd) (transient_ctx st ++ remembered_ctx st)
+
+  prel_iidecls <- getImplicitPreludeImports iidecls
+  valid_prel_iidecls <- filterM (tryBool . checkAdd) prel_iidecls
+
+  extra_imports <- filterM (tryBool . checkAdd) (map IIDecl (extra_imports st))
+
+  GHC.setContext $ iidecls ++ extra_imports ++ valid_prel_iidecls
+
+
+getImplicitPreludeImports :: GhciMonad m
+                          => [InteractiveImport] -> m [InteractiveImport]
+getImplicitPreludeImports iidecls = do
+     -- allow :seti to override -XNoImplicitPrelude
+  st <- getGHCiState
+
+  -- We add the prelude imports if there are no *-imports, and we also
+  -- allow each prelude import to be subsumed by another explicit import
+  -- of the same module.  This means that you can override the prelude import
+  -- with "import Prelude hiding (map)", for example.
+  let prel_iidecls =
+         if not (any isIIModule iidecls)
+            then [ IIDecl imp
+                 | imp <- prelude_imports st
+                 , not (any (sameImpModule imp) iidecls) ]
+            else []
+
+  return prel_iidecls
+
+-- -----------------------------------------------------------------------------
+-- Utils on InteractiveImport
+
+mkIIModule :: ModuleName -> InteractiveImport
+mkIIModule = IIModule
+
+mkIIDecl :: ModuleName -> InteractiveImport
+mkIIDecl = IIDecl . simpleImportDecl
+
+iiModules :: [InteractiveImport] -> [ModuleName]
+iiModules is = [m | IIModule m <- is]
+
+isIIModule :: InteractiveImport -> Bool
+isIIModule (IIModule _) = True
+isIIModule _ = False
+
+iiModuleName :: InteractiveImport -> ModuleName
+iiModuleName (IIModule m) = m
+iiModuleName (IIDecl d)   = unLoc (ideclName d)
+
+preludeModuleName :: ModuleName
+preludeModuleName = GHC.mkModuleName "Clash.Prelude"
+
+sameImpModule :: ImportDecl GhcPs -> InteractiveImport -> Bool
+sameImpModule _ (IIModule _) = False -- we only care about imports here
+sameImpModule imp (IIDecl d) = unLoc (ideclName d) == unLoc (ideclName imp)
+
+addNotSubsumed :: InteractiveImport
+               -> [InteractiveImport] -> [InteractiveImport]
+addNotSubsumed i is
+  | any (`iiSubsumes` i) is = is
+  | otherwise               = i : filter (not . (i `iiSubsumes`)) is
+
+-- | @filterSubsumed is js@ returns the elements of @js@ not subsumed
+-- by any of @is@.
+filterSubsumed :: [InteractiveImport] -> [InteractiveImport]
+               -> [InteractiveImport]
+filterSubsumed is js = filter (\j -> not (any (`iiSubsumes` j) is)) js
+
+-- | Returns True if the left import subsumes the right one.  Doesn't
+-- need to be 100% accurate, conservatively returning False is fine.
+-- (EXCEPT: (IIModule m) *must* subsume itself, otherwise a panic in
+-- plusProv will ensue (#5904))
+--
+-- Note that an IIModule does not necessarily subsume an IIDecl,
+-- because e.g. a module might export a name that is only available
+-- qualified within the module itself.
+--
+-- Note that 'import M' does not necessarily subsume 'import M(foo)',
+-- because M might not export foo and we want an error to be produced
+-- in that case.
+--
+iiSubsumes :: InteractiveImport -> InteractiveImport -> Bool
+iiSubsumes (IIModule m1) (IIModule m2) = m1==m2
+iiSubsumes (IIDecl d1) (IIDecl d2)      -- A bit crude
+  =  unLoc (ideclName d1) == unLoc (ideclName d2)
+     && ideclAs d1 == ideclAs d2
+     && (not (isImportDeclQualified (ideclQualified d1)) || isImportDeclQualified (ideclQualified d2))
+     && (ideclImportList d1 `hidingSubsumes` ideclImportList d2)
+  where
+     _                    `hidingSubsumes` Just (Exactly,L _ []) = True
+     Just (Exactly, L _ xs) `hidingSubsumes` Just (Exactly,L _ ys)
+                                                           = all (`elem` xs) ys
+     h1                   `hidingSubsumes` h2              = h1 == h2
+iiSubsumes _ _ = False
+
+
+----------------------------------------------------------------------------
+-- :set
+
+-- set options in the interpreter.  Syntax is exactly the same as the
+-- ghc command line, except that certain options aren't available (-C,
+-- -E etc.)
+--
+-- This is pretty fragile: most options won't work as expected.  ToDo:
+-- figure out which ones & disallow them.
+
+setCmd :: GhciMonad m => String -> m ()
+setCmd ""   = showOptions False
+setCmd "-a" = showOptions True
+setCmd str
+  = case getCmd str of
+    Right ("args",    rest) ->
+        case toArgsNoLoc rest of
+            Left err -> liftIO (hPutStrLn stderr err)
+            Right args -> setArgs args
+    Right ("prog",    rest) ->
+        case toArgsNoLoc rest of
+            Right [prog] -> setProg prog
+            _ -> liftIO (hPutStrLn stderr "syntax: :set prog <progname>")
+
+    Right ("prompt",           rest) ->
+        setPromptString setPrompt (dropWhile isSpace rest)
+                        "syntax: set prompt <string>"
+    Right ("prompt-function",  rest) ->
+        setPromptFunc setPrompt $ dropWhile isSpace rest
+    Right ("prompt-cont",          rest) ->
+        setPromptString setPromptCont (dropWhile isSpace rest)
+                        "syntax: :set prompt-cont <string>"
+    Right ("prompt-cont-function", rest) ->
+        setPromptFunc setPromptCont $ dropWhile isSpace rest
+
+    Right ("editor",  rest) -> setEditor  $ dropWhile isSpace rest
+    Right ("stop",    rest) -> setStop    $ dropWhile isSpace rest
+    Right ("local-config", rest) ->
+        setLocalConfigBehaviour $ dropWhile isSpace rest
+    _ -> case toArgsNoLoc str of
+         Left err -> liftIO (hPutStrLn stderr err)
+         Right wds -> () <$ keepGoing' setOptions wds
+
+setiCmd :: GhciMonad m => String -> m ()
+setiCmd ""   = GHC.getInteractiveDynFlags >>= liftIO . showDynFlags False
+setiCmd "-a" = GHC.getInteractiveDynFlags >>= liftIO . showDynFlags True
+setiCmd str  =
+  case toArgsNoLoc str of
+    Left err -> liftIO (hPutStrLn stderr err)
+    Right wds -> newDynFlags True wds
+
+showOptions :: GhciMonad m => Bool -> m ()
+showOptions show_all
+  = do st <- getGHCiState
+       dflags <- getDynFlags
+       let opts = options st
+       liftIO $ putStrLn (showSDoc dflags (
+              text "options currently set: " <>
+              if null opts
+                   then text "none."
+                   else hsep (map (\o -> char '+' <> text (optToStr o)) opts)
+           ))
+       liftIO $ showDynFlags show_all dflags
+
+
+showDynFlags :: Bool -> DynFlags -> IO ()
+showDynFlags show_all dflags = do
+  showLanguages' show_all dflags
+  putStrLn $ showSDoc dflags $
+     text "GHCi-specific dynamic flag settings:" $$
+         nest 2 (vcat (map (setting "-f" "-fno-" gopt) ghciFlags))
+  putStrLn $ showSDoc dflags $
+     text "other dynamic, non-language, flag settings:" $$
+         nest 2 (vcat (map (setting "-f" "-fno-" gopt) others))
+  putStrLn $ showSDoc dflags $
+     text "warning settings:" $$
+         nest 2 (vcat (map (setting "-W" "-Wno-" wopt) DynFlags.wWarningFlags))
+  where
+        setting :: String -> String -> (flag -> DynFlags -> Bool) -> FlagSpec flag -> SDoc
+        setting prefix noPrefix test flag
+          | quiet     = empty
+          | is_on     = text prefix <> text name
+          | otherwise = text noPrefix <> text name
+          where name = flagSpecName flag
+                f = flagSpecFlag flag
+                is_on = test f dflags
+                quiet = not show_all && test f default_dflags == is_on
+
+        default_dflags = defaultDynFlags (settings dflags)
+
+        (ghciFlags,others)  = partition (\f -> flagSpecFlag f `elem` flgs)
+                                        DynFlags.fFlags
+        flgs = [ Opt_PrintExplicitForalls
+               , Opt_PrintExplicitKinds
+               , Opt_PrintUnicodeSyntax
+               , Opt_PrintBindResult
+               , Opt_BreakOnException
+               , Opt_BreakOnError
+               , Opt_PrintEvldWithShow
+               ]
+
+setArgs, setOptions :: GhciMonad m => [String] -> m ()
+setProg, setEditor, setStop :: GhciMonad m => String -> m ()
+setLocalConfigBehaviour :: GhciMonad m => String -> m ()
+
+setArgs args = do
+  st <- getGHCiState
+  wrapper <- mkEvalWrapper (progname st) args
+  setGHCiState st { GhciMonad.args = args, evalWrapper = wrapper }
+
+setProg prog = do
+  st <- getGHCiState
+  wrapper <- mkEvalWrapper prog (GhciMonad.args st)
+  setGHCiState st { progname = prog, evalWrapper = wrapper }
+
+setEditor cmd = modifyGHCiState (\st -> st { editor = cmd })
+
+setLocalConfigBehaviour s
+  | s == "source" =
+      modifyGHCiState (\st -> st { localConfig = SourceLocalConfig })
+  | s == "ignore" =
+      modifyGHCiState (\st -> st { localConfig = IgnoreLocalConfig })
+  | otherwise = throwGhcException
+      (CmdLineError "syntax:  :set local-config { source | ignore }")
+
+setStop str@(c:_) | isDigit c
+  = do let (nm_str,rest) = break (not.isDigit) str
+           nm = read nm_str
+       st <- getGHCiState
+       let old_breaks = breaks st
+       case IntMap.lookup nm old_breaks of
+         Nothing ->  printForUser (text "Breakpoint" <+> ppr nm <+>
+                                   text "does not exist")
+         Just loc -> do
+            let new_breaks = IntMap.insert nm
+                                loc { onBreakCmd = dropWhile isSpace rest }
+                                old_breaks
+            setGHCiState st{ breaks = new_breaks }
+setStop cmd = modifyGHCiState (\st -> st { stop = cmd })
+
+setPrompt :: GhciMonad m => PromptFunction -> m ()
+setPrompt v = modifyGHCiState (\st -> st {prompt = v})
+
+setPromptCont :: GhciMonad m => PromptFunction -> m ()
+setPromptCont v = modifyGHCiState (\st -> st {prompt_cont = v})
+
+setPromptFunc :: GHC.GhcMonad m => (PromptFunction -> m ()) -> String -> m ()
+setPromptFunc fSetPrompt s = do
+    -- We explicitly annotate the type of the expression to ensure
+    -- that unsafeCoerce# is passed the exact type necessary rather
+    -- than a more general one
+    let exprStr = "(" ++ s ++ ") :: [String] -> Int -> IO String"
+    (HValue funValue) <- GHC.compileExpr exprStr
+    fSetPrompt (convertToPromptFunction $ unsafeCoerce funValue)
+    where
+      convertToPromptFunction :: ([String] -> Int -> IO String)
+                              -> PromptFunction
+      convertToPromptFunction func = (\mods line -> liftIO $
+                                       liftM text (func mods line))
+
+setPromptString :: MonadIO m
+                => (PromptFunction -> m ()) -> String -> String -> m ()
+setPromptString fSetPrompt value err = do
+  if null value
+    then liftIO $ hPutStrLn stderr $ err
+    else case value of
+           ('\"':_) ->
+             case reads value of
+               [(value', xs)] | all isSpace xs ->
+                 setParsedPromptString fSetPrompt value'
+               _ -> liftIO $ hPutStrLn stderr
+                             "Can't parse prompt string. Use Haskell syntax."
+           _ ->
+             setParsedPromptString fSetPrompt value
+
+setParsedPromptString :: MonadIO m
+                      => (PromptFunction -> m ()) ->  String -> m ()
+setParsedPromptString fSetPrompt s = do
+  case (checkPromptStringForErrors s) of
+    Just err ->
+      liftIO $ hPutStrLn stderr err
+    Nothing ->
+      fSetPrompt $ generatePromptFunctionFromString s
+
+setOptions wds =
+   do -- first, deal with the GHCi opts (+s, +t, etc.)
+      let (plus_opts, minus_opts)  = partitionWith isPlus wds
+      mapM_ setOpt plus_opts
+      -- then, dynamic flags
+      when (not (null minus_opts)) $ newDynFlags False minus_opts
+
+-- | newDynFlags will *not* read package environment files, therefore we
+-- use 'parseDynamicFlagsCmdLine' rather than 'parseDynamicFlags'. This
+-- function is called very often and results in repeatedly loading
+-- environment files (see #19650)
+newDynFlags :: GhciMonad m => Bool -> [String] -> m ()
+newDynFlags interactive_only minus_opts = do
+      let lopts = map noLoc minus_opts
+
+      logger <- getLogger
+      idflags0 <- GHC.getInteractiveDynFlags
+      (idflags1, leftovers, warns) <- DynFlags.parseDynamicFlagsCmdLine idflags0 lopts
+
+      liftIO $ printOrThrowDiagnostics logger (initPrintConfig idflags1) (initDiagOpts idflags1) (GhcDriverMessage <$> warns)
+      when (not $ null leftovers) (unknownFlagsErr $ map unLoc leftovers)
+
+      when (interactive_only && packageFlagsChanged idflags1 idflags0) $ do
+          liftIO $ hPutStrLn stderr "cannot set package flags with :seti; use :set"
+      GHC.setInteractiveDynFlags idflags1
+      installInteractivePrint (interactivePrint idflags1) False
+
+      dflags0 <- getDynFlags
+
+      when (not interactive_only) $ do
+        (dflags1, _, _) <- liftIO $ DynFlags.parseDynamicFlagsCmdLine dflags0 lopts
+        must_reload <- GHC.setProgramDynFlags dflags1
+
+        -- if the package flags changed, reset the context and link
+        -- the new packages.
+        hsc_env <- GHC.getSession
+        let dflags2 = hsc_dflags hsc_env
+        let interp  = hscInterp hsc_env
+        when (packageFlagsChanged dflags2 dflags0) $ do
+          when (verbosity dflags2 > 0) $
+            liftIO . putStrLn $
+              "package flags have changed, resetting and loading new packages..."
+          -- Clear caches and eventually defined breakpoints. (#1620)
+          clearCaches
+          when must_reload $ do
+            let units = preloadUnits (hsc_units hsc_env)
+            liftIO $ Loader.loadPackages interp hsc_env units
+          -- package flags changed, we can't re-use any of the old context
+          setContextAfterLoad False Nothing
+          -- and copy the package flags to the interactive DynFlags
+          idflags <- GHC.getInteractiveDynFlags
+          GHC.setInteractiveDynFlags
+              idflags{ packageFlags = packageFlags dflags2 }
+
+        let ld0length   = length $ ldInputs dflags0
+            fmrk0length = length $ cmdlineFrameworks dflags0
+
+            newLdInputs     = drop ld0length (ldInputs dflags2)
+            newCLFrameworks = drop fmrk0length (cmdlineFrameworks dflags2)
+
+            dflags'  = dflags2 { ldInputs = newLdInputs
+                               , cmdlineFrameworks = newCLFrameworks
+                               }
+            hsc_env' = hscSetFlags dflags' hsc_env
+
+        when (not (null newLdInputs && null newCLFrameworks)) $
+          liftIO $ Loader.loadCmdLineLibs (hscInterp hsc_env') hsc_env'
+
+      return ()
+
+unknownFlagsErr :: [String] -> a
+unknownFlagsErr fs = throwGhcException $ CmdLineError $ concatMap oneError fs
+  where
+    oneError f =
+        "unrecognised flag: " ++ f ++ "\n" ++
+        (case flagSuggestions ghciFlags f of
+            [] -> ""
+            suggs -> "did you mean one of:\n" ++ unlines (map ("  " ++) suggs))
+    ghciFlags = nubSort $ flagsForCompletion True
+
+unsetOptions :: GhciMonad m => String -> m ()
+unsetOptions str
+  =   -- first, deal with the GHCi opts (+s, +t, etc.)
+     let opts = words str
+         (minus_opts, rest1) = partition isMinus opts
+         (plus_opts, rest2)  = partitionWith isPlus rest1
+         (other_opts, rest3) = partition (`elem` map fst defaulters) rest2
+
+         defaulters =
+           [ ("args"   , setArgs default_args)
+           , ("prog"   , setProg default_progname)
+           , ("prompt"     , setPrompt default_prompt)
+           , ("prompt-cont", setPromptCont default_prompt_cont)
+           , ("editor" , liftIO findEditor >>= setEditor)
+           , ("stop"   , setStop default_stop)
+           ]
+
+         no_flag ('-':'f':rest) = return ("-fno-" ++ rest)
+         no_flag ('-':'X':rest) = return ("-XNo" ++ rest)
+         no_flag f = throwGhcException (ProgramError ("don't know how to reverse " ++ f))
+
+     in case rest3 of
+          opt:_ -> liftIO (putStrLn ("unknown option: '" ++ opt ++ "'"))
+          [] -> do
+             mapM_ (fromJust.flip lookup defaulters) other_opts
+
+             mapM_ unsetOpt plus_opts
+
+             no_flags <- mapM no_flag minus_opts
+             when (not (null no_flags)) $ newDynFlags False no_flags
+
+isMinus :: String -> Bool
+isMinus ('-':_) = True
+isMinus _ = False
+
+isPlus :: String -> Either String String
+isPlus ('+':opt) = Left opt
+isPlus other     = Right other
+
+setOpt, unsetOpt :: GhciMonad m => String -> m ()
+
+setOpt str
+  = case strToGHCiOpt str of
+        Nothing -> liftIO (putStrLn ("unknown option: '" ++ str ++ "'"))
+        Just o  -> setOption o
+
+unsetOpt str
+  = case strToGHCiOpt str of
+        Nothing -> liftIO (putStrLn ("unknown option: '" ++ str ++ "'"))
+        Just o  -> unsetOption o
+
+strToGHCiOpt :: String -> (Maybe GHCiOption)
+strToGHCiOpt "m" = Just Multiline
+strToGHCiOpt "s" = Just ShowTiming
+strToGHCiOpt "t" = Just ShowType
+strToGHCiOpt "r" = Just RevertCAFs
+strToGHCiOpt "c" = Just CollectInfo
+strToGHCiOpt _   = Nothing
+
+optToStr :: GHCiOption -> String
+optToStr Multiline  = "m"
+optToStr ShowTiming = "s"
+optToStr ShowType   = "t"
+optToStr RevertCAFs = "r"
+optToStr CollectInfo = "c"
+
+
+-- ---------------------------------------------------------------------------
+-- :show
+
+showCmd :: forall m. GhciMonad m => String -> m ()
+showCmd ""   = showOptions False
+showCmd "-a" = showOptions True
+showCmd str = do
+    st <- getGHCiState
+    dflags <- getDynFlags
+    hsc_env <- GHC.getSession
+
+    let lookupCmd :: String -> Maybe (m ())
+        lookupCmd name = lookup name $ map (\(_,b,c) -> (b,c)) cmds
+
+        -- (show in help?, command name, action)
+        action :: String -> m () -> (Bool, String, m ())
+        action name m = (True, name, m)
+
+        hidden :: String -> m () -> (Bool, String, m ())
+        hidden name m = (False, name, m)
+
+        cmds =
+            [ action "args"       $ liftIO $ putStrLn (show (GhciMonad.args st))
+            , action "prog"       $ liftIO $ putStrLn (show (progname st))
+            , action "editor"     $ liftIO $ putStrLn (show (editor st))
+            , action "stop"       $ liftIO $ putStrLn (show (stop st))
+            , action "imports"    $ showImports
+            , action "modules"    $ showModules
+            , action "bindings"   $ showBindings
+            , action "linker"     $ do
+               msg <- liftIO $ Loader.showLoaderState (hscInterp hsc_env)
+               dflags <- getDynFlags
+               liftIO $ putStrLn $ showSDoc dflags msg
+            , action "breaks"     $ showBkptTable
+            , action "context"    $ showContext
+            , action "packages"   $ showUnits
+            , action "paths"      $ showPaths
+            , action "language"   $ showLanguages
+            , hidden "languages"  $ showLanguages -- backwards compat
+            , hidden "lang"       $ showLanguages -- useful abbreviation
+            , action "targets"    $ showTargets
+            ]
+
+    case words str of
+      [w] | Just action <- lookupCmd w -> action
+
+      _ -> let helpCmds = [ text name | (True, name, _) <- cmds ]
+           in throwGhcException $ CmdLineError $ showSDoc dflags
+              $ hang (text "syntax:") 4
+              $ hang (text ":show") 6
+              $ brackets (fsep $ punctuate (text " |") helpCmds)
+
+showiCmd :: GHC.GhcMonad m => String -> m ()
+showiCmd str = do
+  case words str of
+        ["languages"]  -> showiLanguages -- backwards compat
+        ["language"]   -> showiLanguages
+        ["lang"]       -> showiLanguages -- useful abbreviation
+        _ -> throwGhcException (CmdLineError ("syntax:  :showi language"))
+
+showImports :: GhciMonad m => m ()
+showImports = do
+  st <- getGHCiState
+  dflags <- getDynFlags
+  let rem_ctx   = reverse (remembered_ctx st)
+      trans_ctx = transient_ctx st
+
+      show_one (IIModule star_m)
+          = ":module +*" ++ moduleNameString star_m
+      show_one (IIDecl imp) = showPpr dflags imp
+
+  prel_iidecls <- getImplicitPreludeImports (rem_ctx ++ trans_ctx)
+
+  let show_prel p = show_one p ++ " -- implicit"
+      show_extra p = show_one (IIDecl p) ++ " -- fixed"
+
+      trans_comment s = s ++ " -- added automatically" :: String
+  --
+  liftIO $ mapM_ putStrLn (map show_one rem_ctx ++
+                           map (trans_comment . show_one) trans_ctx ++
+                           map show_prel prel_iidecls ++
+                           map show_extra (extra_imports st))
+
+showModules :: GHC.GhcMonad m => m ()
+showModules = do
+  loaded_mods <- getLoadedModules
+        -- we want *loaded* modules only, see #1734
+  let show_one ms = do m <- GHC.showModule ms; liftIO (putStrLn m)
+  mapM_ show_one loaded_mods
+
+getLoadedModules :: GHC.GhcMonad m => m [GHC.ModSummary]
+getLoadedModules = do
+  graph <- GHC.getModuleGraph
+  filterM isLoadedModSummary (GHC.mgModSummaries graph)
+
+showBindings :: GHC.GhcMonad m => m ()
+showBindings = do
+    bindings <- GHC.getBindings
+    (insts, finsts) <- GHC.getInsts
+    let idocs  = map GHC.pprInstanceHdr insts
+        fidocs = map GHC.pprFamInst finsts
+        binds = filter (not . isDerivedOccName . getOccName) bindings -- #12525
+        -- See Note [Filter bindings]
+    docs <- mapM makeDoc (reverse binds)
+                  -- reverse so the new ones come last
+    mapM_ printForUserPartWay (docs ++ idocs ++ fidocs)
+  where
+    makeDoc (AnId i) = pprTypeAndContents i
+    makeDoc tt = do
+        mb_stuff <- GHC.getInfo False (getName tt)
+        return $ maybe (text "") pprTT mb_stuff
+
+    pprTT :: (TyThing, Fixity, [GHC.ClsInst], [GHC.FamInst], SDoc) -> SDoc
+    pprTT (thing, fixity, _cls_insts, _fam_insts, _docs)
+      = pprTyThing showToHeader thing
+        $$ showFixity thing fixity
+
+
+printTyThing :: GHC.GhcMonad m => TyThing -> m ()
+printTyThing tyth = printForUser (pprTyThing showToHeader tyth)
+
+isLoadedModSummary :: GHC.GhcMonad m => ModSummary -> m Bool
+isLoadedModSummary ms = GHC.isLoadedModule (ms_unitid ms) (ms_mod_name ms)
+
+{-
+Note [Filter bindings]
+~~~~~~~~~~~~~~~~~~~~~~
+If we don't filter the bindings returned by the function GHC.getBindings,
+then the :show bindings command will also show unwanted bound names,
+internally generated by GHC, eg:
+    $tcFoo :: GHC.Types.TyCon = _
+    $trModule :: GHC.Unit.Module = _ .
+
+The filter was introduced as a fix for #12525 [1]. Comment:1 [2] to this
+ticket contains an analysis of the situation and suggests the solution
+implemented above.
+
+The same filter was also implemented to fix #11051 [3]. See the
+Note [What to show to users] in GHC.Runtime.Eval
+
+[1] https://gitlab.haskell.org/ghc/ghc/issues/12525
+[2] https://gitlab.haskell.org/ghc/ghc/issues/12525#note_123489
+[3] https://gitlab.haskell.org/ghc/ghc/issues/11051
+-}
+
+
+showBkptTable :: GhciMonad m => m ()
+showBkptTable = do
+  st <- getGHCiState
+  printForUser $ prettyLocations (breaks st)
+
+showContext :: GHC.GhcMonad m => m ()
+showContext = do
+   resumes <- GHC.getResumeContext
+   printForUser $ vcat (map pp_resume (reverse resumes))
+  where
+   pp_resume res =
+        text "--> " <> text (GHC.resumeStmt res)
+        $$ nest 2 (pprStopped res)
+
+pprStopped :: GHC.Resume -> SDoc
+pprStopped res =
+  text "Stopped in"
+    <+> ((case mb_mod_name of
+           Nothing -> empty
+           Just mod_name -> ftext (moduleNameFS mod_name) <> char '.')
+         <> text (GHC.resumeDecl res))
+    <> char ',' <+> ppr (GHC.resumeSpan res)
+ where
+  mb_mod_name = moduleName <$> GHC.breakInfo_module <$> GHC.resumeBreakInfo res
+
+showUnits :: GHC.GhcMonad m => m ()
+showUnits = do
+  dflags <- getDynFlags
+  let pkg_flags = packageFlags dflags
+  liftIO $ putStrLn $ showSDoc dflags $
+    text ("active package flags:"++if null pkg_flags then " none" else "") $$
+      nest 2 (vcat (map pprFlag pkg_flags))
+
+showPaths :: GHC.GhcMonad m => m ()
+showPaths = do
+  dflags <- getDynFlags
+  liftIO $ do
+    cwd <- getCurrentDirectory
+    putStrLn $ showSDoc dflags $
+      text "current working directory: " $$
+        nest 2 (text cwd)
+    let ipaths = importPaths dflags
+    putStrLn $ showSDoc dflags $
+      text ("module import search paths:"++if null ipaths then " none" else "") $$
+        nest 2 (vcat (map text ipaths))
+
+showLanguages :: GHC.GhcMonad m => m ()
+showLanguages = getDynFlags >>= liftIO . showLanguages' False
+
+showiLanguages :: GHC.GhcMonad m => m ()
+showiLanguages = GHC.getInteractiveDynFlags >>= liftIO . showLanguages' False
+
+showLanguages' :: Bool -> DynFlags -> IO ()
+showLanguages' show_all dflags =
+  putStrLn $ showSDoc dflags $ vcat
+     [ text "base language is: " <>
+         case lang of
+           Haskell98   -> text "Haskell98"
+           Haskell2010 -> text "Haskell2010"
+           GHC2021     -> text "GHC2021"
+           GHC2024     -> text "GHC2024"
+     , (if show_all then text "all active language options:"
+                    else text "with the following modifiers:") $$
+          nest 2 (vcat (map (setting xopt) DynFlags.xFlags))
+     ]
+  where
+   setting test flag
+          | quiet     = empty
+          | is_on     = text "-X" <> text name
+          | otherwise = text "-XNo" <> text name
+          where name = flagSpecName flag
+                f = flagSpecFlag flag
+                is_on = test f dflags
+                quiet = not show_all && test f default_dflags == is_on
+
+   default_dflags = defaultDynFlags (settings dflags) `lang_set` Just lang
+
+   lang = fromMaybe defaultLanguage (language dflags)
+
+
+showTargets :: GHC.GhcMonad m => m ()
+showTargets = mapM_ showTarget =<< GHC.getTargets
+  where
+    showTarget :: GHC.GhcMonad m => Target -> m ()
+    showTarget Target { targetId = TargetFile f _ } = liftIO (putStrLn f)
+    showTarget Target { targetId = TargetModule m } =
+      liftIO (putStrLn $ moduleNameString m)
+
+-- -----------------------------------------------------------------------------
+-- Completion
+
+completeCmd :: String -> GHCi ()
+completeCmd argLine0 = case parseLine argLine0 of
+    Just ("repl", resultRange, left) -> do
+        (unusedLine,compls) <- ghciCompleteWord (reverse left,"")
+        let compls' = takeRange resultRange compls
+        liftIO . putStrLn $ unwords [ show (length compls'), show (length compls), show (reverse unusedLine) ]
+        forM_ (takeRange resultRange compls) $ \(Completion r _ _) -> do
+            liftIO $ print r
+    _ -> throwGhcException (CmdLineError "Syntax: :complete repl [<range>] <quoted-string-to-complete>")
+  where
+    parseLine [] = Nothing
+    parseLine argLine = case breakSpace argLine of
+      (_, []) -> Nothing
+      (dom, rest1@('"' : _)) -> (dom,,) <$> parseRange "" <*> (readMaybe rest1 :: Maybe String)
+      (dom, rest1) -> (dom,,) <$> parseRange rng <*> readMaybe rest2
+        where
+          (rng, rest2) = breakSpace rest1
+
+    breakSpace = fmap (dropWhile isSpace) . break isSpace
+
+    takeRange (lb,ub) = maybe id (drop . pred) lb . maybe id take ub
+
+    -- syntax: [n-][m] with semantics "drop (n-1) . take m"
+    parseRange :: String -> Maybe (Maybe Int,Maybe Int)
+    parseRange s = case span isDigit s of
+                   (_, "") ->
+                       -- upper limit only
+                       Just (Nothing, bndRead s)
+                   (s1, '-' : s2)
+                    | all isDigit s2 ->
+                       Just (bndRead s1, bndRead s2)
+                   _ ->
+                       Nothing
+      where
+        bndRead x = if null x then Nothing else Just (read x)
+
+
+
+completeGhciCommand, completeMacro, completeIdentifier, completeModule,
+    completeSetModule, completeSeti, completeShowiOptions,
+    completeHomeModule, completeSetOptions, completeShowOptions,
+    completeHomeModuleOrFile, completeExpression, completeBreakpoint
+    :: GhciMonad m => CompletionFunc m
+
+-- | Provide completions for last word in a given string.
+--
+-- Takes a tuple of two strings.  First string is a reversed line to be
+-- completed.  Second string is likely unused, 'completeCmd' always passes an
+-- empty string as second item in tuple.
+ghciCompleteWord :: CompletionFunc GHCi
+ghciCompleteWord line@(left,_) = case firstWord of
+    -- If given string starts with `:` colon, and there is only one following
+    -- word then provide REPL command completions.  If there is more than one
+    -- word complete either filename or builtin ghci commands or macros.
+    ':':cmd     | null rest     -> completeGhciCommand line
+                | otherwise     -> do
+                        completion <- lookupCompletion cmd
+                        completion line
+    -- If given string starts with `import` keyword provide module name
+    -- completions
+    "import"    -> completeModule line
+    -- otherwise provide identifier completions
+    _           -> completeExpression line
+  where
+    (firstWord,rest) = break isSpace $ dropWhile isSpace $ reverse left
+    lookupCompletion ('!':_) = return completeFilename
+    lookupCompletion c = do
+        maybe_cmd <- lookupCommand' c
+        case maybe_cmd of
+            Just cmd -> return (cmdCompletionFunc cmd)
+            Nothing  -> return completeFilename
+
+completeGhciCommand = wrapCompleter " " $ \w -> do
+  macros <- ghci_macros <$> getGHCiState
+  cmds   <- ghci_commands `fmap` getGHCiState
+  let macro_names = map (':':) . map cmdName $ macros
+  let command_names = map (':':) . map cmdName $ filter (not . cmdHidden) cmds
+  let{ candidates = case w of
+      ':' : ':' : _ -> map (':':) command_names
+      _ -> nub $ macro_names ++ command_names }
+  return $ filter (w `isPrefixOptOf`) candidates
+
+completeMacro = wrapIdentCompleter $ \w -> do
+  cmds <- ghci_macros <$> getGHCiState
+  return (filter (w `isPrefixOf`) (map cmdName cmds))
+
+completeIdentifier line@(left, _) =
+  -- Note: `left` is a reversed input
+  case left of
+    ('.':_)  -> wrapCompleter (specials ++ spaces) complete line
+               -- operator or qualification
+    (x:_) | isSymbolChar x -> wrapCompleter' (\c -> c `elem` (specials ++ spaces) || not (isSymbolChar c))
+                                 complete line         -- operator
+    _                      -> wrapIdentCompleter complete line
+  where
+    complete w = do
+      rdrs <- GHC.getRdrNamesInScope
+      dflags <- GHC.getSessionDynFlags
+      return (filter (w `isPrefixOf`) (map (showPpr dflags) rdrs))
+
+-- TAB-completion for the :break command.
+-- Build and return a list of breakpoint identifiers with a given prefix.
+-- See Note [Tab-completion for :break]
+completeBreakpoint = wrapCompleter spaces $ \w -> do          -- #3000
+    -- bid ~ breakpoint identifier = a name of a function that is
+    --       eligible to set a breakpoint.
+    let (mod_str, _, _) = splitIdent w
+    bids_mod_breaks <- bidsFromModBreaks mod_str
+    bids_inscopes <- bidsFromInscopes
+    pure $ nub $ filter (isPrefixOf w) $ bids_mod_breaks ++ bids_inscopes
+  where
+    -- Extract all bids from ModBreaks for a given module name prefix
+    bidsFromModBreaks :: GhciMonad m => String -> m [String]
+    bidsFromModBreaks mod_pref = do
+        imods <- interpretedHomeMods
+        let pmods = filter ((isPrefixOf mod_pref) . showModule) imods
+        nonquals <- case null mod_pref of
+          -- If the prefix is empty, then for functions declared in a module
+          -- in scope, don't qualify the function name.
+          -- (eg: `main` instead of `Main.main`)
+            True -> do
+                imports <- GHC.getContext
+                pure [ m | IIModule m <- imports]
+            False -> return []
+        bidss <- mapM (bidsByModule nonquals) pmods
+        pure $ concat bidss
+
+    -- Return a list of interpreted home modules
+    interpretedHomeMods :: GhciMonad m => m [Module]
+    interpretedHomeMods = do
+        graph <- GHC.getModuleGraph
+        let hmods = ms_mod <$> GHC.mgModSummaries graph
+        filterM GHC.moduleIsInterpreted hmods
+
+    -- Return all possible bids for a given Module
+    bidsByModule :: GhciMonad m => [ModuleName] -> Module -> m [String]
+    bidsByModule nonquals mod = do
+      (_, decls) <- getModBreak mod
+      let bids = nub $ declPath <$> elems decls
+      pure $ case (moduleName mod) `elem` nonquals of
+              True  -> bids
+              False -> (combineModIdent (showModule mod)) <$> bids
+
+    -- Extract all bids from all top-level identifiers in scope.
+    bidsFromInscopes :: GhciMonad m => m [String]
+    bidsFromInscopes = do
+        dflags <- getDynFlags
+        rdrs <- GHC.getRdrNamesInScope
+        inscopess <- mapM createInscope $ (showSDoc dflags . ppr) <$> rdrs
+        imods <- interpretedHomeMods
+        let topLevels = filter ((`elem` imods) . snd) $ concat inscopess
+        bidss <- mapM (addNestedDecls) topLevels
+        pure $ concat bidss
+
+    -- Return a list of (bid,module) for a single top-level in-scope identifier
+    createInscope :: GhciMonad m => String -> m [(String, Module)]
+    createInscope str_rdr = do
+        names <- GHC.parseName str_rdr
+        pure $ map (str_rdr, ) $ NE.toList $ GHC.nameModule <$> names
+
+    -- For every top-level identifier in scope, add the bids of the nested
+    -- declarations. See Note [Field modBreaks_decls] in GHC.ByteCode.Types
+    addNestedDecls :: GhciMonad m => (String, Module) -> m [String]
+    addNestedDecls (ident, mod) = do
+        (_, decls) <- getModBreak mod
+        let (mod_str, topLvl, _) = splitIdent ident
+            ident_decls = [ elm | elm@(el : _) <- elems decls, el == topLvl ]
+            bids = nub $ declPath <$> ident_decls
+        pure $ map (combineModIdent mod_str) bids
+
+completeModule = wrapIdentCompleterMod $ \w -> do
+  hsc_env <- GHC.getSession
+  let pkg_mods = allVisibleModules (hsc_units hsc_env)
+  loaded_mods <- liftM (map GHC.ms_mod_name) getLoadedModules
+  return $ filter (w `isPrefixOf`)
+        $ map (showPpr (hsc_dflags hsc_env)) $ loaded_mods ++ pkg_mods
+
+completeSetModule = wrapIdentCompleterWithModifier "+-" $ \m w -> do
+  hsc_env <- GHC.getSession
+  modules <- case m of
+    Just '-' -> do
+      imports <- GHC.getContext
+      return $ map iiModuleName imports
+    _ -> do
+      let pkg_mods = allVisibleModules (hsc_units hsc_env)
+      loaded_mods <- liftM (map GHC.ms_mod_name) getLoadedModules
+      return $ loaded_mods ++ pkg_mods
+  return $ filter (w `isPrefixOf`) $ map (showPpr (hsc_dflags hsc_env)) modules
+
+completeHomeModule = wrapIdentCompleterMod listHomeModules
+
+listHomeModules :: GHC.GhcMonad m => String -> m [String]
+listHomeModules w = do
+    g <- GHC.getModuleGraph
+    let home_mods = map GHC.ms_mod_name (GHC.mgModSummaries g)
+    dflags <- getDynFlags
+    return $ sort $ filter (w `isPrefixOf`)
+            $ map (showPpr dflags) home_mods
+
+completeSetOptions = wrapCompleter flagWordBreakChars $ \w -> do
+  return (filter (w `isPrefixOf`) opts)
+    where opts = "args":"prog":"prompt":"prompt-cont":"prompt-function":
+                 "prompt-cont-function":"editor":"stop":flagList
+          flagList = map NE.head $ NE.group $ sort allNonDeprecatedFlags
+
+completeSeti = wrapCompleter flagWordBreakChars $ \w -> do
+  return (filter (w `isPrefixOf`) flagList)
+    where flagList = map NE.head $ NE.group $ sort allNonDeprecatedFlags
+
+completeShowOptions = wrapCompleter flagWordBreakChars $ \w -> do
+  return (filter (w `isPrefixOf`) opts)
+    where opts = ["args", "prog", "editor", "stop",
+                     "modules", "bindings", "linker", "breaks",
+                     "context", "packages", "paths", "language", "imports"]
+
+completeShowiOptions = wrapCompleter flagWordBreakChars $ \w -> do
+  return (filter (w `isPrefixOf`) ["language"])
+
+completeHomeModuleOrFile = completeWord Nothing filenameWordBreakChars
+                $ unionComplete (fmap (map simpleCompletion) . listHomeModules)
+                            listFiles
+
+unionComplete :: Monad m => (a -> m [b]) -> (a -> m [b]) -> a -> m [b]
+unionComplete f1 f2 line = do
+  cs1 <- f1 line
+  cs2 <- f2 line
+  return (cs1 ++ cs2)
+
+wrapCompleter :: Monad m => String -> (String -> m [String]) -> CompletionFunc m
+wrapCompleter breakChars = wrapCompleter' (`elem` breakChars)
+
+wrapCompleter' :: Monad m => (Char -> Bool) -> (String -> m [String]) -> CompletionFunc m
+wrapCompleter' breakPred fun = completeWord' Nothing breakPred
+    $ fmap (map simpleCompletion . nubSort) . fun
+
+wrapIdentCompleter :: Monad m => (String -> m [String]) -> CompletionFunc m
+wrapIdentCompleter = wrapCompleter' word_break_chars_pred
+
+wrapIdentCompleterMod :: Monad m => (String -> m [String]) -> CompletionFunc m
+wrapIdentCompleterMod = wrapCompleter' go
+  where
+    go '.' = False -- Treated specially since it is a separator for module qualifiers
+    go c = word_break_chars_pred c
+
+wrapIdentCompleterWithModifier
+  :: Monad m
+  => String -> (Maybe Char -> String -> m [String]) -> CompletionFunc m
+wrapIdentCompleterWithModifier modifChars fun = completeWordWithPrev Nothing word_break_chars
+    $ \rest -> fmap (map simpleCompletion . nubSort) . fun (getModifier rest)
+ where
+  getModifier = find (`elem` modifChars)
+
+-- | Return a list of visible module names for autocompletion.
+-- (NB: exposed != visible)
+allVisibleModules :: UnitState -> [ModuleName]
+allVisibleModules unit_state = listVisibleModuleNames unit_state
+
+completeExpression = completeQuotedWord (Just '\\') "\"" listFiles
+                        completeIdentifier
+
+
+{-
+Note [Tab-completion for :break]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+In tab-completion for the `:break` command, only those
+identifiers should be shown, that are accepted in the
+`:break` command. Hence these identifiers must be
+
+- defined in an interpreted module
+- listed in a `ModBreaks` value as a possible breakpoint.
+
+The identifiers may be qualified or unqualified.
+
+To get all possible top-level breakpoints for tab-completion
+with the correct qualification do:
+
+1. Build a list called `bids_mod_breaks` of identifier names eligible
+for setting breakpoints: For every interpreted module with the
+correct module prefix read all identifier names from the `decls` field
+of the `ModBreaks` array.
+
+2. Build a list called `bids_inscopess` of identifiers in scope:
+Take all RdrNames in scope, and filter by interpreted modules.
+Fore each of these top-level identifiers add from the `ModBreaks`
+arrays the available identifiers of the nested functions.
+
+3.) Combine both lists, filter by the given prefix, and remove duplicates.
+-}
+
+-- -----------------------------------------------------------------------------
+-- commands for debugger
+
+sprintCmd, printCmd, forceCmd :: GHC.GhcMonad m => String -> m ()
+sprintCmd = pprintClosureCommand False False
+printCmd  = pprintClosureCommand True False
+forceCmd  = pprintClosureCommand False True
+
+stepCmd :: GhciMonad m => String -> m ()
+stepCmd arg = withSandboxOnly ":step" $ step arg
+  where
+  step []         = doContinue (const True) GHC.SingleStep
+  step expression = runStmt expression GHC.SingleStep >> return ()
+
+stepLocalCmd :: GhciMonad m => String -> m ()
+stepLocalCmd arg = withSandboxOnly ":steplocal" $ step arg
+  where
+  step expr
+   | not (null expr) = stepCmd expr
+   | otherwise = do
+      mb_span <- getCurrentBreakSpan
+      case mb_span of
+        Nothing  -> stepCmd []
+        Just (UnhelpfulSpan _) -> liftIO $ putStrLn (            -- #14690
+           ":steplocal is not possible." ++
+           "\nCannot determine current top-level binding after " ++
+           "a break on error / exception.\nUse :stepmodule.")
+        Just loc -> do
+           md <- fromMaybe (panic "stepLocalCmd") <$> getCurrentBreakModule
+           current_toplevel_decl <- enclosingTickSpan md loc
+           doContinue (`isSubspanOf` RealSrcSpan current_toplevel_decl Strict.Nothing) GHC.SingleStep
+
+stepModuleCmd :: GhciMonad m => String -> m ()
+stepModuleCmd arg = withSandboxOnly ":stepmodule" $ step arg
+  where
+  step expr
+   | not (null expr) = stepCmd expr
+   | otherwise = do
+      mb_span <- getCurrentBreakSpan
+      case mb_span of
+        Nothing  -> stepCmd []
+        Just pan -> do
+           let f some_span = srcSpanFileName_maybe pan == srcSpanFileName_maybe some_span
+           doContinue f GHC.SingleStep
+
+-- | Returns the span of the largest tick containing the srcspan given
+enclosingTickSpan :: GhciMonad m => Module -> SrcSpan -> m RealSrcSpan
+enclosingTickSpan _ (UnhelpfulSpan _) = panic "enclosingTickSpan UnhelpfulSpan"
+enclosingTickSpan md (RealSrcSpan src _) = do
+  ticks <- getTickArray md
+  let line = srcSpanStartLine src
+  massert (inRange (bounds ticks) line)
+  let enclosing_spans = [ pan | (_,pan) <- ticks ! line
+                               , realSrcSpanEnd pan >= realSrcSpanEnd src]
+  return . minimumBy leftmostLargestRealSrcSpan $ enclosing_spans
+ where
+
+leftmostLargestRealSrcSpan :: RealSrcSpan -> RealSrcSpan -> Ordering
+leftmostLargestRealSrcSpan = on compare realSrcSpanStart S.<> on (flip compare) realSrcSpanEnd
+
+traceCmd :: GhciMonad m => String -> m ()
+traceCmd arg
+  = withSandboxOnly ":trace" $ tr arg
+  where
+  tr []         = doContinue (const True) GHC.RunAndLogSteps
+  tr expression = runStmt expression GHC.RunAndLogSteps >> return ()
+
+continueCmd :: GhciMonad m => String -> m ()                  -- #19157
+continueCmd argLine = withSandboxOnly ":continue" $
+  case contSwitch (words argLine) of
+    Left sdoc   -> printForUser sdoc
+    Right mbCnt -> doContinue' (const True) GHC.RunToCompletion mbCnt
+    where
+      contSwitch :: [String] -> Either SDoc (Maybe Int)
+      contSwitch [ ] = Right Nothing
+      contSwitch [x] = Just <$> getIgnoreCount x
+      contSwitch  _  = Left $
+          text "After ':continue' only one ignore count is allowed"
+
+doContinue :: GhciMonad m => (SrcSpan -> Bool) -> SingleStep -> m ()
+doContinue pre step = doContinue' pre step Nothing
+
+doContinue' :: GhciMonad m => (SrcSpan -> Bool) -> SingleStep -> Maybe Int -> m ()
+doContinue' pre step mbCnt= do
+  runResult <- resume pre step mbCnt
+  _ <- afterRunStmt pre runResult
+  return ()
+
+abandonCmd :: GhciMonad m => String -> m ()
+abandonCmd = noArgs $ withSandboxOnly ":abandon" $ do
+  b <- GHC.abandon -- the prompt will change to indicate the new context
+  when (not b) $ liftIO $ putStrLn "There is no computation running."
+
+deleteCmd :: GhciMonad m => String -> m ()
+deleteCmd argLine = withSandboxOnly ":delete" $ do
+   deleteSwitch $ words argLine
+   where
+   deleteSwitch :: GhciMonad m => [String] -> m ()
+   deleteSwitch [] =
+      liftIO $ putStrLn "The delete command requires at least one argument."
+   -- delete all break points
+   deleteSwitch ("*":_rest) = discardActiveBreakPoints
+   deleteSwitch idents = do
+      mapM_ deleteOneBreak idents
+      where
+      deleteOneBreak :: GhciMonad m => String -> m ()
+      deleteOneBreak str
+         | all isDigit str = deleteBreak (read str)
+         | otherwise = return ()
+
+enableCmd :: GhciMonad m => String -> m ()
+enableCmd argLine = withSandboxOnly ":enable" $ do
+    enaDisaSwitch True $ words argLine
+
+disableCmd :: GhciMonad m => String -> m ()
+disableCmd argLine = withSandboxOnly ":disable" $ do
+    enaDisaSwitch False $ words argLine
+
+enaDisaSwitch :: GhciMonad m => Bool -> [String] -> m ()
+enaDisaSwitch enaDisa [] =
+    printForUser (text "The" <+> text strCmd <+>
+                  text "command requires at least one argument.")
+  where
+    strCmd = if enaDisa then ":enable" else ":disable"
+enaDisaSwitch enaDisa ("*" : _) = enaDisaAllBreaks enaDisa
+enaDisaSwitch enaDisa idents = do
+    mapM_ (enaDisaOneBreak enaDisa) idents
+  where
+    enaDisaOneBreak :: GhciMonad m => Bool -> String -> m ()
+    enaDisaOneBreak enaDisa strId = do
+      sdoc_loc <- checkEnaDisa enaDisa strId
+      case sdoc_loc of
+        Left sdoc -> printForUser sdoc
+        Right loc -> enaDisaAssoc enaDisa (read strId, loc)
+
+checkEnaDisa :: GhciMonad m => Bool -> String -> m (Either SDoc BreakLocation)
+checkEnaDisa enaDisa strId = do
+    sdoc_loc <- getBreakLoc strId
+    pure $ sdoc_loc >>= checkEnaDisaState enaDisa strId
+
+getBreakLoc :: GhciMonad m => String -> m (Either SDoc BreakLocation)
+getBreakLoc strId = do
+    st <- getGHCiState
+    case readMaybe strId >>= flip IntMap.lookup (breaks st) of
+      Nothing -> return $ Left (text "Breakpoint" <+> text strId <+>
+                                text "not found")
+      Just loc -> return $ Right loc
+
+checkEnaDisaState :: Bool -> String -> BreakLocation -> Either SDoc BreakLocation
+checkEnaDisaState enaDisa strId loc = do
+    if breakEnabled loc == enaDisa
+    then Left $
+        text "Breakpoint" <+> text strId <+> text "already in desired state"
+    else Right loc
+
+enaDisaAssoc :: GhciMonad m => Bool -> (Int, BreakLocation) -> m ()
+enaDisaAssoc enaDisa (intId, loc) = do
+    st <- getGHCiState
+    newLoc <- turnBreakOnOff enaDisa loc
+    let new_breaks = IntMap.insert intId newLoc (breaks st)
+    setGHCiState $ st { breaks = new_breaks }
+
+enaDisaAllBreaks :: GhciMonad m => Bool -> m()
+enaDisaAllBreaks enaDisa = do
+    st <- getGHCiState
+    mapM_ (enaDisaAssoc enaDisa) $ IntMap.assocs $ breaks st
+
+historyCmd :: GHC.GhcMonad m => String -> m ()
+historyCmd arg
+  | null arg        = history 20
+  | all isDigit arg = history (read arg)
+  | otherwise       = liftIO $ putStrLn "Syntax:  :history [num]"
+  where
+  history num = do
+    resumes <- GHC.getResumeContext
+    case resumes of
+      [] -> liftIO $ putStrLn "Not stopped at a breakpoint"
+      (r:_) -> do
+        let hist = GHC.resumeHistory r
+            (took,rest) = splitAt num hist
+        case hist of
+          [] -> liftIO $ putStrLn $
+                   "Empty history. Perhaps you forgot to use :trace?"
+          _  -> do
+                 pans <- mapM GHC.getHistorySpan took
+                 let nums  = map (printf "-%-3d:") [(1::Int)..]
+                     names = map GHC.historyEnclosingDecls took
+                 printForUser (vcat(zipWith3
+                                 (\x y z -> x <+> y <+> z)
+                                 (map text nums)
+                                 (map (bold . hcat . punctuate colon . map text) names)
+                                 (map (parens . ppr) pans)))
+                 liftIO $ putStrLn $ if null rest then "<end of history>" else "..."
+
+bold :: SDoc -> SDoc
+bold c | do_bold   = text start_bold <> c <> text end_bold
+       | otherwise = c
+
+ignoreCmd  :: GhciMonad m => String -> m ()                     -- #19157
+ignoreCmd argLine = withSandboxOnly ":ignore" $ do
+    result <- ignoreSwitch (words argLine)
+    case result of
+      Left sdoc -> printForUser sdoc
+      Right (loc, count)   -> do
+        let breakInfo = GHC.BreakInfo (breakModule loc) (breakTick loc)
+        setupBreakpoint breakInfo count
+
+ignoreSwitch :: GhciMonad m => [String] -> m (Either SDoc (BreakLocation, Int))
+ignoreSwitch [break, count] = do
+    sdoc_loc <- getBreakLoc break
+    pure $ (,) <$> sdoc_loc <*> getIgnoreCount count
+ignoreSwitch _ = pure $ Left $ text "Syntax:  :ignore <breaknum> <count>"
+
+getIgnoreCount :: String -> Either SDoc Int
+getIgnoreCount str =
+    case readMaybe str of
+      Nothing              -> Left $ sdocIgnore <+> "is not numeric"
+      Just cnt | cnt < 0   -> Left $ sdocIgnore <+> "must be >= 0"
+               | otherwise -> Right cnt
+    where
+      sdocIgnore = text "Ignore count" <+> quotes (text str)
+
+setupBreakpoint :: GhciMonad m => GHC.BreakInfo -> Int -> m()
+setupBreakpoint loc count = do
+    hsc_env <- GHC.getSession
+    GHC.setupBreakpoint hsc_env loc count
+
+backCmd :: GhciMonad m => String -> m ()
+backCmd arg
+  | null arg        = back 1
+  | all isDigit arg = back (read arg)
+  | otherwise       = liftIO $ putStrLn "Syntax:  :back [num]"
+  where
+  back num = withSandboxOnly ":back" $ do
+      (names, _, pan, _) <- GHC.back num
+      printForUser $ text "Logged breakpoint at" <+> ppr pan
+      printTypeOfNames names
+       -- run the command set with ":set stop <cmd>"
+      st <- getGHCiState
+      enqueueCommands [stop st]
+
+forwardCmd :: GhciMonad m => String -> m ()
+forwardCmd arg
+  | null arg        = forward 1
+  | all isDigit arg = forward (read arg)
+  | otherwise       = liftIO $ putStrLn "Syntax:  :forward [num]"
+  where
+  forward num = withSandboxOnly ":forward" $ do
+      (names, ix, pan, _) <- GHC.forward num
+      printForUser $ (if (ix == 0)
+                        then text "Stopped at"
+                        else text "Logged breakpoint at") <+> ppr pan
+      printTypeOfNames names
+       -- run the command set with ":set stop <cmd>"
+      st <- getGHCiState
+      enqueueCommands [stop st]
+
+-- handle the "break" command
+breakCmd :: GhciMonad m => String -> m ()
+breakCmd argLine = withSandboxOnly ":break" $ breakSwitch $ words argLine
+
+breakSwitch :: GhciMonad m => [String] -> m ()
+breakSwitch [] = do
+   liftIO $ putStrLn "The break command requires at least one argument."
+breakSwitch (arg1:rest)
+   | looksLikeModuleName arg1 && not (null rest) = do
+        md <- wantInterpretedModule arg1
+        breakByModule md rest
+   | all isDigit arg1 = do
+        imports <- GHC.getContext
+        case iiModules imports of
+           (mn : _) -> do
+              md <- lookupModuleName mn
+              breakByModuleLine md (read arg1) rest
+           [] -> do
+              liftIO $ putStrLn "No modules are loaded with debugging support."
+   | otherwise = do -- try parsing it as an identifier
+        breakById arg1
+
+breakByModule :: GhciMonad m => Module -> [String] -> m ()
+breakByModule md (arg1:rest)
+   | all isDigit arg1 = do  -- looks like a line number
+        breakByModuleLine md (read arg1) rest
+breakByModule _ _
+   = breakSyntax
+
+breakByModuleLine :: GhciMonad m => Module -> Int -> [String] -> m ()
+breakByModuleLine md line args
+   | [] <- args = findBreakAndSet md $ maybeToList . findBreakByLine line
+   | [col] <- args, all isDigit col =
+        findBreakAndSet md $ maybeToList . findBreakByCoord Nothing (line, read col)
+   | otherwise = breakSyntax
+
+-- Set a breakpoint for an identifier
+-- See Note [Setting Breakpoints by Id]
+breakById :: GhciMonad m => String -> m ()                          -- #3000
+breakById inp = do
+    let (mod_str, top_level, fun_str) = splitIdent inp
+        mod_top_lvl = combineModIdent mod_str top_level
+    mb_mod <- catch (lookupModuleInscope mod_top_lvl)
+                    (\(_ :: SomeException) -> lookupModuleInGraph mod_str)
+      -- If the top-level name is not in scope, `lookupModuleInscope` will
+      -- throw an exception, then lookup the module name in the module graph.
+    mb_err_msg <- validateBP mod_str fun_str mb_mod
+    case mb_err_msg of
+        Just err_msg -> printForUser $
+          text "Cannot set breakpoint on" <+> quotes (text inp)
+          <> text ":" <+> err_msg
+        Nothing -> do
+          -- No errors found, go and set the breakpoint
+          mb_mod_info  <- GHC.getModuleInfo $ fromJust mb_mod
+          let modBreaks = case mb_mod_info of
+                (Just mod_info) -> GHC.modInfoModBreaks mod_info
+                Nothing         -> emptyModBreaks
+          findBreakAndSet (fromJust mb_mod) $ findBreakForBind fun_str modBreaks
+  where
+    -- Try to lookup the module for an identifier that is in scope.
+    -- `parseName` throws an exception, if the identifier is not in scope
+    lookupModuleInscope :: GhciMonad m => String -> m (Maybe Module)
+    lookupModuleInscope mod_top_lvl = do
+        names <- GHC.parseName mod_top_lvl
+        pure $ Just $ NE.head $ GHC.nameModule <$> names
+
+    -- Lookup the Module of a module name in the module graph
+    lookupModuleInGraph :: GhciMonad m => String -> m (Maybe Module)
+    lookupModuleInGraph mod_str = do
+        graph <- GHC.getModuleGraph
+        let hmods = ms_mod <$> GHC.mgModSummaries graph
+        pure $ find ((== mod_str) . showModule) hmods
+
+    -- Check validity of an identifier to set a breakpoint:
+    --  1. The module of the identifier must exist
+    --  2. the identifier must be in an interpreted module
+    --  3. the ModBreaks array for module `mod` must have an entry
+    --     for the function
+    validateBP :: GhciMonad m => String -> String -> Maybe Module
+                       -> m (Maybe SDoc)
+    validateBP mod_str fun_str Nothing = pure $ Just $ quotes (text
+        (combineModIdent mod_str (Prelude.takeWhile (/= '.') fun_str)))
+        <+> text "not in scope"
+    validateBP _ "" (Just _) = pure $ Just $ text "Function name is missing"
+    validateBP _ fun_str (Just modl) = do
+        isInterpr <- GHC.moduleIsInterpreted modl
+        (_, decls) <- getModBreak modl
+        mb_err_msg <- case isInterpr of
+          False -> pure $ Just $ text "Module" <+> quotes (ppr modl)
+                        <+> text "is not interpreted"
+          True -> case fun_str `elem` (declPath <$> elems decls) of
+                False -> pure $ Just $
+                   text "No breakpoint found for" <+> quotes (text fun_str)
+                   <+> "in module" <+> quotes (ppr modl)
+                True  -> pure Nothing
+        pure mb_err_msg
+
+breakSyntax :: a
+breakSyntax = throwGhcException $ CmdLineError ("Syntax: :break [<mod>.]<func>[.<func>]\n"
+                                             ++ "        :break [<mod>] <line> [<column>]")
+
+findBreakAndSet :: GhciMonad m
+                => Module -> (TickArray -> [(Int, RealSrcSpan)]) -> m ()
+findBreakAndSet md lookupTickTree = do
+   tickArray <- getTickArray md
+   case lookupTickTree tickArray of
+      []  -> liftIO $ putStrLn $ "No breakpoints found at that location."
+      some -> mapM_ breakAt some
+ where
+   breakAt (tick, pan) = do
+         setBreakFlag md tick True
+         (alreadySet, nm) <-
+               recordBreak $ BreakLocation
+                       { breakModule = md
+                       , breakLoc = RealSrcSpan pan Strict.Nothing
+                       , breakTick = tick
+                       , onBreakCmd = ""
+                       , breakEnabled = True
+                       }
+         printForUser $
+            text "Breakpoint " <> ppr nm <>
+            if alreadySet
+               then text " was already set at " <> ppr pan
+               else text " activated at " <> ppr pan
+
+-- When a line number is specified, the current policy for choosing
+-- the best breakpoint is this:
+--    - the leftmost complete subexpression on the specified line, or
+--    - the leftmost subexpression starting on the specified line, or
+--    - the rightmost subexpression enclosing the specified line
+--
+findBreakByLine :: Int -> TickArray -> Maybe (BreakIndex,RealSrcSpan)
+findBreakByLine line arr
+  | not (inRange (bounds arr) line) = Nothing
+  | otherwise =
+    listToMaybe (sortBy (leftmostLargestRealSrcSpan `on` snd)  comp)   `mplus`
+    listToMaybe (sortBy (compare `on` snd) incomp) `mplus`
+    listToMaybe (sortBy (flip compare `on` snd) ticks)
+  where
+        ticks = arr ! line
+
+        starts_here = [ (ix,pan) | (ix, pan) <- ticks,
+                        GHC.srcSpanStartLine pan == line ]
+
+        (comp, incomp) = partition ends_here starts_here
+            where ends_here (_,pan) = GHC.srcSpanEndLine pan == line
+
+-- The aim is to find the breakpoints for all the RHSs of the
+-- equations corresponding to a binding.  So we find all breakpoints
+-- for
+--   (a) this binder only (it maybe a top-level or a nested declaration)
+--   (b) that do not have an enclosing breakpoint
+findBreakForBind :: String -> GHC.ModBreaks -> TickArray
+                 -> [(BreakIndex,RealSrcSpan)]
+findBreakForBind str_name modbreaks _ = filter (not . enclosed) ticks
+  where
+    ticks = [ (index, span)
+            | (index, decls) <- assocs (GHC.modBreaks_decls modbreaks),
+              str_name == declPath decls,
+              RealSrcSpan span _ <- [GHC.modBreaks_locs modbreaks ! index] ]
+    enclosed (_,sp0) = any subspan ticks
+      where subspan (_,sp) = sp /= sp0 &&
+                         realSrcSpanStart sp <= realSrcSpanStart sp0 &&
+                         realSrcSpanEnd sp0 <= realSrcSpanEnd sp
+
+findBreakByCoord :: Maybe FastString -> (Int,Int) -> TickArray
+                 -> Maybe (BreakIndex,RealSrcSpan)
+findBreakByCoord mb_file (line, col) arr
+  | not (inRange (bounds arr) line) = Nothing
+  | otherwise =
+    listToMaybe (sortBy (flip compare `on` snd) contains ++
+                 sortBy (compare `on` snd) after_here)
+  where
+        ticks = arr ! line
+
+        -- the ticks that span this coordinate
+        contains = [ tick | tick@(_,pan) <- ticks, RealSrcSpan pan Strict.Nothing `spans` (line,col),
+                            is_correct_file pan ]
+
+        is_correct_file pan
+                 | Just f <- mb_file = GHC.srcSpanFile pan == f
+                 | otherwise         = True
+
+        after_here = [ tick | tick@(_,pan) <- ticks,
+                              GHC.srcSpanStartLine pan == line,
+                              GHC.srcSpanStartCol pan >= col ]
+
+-- For now, use ANSI bold on terminals that we know support it.
+-- Otherwise, we add a line of carets under the active expression instead.
+-- In particular, on Windows and when running the testsuite (which sets
+-- TERM to vt100 for other reasons) we get carets.
+-- We really ought to use a proper termcap/terminfo library.
+do_bold :: Bool
+do_bold = (`isPrefixOf` unsafePerformIO mTerm) `any` ["xterm", "linux"]
+    where mTerm = System.Environment.getEnv "TERM"
+                  `catchIO` \_ -> return "TERM not set"
+
+start_bold :: String
+start_bold = "\ESC[1m"
+end_bold :: String
+end_bold   = "\ESC[0m"
+
+{-
+Note [Setting Breakpoints by Id]
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+To set a breakpoint first check whether a ModBreaks array contains a
+breakpoint with the given function name:
+In `:break M.foo` `M` may be a module name or a local alias of an import
+statement. To lookup a breakpoint in the ModBreaks, the effective module
+name is needed. Even if a module called `M` exists, `M` may still be
+a local alias. To get the module name, parse the top-level identifier with
+`GHC.parseName`. If this succeeds, extract the module name from the
+returned value. If it fails, catch the exception and assume `M` is a real
+module name.
+
+The names of nested functions are stored in `ModBreaks.modBreaks_decls`.
+-}
+
+-----------------------------------------------------------------------------
+-- :where
+
+whereCmd :: GHC.GhcMonad m => String -> m ()
+whereCmd = noArgs $ do
+  mstrs <- getCallStackAtCurrentBreakpoint
+  case mstrs of
+    Nothing -> return ()
+    Just strs -> liftIO $ putStrLn (renderStack strs)
+
+-----------------------------------------------------------------------------
+-- :list
+
+listCmd :: GhciMonad m => String -> m ()
+listCmd "" = do
+   mb_span <- getCurrentBreakSpan
+   case mb_span of
+      Nothing ->
+          printForUser $ text "Not stopped at a breakpoint; nothing to list"
+      Just (RealSrcSpan pan _) ->
+          listAround pan True
+      Just pan@(UnhelpfulSpan _) ->
+          do resumes <- GHC.getResumeContext
+             case resumes of
+                 [] -> panic "No resumes"
+                 (r:_) ->
+                     do let traceIt = case GHC.resumeHistory r of
+                                      [] -> text "rerunning with :trace,"
+                                      _ -> empty
+                            doWhat = traceIt <+> text ":back then :list"
+                        printForUser (text "Unable to list source for" <+>
+                                      ppr pan
+                                   $$ text "Try" <+> doWhat)
+listCmd str = list2 (words str)
+
+list2 :: GhciMonad m => [String] -> m ()
+list2 [arg] | all isDigit arg = do
+    imports <- GHC.getContext
+    case iiModules imports of
+        [] -> liftIO $ putStrLn "No module to list"
+        (mn : _) -> do
+          md <- lookupModuleName mn
+          listModuleLine md (read arg)
+list2 [arg1,arg2] | looksLikeModuleName arg1, all isDigit arg2 = do
+        md <- wantInterpretedModule arg1
+        listModuleLine md (read arg2)
+list2 [arg] = do
+        wantNameFromInterpretedModule noCanDo arg $ \name -> do
+        let loc = GHC.srcSpanStart (GHC.nameSrcSpan name)
+        case loc of
+            RealSrcLoc l _ ->
+               do tickArray <- assert (isExternalName name) $
+                               getTickArray (GHC.nameModule name)
+                  let mb_span = findBreakByCoord (Just (GHC.srcLocFile l))
+                                        (GHC.srcLocLine l, GHC.srcLocCol l)
+                                        tickArray
+                  case mb_span of
+                    Nothing       -> listAround (realSrcLocSpan l) False
+                    Just (_, pan) -> listAround pan False
+            UnhelpfulLoc _ ->
+                  noCanDo name $ text "can't find its location: " <>
+                                 ppr loc
+    where
+        noCanDo n why = printForUser $
+            text "cannot list source code for " <> ppr n <> text ": " <> why
+list2  _other =
+        liftIO $ putStrLn "syntax:  :list [<line> | <module> <line> | <identifier>]"
+
+listModuleLine :: GHC.GhcMonad m => Module -> Int -> m ()
+listModuleLine modl line = do
+   graph <- GHC.getModuleGraph
+   let this = GHC.mgLookupModule graph modl
+   case this of
+     Nothing -> panic "listModuleLine"
+     Just summ -> do
+           let filename = expectJust "listModuleLine" (ml_hs_file (GHC.ms_location summ))
+               loc = mkRealSrcLoc (mkFastString (filename)) line 0
+           listAround (realSrcLocSpan loc) False
+
+-- | list a section of a source file around a particular SrcSpan.
+-- If the highlight flag is True, also highlight the span using
+-- start_bold\/end_bold.
+
+-- GHC files are UTF-8, so we can implement this by:
+-- 1) read the file in as a BS and syntax highlight it as before
+-- 2) convert the BS to String using utf-string, and write it out.
+-- It would be better if we could convert directly between UTF-8 and the
+-- console encoding, of course.
+listAround :: MonadIO m => RealSrcSpan -> Bool -> m ()
+listAround pan do_highlight = do
+      contents <- liftIO $ BS.readFile (unpackFS file)
+      -- Drop carriage returns to avoid duplicates, see #9367.
+      let ls  = BS.split '\n' $ BS.filter (/= '\r') contents
+          ls' = take (line2 - line1 + 1 + pad_before + pad_after) $
+                        drop (line1 - 1 - pad_before) $ ls
+          fst_line = max 1 (line1 - pad_before)
+          line_nos = [ fst_line .. ]
+
+          highlighted | do_highlight = zipWith highlight line_nos ls'
+                      | otherwise    = [\p -> BS.concat[p,l] | l <- ls']
+
+          bs_line_nos = [ BS.pack (show l ++ "  ") | l <- line_nos ]
+          prefixed = zipWith ($) highlighted bs_line_nos
+          output   = BS.intercalate (BS.pack "\n") prefixed
+
+      let utf8Decoded = utf8DecodeByteString output
+      liftIO $ putStrLn utf8Decoded
+  where
+        file  = GHC.srcSpanFile pan
+        line1 = GHC.srcSpanStartLine pan
+        col1  = GHC.srcSpanStartCol pan - 1
+        line2 = GHC.srcSpanEndLine pan
+        col2  = GHC.srcSpanEndCol pan - 1
+
+        pad_before | line1 == 1 = 0
+                   | otherwise  = 1
+        pad_after = 1
+
+        highlight | do_bold   = highlight_bold
+                  | otherwise = highlight_carets
+
+        highlight_bold no line prefix
+          | no == line1 && no == line2
+          = let (a,r) = BS.splitAt col1 line
+                (b,c) = BS.splitAt (col2-col1) r
+            in
+            BS.concat [prefix, a,BS.pack start_bold,b,BS.pack end_bold,c]
+          | no == line1
+          = let (a,b) = BS.splitAt col1 line in
+            BS.concat [prefix, a, BS.pack start_bold, b]
+          | no == line2
+          = let (a,b) = BS.splitAt col2 line in
+            BS.concat [prefix, a, BS.pack end_bold, b]
+          | otherwise   = BS.concat [prefix, line]
+
+        highlight_carets no line prefix
+          | no == line1 && no == line2
+          = BS.concat [prefix, line, nl, indent, BS.replicate col1 ' ',
+                                         BS.replicate (col2-col1) '^']
+          | no == line1
+          = BS.concat [indent, BS.replicate (col1 - 2) ' ', BS.pack "vv", nl,
+                                         prefix, line]
+          | no == line2
+          = BS.concat [prefix, line, nl, indent, BS.replicate col2 ' ',
+                                         BS.pack "^^"]
+          | otherwise   = BS.concat [prefix, line]
+         where
+           indent = BS.pack ("  " ++ replicate (length (show no)) ' ')
+           nl = BS.singleton '\n'
+
+
+-- --------------------------------------------------------------------------
+-- Tick arrays
+
+getTickArray :: GhciMonad m => Module -> m TickArray
+getTickArray modl = do
+   st <- getGHCiState
+   let arrmap = tickarrays st
+   case lookupModuleEnv arrmap modl of
+      Just arr -> return arr
+      Nothing  -> do
+        (ticks, _) <- getModBreak modl
+        let arr = mkTickArray (assocs ticks)
+        setGHCiState st{tickarrays = extendModuleEnv arrmap modl arr}
+        return arr
+
+discardTickArrays :: GhciMonad m => m ()
+discardTickArrays = modifyGHCiState (\st -> st {tickarrays = emptyModuleEnv})
+
+mkTickArray :: [(BreakIndex,SrcSpan)] -> TickArray
+mkTickArray ticks
+  = accumArray (flip (:)) [] (1, max_line)
+        [ (line, (nm,pan)) | (nm,RealSrcSpan pan _) <- ticks, line <- srcSpanLines pan ]
+    where
+        max_line = foldr max 0 [ GHC.srcSpanEndLine sp | (_, RealSrcSpan sp _) <- ticks ]
+        srcSpanLines pan = [ GHC.srcSpanStartLine pan ..  GHC.srcSpanEndLine pan ]
+
+-- don't reset the counter back to zero?
+discardActiveBreakPoints :: GhciMonad m => m ()
+discardActiveBreakPoints = do
+   st <- getGHCiState
+   mapM_ (turnBreakOnOff False) $ breaks st
+   setGHCiState $ st { breaks = IntMap.empty }
+
+discardInterfaceCache :: GhciMonad m => m ()
+discardInterfaceCache =
+   void (liftIO . iface_clearCache . ifaceCache =<< getGHCiState)
+
+clearHPTs :: GhciMonad m => m ()
+clearHPTs = do
+  let pruneHomeUnitEnv hme = hme { homeUnitEnv_hpt = emptyHomePackageTable }
+      discardMG hsc = hsc { hsc_mod_graph = GHC.emptyMG }
+  modifySession (discardMG . discardIC . hscUpdateHUG (unitEnv_map pruneHomeUnitEnv))
+
+
+-- The unused package warning doesn't make sense once the targets get out of
+-- sync with the package flags. See #21110
+-- Therefore if it's turned on, the warnings are issued until the module context
+-- changes (via :load or :cd), at which stage the package flags are not going to change
+-- but the loaded modules will probably not use all the specified packages so the
+-- warning becomes spurious. At that point the warning is silently disabled.
+disableUnusedPackages :: GhciMonad m => m ()
+disableUnusedPackages = newDynFlags False ["-Wno-unused-packages"]
+
+deleteBreak :: GhciMonad m => Int -> m ()
+deleteBreak identity = do
+   st <- getGHCiState
+   let oldLocations = breaks st
+   case IntMap.lookup identity oldLocations of
+       Nothing -> printForUser (text "Breakpoint" <+> ppr identity <+>
+                                text "does not exist")
+       Just loc -> do
+           _ <- (turnBreakOnOff False) loc
+           let rest = IntMap.delete identity oldLocations
+           setGHCiState $ st { breaks = rest }
+
+turnBreakOnOff :: GhciMonad m => Bool -> BreakLocation -> m BreakLocation
+turnBreakOnOff onOff loc
+  | onOff == breakEnabled loc = return loc
+  | otherwise = do
+      setBreakFlag (breakModule loc) (breakTick loc)  onOff
+      return loc { breakEnabled = onOff }
+
+getModBreak :: GHC.GhcMonad m
+            => Module -> m (Array Int SrcSpan, Array Int [String])
+getModBreak m = do
+   mod_info      <- fromMaybe (panic "getModBreak") <$> GHC.getModuleInfo m
+   let modBreaks  = GHC.modInfoModBreaks mod_info
+   let ticks      = GHC.modBreaks_locs  modBreaks
+   let decls      = GHC.modBreaks_decls modBreaks
+   return (ticks, decls)
+
+setBreakFlag :: GhciMonad m => Module -> Int -> Bool ->m ()
+setBreakFlag  md ix enaDisa = do
+  let enaDisaToCount True = breakOn
+      enaDisaToCount False = breakOff
+  setupBreakpoint (GHC.BreakInfo md ix) $ enaDisaToCount enaDisa
+
+-- ---------------------------------------------------------------------------
+-- User code exception handling
+
+-- This is the exception handler for exceptions generated by the
+-- user's code and exceptions coming from children sessions;
+-- it normally just prints out the exception.  The
+-- handler must be recursive, in case showing the exception causes
+-- more exceptions to be raised.
+--
+-- Bugfix: if the user closed stdout or stderr, the flushing will fail,
+-- raising another exception.  We therefore don't put the recursive
+-- handler around the flushing operation, so if stderr is closed
+-- GHCi will just die gracefully rather than going into an infinite loop.
+handler :: GhciMonad m => SomeException -> m Bool
+handler exception = do
+  flushInterpBuffers
+  withSignalHandlers $
+     ghciHandle handler (showException exception >> return False)
+
+showException :: MonadIO m => SomeException -> m ()
+showException se =
+  liftIO $ case fromException se of
+           -- omit the location for CmdLineError:
+           Just (CmdLineError s)    -> putException s
+           -- ditto:
+           Just other_ghc_ex        -> putException (show other_ghc_ex)
+           Nothing                  ->
+               case fromException se of
+               Just UserInterrupt -> putException "Interrupted."
+               _                  -> putException ("*** Exception: " ++ show se)
+  where
+    putException = hPutStrLn stderr
+
+failIfExprEvalMode :: GhciMonad m => m ()
+failIfExprEvalMode = do
+  s <- getGHCiState
+  when (ghc_e s) $
+    liftIO (exitWith (ExitFailure 1))
+
+-- | When in expression evaluation mode (ghc -e), we want to exit immediately.
+-- Otherwis, just print out the message.
+printErrAndMaybeExit :: (GhciMonad m, MonadIO m, HasLogger m) => SourceError -> m ()
+printErrAndMaybeExit = (>> failIfExprEvalMode) . printGhciException
+
+-----------------------------------------------------------------------------
+-- recursive exception handlers
+
+-- Don't forget to unblock async exceptions in the handler, or if we're
+-- in an exception loop (eg. let a = error a in a) the ^C exception
+-- may never be delivered.  Thanks to Marcin for pointing out the bug.
+
+ghciHandle :: (HasLogger m, ExceptionMonad m) => (SomeException -> m a) -> m a -> m a
+ghciHandle h m = mask $ \restore -> do
+                 -- Force dflags to avoid leaking the associated HscEnv
+                 !log <- getLogger
+                 catch (restore (GHC.prettyPrintGhcErrors log m)) $ \e -> restore (h e)
+
+ghciTry :: ExceptionMonad m => m a -> m (Either SomeException a)
+ghciTry m = fmap Right m `catch` \e -> return $ Left e
+
+tryBool :: ExceptionMonad m => m a -> m Bool
+tryBool m = do
+    r <- ghciTry m
+    case r of
+      Left _  -> return False
+      Right _ -> return True
+
+-- ----------------------------------------------------------------------------
+-- Utils
+
+lookupModule :: GHC.GhcMonad m => String -> m Module
+lookupModule mName = lookupModuleName (GHC.mkModuleName mName)
+
+lookupModuleName :: GHC.GhcMonad m => ModuleName -> m Module
+lookupModuleName mName = GHC.lookupQualifiedModule NoPkgQual mName
+
+isMainUnitModule :: Module -> Bool
+isMainUnitModule m = GHC.moduleUnit m == mainUnit
+
+showModule :: Module -> String
+showModule = moduleNameString . moduleName
+
+-- Return a String with the declPath of the function of a breakpoint.
+-- See Note [Field modBreaks_decls] in GHC.ByteCode.Types
+declPath :: [String] -> String
+declPath = intercalate "."
+
+-- | Optionally show a fixity declaration like @infixr 4 #@
+--
+-- We always display the fixity of terms with symbolic names (like <$>).
+-- For other terms we only display the fixity if it has been set to a
+-- value other than the default infixl 9.
+--
+-- We have no way of distinguishing between a fixity that has been
+-- manually set to infixl 9 and a fixity that has assumed infixl 9 as
+-- the default, so we choose to not display the fixity in both cases
+-- (for terms with non-symbolic names).
+--
+-- See #19200.
+showFixity :: TyThing -> Fixity -> SDoc
+showFixity thing fixity
+    | fixity /= GHC.defaultFixity || isSymOcc (getOccName thing)
+        = ppr fixity <+> pprInfixName (GHC.getName thing)
+    | otherwise = empty
+
+-- TODO: won't work if home dir is encoded.
+-- (changeDirectory may not work either in that case.)
+expandPath :: MonadIO m => String -> m String
+expandPath = liftIO . expandPathIO
+
+expandPathIO :: String -> IO String
+expandPathIO p =
+  case dropWhile isSpace p of
+   ('~':d) -> do
+        tilde <- getHomeDirectory -- will fail if HOME not defined
+        return (tilde ++ '/':d)
+   other ->
+        return other
+
+wantInterpretedModule :: GHC.GhcMonad m => String -> m Module
+wantInterpretedModule str = wantInterpretedModuleName (GHC.mkModuleName str)
+
+wantInterpretedModuleName :: GHC.GhcMonad m => ModuleName -> m Module
+wantInterpretedModuleName modname = do
+   modl <- lookupModuleName modname
+   let str = moduleNameString modname
+   home_unit <- hsc_home_unit <$> GHC.getSession
+   unless (isHomeModule home_unit modl) $
+      throwGhcException (CmdLineError ("module '" ++ str ++ "' is from another package;\nthis command requires an interpreted module"))
+   is_interpreted <- GHC.moduleIsInterpreted modl
+   when (not is_interpreted) $
+       throwGhcException (CmdLineError ("module '" ++ str ++ "' is not interpreted; try \':add *" ++ str ++ "' first"))
+   return modl
+
+wantNameFromInterpretedModule :: GHC.GhcMonad m
+                              => (Name -> SDoc -> m ())
+                              -> String
+                              -> (Name -> m ())
+                              -> m ()
+wantNameFromInterpretedModule noCanDo str and_then =
+  handleSourceError printGhciException $ do
+    n NE.:| _ <- GHC.parseName str
+    let modl = assert (isExternalName n) $ GHC.nameModule n
+    if not (GHC.isExternalName n)
+       then noCanDo n $ ppr n <>
+                        text " is not defined in an interpreted module"
+       else do
+    is_interpreted <- GHC.moduleIsInterpreted modl
+    if not is_interpreted
+       then noCanDo n $ text "module " <> ppr modl <>
+                        text " is not interpreted"
+       else and_then n
+
+clearCaches :: GhciMonad m => m ()
+clearCaches = discardActiveBreakPoints
+              >> discardInterfaceCache
+              >> disableUnusedPackages
+              >> clearHPTs
+
+
+
+-- Split up a string with an eventually qualified declaration name into 3 components
+--   1. module name
+--   2. top-level decl
+--   3. full-name of the eventually nested decl, but without module qualification
+-- eg  "foo"           = ("", "foo", "foo")
+--     "A.B.C.foo"     = ("A.B.C", "foo", "foo")
+--     "M.N.foo.bar"   = ("M.N", "foo", "foo.bar")
+splitIdent :: String -> (String, String, String)
+splitIdent [] = ("", "", "")
+splitIdent inp@(a : _)
+    | (isUpper a) = case fixs of
+        []            -> (inp, "", "")
+        (i1 : [] )    -> (upto i1, from i1, from i1)
+        (i1 : i2 : _) -> (upto i1, take (i2 - i1 - 1) (from i1), from i1)
+    | otherwise = case ixs of
+        []            -> ("", inp, inp)
+        (i1 : _)      -> ("", upto i1, inp)
+  where
+    ixs = elemIndices '.' inp        -- indices of '.' in whole input
+    fixs = dropWhile isNextUc ixs    -- indices of '.' in function names              --
+    isNextUc ix = isUpper $ safeInp !! (ix+1)
+    safeInp = inp ++ " "
+    upto i = take i inp
+    from i = drop (i + 1) inp
+
+-- Qualify an identifier name with a module name
+-- combineModIdent "A" "foo"  =  "A.foo"
+-- combineModIdent ""  "foo"  =  "foo"
+combineModIdent :: String -> String -> String
+combineModIdent mod ident
+          | null mod   = ident
+          | null ident = mod
+          | otherwise  = mod ++ "." ++ ident
diff --git a/src-bin-9.10/Clash/GHCi/UI/Exception.hs b/src-bin-9.10/Clash/GHCi/UI/Exception.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/GHCi/UI/Exception.hs
@@ -0,0 +1,142 @@
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE UndecidableInstances #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+module Clash.GHCi.UI.Exception(printGhciException, GHCiMessage(..)) where
+
+import GHC.Prelude
+
+import GHC.Driver.Config.Diagnostic
+import GHC.Driver.Errors
+import GHC.Driver.Errors.Types
+import GHC.Driver.Session
+
+import GHC.Iface.Errors.Ppr
+import GHC.Iface.Errors.Types
+
+import qualified GHC.LanguageExtensions as LangExt
+
+import GHC.Tc.Errors.Ppr
+import GHC.Tc.Errors.Types
+
+import GHC.Types.Error
+import GHC.Types.SourceError
+
+import GHC.Unit.State
+
+import GHC.Utils.Logger
+import GHC.Utils.Outputable
+
+import Control.Monad.IO.Class
+
+
+-- | Print the all diagnostics in a 'SourceError'.  Specialised for GHCi error reporting
+-- for some error messages.
+printGhciException :: (HasLogger m, MonadIO m, HasDynFlags m) => SourceError -> m ()
+printGhciException err = do
+  dflags <- getDynFlags
+  logger <- getLogger
+  let !diag_opts = initDiagOpts dflags
+      !print_config = initPrintConfig dflags
+  liftIO $ printMessages logger print_config diag_opts (GHCiMessage <$> (srcErrorMessages err))
+
+
+newtype GHCiMessage = GHCiMessage { _getGhciMessage :: GhcMessage }
+
+instance Diagnostic GHCiMessage where
+  type DiagnosticOpts GHCiMessage = DiagnosticOpts GhcMessage
+
+  diagnosticMessage opts (GHCiMessage msg) = ghciDiagnosticMessage opts msg
+
+  diagnosticReason (GHCiMessage msg) = diagnosticReason msg
+
+  diagnosticHints (GHCiMessage msg) = ghciDiagnosticHints msg
+
+  diagnosticCode (GHCiMessage msg)  = diagnosticCode msg
+
+
+-- | Modifications to hint messages which we want to display in GHCi.
+ghciDiagnosticHints :: GhcMessage -> [GhcHint]
+ghciDiagnosticHints msg = map modifyHintForGHCi (diagnosticHints msg)
+  where
+    modifyHintForGHCi :: GhcHint -> GhcHint
+    modifyHintForGHCi = \case
+      SuggestExtension extHint -> SuggestExtension $ modifyExtHintForGHCi extHint
+      hint -> hint
+    modifyExtHintForGHCi :: LanguageExtensionHint -> LanguageExtensionHint
+    modifyExtHintForGHCi = \case
+      SuggestSingleExtension    doc ext  -> SuggestSingleExtension    (suggestSetExt [ext] doc False) ext
+      SuggestExtensionInOrderTo doc ext  -> SuggestExtensionInOrderTo (suggestSetExt [ext] doc False) ext
+      SuggestAnyExtension       doc exts -> SuggestAnyExtension       (suggestSetExt exts  doc True ) exts
+      SuggestExtensions         doc exts -> SuggestExtensions         (suggestSetExt exts  doc False) exts
+    -- Suggest enabling extension with :set -X<ext>
+    -- SuggestAnyExtension will be on multiple lines so the user can select which to enable without editing
+    suggestSetExt :: [LangExt.Extension] -> SDoc -> Bool -> SDoc
+    suggestSetExt exts doc enable_any = doc $$ hang header 2 exts_cmds
+      where
+        header = text "You may enable" <+> which <+> text "language extension" <> plural exts <+> text "in GHCi with:"
+        which
+          | [ _ext ] <- exts
+          = text "this"
+          | otherwise
+          = if enable_any
+            then text "these"
+            else text "all of these"
+        exts_cmds
+          | enable_any
+          = vcat $ map (\ext -> text ":set -X" <> ppr ext) exts
+          | otherwise
+          = text ":set" <> hcat (map (\ext -> text " -X" <> ppr ext) exts)
+
+-- Modifications to error messages which we want to display in GHCi
+ghciDiagnosticMessage :: GhcMessageOpts -> GhcMessage -> DecoratedSDoc
+ghciDiagnosticMessage ghc_opts msg =
+  case msg of
+    GhcTcRnMessage tc_msg ->
+      case tcRnMessage (tcMessageOpts ghc_opts) tc_msg of
+        Nothing -> diagnosticMessage ghc_opts msg
+        Just sdoc -> sdoc
+    GhcDriverMessage  (DriverInterfaceError err) ->
+      case ghciInterfaceError err of
+        Just sdoc -> mkSimpleDecorated sdoc
+        Nothing -> diagnosticMessage ghc_opts msg
+    GhcDriverMessage {} -> diagnosticMessage ghc_opts msg
+    GhcPsMessage  {} -> diagnosticMessage ghc_opts msg
+    GhcDsMessage  {} -> diagnosticMessage ghc_opts msg
+    GhcUnknownMessage  {} -> diagnosticMessage ghc_opts msg
+  where
+    tcRnMessage tc_opts tc_msg =
+      case tc_msg of
+        TcRnInterfaceError err -> mkSimpleDecorated <$> (ghciInterfaceError err)
+        TcRnMessageWithInfo unit_state msg_with_info ->
+          case msg_with_info of
+           TcRnMessageDetailed err_info wrapped_msg
+             -> messageWithInfoDiagnosticMessage unit_state err_info
+                  (tcOptsShowContext tc_opts)
+                  <$> tcRnMessage tc_opts wrapped_msg
+        TcRnWithHsDocContext ctxt wrapped_msg ->
+          messageWithHsDocContext tc_opts ctxt <$> tcRnMessage tc_opts wrapped_msg
+        _ -> Nothing
+
+    opts = tcOptsIfaceOpts (tcMessageOpts ghc_opts)
+
+    ghciInterfaceError (Can'tFindInterface err looking_for) =
+      hangNotEmpty (lookingForHerald looking_for) 2 <$> ghciMissingInterfaceErrorDiagnostic err
+    ghciInterfaceError _ = Nothing
+
+    ghciMissingInterfaceErrorDiagnostic reason =
+      case reason of
+        CantFindErr us module_or_interface cfi -> Just (pprWithUnitState us $ cantFindErrorX pkg_hidden_hint may_show_locations module_or_interface cfi)
+        _ -> Nothing
+      where
+
+        may_show_locations = mayShowLocations ":set -v" (ifaceShowTriedFiles opts)
+
+        pkg_hidden_hint = pkgHiddenHint hidden_msg (ifaceBuildingCabalPackage opts)
+          where
+            hidden_msg pkg =
+              text "You can run" <+>
+              quotes (text ":set -package " <> ppr (unitPackageName pkg)) <+>
+              text "to expose it." $$
+              text "(Note: this unloads all the modules in the current scope.)"
diff --git a/src-bin-9.10/Clash/GHCi/UI/Info.hs b/src-bin-9.10/Clash/GHCi/UI/Info.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/GHCi/UI/Info.hs
@@ -0,0 +1,409 @@
+{-# LANGUAGE LambdaCase          #-}
+{-# LANGUAGE RankNTypes          #-}
+{-# LANGUAGE OverloadedStrings   #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE ViewPatterns        #-}
+
+{-# OPTIONS -fno-warn-name-shadowing #-}
+
+-- | Get information on modules, expressions, and identifiers
+module Clash.GHCi.UI.Info
+    ( ModInfo(..)
+    , SpanInfo(..)
+    , spanInfoFromRealSrcSpan
+    , collectInfo
+    , findLoc
+    , findNameUses
+    , findType
+    , getModInfo
+    ) where
+
+import           Control.Exception
+import           Control.Monad
+import           Control.Monad.Catch as MC
+import           Control.Monad.Trans.Class
+import           Control.Monad.Trans.Except
+import           Control.Monad.Trans.Maybe
+import           Data.Data
+import           Data.Function
+import           Data.List (find, sortBy)
+import           Data.Map.Strict   (Map)
+import qualified Data.Map.Strict   as M
+import           Data.Maybe
+import           Data.Time
+import           Prelude           hiding (mod,(<>))
+import           System.Directory
+
+import           GHC.Hs.Syn.Type
+import           GHC.Driver.Session (HasDynFlags(..))
+import           GHC.Data.FastString
+import           GHC
+import           GHC.Driver.Monad
+import           GHC.Driver.Env
+import           GHC.Driver.Ppr
+import           GHC.Types.Name
+import           GHC.Types.Name.Reader
+import           GHC.Types.Name.Set
+import           GHC.Utils.Outputable
+import           GHC.Types.SrcLoc
+import           GHC.Types.Var
+import qualified GHC.Data.Strict as Strict
+
+-- | Info about a module. This information is generated every time a
+-- module is loaded.
+data ModInfo = ModInfo
+    { modinfoSummary    :: !ModSummary
+      -- ^ Summary generated by GHC. Can be used to access more
+      -- information about the module.
+    , modinfoSpans      :: [SpanInfo]
+      -- ^ Generated set of information about all spans in the
+      -- module that correspond to some kind of identifier for
+      -- which there will be type info and/or location info.
+    , modinfoRdrEnv     :: !(Strict.Maybe IfGlobalRdrEnv)
+      -- ^ What's in scope in the module.
+    , modinfoLastUpdate :: !UTCTime
+      -- ^ The timestamp of the file used to generate this record.
+    }
+
+-- | Type of some span of source code. Most of these fields are
+-- unboxed but Haddock doesn't show that.
+data SpanInfo = SpanInfo
+    { spaninfoSrcSpan   :: {-# UNPACK #-} !RealSrcSpan
+      -- ^ The span we associate information with
+    , spaninfoType      :: !(Maybe Type)
+      -- ^ The 'Type' associated with the span
+    , spaninfoVar       :: !(Maybe Id)
+      -- ^ The actual 'Var' associated with the span, if
+      -- any. This can be useful for accessing a variety of
+      -- information about the identifier such as module,
+      -- locality, definition location, etc.
+    }
+
+instance Outputable SpanInfo where
+  ppr (SpanInfo s t i) = ppr s <+> ppr t <+> ppr i
+
+-- | Test whether second span is contained in (or equal to) first span.
+-- This is basically 'containsSpan' for 'SpanInfo'
+containsSpanInfo :: SpanInfo -> SpanInfo -> Bool
+containsSpanInfo = containsSpan `on` spaninfoSrcSpan
+
+-- | Filter all 'SpanInfo' which are contained in 'SpanInfo'
+spaninfosWithin :: [SpanInfo] -> SpanInfo -> [SpanInfo]
+spaninfosWithin spans' si = filter (si `containsSpanInfo`) spans'
+
+-- | Construct a 'SpanInfo' from a 'RealSrcSpan' and optionally a
+-- 'Type' and an 'Id' (for 'spaninfoType' and 'spaninfoVar'
+-- respectively)
+spanInfoFromRealSrcSpan :: RealSrcSpan -> Maybe Type -> Maybe Id -> SpanInfo
+spanInfoFromRealSrcSpan spn mty mvar =
+    SpanInfo spn mty mvar
+
+-- | Convenience wrapper around 'spanInfoFromRealSrcSpan' which needs
+-- only a 'RealSrcSpan'
+spanInfoFromRealSrcSpan' :: RealSrcSpan -> SpanInfo
+spanInfoFromRealSrcSpan' s = spanInfoFromRealSrcSpan s Nothing Nothing
+
+-- | Convenience wrapper around 'srcSpanFile' which results in a 'FilePath'
+srcSpanFilePath :: RealSrcSpan -> FilePath
+srcSpanFilePath = unpackFS . srcSpanFile
+
+-- | Try to find the location of the given identifier at the given
+-- position in the module.
+findLoc :: GhcMonad m
+        => Map ModuleName ModInfo
+        -> RealSrcSpan
+        -> String
+        -> ExceptT SDoc m (ModInfo,Name,SrcSpan)
+findLoc infos span0 string = do
+    name  <- maybeToExceptT "Couldn't guess that module name. Does it exist?" $
+             guessModule infos (srcSpanFilePath span0)
+
+    info  <- maybeToExceptT "No module info for current file! Try loading it?" $
+             MaybeT $ pure $ M.lookup name infos
+
+    name' <- findName infos span0 info string
+
+    case getSrcSpan name' of
+        UnhelpfulSpan{} -> do
+            throwE ("Found a name, but no location information." <+>
+                    "The module is:" <+>
+                    maybe "<unknown>" (ppr . moduleName)
+                          (nameModule_maybe name'))
+
+        span' -> return (info,name',span')
+
+-- | Find any uses of the given identifier in the codebase.
+findNameUses :: (GhcMonad m)
+             => Map ModuleName ModInfo
+             -> RealSrcSpan
+             -> String
+             -> ExceptT SDoc m [SrcSpan]
+findNameUses infos span0 string =
+    locToSpans <$> findLoc infos span0 string
+  where
+    locToSpans (modinfo,name',span') =
+        stripSurrounding (span' : map toSrcSpan spans)
+      where
+        toSrcSpan s = RealSrcSpan (spaninfoSrcSpan s) Strict.Nothing
+        spans = filter ((== Just name') . fmap getName . spaninfoVar)
+                       (modinfoSpans modinfo)
+
+-- | Filter out redundant spans which surround/contain other spans.
+stripSurrounding :: [SrcSpan] -> [SrcSpan]
+stripSurrounding xs = filter (not . isRedundant) xs
+  where
+    isRedundant x = any (x `strictlyContains`) xs
+
+    (RealSrcSpan s1 _) `strictlyContains` (RealSrcSpan s2 _)
+         = s1 /= s2 && s1 `containsSpan` s2
+    _                `strictlyContains` _ = False
+
+-- | Try to resolve the name located at the given position, or
+-- otherwise resolve based on the current module's scope.
+findName :: GhcMonad m
+         => Map ModuleName ModInfo
+         -> RealSrcSpan
+         -> ModInfo
+         -> String
+         -> ExceptT SDoc m Name
+findName infos span0 mi string =
+    case resolveName (modinfoSpans mi) (spanInfoFromRealSrcSpan' span0) of
+      Nothing -> tryExternalModuleResolution
+      Just name ->
+        case getSrcSpan name of
+          UnhelpfulSpan {} -> tryExternalModuleResolution
+          RealSrcSpan   {} -> return (getName name)
+  where
+    rdrs = modInfo_rdrs mi
+    tryExternalModuleResolution =
+      case find (matchName $ mkFastString string) rdrs of
+        Nothing -> throwE "Couldn't resolve to any modules."
+        Just imported -> resolveNameFromModule infos imported
+
+    matchName :: FastString -> Name -> Bool
+    matchName str name =
+      str ==
+      occNameFS (getOccName name)
+
+-- | Try to resolve the name from another (loaded) module's exports.
+resolveNameFromModule :: GhcMonad m
+                      => Map ModuleName ModInfo
+                      -> Name
+                      -> ExceptT SDoc m Name
+resolveNameFromModule infos name = do
+     modL <- maybe (throwE $ "No module for" <+> ppr name) return $
+             nameModule_maybe name
+
+     info <- maybe (throwE (ppr (moduleUnit modL) <> ":" <>
+                            ppr modL)) return $
+             M.lookup (moduleName modL) infos
+
+     let all_names = modInfo_rdrs info
+
+     maybe (throwE "No matching export in any local modules.") return $
+         find (matchName name) all_names
+  where
+    matchName :: Name -> Name -> Bool
+    matchName x y = occNameFS (getOccName x) ==
+                    occNameFS (getOccName y)
+
+-- | Try to resolve the type display from the given span.
+resolveName :: [SpanInfo] -> SpanInfo -> Maybe Var
+resolveName spans' si = listToMaybe $ mapMaybe spaninfoVar $
+                        reverse spans' `spaninfosWithin` si
+
+-- | Try to find the type of the given span.
+findType :: GhcMonad m
+         => Map ModuleName ModInfo
+         -> RealSrcSpan
+         -> String
+         -> ExceptT SDoc m (ModInfo, Type)
+findType infos span0 string = do
+    name  <- maybeToExceptT "Couldn't guess that module name. Does it exist?" $
+             guessModule infos (srcSpanFilePath span0)
+
+    info  <- maybeToExceptT "No module info for current file! Try loading it?" $
+             MaybeT $ pure $ M.lookup name infos
+
+    case resolveType (modinfoSpans info) (spanInfoFromRealSrcSpan' span0) of
+        Nothing -> (,) info <$> lift (exprType TM_Inst string)
+        Just ty -> return (info, ty)
+  where
+    -- | Try to resolve the type display from the given span.
+    resolveType :: [SpanInfo] -> SpanInfo -> Maybe Type
+    resolveType spans' si = listToMaybe $ mapMaybe spaninfoType $
+                            reverse spans' `spaninfosWithin` si
+
+-- | Guess a module name from a file path.
+guessModule :: GhcMonad m
+            => Map ModuleName ModInfo -> FilePath -> MaybeT m ModuleName
+guessModule infos fp = do
+    target <- lift $ guessTarget fp Nothing Nothing
+    case targetId target of
+        TargetModule mn  -> return mn
+        TargetFile fp' _ -> guessModule' fp'
+  where
+    guessModule' :: GhcMonad m => FilePath -> MaybeT m ModuleName
+    guessModule' fp' = case findModByFp fp' of
+        Just mn -> return mn
+        Nothing -> do
+            fp'' <- liftIO (makeRelativeToCurrentDirectory fp')
+
+            target' <- lift $ guessTarget fp'' Nothing Nothing
+            case targetId target' of
+                TargetModule mn -> return mn
+                _               -> MaybeT . pure $ findModByFp fp''
+
+    findModByFp :: FilePath -> Maybe ModuleName
+    findModByFp fp' = fst <$> find ((Just fp' ==) . mifp) (M.toList infos)
+      where
+        mifp :: (ModuleName, ModInfo) -> Maybe FilePath
+        mifp = ml_hs_file . ms_location . modinfoSummary . snd
+
+
+-- | Collect type info data for the loaded modules.
+collectInfo :: (GhcMonad m) => Map ModuleName ModInfo -> [ModuleName]
+               -> m (Map ModuleName ModInfo)
+collectInfo ms loaded = do
+    df <- getDynFlags
+    unit_state <- hsc_units <$> getSession
+    liftIO (filterM cacheInvalid loaded) >>= \case
+        [] -> return ms
+        invalidated -> do
+            liftIO (putStrLn ("Collecting type info for " ++
+                              show (length invalidated) ++
+                              " module(s) ... "))
+
+            foldM (go df unit_state) ms invalidated
+  where
+    go df unit_state m name = do { info <- getModInfo name; return (M.insert name info m) }
+                   `MC.catch`
+                   (\(e :: SomeException) -> do
+                         liftIO $ putStrLn
+                                $ showSDocForUser df unit_state alwaysQualify
+                                $ "Error while getting type info from" <+>
+                                  ppr name <> ":" <+> text (show e)
+                         return m)
+
+    cacheInvalid name = case M.lookup name ms of
+        Nothing -> return True
+        Just mi -> do
+            let fp = srcFilePath (modinfoSummary mi)
+                last' = modinfoLastUpdate mi
+            current <- getModificationTime fp
+            exists <- doesFileExist fp
+            if exists
+                then return $ current /= last'
+                else return True
+
+-- | Get the source file path from a ModSummary.
+-- If the .hs file is missing, and the .o file exists,
+-- we return the .o file path.
+srcFilePath :: ModSummary -> FilePath
+srcFilePath modSum = fromMaybe obj_fp src_fp
+    where
+        src_fp = ml_hs_file ms_loc
+        obj_fp = ml_obj_file ms_loc
+        ms_loc = ms_location modSum
+
+-- | Get info about the module: summary, types, etc.
+getModInfo :: (GhcMonad m) => ModuleName -> m ModInfo
+getModInfo name = do
+    m <- getModSummary name
+    p <- parseModule m
+    typechecked <- typecheckModule p
+    let allTypes = processAllTypeCheckedModule typechecked
+        module_info = tm_checked_module_info typechecked
+        !rdr_env = case modInfoRdrEnv module_info of
+          Just rdrs -> Strict.Just rdrs
+            -- NB: this has already been deeply forced; no need to do that again.
+            -- See test case T15369 and Note [Forcing GREInfo] in GHC.Types.GREInfo.
+          Nothing   -> Strict.Nothing
+    ts <- liftIO $ getModificationTime $ srcFilePath m
+    return $
+      ModInfo
+        { modinfoSummary    = m
+        , modinfoSpans      = allTypes
+        , modinfoRdrEnv     = rdr_env
+        , modinfoLastUpdate = ts
+        }
+
+-- | Get the 'Name's from the 'GlobalRdrEnv' of the 'ModInfo', if any.
+modInfo_rdrs :: ModInfo -> [Name]
+modInfo_rdrs mi =
+  case modinfoRdrEnv mi of
+    Strict.Nothing  -> []
+    Strict.Just env -> map greName $ globalRdrEnvElts env
+
+-- | Get ALL source spans in the module.
+processAllTypeCheckedModule :: TypecheckedModule -> [SpanInfo]
+processAllTypeCheckedModule tcm
+  = mapMaybe toSpanInfo
+  $ sortBy cmpSpan
+  $ catMaybes (bts ++ ets ++ pts)
+  where
+    bts = map getTypeLHsBind $ listifyAllSpans tcs
+    ets = map getTypeLHsExpr $ listifyAllSpans tcs
+    pts = map getTypeLPat    $ listifyAllSpans tcs
+
+    tcs = tm_typechecked_source tcm
+
+    -- | Extract 'Id', 'SrcSpan', and 'Type' for 'LHsBind's
+    getTypeLHsBind :: LHsBind GhcTc -> Maybe (Maybe Id,SrcSpan,Type)
+    getTypeLHsBind (L _spn FunBind{fun_id = pid,fun_matches = MG _ _})
+        = Just (Just (unLoc pid), getLocA pid,varType (unLoc pid))
+    getTypeLHsBind _ = Nothing
+
+    -- | Extract 'Id', 'SrcSpan', and 'Type' for 'LHsExpr's
+    getTypeLHsExpr :: LHsExpr GhcTc -> Maybe (Maybe Id,SrcSpan,Type)
+    getTypeLHsExpr e = Just (mid, getLocA e, lhsExprType e)
+      where
+        mid :: Maybe Id
+        mid | HsVar _ (L _ i) <- unwrapVar (unLoc e) = Just i
+            | otherwise                              = Nothing
+
+        unwrapVar (XExpr (WrapExpr (HsWrap _ var))) = var
+        unwrapVar e'                                = e'
+
+    -- | Extract 'Id', 'SrcSpan', and 'Type' for 'LPats's
+    getTypeLPat :: LPat GhcTc -> Maybe (Maybe Id,SrcSpan,Type)
+    getTypeLPat (L spn pat) = Just (getMaybeId pat,locA spn,hsPatType pat)
+      where
+        getMaybeId :: Pat GhcTc -> Maybe Id
+        getMaybeId (VarPat _ (L _ vid)) = Just vid
+        getMaybeId _                        = Nothing
+
+    -- | Get ALL source spans in the source.
+    listifyAllSpans :: Typeable a => TypecheckedSource -> [LocatedA a]
+    listifyAllSpans = everythingAllSpans (++) [] ([] `mkQ` (\x -> [x | p x]))
+      where
+        p (L spn _) = isGoodSrcSpan (locA spn)
+
+    -- | Variant of @syb@'s @everything@ (which summarises all nodes
+    -- in top-down, left-to-right order) with a stop-condition on 'NameSet's
+    -- and 'OverLitTc'
+    everythingAllSpans :: (r -> r -> r) -> r -> GenericQ r -> GenericQ r
+    everythingAllSpans k z f x
+      | (False `mkQ` (const True :: NameSet -> Bool)) x = z
+      -- Exception for OverLitTc: we have SrcSpans in the ol_witness field,
+      -- but it's there only for HIE file info (see Note [Source locations for implicit function calls]).
+      -- T16804 fails without this.
+      | (False `mkQ` (const True :: OverLitTc -> Bool)) x = z
+      | otherwise = foldl k (f x) (gmapQ (everythingAllSpans k z f) x)
+
+    cmpSpan (_,a,_) (_,b,_)
+      | a `isSubspanOf` b = LT
+      | b `isSubspanOf` a = GT
+      | otherwise         = EQ
+
+    -- | Pretty print the types into a 'SpanInfo'.
+    toSpanInfo :: (Maybe Id,SrcSpan,Type) -> Maybe SpanInfo
+    toSpanInfo (n,RealSrcSpan spn _,typ)
+        = Just $ spanInfoFromRealSrcSpan spn (Just typ) n
+    toSpanInfo _ = Nothing
+
+-- helper stolen from @syb@ package
+type GenericQ r = forall a. Data a => a -> r
+
+mkQ :: (Typeable a, Typeable b) => r -> (b -> r) -> a -> r
+(r `mkQ` br) a = maybe r br (cast a)
diff --git a/src-bin-9.10/Clash/GHCi/UI/Monad.hs b/src-bin-9.10/Clash/GHCi/UI/Monad.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/GHCi/UI/Monad.hs
@@ -0,0 +1,575 @@
+{-# LANGUAGE FlexibleInstances, DeriveFunctor, DerivingVia #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+
+-----------------------------------------------------------------------------
+--
+-- Monadery code used in InteractiveUI
+--
+-- (c) The GHC Team 2005-2006
+--
+-----------------------------------------------------------------------------
+
+module Clash.GHCi.UI.Monad (
+        GHCi(..), startGHCi,
+        GHCiState(..), GhciMonad(..),
+        GHCiOption(..), isOptionSet, setOption, unsetOption,
+        Command(..), CommandResult(..), cmdSuccess,
+        CmdExecOutcome(..),
+        LocalConfigBehaviour(..),
+        PromptFunction,
+        BreakLocation(..),
+        TickArray,
+        extractDynFlags, getDynFlags,
+
+        runStmt, runDecls, runDecls', resume, recordBreak, revertCAFs,
+        ActionStats(..), runAndPrintStats, runWithStats, printStats,
+
+        printForUserNeverQualify,
+        printForUserModInfo, printForUserGlobalRdrEnv,
+        printForUser, printForUserPartWay, prettyLocations,
+
+        compileGHCiExpr,
+        initInterpBuffering,
+        turnOffBuffering, turnOffBuffering_,
+        flushInterpBuffers,
+        runInternal,
+        mkEvalWrapper
+    ) where
+
+import Clash.GHCi.UI.Info (ModInfo)
+import qualified GHC
+import GHC.Driver.Monad hiding (liftIO)
+import GHC.Utils.Outputable
+import qualified GHC.Driver.Ppr as Ppr
+import GHC.Types.Name.Occurrence
+import GHC.Types.Name.Reader
+import GHC.Driver.Session
+import GHC.Data.FastString
+import GHC.Driver.Env
+import GHC.Types.SrcLoc
+import GHC.Types.SafeHaskell
+import GHC.Driver.Make (ModIfaceCache(..))
+import GHC.Unit
+import GHC.Types.Name.Reader as RdrName (mkOrig)
+import qualified GHC.Types.Name.Ppr as Ppr (mkNamePprCtx)
+import GHC.Builtin.Names (gHC_INTERNAL_GHCI_HELPERS)
+import GHC.Runtime.Interpreter
+import GHC.Runtime.Context
+import GHCi.RemoteTypes
+import Clash.GHCi.UI.Exception (printGhciException)
+import GHC.Hs (ImportDecl, GhcPs, GhciLStmt, LHsDecl)
+import GHC.Hs.Utils
+import GHC.Utils.Misc
+import GHC.Utils.Logger
+
+import GHC.Utils.Exception hiding (uninterruptibleMask, mask, catch)
+import Numeric
+import Data.Array
+import Data.IORef
+import Data.Time
+import System.Environment
+import System.IO
+import Control.Monad
+import Prelude hiding ((<>))
+
+import System.Console.Haskeline (CompletionFunc, InputT)
+import Control.Monad.Catch as MC
+import Control.Monad.Trans.Class
+import Control.Monad.Trans.Reader
+import Control.Monad.IO.Class
+import Data.Map.Strict (Map)
+import qualified Data.IntMap.Strict as IntMap
+import qualified GHC.Data.EnumSet as EnumSet
+import qualified GHC.LanguageExtensions as LangExt
+
+-----------------------------------------------------------------------------
+-- GHCi monad
+
+data GHCiState = GHCiState
+     {
+        progname       :: String,
+        args           :: [String],
+        evalWrapper    :: ForeignHValue, -- ^ of type @IO a -> IO a@
+        prompt         :: PromptFunction,
+        prompt_cont    :: PromptFunction,
+        editor         :: String,
+        stop           :: String,
+        multiMode      :: Bool,
+        localConfig    :: LocalConfigBehaviour,
+        options        :: [GHCiOption],
+        line_number    :: !Int,         -- ^ input line
+        break_ctr      :: !Int,
+        breaks         :: !(IntMap.IntMap BreakLocation),
+        tickarrays     :: ModuleEnv TickArray,
+            -- ^ 'tickarrays' caches the 'TickArray' for loaded modules,
+            -- so that we don't rebuild it each time the user sets
+            -- a breakpoint.
+        ghci_commands  :: [Command],
+            -- ^ available ghci commands
+        ghci_macros    :: [Command],
+            -- ^ user-defined macros
+        last_command   :: Maybe Command,
+            -- ^ @:@ at the GHCi prompt repeats the last command, so we
+            -- remember it here
+        cmd_wrapper    :: InputT GHCi CommandResult -> InputT GHCi (Maybe Bool),
+            -- ^ The command wrapper is run for each command or statement.
+            -- The 'Bool' value denotes whether the command is successful and
+            -- 'Nothing' means to exit GHCi.
+        cmdqueue       :: [String],
+
+        remembered_ctx :: [InteractiveImport],
+            -- ^ The imports that the user has asked for, via import
+            -- declarations and :module commands.  This list is
+            -- persistent over :reloads (but any imports for modules
+            -- that are not loaded are temporarily ignored).  After a
+            -- :load, all the home-package imports are stripped from
+            -- this list.
+            --
+            -- See bugs #2049, #1873, #1360
+
+        transient_ctx  :: [InteractiveImport],
+            -- ^ An import added automatically after a :load, usually of
+            -- the most recently compiled module.  May be empty if
+            -- there are no modules loaded.  This list is replaced by
+            -- :load, :reload, and :add.  In between it may be modified
+            -- by :module.
+
+        extra_imports  :: [ImportDecl GhcPs],
+            -- ^ These are "always-on" imports, added to the
+            -- context regardless of what other imports we have.
+            -- This is useful for adding imports that are required
+            -- by setGHCiMonad.  Be careful adding things here:
+            -- you can create ambiguities if these imports overlap
+            -- with other things in scope.
+            --
+            -- NB. although this is not currently used by GHCi itself,
+            -- it was added to support other front-ends that are based
+            -- on the GHCi code.  Potentially we could also expose
+            -- this functionality via GHCi commands.
+
+        prelude_imports :: [ImportDecl GhcPs],
+            -- ^ These imports are added to the context when
+            -- -XImplicitPrelude is on and we don't have a *-module
+            -- in the context.  They can also be overridden by another
+            -- import for the same module, e.g.
+            -- "import Prelude hiding (map)"
+
+        ghc_e :: Bool, -- ^ True if this is 'ghc -e' (or runghc)
+
+        short_help :: String,
+            -- ^ help text to display to a user
+        long_help  :: String,
+        lastErrorLocations :: IORef [(FastString, Int)],
+
+        mod_infos  :: !(Map ModuleName ModInfo),
+
+        flushStdHandles :: ForeignHValue,
+            -- ^ @hFlush stdout; hFlush stderr@ in the interpreter
+        noBuffering :: ForeignHValue,
+            -- ^ @hSetBuffering NoBuffering@ for stdin/stdout/stderr
+        ifaceCache :: ModIfaceCache
+     }
+
+type TickArray = Array Int [(GHC.BreakIndex,RealSrcSpan)]
+
+-- | A GHCi command
+data Command
+   = Command
+   { cmdName           :: String
+     -- ^ Name of GHCi command (e.g. "exit")
+   , cmdAction         :: String -> InputT GHCi CmdExecOutcome
+     -- ^ The 'CmdExecOutcome' value denotes whether to exit GHCi cleanly or error out
+   , cmdHidden         :: Bool
+     -- ^ Commands which are excluded from default completion
+     -- and @:help@ summary. This is usually set for commands not
+     -- useful for interactive use but rather for IDEs.
+   , cmdCompletionFunc :: CompletionFunc GHCi
+     -- ^ 'CompletionFunc' for arguments
+   }
+
+-- | Used to denote GHCi command execution result. Specifically, used to
+-- distinguish between two ghci execution modes - "REPL" and "Expression
+-- evaluation mode (ghc -e)". When in "REPL" mode, we don't want to exit
+-- GHCi session when error occurs, (which is when we use "CmdSuccess").
+-- Otherwise, when in expression evaluation mode, all command failures
+-- should lead to GHCi session termination (with ExitFailure 1) which is
+-- when "CmdFailure" is used(this is useful when executing scripts).
+-- "CleanExit" is used to signal end of GHCi session (for example, when
+-- ":quit" command is called).
+data CmdExecOutcome
+  = CleanExit
+  | CmdSuccess
+  | CmdFailure
+
+data CommandResult
+   = CommandComplete
+   { cmdInput :: String
+   , cmdResult :: Either SomeException (Maybe Bool)
+   , cmdStats :: ActionStats
+   }
+   | CommandIncomplete
+     -- ^ Unterminated multiline command
+   deriving Show
+
+cmdSuccess :: MonadThrow m => CommandResult -> m (Maybe Bool)
+cmdSuccess CommandComplete{ cmdResult = Left e } = throwM e
+cmdSuccess CommandComplete{ cmdResult = Right r } = return r
+cmdSuccess CommandIncomplete = return $ Just True
+
+type PromptFunction = [String]
+                   -> Int
+                   -> GHCi SDoc
+
+data GHCiOption
+        = ShowTiming            -- show time/allocs after evaluation
+        | ShowType              -- show the type of expressions
+        | RevertCAFs            -- revert CAFs after every evaluation
+        | Multiline             -- use multiline commands
+        | CollectInfo           -- collect and cache information about
+                                -- modules after load
+        deriving Eq
+
+-- | Treatment of ./.ghci files.  For now we either load or
+-- ignore.  But later we could implement a "safe mode" where
+-- only safe operations are performed.
+--
+data LocalConfigBehaviour
+  = SourceLocalConfig
+  | IgnoreLocalConfig
+  deriving (Eq)
+
+data BreakLocation
+   = BreakLocation
+   { breakModule :: !GHC.Module
+   , breakLoc    :: !SrcSpan
+   , breakTick   :: {-# UNPACK #-} !Int
+   , breakEnabled:: !Bool
+   , onBreakCmd  :: String
+   }
+
+instance Eq BreakLocation where
+  loc1 == loc2 = breakModule loc1 == breakModule loc2 &&
+                 breakTick loc1   == breakTick loc2
+
+prettyLocations :: IntMap.IntMap BreakLocation -> SDoc
+prettyLocations  locs =
+    case  IntMap.null locs of
+      True  -> text "No active breakpoints."
+      False -> vcat $ map (\(i, loc) -> brackets (int i) <+> ppr loc) $ IntMap.toAscList locs
+
+instance Outputable BreakLocation where
+   ppr loc = (ppr $ breakModule loc) <+> ppr (breakLoc loc) <+> pprEnaDisa <+>
+                if null (onBreakCmd loc)
+                   then empty
+                   else doubleQuotes (text (onBreakCmd loc))
+      where pprEnaDisa = case breakEnabled loc of
+                True  -> text "enabled"
+                False -> text "disabled"
+
+recordBreak
+  :: GhciMonad m => BreakLocation -> m (Bool{- was already present -}, Int)
+recordBreak brkLoc = do
+   st <- getGHCiState
+   let oldmap = breaks st
+       oldActiveBreaks = IntMap.assocs oldmap
+   -- don't store the same break point twice
+   case [ nm | (nm, loc) <- oldActiveBreaks, loc == brkLoc ] of
+     (nm:_) -> return (True, nm)
+     [] -> do
+      let oldCounter = break_ctr st
+          newCounter = oldCounter + 1
+      setGHCiState $ st { break_ctr = newCounter,
+                          breaks = IntMap.insert oldCounter brkLoc oldmap
+                        }
+      return (False, oldCounter)
+
+newtype GHCi a = GHCi { unGHCi :: IORef GHCiState -> Ghc a }
+    deriving (Functor)
+    deriving (MonadThrow, MonadCatch, MonadMask) via (ReaderT (IORef GHCiState) Ghc)
+
+reflectGHCi :: (Session, IORef GHCiState) -> GHCi a -> IO a
+reflectGHCi (s, gs) m = unGhc (unGHCi m gs) s
+
+startGHCi :: GHCi a -> GHCiState -> Ghc a
+startGHCi g state = do ref <- liftIO $ newIORef state; unGHCi g ref
+
+instance Applicative GHCi where
+    pure a = GHCi $ \_ -> pure a
+    (<*>) = ap
+
+instance Monad GHCi where
+  (GHCi m) >>= k  =  GHCi $ \s -> m s >>= \a -> unGHCi (k a) s
+
+class GhcMonad m => GhciMonad m where
+  getGHCiState    :: m GHCiState
+  setGHCiState    :: GHCiState -> m ()
+  modifyGHCiState :: (GHCiState -> GHCiState) -> m ()
+  reifyGHCi       :: ((Session, IORef GHCiState) -> IO a) -> m a
+
+instance GhciMonad GHCi where
+  getGHCiState      = GHCi $ \r -> liftIO $ readIORef r
+  setGHCiState s    = GHCi $ \r -> liftIO $ writeIORef r s
+  modifyGHCiState f = GHCi $ \r -> liftIO $ modifyIORef' r f
+  reifyGHCi f       = GHCi $ \r -> reifyGhc $ \s -> f (s, r)
+
+instance GhciMonad (InputT GHCi) where
+  getGHCiState    = lift getGHCiState
+  setGHCiState    = lift . setGHCiState
+  modifyGHCiState = lift . modifyGHCiState
+  reifyGHCi       = lift . reifyGHCi
+
+liftGhc :: Ghc a -> GHCi a
+liftGhc m = GHCi $ \_ -> m
+
+instance MonadIO GHCi where
+  liftIO = liftGhc . liftIO
+
+instance HasDynFlags GHCi where
+  getDynFlags = getSessionDynFlags
+
+instance HasLogger GHCi where
+  getLogger = hsc_logger <$> getSession
+
+instance GhcMonad GHCi where
+  setSession s' = liftGhc $ setSession s'
+  getSession    = liftGhc $ getSession
+
+
+instance HasDynFlags (InputT GHCi) where
+  getDynFlags = lift getDynFlags
+
+instance HasLogger (InputT GHCi) where
+  getLogger = lift getLogger
+
+instance GhcMonad (InputT GHCi) where
+  setSession = lift . setSession
+  getSession = lift getSession
+
+isOptionSet :: GhciMonad m => GHCiOption -> m Bool
+isOptionSet opt
+ = do st <- getGHCiState
+      return $! (opt `elem` options st)
+
+setOption :: GhciMonad m => GHCiOption -> m ()
+setOption opt
+ = do st <- getGHCiState
+      setGHCiState (st{ options = opt : filter (/= opt) (options st) })
+
+unsetOption :: GhciMonad m => GHCiOption -> m ()
+unsetOption opt
+ = do st <- getGHCiState
+      setGHCiState (st{ options = filter (/= opt) (options st) })
+
+printForUserNeverQualify :: GhcMonad m => SDoc -> m ()
+printForUserNeverQualify doc = do
+  dflags <- GHC.getInteractiveDynFlags
+  liftIO $ Ppr.printForUser dflags stdout neverQualify AllTheWay doc
+
+printForUserModInfo :: GhcMonad m => GHC.ModuleInfo -> SDoc -> m ()
+printForUserModInfo info = printForUserGlobalRdrEnv (GHC.modInfoRdrEnv info)
+
+printForUserGlobalRdrEnv :: (GhcMonad m, Outputable info)
+                         => Maybe (GlobalRdrEnvX info) -> SDoc -> m ()
+printForUserGlobalRdrEnv mb_rdr_env doc = do
+  dflags <- GHC.getInteractiveDynFlags
+  name_ppr_ctx <- mkNamePprCtxFromGlobalRdrEnv dflags mb_rdr_env
+  liftIO $ Ppr.printForUser dflags stdout name_ppr_ctx AllTheWay doc
+    where
+      mkNamePprCtxFromGlobalRdrEnv _ Nothing = GHC.getNamePprCtx
+      mkNamePprCtxFromGlobalRdrEnv dflags (Just rdr_env) =
+        withSession $ \ hsc_env ->
+        let unit_env = hsc_unit_env hsc_env
+            ptc = initPromotionTickContext dflags
+        in  return $ Ppr.mkNamePprCtx ptc unit_env rdr_env
+
+printForUser :: GhcMonad m => SDoc -> m ()
+printForUser doc = do
+  name_ppr_ctx <- GHC.getNamePprCtx
+  dflags <- GHC.getInteractiveDynFlags
+  liftIO $ Ppr.printForUser dflags stdout name_ppr_ctx AllTheWay doc
+
+printForUserPartWay :: GhcMonad m => SDoc -> m ()
+printForUserPartWay doc = do
+  name_ppr_ctx <- GHC.getNamePprCtx
+  dflags <- GHC.getInteractiveDynFlags
+  liftIO $ Ppr.printForUser dflags stdout name_ppr_ctx DefaultDepth doc
+
+-- | Run a single Haskell expression
+runStmt
+  :: GhciMonad m
+  => GhciLStmt GhcPs -> String -> GHC.SingleStep -> m (Maybe GHC.ExecResult)
+runStmt stmt stmt_text step = do
+  st <- getGHCiState
+  GHC.handleSourceError (\e -> do printGhciException e; return Nothing) $ do
+    let opts = GHC.execOptions
+                  { GHC.execSourceFile = progname st
+                  , GHC.execLineNumber = line_number st
+                  , GHC.execSingleStep = step
+                  , GHC.execWrap = \fhv -> EvalApp (EvalThis (evalWrapper st))
+                                                   (EvalThis fhv) }
+    Just <$> GHC.execStmt' stmt stmt_text opts
+
+runDecls :: GhciMonad m => String -> m (Maybe [GHC.Name])
+runDecls decls = do
+  st <- getGHCiState
+  reifyGHCi $ \x ->
+    withProgName (progname st) $
+    withArgs (args st) $
+      reflectGHCi x $ do
+        GHC.handleSourceError (\e -> do printGhciException e
+                                        return Nothing) $ do
+          r <- GHC.runDeclsWithLocation (progname st) (line_number st) decls
+          return (Just r)
+
+runDecls' :: GhciMonad m => [LHsDecl GhcPs] -> m (Maybe [GHC.Name])
+runDecls' decls = do
+  st <- getGHCiState
+  reifyGHCi $ \x ->
+    withProgName (progname st) $
+    withArgs (args st) $
+    reflectGHCi x $
+      GHC.handleSourceError
+        (\e -> do printGhciException e
+                  return Nothing)
+        (Just <$> GHC.runParsedDecls decls)
+
+resume :: GhciMonad m => (SrcSpan -> Bool) -> GHC.SingleStep -> Maybe Int -> m GHC.ExecResult
+resume canLogSpan step mbIgnoreCnt = do
+  st <- getGHCiState
+  reifyGHCi $ \x ->
+    withProgName (progname st) $
+    withArgs (args st) $
+      reflectGHCi x $ do
+        GHC.resumeExec canLogSpan step mbIgnoreCnt
+
+-- --------------------------------------------------------------------------
+-- timing & statistics
+
+data ActionStats = ActionStats
+  { actionAllocs :: Maybe Integer
+  , actionElapsedTime :: Double
+  } deriving Show
+
+runAndPrintStats
+  :: GhciMonad m
+  => (a -> Maybe Integer)
+  -> m a
+  -> m (ActionStats, Either SomeException a)
+runAndPrintStats getAllocs action = do
+  result <- runWithStats getAllocs action
+  case result of
+    (stats, Right{}) -> do
+      showTiming <- isOptionSet ShowTiming
+      when showTiming $ do
+        dflags  <- getDynFlags
+        liftIO $ printStats dflags stats
+    _ -> return ()
+  return result
+
+runWithStats
+  :: ExceptionMonad m
+  => (a -> Maybe Integer) -> m a -> m (ActionStats, Either SomeException a)
+runWithStats getAllocs action = do
+  t0 <- liftIO getCurrentTime
+  result <- MC.try action
+  let allocs = either (const Nothing) getAllocs result
+  t1 <- liftIO getCurrentTime
+  let elapsedTime = realToFrac $ t1 `diffUTCTime` t0
+  return (ActionStats allocs elapsedTime, result)
+
+printStats :: DynFlags -> ActionStats -> IO ()
+printStats dflags ActionStats{actionAllocs = mallocs, actionElapsedTime = secs}
+   = do let secs_str = showFFloat (Just 2) secs
+        putStrLn (Ppr.showSDoc dflags (
+                 parens (text (secs_str "") <+> text "secs" <> comma <+>
+                         case mallocs of
+                           Nothing -> empty
+                           Just allocs ->
+                             text (separateThousands allocs) <+> text "bytes")))
+  where
+    separateThousands n = reverse . separate . reverse . show $ n
+      where separate n'
+              | n' `lengthAtMost` 3 = n'
+              | otherwise           = take 3 n' ++ "," ++ separate (drop 3 n')
+
+-----------------------------------------------------------------------------
+-- reverting CAFs
+
+revertCAFs :: GhciMonad m => m ()
+revertCAFs = do
+  interp <- hscInterp <$> GHC.getSession
+  liftIO $ interpCmd interp RtsRevertCAFs
+  s <- getGHCiState
+  when (not (ghc_e s)) turnOffBuffering
+     -- Have to turn off buffering again, because we just
+     -- reverted stdout, stderr & stdin to their defaults.
+
+
+-----------------------------------------------------------------------------
+-- To flush buffers for the *interpreted* computation we need
+-- to refer to *its* stdout/stderr handles
+
+-- | Compile "hFlush stdout; hFlush stderr" once, so we can use it repeatedly
+initInterpBuffering :: Ghc (ForeignHValue, ForeignHValue)
+initInterpBuffering = do
+  let mkHelperExpr :: OccName -> Ghc ForeignHValue
+      mkHelperExpr occ =
+        GHC.compileParsedExprRemote
+        $ GHC.nlHsVar $ RdrName.mkOrig gHC_INTERNAL_GHCI_HELPERS occ
+  nobuf <- mkHelperExpr $ mkVarOccFS (fsLit "disableBuffering")
+  flush <- mkHelperExpr $ mkVarOccFS (fsLit "flushAll")
+  return (nobuf, flush)
+
+-- | Invoke "hFlush stdout; hFlush stderr" in the interpreter
+flushInterpBuffers :: GhciMonad m => m ()
+flushInterpBuffers = do
+  st <- getGHCiState
+  interp <- hscInterp <$> GHC.getSession
+  liftIO $ evalIO interp (flushStdHandles st)
+
+-- | Turn off buffering for stdin, stdout, and stderr in the interpreter
+turnOffBuffering :: GhciMonad m => m ()
+turnOffBuffering = do
+  st <- getGHCiState
+  turnOffBuffering_ (noBuffering st)
+
+turnOffBuffering_ :: GhcMonad m => ForeignHValue -> m ()
+turnOffBuffering_ fhv = do
+  interp <- hscInterp <$> getSession
+  liftIO $ evalIO interp fhv
+
+mkEvalWrapper :: GhcMonad m => String -> [String] ->  m ForeignHValue
+mkEvalWrapper progname' args' =
+  runInternal $ GHC.compileParsedExprRemote
+  $ evalWrapper' `GHC.mkHsApp` nlHsString progname'
+                 `GHC.mkHsApp` nlList (map nlHsString args')
+  where
+    nlHsString = nlHsLit . mkHsString
+    evalWrapper' =
+      GHC.nlHsVar $ RdrName.mkOrig gHC_INTERNAL_GHCI_HELPERS (mkVarOccFS (fsLit "evalWrapper"))
+
+-- | Run a 'GhcMonad' action to compile an expression for internal usage.
+runInternal :: GhcMonad m => m a -> m a
+runInternal =
+    withTempSession mkTempSession
+  where
+    mkTempSession = hscUpdateFlags (\dflags -> dflags
+      { -- Running GHCi's internal expression is incompatible with -XSafe.
+          -- We temporarily disable any Safe Haskell settings while running
+          -- GHCi internal expressions. (see #12509)
+        safeHaskell = Sf_None,
+          -- Disable dumping of any data during evaluation of GHCi's internal
+          -- expressions. (#17500)
+        dumpFlags = EnumSet.empty
+      }
+        -- RebindableSyntax can wreak havoc with GHCi in several ways
+          -- (see #13385 and #14342 for examples), so we temporarily
+          -- disable it too.
+          `xopt_unset` LangExt.RebindableSyntax
+          -- We heavily depend on -fimplicit-import-qualified to compile expr
+          -- with fully qualified names without imports.
+          `gopt_set` Opt_ImplicitImportQualified
+      )
+
+compileGHCiExpr :: GhcMonad m => String -> m ForeignHValue
+compileGHCiExpr expr = runInternal $ GHC.compileExprRemote expr
diff --git a/src-bin-9.10/Clash/GHCi/Util.hs b/src-bin-9.10/Clash/GHCi/Util.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/GHCi/Util.hs
@@ -0,0 +1,16 @@
+{-# LANGUAGE MagicHash, UnboxedTuples #-}
+
+-- | Utilities for GHCi.
+module Clash.GHCi.Util where
+
+-- NOTE: Avoid importing GHC modules here, because the primary purpose
+-- of this module is to not use UnboxedTuples in a module that imports
+-- lots of other modules.  See issue#13101 for more info.
+
+import GHC.Exts
+import GHC.Types
+
+anyToPtr :: a -> IO (Ptr ())
+anyToPtr x =
+  IO (\s -> case anyToAddr# x s of
+              (# s', addr #) -> (# s', Ptr addr #)) :: IO (Ptr ())
diff --git a/src-bin-9.10/Clash/Main.hs b/src-bin-9.10/Clash/Main.hs
new file mode 100644
--- /dev/null
+++ b/src-bin-9.10/Clash/Main.hs
@@ -0,0 +1,1240 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NondecreasingIndentation #-}
+{-# LANGUAGE TupleSections #-}
+{-# OPTIONS -fno-warn-incomplete-patterns -optc-DNON_POSIX_SOURCE #-}
+
+-----------------------------------------------------------------------------
+--
+-- GHC Driver program
+--
+-- (c) The University of Glasgow 2005
+--
+-----------------------------------------------------------------------------
+
+module Clash.Main (defaultMain, defaultMainWithAction) where
+
+-- The official GHC API
+import qualified GHC
+import GHC              (parseTargetFiles,  Ghc, GhcMonad(..),
+                          LoadHowMuch(..) )
+
+import GHC.Driver.Backend
+import GHC.Driver.CmdLine
+import GHC.Driver.Env
+import GHC.Driver.Errors
+import GHC.Driver.Errors.Types
+import GHC.Driver.Phases
+import GHC.Driver.Session
+import GHC.Driver.Ppr
+import GHC.Driver.Pipeline  ( oneShot, compileFile )
+import GHC.Driver.MakeFile  ( doMkDependHS )
+import GHC.Driver.Backpack  ( doBackpack )
+import GHC.Driver.Plugins
+import GHC.Driver.Config.Logger (initLogFlags)
+import GHC.Driver.Config.Diagnostic
+
+import GHC.Platform
+import GHC.Platform.Ways
+import GHC.Platform.Host
+
+#if defined(HAVE_INTERNAL_INTERPRETER)
+import Clash.GHCi.UI        ( interactiveUI, ghciWelcomeMsg, defaultGhciSettings )
+#endif
+
+import GHC.Runtime.Loader   ( loadFrontendPlugin, initializeSessionPlugins )
+
+import GHC.Unit.Env
+import GHC.Unit (UnitId, homeUnitDepends)
+import GHC.Unit.Home.ModInfo (emptyHomePackageTable)
+import GHC.Unit.Module ( ModuleName, mkModuleName )
+import GHC.Unit.Module.ModIface
+import GHC.Unit.State  ( pprUnits, pprUnitsSimple )
+import GHC.Unit.Finder ( findImportedModule, FindResult(..) )
+import qualified GHC.Unit.State as State
+import GHC.Unit.Types  ( IsBootInterface(..) )
+
+import GHC.Types.Basic     ( failed )
+import GHC.Types.SrcLoc
+import GHC.Types.SourceError
+import GHC.Types.Unique.Supply
+import GHC.Types.PkgQual
+
+import GHC.Utils.Error
+import GHC.Utils.Misc
+import GHC.Utils.Panic
+import GHC.Utils.Outputable as Outputable
+import GHC.Utils.Monad       ( liftIO, mapMaybeM )
+import GHC.Utils.Binary        ( openBinMem, put_ )
+import GHC.Utils.Logger
+
+import GHC.Settings.Config
+import GHC.Settings.Constants
+import GHC.Settings.IO
+
+import GHC.HandleEncoding
+import GHC.Data.FastString
+import GHC.SysTools.BaseDir
+
+import GHC.Iface.Load
+import GHC.Iface.Recomp.Binary ( fingerprintBinMem )
+
+import GHC.Tc.Utils.Monad      ( initIfaceCheck )
+import GHC.Iface.Errors.Ppr
+
+-- Standard Haskell libraries
+import System.IO
+import System.Environment
+import System.Exit
+import System.FilePath
+import Control.Monad
+import Control.Monad.Trans.Class
+import Control.Monad.Trans.Except (throwE, runExceptT)
+import Data.Char
+import Data.List ( partition, intercalate, (\\) )
+import qualified Data.Set as Set
+import qualified Data.Map as Map
+import Data.Maybe
+import Prelude
+import GHC.ResponseFile (expandResponse)
+import Data.Bifunctor
+import GHC.Data.Graph.Directed
+import qualified Data.List.NonEmpty as NE
+
+-- clash additions
+import           Paths_clash_ghc
+import           Clash.GHCi.UI (makeHDL)
+import           Control.Monad.Catch (catch)
+import           Data.List (nub)
+import           Data.Proxy
+import           Data.IORef (IORef, newIORef, readIORef, modifyIORef')
+import qualified Data.Version (showVersion)
+import           GHC.Data.EnumSet as EnumSet
+import           GHC.Driver.Session as Session
+
+import           Clash.Backend (Backend)
+import           Clash.Backend.SystemVerilog (SystemVerilogState)
+import           Clash.Backend.VHDL    (VHDLState)
+import           Clash.Backend.Verilog (VerilogState)
+import           Clash.Driver.Types
+  (ClashOpts (..), defClashOpts)
+import           Clash.GHC.ClashFlags
+import           Clash.Util (clashLibVersion)
+import           Clash.GHC.LoadModules (ghcLibDir, setWantedLanguageExtensions)
+import           Clash.GHC.Util (handleClashException)
+
+-----------------------------------------------------------------------------
+-- ToDo:
+
+-- time commands when run with -v
+-- user ways
+-- Win32 support: proper signal handling
+-- reading the package configuration file is too slow
+-- -K<size>
+
+-----------------------------------------------------------------------------
+-- GHC's command-line interface
+
+defaultMain :: [String] -> IO ()
+defaultMain = defaultMainWithAction (return ())
+
+defaultMainWithAction :: Ghc () -> [String] -> IO ()
+defaultMainWithAction startAction = flip withArgs $ do
+   hSetBuffering stdout LineBuffering
+   hSetBuffering stderr LineBuffering
+
+   configureHandleEncoding
+   GHC.defaultErrorHandler defaultFatalMessager defaultFlushOut $ do
+    -- 1. extract the -B flag from the args
+    argv0 <- getArgs
+
+    let argv1 = map (mkGeneralLocated "on the commandline") argv0
+    libDir <- ghcLibDir
+
+    r <- newIORef defClashOpts
+    (argv2, clashFlagWarnings) <- parseClashFlags r argv1
+
+    -- 2. Parse the "mode" flags (--make, --interactive etc.)
+    (mode, units, argv3, modeFlagWarnings) <- parseModeFlags argv2
+    let flagWarnings = modeFlagWarnings ++ clashFlagWarnings
+
+    -- If all we want to do is something like showing the version number
+    -- then do it now, before we start a GHC session etc. This makes
+    -- getting basic information much more resilient.
+
+    -- In particular, if we wait until later before giving the version
+    -- number then bootstrapping gets confused, as it tries to find out
+    -- what version of GHC it's using before package.conf exists, so
+    -- starting the session fails.
+    case mode of
+        Left preStartupMode ->
+            do case preStartupMode of
+                   ShowSupportedExtensions   -> showSupportedExtensions (Just libDir)
+                   ShowVersion               -> showVersion
+                   ShowNumVersion            -> putStrLn cProjectVersion
+                   ShowOptions isInteractive -> showOptions isInteractive r
+        Right postStartupMode ->
+            -- start our GHC session
+            GHC.runGhc (Just libDir) $ do
+
+            dflags <- GHC.getSessionDynFlags
+            let dflagsExtra = setWantedLanguageExtensions dflags
+
+                ghcTyLitNormPlugin = GHC.mkModuleName "GHC.TypeLits.Normalise"
+                ghcTyLitExtrPlugin = GHC.mkModuleName "GHC.TypeLits.Extra.Solver"
+                ghcTyLitKNPlugin   = GHC.mkModuleName "GHC.TypeLits.KnownNat.Solver"
+                dflagsExtra1 = dflagsExtra
+                                  { Session.pluginModNames = nub $
+                                      ghcTyLitNormPlugin : ghcTyLitExtrPlugin :
+                                      ghcTyLitKNPlugin :
+                                      Session.pluginModNames dflagsExtra
+                                  }
+
+            case postStartupMode of
+                Left preLoadMode ->
+                    liftIO $ do
+                        case preLoadMode of
+                            ShowInfo               -> showInfo dflagsExtra1
+                            ShowGhcUsage           -> showGhcUsage  dflagsExtra1
+                            ShowGhciUsage          -> showGhciUsage dflagsExtra1
+                            PrintWithDynFlags f    -> putStrLn (f dflagsExtra1)
+                Right postLoadMode ->
+                    main' postLoadMode units dflagsExtra1 argv3 flagWarnings startAction r
+
+main' :: PostLoadMode -> [String] -> DynFlags -> [Located String] -> [Warn]
+      -> Ghc () -> IORef ClashOpts
+      -> Ghc ()
+main' postLoadMode units dflags0 args flagWarnings startAction clashOpts = do
+  let args' = case postLoadMode of
+                DoRun -> takeWhile (\arg -> unLoc arg /= "--") args
+                _     -> args
+
+  -- set the default GhcMode, backend and GhcLink.  The backend
+  -- can be further adjusted on a module by module basis, using only
+  -- the -fllvm and -fasm flags.  If the default backend is not
+  -- LLVM or NCG, -fllvm and -fasm have no effect.
+  let dflt_backend = backend dflags0
+      (mode, bcknd, link)
+         = case postLoadMode of
+               DoInteractive   -> (CompManager, interpreterBackend,  LinkInMemory)
+               DoEval _        -> (CompManager, interpreterBackend,  LinkInMemory)
+               DoRun           -> (CompManager, interpreterBackend,  LinkInMemory)
+               DoMake          -> (CompManager, dflt_backend, LinkBinary)
+               DoBackpack      -> (CompManager, dflt_backend, LinkBinary)
+               DoMkDependHS    -> (MkDepend,    dflt_backend, LinkBinary)
+               DoAbiHash       -> (OneShot,     dflt_backend, LinkBinary)
+               DoVHDL          -> (CompManager, noBackend,     NoLink)
+               DoVerilog       -> (CompManager, noBackend,     NoLink)
+               DoSystemVerilog -> (CompManager, noBackend,     NoLink)
+               _               -> (OneShot,     dflt_backend, LinkBinary)
+
+  let dflags1 = dflags0{ ghcMode   = mode,
+                         backend   = bcknd,
+                         ghcLink   = link,
+                         verbosity = case postLoadMode of
+                                         DoEval _ -> 0
+                                         DoRun    -> 0
+                                         _other   -> 1
+                        }
+
+      -- turn on -fimplicit-import-qualified for GHCi now, so that it
+      -- can be overridden from the command-line
+      -- XXX: this should really be in the interactive DynFlags, but
+      -- we don't set that until later in interactiveUI
+      -- We also set -fignore-optim-changes and -fignore-hpc-changes,
+      -- which are program-level options. Again, this doesn't really
+      -- feel like the right place to handle this, but we don't have
+      -- a great story for the moment.
+      dflags2  | DoInteractive <- postLoadMode = def_ghci_flags
+               | DoEval _      <- postLoadMode = def_ghci_flags
+               | DoRun         <- postLoadMode = def_ghci_flags
+               | otherwise                     = dflags1
+        where def_ghci_flags = dflags1 `gopt_set` Opt_ImplicitImportQualified
+                                       `gopt_set` Opt_IgnoreOptimChanges
+                                       `gopt_set` Opt_IgnoreHpcChanges
+                                       -- Setting this by default has the nice effect that
+                                       -- -fno-code and --interactive falls back to interpreter rather than
+                                       -- object code but has little other effect unless you are also using
+                                       -- fat interface files.
+                                       `gopt_set` Opt_UseBytecodeRatherThanObjects
+                                       -- By default enable the debugger by inserting breakpoints
+                                       `gopt_set` Opt_InsertBreakpoints
+
+  logger1 <- getLogger
+  let logger2 = setLogFlags logger1 (initLogFlags dflags2)
+
+        -- The rest of the arguments are "dynamic"
+        -- Leftover ones are presumably files
+  (dflags3, fileish_args, dynamicFlagWarnings) <-
+      GHC.parseDynamicFlags logger2 dflags2 args'
+
+-- Propagate -Werror to Clash
+  liftIO . modifyIORef' clashOpts $ \opts ->
+    opts { opt_werror = EnumSet.member Opt_WarnIsError (generalFlags dflags3) }
+
+  let dflags4 = if backendNeedsFullWays bcknd &&
+                   not (gopt Opt_ExternalInterpreter dflags3)
+                then
+                    let platform = targetPlatform dflags3
+                        dflags3a = dflags3 { targetWays_ = hostFullWays }
+                        dflags3b = foldl gopt_set dflags3a
+                                 $ concatMap (wayGeneralFlags platform)
+                                             hostFullWays
+                        dflags3c = foldl gopt_unset dflags3b
+                                 $ concatMap (wayUnsetGeneralFlags platform)
+                                             hostFullWays
+                    in dflags3c
+                else
+                    dflags3
+
+  let logger4 = setLogFlags logger2 (initLogFlags dflags4)
+
+  GHC.prettyPrintGhcErrors logger4 $ do
+
+  let diag_opts = initDiagOpts dflags4
+  let flagWarnings' = GhcDriverMessage <$> mconcat [warnsToMessages diag_opts flagWarnings, dynamicFlagWarnings]
+
+  handleSourceError (\e -> do
+       GHC.printException e
+       liftIO $ exitWith (ExitFailure 1)) $ do
+         liftIO $ printOrThrowDiagnostics logger4 (initPrintConfig dflags4) diag_opts flagWarnings'
+
+  liftIO $ showBanner postLoadMode dflags4
+
+  let (dflags5, srcs, objs) = parseTargetFiles dflags4 (map unLoc fileish_args)
+
+  -- we've finished manipulating the DynFlags, update the session
+  _ <- GHC.setSessionDynFlags dflags5
+  dflags6 <- GHC.getSessionDynFlags
+
+  -- Must do this before loading plugins
+  liftIO $ initUniqSupply (initialUnique dflags6) (uniqueIncrement dflags6)
+
+  -- Initialise plugins here because the plugin author might already expect this
+  -- subsequent call to `getLogger` to be affected by a plugin.
+  initializeSessionPlugins
+  hsc_env <- getSession
+  logger <- getLogger
+
+
+        ---------------- Display configuration -----------
+  case verbosity dflags6 of
+    v | v == 4 -> liftIO $ dumpUnitsSimple hsc_env
+      | v >= 5 -> liftIO $ dumpUnits       hsc_env
+      | otherwise -> return ()
+
+        ---------------- Final sanity checking -----------
+  liftIO $ checkOptions postLoadMode dflags6 srcs objs units
+
+  ---------------- Do the business -----------
+  handleSourceError (\e -> do
+       GHC.printException e
+       liftIO $ exitWith (ExitFailure 1)) $ do
+    clashOpts' <- liftIO (readIORef clashOpts)
+    let clash fun = catch (fun startAction clashOpts srcs) (handleClashException dflags6 clashOpts')
+    case postLoadMode of
+       ShowInterface f        -> liftIO $ showIface logger
+                                                    (hsc_dflags hsc_env)
+                                                    (hsc_units  hsc_env)
+                                                    (hsc_NC     hsc_env)
+                                                    f
+       DoMake                 -> doMake units srcs
+       DoMkDependHS           -> doMkDependHS (map fst srcs)
+       StopBefore p           -> liftIO (oneShot hsc_env p srcs)
+       DoInteractive          -> ghciUI clashOpts units srcs Nothing
+       DoEval exprs           -> ghciUI clashOpts units srcs $ Just $ reverse exprs
+       DoRun                  -> doRun clashOpts units srcs args
+       DoAbiHash              -> abiHash (map fst srcs)
+       ShowPackages           -> liftIO $ showUnits hsc_env
+       DoFrontend f           -> doFrontend f srcs
+       DoBackpack             -> doBackpack (map fst srcs)
+       DoVHDL                 -> clash makeVHDL
+       DoVerilog              -> clash makeVerilog
+       DoSystemVerilog        -> clash makeSystemVerilog
+
+  liftIO $ dumpFinalStats logger
+
+doRun :: IORef ClashOpts -> [String] -> [(FilePath, Maybe Phase)] -> [Located String] -> Ghc ()
+doRun clashOpts units srcs args = do
+    dflags <- getDynFlags
+    let mainFun = fromMaybe "main" (mainFunIs dflags)
+    ghciUI clashOpts units srcs (Just ["System.Environment.withArgs " ++ show args' ++ " (Control.Monad.void " ++ mainFun ++ ")"])
+  where
+    args' = drop 1 $ dropWhile (/= "--") $ map unLoc args
+
+ghciUI :: IORef ClashOpts -> [String] -> [(FilePath, Maybe Phase)] -> Maybe [String] -> Ghc ()
+#if !defined(HAVE_INTERNAL_INTERPRETER)
+ghciUI _ _ _ _ =
+  throwGhcException (CmdLineError "not built for interactive use")
+#else
+ghciUI clashOpts units srcs maybe_expr = do
+  hs_srcs <- case NE.nonEmpty units of
+    Just ne_units -> do
+      initMulti ne_units
+    Nothing -> do
+      case srcs of
+        [] -> return []
+        _  -> do
+          s <- initMake srcs
+          return $ map (uncurry (,Nothing,)) s
+  interactiveUI (defaultGhciSettings clashOpts) hs_srcs maybe_expr
+#endif
+
+
+-- -----------------------------------------------------------------------------
+-- Option sanity checks
+
+-- | Ensure sanity of options.
+--
+-- Throws 'UsageError' or 'CmdLineError' if not.
+checkOptions :: PostLoadMode -> DynFlags -> [(String,Maybe Phase)] -> [String] -> [String] -> IO ()
+     -- Final sanity checking before kicking off a compilation (pipeline).
+checkOptions mode dflags srcs objs units = do
+     -- Complain about any unknown flags
+   let unknown_opts = [ f | (f@('-':_), _) <- srcs ]
+   when (notNull unknown_opts) (unknownFlagsErr unknown_opts)
+
+   when (not (Set.null (rtsWays (ways dflags)))
+         && isInterpretiveMode mode) $
+        hPutStrLn stderr ("Warning: -debug, -threaded and -ticky are ignored by GHCi")
+
+        -- -prof and --interactive are not a good combination
+   when ((fullWays (ways dflags) /= hostFullWays)
+         && isInterpretiveMode mode
+         && not (gopt Opt_ExternalInterpreter dflags)) $
+      do throwGhcException (UsageError
+              "-fexternal-interpreter is required when using --interactive with a non-standard way (-prof, -static, or -dynamic).")
+        -- -ohi sanity check
+   if (isJust (outputHi dflags) &&
+      (isCompManagerMode mode || srcs `lengthExceeds` 1))
+        then throwGhcException (UsageError "-ohi can only be used when compiling a single source file")
+        else do
+
+   if (isJust (dynOutputHi dflags) &&
+      (isCompManagerMode mode || srcs `lengthExceeds` 1))
+     then throwGhcException (UsageError "-dynohi can only be used when compiling a single source file")
+     else do
+
+        -- -o sanity checking
+   if (srcs `lengthExceeds` 1 && isJust (outputFile dflags)
+         && not (isLinkMode mode))
+        then throwGhcException (UsageError "can't apply -o to multiple source files")
+        else do
+
+   let not_linking = not (isLinkMode mode) || isNoLink (ghcLink dflags)
+
+   when (not_linking && not (null objs)) $
+        hPutStrLn stderr ("Warning: the following files would be used as linker inputs, but linking is not being done: " ++ unwords objs)
+
+        -- Check that there are some input files
+        -- (except in the interactive case)
+   if null srcs && (null objs || not_linking) && needsInputsMode mode && null units
+        then throwGhcException (UsageError "no input files" )
+        else do
+
+   case mode of
+      StopBefore StopC | not (backendGeneratesHc (backend dflags))
+        -> throwGhcException $ UsageError $
+           "the option -C is only available with an unregisterised GHC"
+      StopBefore StopAs | ghcLink dflags == NoLink
+        -> throwGhcException $ UsageError $
+           "the options -S and -fno-code are incompatible. Please omit -S"
+
+      _ -> return ()
+
+     -- Verify that output files point somewhere sensible.
+   verifyOutputFiles dflags
+
+-- Compiler output options
+
+-- Called to verify that the output files point somewhere valid.
+--
+-- The assumption is that the directory portion of these output
+-- options will have to exist by the time 'verifyOutputFiles'
+-- is invoked.
+--
+-- We create the directories for -odir, -hidir, -outputdir etc. ourselves if
+-- they don't exist, so don't check for those here (#2278).
+verifyOutputFiles :: DynFlags -> IO ()
+verifyOutputFiles dflags = do
+  let ofile = outputFile dflags
+  when (isJust ofile) $ do
+     let fn = fromJust ofile
+     flg <- doesDirNameExist fn
+     when (not flg) (nonExistentDir "-o" fn)
+  let ohi = outputHi dflags
+  when (isJust ohi) $ do
+     let hi = fromJust ohi
+     flg <- doesDirNameExist hi
+     when (not flg) (nonExistentDir "-ohi" hi)
+ where
+   nonExistentDir flg dir =
+     throwGhcException (CmdLineError ("error: directory portion of " ++
+                             show dir ++ " does not exist (used with " ++
+                             show flg ++ " option.)"))
+
+-----------------------------------------------------------------------------
+-- GHC modes of operation
+
+type Mode = Either PreStartupMode PostStartupMode
+type PostStartupMode = Either PreLoadMode PostLoadMode
+
+data PreStartupMode
+  = ShowVersion                          -- ghc -V/--version
+  | ShowNumVersion                       -- ghc --numeric-version
+  | ShowSupportedExtensions              -- ghc --supported-extensions
+  | ShowOptions Bool {- isInteractive -} -- ghc --show-options
+
+showVersionMode, showNumVersionMode, showSupportedExtensionsMode, showOptionsMode :: Mode
+showVersionMode             = mkPreStartupMode ShowVersion
+showNumVersionMode          = mkPreStartupMode ShowNumVersion
+showSupportedExtensionsMode = mkPreStartupMode ShowSupportedExtensions
+showOptionsMode             = mkPreStartupMode (ShowOptions False)
+
+mkPreStartupMode :: PreStartupMode -> Mode
+mkPreStartupMode = Left
+
+isShowVersionMode :: Mode -> Bool
+isShowVersionMode (Left ShowVersion) = True
+isShowVersionMode _ = False
+
+isShowNumVersionMode :: Mode -> Bool
+isShowNumVersionMode (Left ShowNumVersion) = True
+isShowNumVersionMode _ = False
+
+data PreLoadMode
+  = ShowGhcUsage                           -- ghc -?
+  | ShowGhciUsage                          -- ghci -?
+  | ShowInfo                               -- ghc --info
+  | PrintWithDynFlags (DynFlags -> String) -- ghc --print-foo
+
+showGhcUsageMode, showGhciUsageMode, showInfoMode :: Mode
+showGhcUsageMode = mkPreLoadMode ShowGhcUsage
+showGhciUsageMode = mkPreLoadMode ShowGhciUsage
+showInfoMode = mkPreLoadMode ShowInfo
+
+printSetting :: String -> Mode
+printSetting k = mkPreLoadMode (PrintWithDynFlags f)
+    where f dflags = fromMaybe (panic ("Setting not found: " ++ show k))
+                   $ lookup k (compilerInfo dflags)
+
+mkPreLoadMode :: PreLoadMode -> Mode
+mkPreLoadMode = Right . Left
+
+isShowGhcUsageMode :: Mode -> Bool
+isShowGhcUsageMode (Right (Left ShowGhcUsage)) = True
+isShowGhcUsageMode _ = False
+
+isShowGhciUsageMode :: Mode -> Bool
+isShowGhciUsageMode (Right (Left ShowGhciUsage)) = True
+isShowGhciUsageMode _ = False
+
+data PostLoadMode
+  = ShowInterface FilePath  -- ghc --show-iface
+  | DoMkDependHS            -- ghc -M
+  | StopBefore StopPhase    -- ghc -E | -C | -S
+                            -- StopBefore StopLn is the default
+  | DoMake                  -- ghc --make
+  | DoBackpack              -- ghc --backpack foo.bkp
+  | DoInteractive           -- ghc --interactive
+  | DoEval [String]         -- ghc -e foo -e bar => DoEval ["bar", "foo"]
+  | DoRun                   -- ghc --run
+  | DoAbiHash               -- ghc --abi-hash
+  | ShowPackages            -- ghc --show-packages
+  | DoFrontend ModuleName   -- ghc --frontend Plugin.Module
+  | DoVHDL                  -- ghc --vhdl
+  | DoVerilog               -- ghc --verilog
+  | DoSystemVerilog         -- ghc --systemverilog
+
+doMkDependHSMode, doMakeMode, doInteractiveMode, doRunMode,
+  doAbiHashMode, showUnitsMode, doVHDLMode, doVerilogMode,
+  doSystemVerilogMode :: Mode
+doMkDependHSMode = mkPostLoadMode DoMkDependHS
+doMakeMode = mkPostLoadMode DoMake
+doInteractiveMode = mkPostLoadMode DoInteractive
+doRunMode = mkPostLoadMode DoRun
+doAbiHashMode = mkPostLoadMode DoAbiHash
+showUnitsMode = mkPostLoadMode ShowPackages
+doVHDLMode = mkPostLoadMode DoVHDL
+doVerilogMode = mkPostLoadMode DoVerilog
+doSystemVerilogMode = mkPostLoadMode DoSystemVerilog
+
+showInterfaceMode :: FilePath -> Mode
+showInterfaceMode fp = mkPostLoadMode (ShowInterface fp)
+
+stopBeforeMode :: StopPhase -> Mode
+stopBeforeMode phase = mkPostLoadMode (StopBefore phase)
+
+doEvalMode :: String -> Mode
+doEvalMode str = mkPostLoadMode (DoEval [str])
+
+doFrontendMode :: String -> Mode
+doFrontendMode str = mkPostLoadMode (DoFrontend (mkModuleName str))
+
+doBackpackMode :: Mode
+doBackpackMode = mkPostLoadMode DoBackpack
+
+mkPostLoadMode :: PostLoadMode -> Mode
+mkPostLoadMode = Right . Right
+
+isDoInteractiveMode :: Mode -> Bool
+isDoInteractiveMode (Right (Right DoInteractive)) = True
+isDoInteractiveMode _ = False
+
+isStopLnMode :: Mode -> Bool
+isStopLnMode (Right (Right (StopBefore NoStop))) = True
+isStopLnMode _ = False
+
+isDoMakeMode :: Mode -> Bool
+isDoMakeMode (Right (Right DoMake)) = True
+isDoMakeMode _ = False
+
+isDoEvalMode :: Mode -> Bool
+isDoEvalMode (Right (Right (DoEval _))) = True
+isDoEvalMode _ = False
+
+#if defined(HAVE_INTERNAL_INTERPRETER)
+isInteractiveMode :: PostLoadMode -> Bool
+isInteractiveMode DoInteractive = True
+isInteractiveMode _             = False
+#endif
+
+-- isInterpretiveMode: byte-code compiler involved
+isInterpretiveMode :: PostLoadMode -> Bool
+isInterpretiveMode DoInteractive = True
+isInterpretiveMode (DoEval _)    = True
+isInterpretiveMode _             = False
+
+needsInputsMode :: PostLoadMode -> Bool
+needsInputsMode DoMkDependHS    = True
+needsInputsMode (StopBefore _)  = True
+needsInputsMode DoMake          = True
+needsInputsMode DoVHDL          = True
+needsInputsMode DoVerilog       = True
+needsInputsMode DoSystemVerilog = True
+needsInputsMode _               = False
+
+-- True if we are going to attempt to link in this mode.
+-- (we might not actually link, depending on the GhcLink flag)
+isLinkMode :: PostLoadMode -> Bool
+isLinkMode (StopBefore NoStop) = True
+isLinkMode DoMake              = True
+isLinkMode DoRun               = True
+isLinkMode DoInteractive       = True
+isLinkMode (DoEval _)          = True
+isLinkMode _                   = False
+
+isCompManagerMode :: PostLoadMode -> Bool
+isCompManagerMode DoRun         = True
+isCompManagerMode DoMake        = True
+isCompManagerMode DoInteractive = True
+isCompManagerMode (DoEval _)    = True
+isCompManagerMode DoVHDL        = True
+isCompManagerMode DoVerilog     = True
+isCompManagerMode DoSystemVerilog = True
+isCompManagerMode _             = False
+
+-- -----------------------------------------------------------------------------
+-- Parsing the mode flag
+
+parseModeFlags :: [Located String]
+               -> IO (Mode, [String],
+                      [Located String],
+                      [Warn])
+parseModeFlags args = do
+  ((leftover, errs1, warns), (mModeFlag, units, errs2, flags')) <-
+        processCmdLineP mode_flags (Nothing, [], [], []) args
+  let mode = case mModeFlag of
+             Nothing     -> doMakeMode
+             Just (m, _) -> m
+
+  -- See Note [Handling errors when parsing command-line flags]
+  unless (null errs1 && null errs2) $ throwGhcException $ errorsToGhcException $
+      map (("on the commandline", )) $ map (unLoc . errMsg) errs1 ++ errs2
+
+  return (mode, units, flags' ++ leftover, warns)
+
+type ModeM = CmdLineP (Maybe (Mode, String), [String], [String], [Located String])
+  -- mode flags sometimes give rise to new DynFlags (eg. -C, see below)
+  -- so we collect the new ones and return them.
+
+mode_flags :: [Flag ModeM]
+mode_flags =
+  [  ------- help / version ----------------------------------------------
+    defFlag "?"                     (PassFlag (setMode showGhcUsageMode))
+  , defFlag "-help"                 (PassFlag (setMode showGhcUsageMode))
+  , defFlag "V"                     (PassFlag (setMode showVersionMode))
+  , defFlag "-version"              (PassFlag (setMode showVersionMode))
+  , defFlag "-numeric-version"      (PassFlag (setMode showNumVersionMode))
+  , defFlag "-info"                 (PassFlag (setMode showInfoMode))
+  , defFlag "-show-options"         (PassFlag (setMode showOptionsMode))
+  , defFlag "-supported-languages"  (PassFlag (setMode showSupportedExtensionsMode))
+  , defFlag "-supported-extensions" (PassFlag (setMode showSupportedExtensionsMode))
+  , defFlag "-show-packages"        (PassFlag (setMode showUnitsMode))
+  ] ++
+  [ defFlag k'                      (PassFlag (setMode (printSetting k)))
+  | k <- ["Project version",
+          "Project Git commit id",
+          "Booter version",
+          "Stage",
+          "Build platform",
+          "Host platform",
+          "Target platform",
+          "Have interpreter",
+          "Object splitting supported",
+          "Have native code generator",
+          "Support SMP",
+          "Unregisterised",
+          "Tables next to code",
+          "RTS ways",
+          "Leading underscore",
+          "Debug on",
+          "LibDir",
+          "Global Package DB",
+          "C compiler flags",
+          "C compiler link flags"
+          ],
+    let k' = "-print-" ++ map (replaceSpace . toLower) k
+        replaceSpace ' ' = '-'
+        replaceSpace c   = c
+  ] ++
+      ------- interfaces ----------------------------------------------------
+  [ defFlag "-show-iface"  (HasArg (\f -> setMode (showInterfaceMode f)
+                                               "--show-iface"))
+
+      ------- primary modes ------------------------------------------------
+  , defFlag "c"            (PassFlag (\f -> do setMode (stopBeforeMode NoStop) f
+                                               addFlag "-no-link" f))
+  , defFlag "M"            (PassFlag (setMode doMkDependHSMode))
+  , defFlag "E"            (PassFlag (setMode (stopBeforeMode StopPreprocess )))
+  , defFlag "C"            (PassFlag (setMode (stopBeforeMode StopC)))
+  , defFlag "S"            (PassFlag (setMode (stopBeforeMode StopAs)))
+  , defFlag "-run"         (PassFlag (setMode doRunMode))
+  , defFlag "-make"        (PassFlag (setMode doMakeMode))
+  , defFlag "unit"         (SepArg   (\s -> addUnit s "-unit"))
+  , defFlag "-backpack"    (PassFlag (setMode doBackpackMode))
+  , defFlag "-interactive" (PassFlag (setMode doInteractiveMode))
+  , defFlag "-abi-hash"    (PassFlag (setMode doAbiHashMode))
+  , defFlag "e"            (SepArg   (\s -> setMode (doEvalMode s) "-e"))
+  , defFlag "-frontend"    (SepArg   (\s -> setMode (doFrontendMode s) "-frontend"))
+  , defFlag "-vhdl"        (PassFlag (setMode doVHDLMode))
+  , defFlag "-verilog"     (PassFlag (setMode doVerilogMode))
+  , defFlag "-systemverilog" (PassFlag (setMode doSystemVerilogMode))
+  ]
+
+addUnit :: String -> String -> EwM ModeM ()
+addUnit unit_str _arg = liftEwM $ do
+  (mModeFlag, units, errs, flags') <- getCmdLineState
+  putCmdLineState (mModeFlag, unit_str:units, errs, flags')
+
+setMode :: Mode -> String -> EwM ModeM ()
+setMode newMode newFlag = liftEwM $ do
+    (mModeFlag, units, errs, flags') <- getCmdLineState
+    let (modeFlag', errs') =
+            case mModeFlag of
+            Nothing -> ((newMode, newFlag), errs)
+            Just (oldMode, oldFlag) ->
+                case (oldMode, newMode) of
+                    -- -c/--make are allowed together, and mean --make -no-link
+                    _ |  isStopLnMode oldMode && isDoMakeMode newMode
+                      || isStopLnMode newMode && isDoMakeMode oldMode ->
+                      ((doMakeMode, "--make"), [])
+
+                    -- If we have both --help and --interactive then we
+                    -- want showGhciUsage
+                    _ | isShowGhcUsageMode oldMode &&
+                        isDoInteractiveMode newMode ->
+                            ((showGhciUsageMode, oldFlag), [])
+                      | isShowGhcUsageMode newMode &&
+                        isDoInteractiveMode oldMode ->
+                            ((showGhciUsageMode, newFlag), [])
+
+                    -- If we have both -e and --interactive then -e always wins
+                    _ | isDoEvalMode oldMode &&
+                        isDoInteractiveMode newMode ->
+                            ((oldMode, oldFlag), [])
+                      | isDoEvalMode newMode &&
+                        isDoInteractiveMode oldMode ->
+                            ((newMode, newFlag), [])
+
+                    -- Otherwise, --help/--version/--numeric-version always win
+                      | isDominantFlag oldMode -> ((oldMode, oldFlag), [])
+                      | isDominantFlag newMode -> ((newMode, newFlag), [])
+                    -- We need to accumulate eval flags like "-e foo -e bar"
+                    (Right (Right (DoEval esOld)),
+                     Right (Right (DoEval [eNew]))) ->
+                        ((Right (Right (DoEval (eNew : esOld))), oldFlag),
+                         errs)
+                    -- Saying e.g. --interactive --interactive is OK
+                    _ | oldFlag == newFlag -> ((oldMode, oldFlag), errs)
+
+                    -- --interactive and --show-options are used together
+                    (Right (Right DoInteractive), Left (ShowOptions _)) ->
+                      ((Left (ShowOptions True),
+                        "--interactive --show-options"), errs)
+                    (Left (ShowOptions _), (Right (Right DoInteractive))) ->
+                      ((Left (ShowOptions True),
+                        "--show-options --interactive"), errs)
+                    -- Otherwise, complain
+                    _ -> let err = flagMismatchErr oldFlag newFlag
+                         in ((oldMode, oldFlag), err : errs)
+    putCmdLineState (Just modeFlag', units, errs', flags')
+  where isDominantFlag f = isShowGhcUsageMode   f ||
+                           isShowGhciUsageMode  f ||
+                           isShowVersionMode    f ||
+                           isShowNumVersionMode f
+
+flagMismatchErr :: String -> String -> String
+flagMismatchErr oldFlag newFlag
+    = "cannot use `" ++ oldFlag ++  "' with `" ++ newFlag ++ "'"
+
+addFlag :: String -> String -> EwM ModeM ()
+addFlag s flag = liftEwM $ do
+  (m, units, e, flags') <- getCmdLineState
+  putCmdLineState (m, units, e, mkGeneralLocated loc s : flags')
+    where loc = "addFlag by " ++ flag ++ " on the commandline"
+
+-- ----------------------------------------------------------------------------
+-- Run --make mode
+
+doMake :: [String] -> [(String, Maybe Phase)] -> Ghc ()
+doMake units targets = do
+  hs_srcs <- case NE.nonEmpty units of
+    Just ne_units -> do
+      initMulti ne_units
+    Nothing -> do
+      s <- initMake targets
+      return $ map (uncurry (,Nothing,)) s
+  case hs_srcs of
+    [] -> return ()
+    _  -> do
+      targets' <- mapM (\(src, uid, phase) -> GHC.guessTarget src uid phase) hs_srcs
+      GHC.setTargets targets'
+      ok_flag <- GHC.load LoadAllTargets
+      when (failed ok_flag) (liftIO $ exitWith (ExitFailure 1))
+
+initMake :: [(String,Maybe Phase)] -> Ghc [(String, Maybe Phase)]
+initMake srcs  = do
+    let (hs_srcs, non_hs_srcs) = partition isHaskellishTarget srcs
+
+    hsc_env <- GHC.getSession
+
+    -- if we have no haskell sources from which to do a dependency
+    -- analysis, then just do one-shot compilation and/or linking.
+    -- This means that "ghc Foo.o Bar.o -o baz" links the program as
+    -- we expect.
+    if (null hs_srcs)
+       then liftIO (oneShot hsc_env NoStop srcs) >> return []
+       else do
+
+    o_files <- mapMaybeM (\x -> liftIO $ compileFile hsc_env NoStop x)
+                 non_hs_srcs
+    dflags <- GHC.getSessionDynFlags
+    let dflags' = dflags { ldInputs = map (FileOption "") o_files
+                                      ++ ldInputs dflags }
+    _ <- GHC.setSessionDynFlags dflags'
+    return hs_srcs
+
+-- Strip out any ["+RTS", ..., "-RTS"] sequences in the command string list.
+removeRTS :: [String] -> [String]
+removeRTS ("+RTS" : xs)  =
+  case dropWhile (/= "-RTS") xs of
+    [] -> []
+    (_ : ys) -> removeRTS ys
+removeRTS (y:ys)         = y : removeRTS ys
+removeRTS []             = []
+
+initMulti :: NE.NonEmpty String -> Ghc ([(String, Maybe UnitId, Maybe Phase)])
+initMulti unitArgsFiles  = do
+  hsc_env <- GHC.getSession
+  let logger = hsc_logger hsc_env
+  initial_dflags <- GHC.getSessionDynFlags
+
+  dynFlagsAndSrcs <- forM unitArgsFiles $ \f -> do
+    when (verbosity initial_dflags > 2) (liftIO $ print f)
+    args <- liftIO $ expandResponse [f]
+    (dflags2, fileish_args, warns) <- parseDynamicFlagsCmdLine initial_dflags (map (mkGeneralLocated f) (removeRTS args))
+    handleSourceError (\e -> do
+       GHC.printException e
+       liftIO $ exitWith (ExitFailure 1)) $ do
+         liftIO $ printOrThrowDiagnostics logger (initPrintConfig dflags2) (initDiagOpts dflags2) (GhcDriverMessage <$> warns)
+
+    let (dflags3, srcs, objs) = parseTargetFiles dflags2 (map unLoc fileish_args)
+        dflags4 = offsetDynFlags dflags3
+
+    let (hs_srcs, non_hs_srcs) = partition isHaskellishTarget srcs
+
+    -- This is dubious as the whole unit environment won't be set-up correctly, but
+    -- that doesn't matter for what we use it for (linking and oneShot)
+    let dubious_hsc_env = hscSetFlags dflags4 hsc_env
+    -- if we have no haskell sources from which to do a dependency
+    -- analysis, then just do one-shot compilation and/or linking.
+    -- This means that "ghc Foo.o Bar.o -o baz" links the program as
+    -- we expect.
+    if (null hs_srcs)
+       then liftIO (oneShot dubious_hsc_env NoStop srcs) >> return (dflags4, [])
+       else do
+
+    o_files <- mapMaybeM (\x -> liftIO $ compileFile dubious_hsc_env NoStop x)
+                 non_hs_srcs
+    let dflags5 = dflags4 { ldInputs = map (FileOption "") o_files
+                                      ++ ldInputs dflags4 }
+
+    liftIO $ checkOptions DoMake dflags5 srcs objs []
+
+    pure (dflags5, hs_srcs)
+
+  let
+    unitDflags = NE.map fst dynFlagsAndSrcs
+    srcs = NE.map (\(dflags, lsrcs) -> map (uncurry (,Just $ homeUnitId_ dflags,)) lsrcs) dynFlagsAndSrcs
+    (hs_srcs, _non_hs_srcs) = unzip (map (partition (\(file, _uid, phase) -> isHaskellishTarget (file, phase))) (NE.toList srcs))
+
+  checkDuplicateUnits initial_dflags (NE.toList (NE.zip unitArgsFiles unitDflags))
+
+  let (initial_home_graph, mainUnitId) = createUnitEnvFromFlags unitDflags
+      home_units = unitEnv_keys initial_home_graph
+
+  home_unit_graph <- forM initial_home_graph $ \homeUnitEnv -> do
+    let cached_unit_dbs = homeUnitEnv_unit_dbs homeUnitEnv
+        hue_flags = homeUnitEnv_dflags homeUnitEnv
+        dflags = homeUnitEnv_dflags homeUnitEnv
+    (dbs,unit_state,home_unit,mconstants) <- liftIO $ State.initUnits logger hue_flags cached_unit_dbs home_units
+
+    updated_dflags <- liftIO $ updatePlatformConstants dflags mconstants
+    pure $ HomeUnitEnv
+      { homeUnitEnv_units = unit_state
+      , homeUnitEnv_unit_dbs = Just dbs
+      , homeUnitEnv_dflags = updated_dflags
+      , homeUnitEnv_hpt = emptyHomePackageTable
+      , homeUnitEnv_home_unit = Just home_unit
+      }
+
+  checkUnitCycles initial_dflags home_unit_graph
+
+  let dflags = homeUnitEnv_dflags $ unitEnv_lookup mainUnitId home_unit_graph
+  unitEnv <- assertUnitEnvInvariant <$> (liftIO $ initUnitEnv mainUnitId home_unit_graph (ghcNameVersion dflags) (targetPlatform dflags))
+  let final_hsc_env = hsc_env { hsc_unit_env = unitEnv }
+
+  GHC.setSession final_hsc_env
+
+  -- if we have no haskell sources from which to do a dependency
+  -- analysis, then just do one-shot compilation and/or linking.
+  -- This means that "ghc Foo.o Bar.o -o baz" links the program as
+  -- we expect.
+  if (null hs_srcs)
+      then do
+        liftIO $ hPutStrLn stderr $ "Multi Mode can not be used for one-shot mode."
+        liftIO $ exitWith (ExitFailure 1)
+      else do
+
+{-
+  o_files <- liftIO $ mapMaybeM
+                (\(src, uid, mphase) ->
+                  compileFile (hscSetActiveHomeUnit (ue_unitHomeUnit (fromJust uid) unitEnv) final_hsc_env) NoStop (src, mphase)
+                )
+                (concat non_hs_srcs)
+                -}
+
+  -- MP: This should probably modify dflags for each unit?
+  --let dflags' = dflags { ldInputs = map (FileOption "") o_files
+  --                                  ++ ldInputs dflags }
+  return $ concat hs_srcs
+
+-- | Check that we don't have multiple units with the same UnitId.
+
+checkUnitCycles :: DynFlags -> UnitEnvGraph HomeUnitEnv -> Ghc ()
+checkUnitCycles dflags graph = processSCCs sccs
+  where
+    mkNode :: (UnitId, HomeUnitEnv) -> Node UnitId UnitId
+    mkNode (uid, hue) = DigraphNode uid uid (homeUnitDepends (homeUnitEnv_units hue))
+    nodes = map mkNode (unitEnv_elts graph)
+
+    sccs = stronglyConnCompFromEdgedVerticesOrd nodes
+
+    processSCCs [] = return ()
+    processSCCs (AcyclicSCC _: other_sccs) = processSCCs other_sccs
+    processSCCs (CyclicSCC uids: _) = throwGhcException $ CmdLineError $ showSDoc dflags (cycle_err uids)
+
+
+    cycle_err uids =
+      hang (text "Units form a dependency cycle:")
+           2
+           (one_err uids)
+
+    one_err uids = vcat $
+                    (map (\uid -> text "-" <+> ppr uid <+> text "depends on") start)
+                    ++ [text "-" <+> ppr final]
+      where
+        start = init uids
+        final = last uids
+
+checkDuplicateUnits :: DynFlags -> [(FilePath, DynFlags)] -> Ghc ()
+checkDuplicateUnits dflags flags =
+  unless (null duplicate_ids)
+         (throwGhcException $ CmdLineError $ showSDoc dflags multi_err)
+
+  where
+    uids = map (second homeUnitId_) flags
+    deduplicated_uids = ordNubOn snd uids
+    duplicate_ids = Set.fromList (map snd uids \\ map snd deduplicated_uids)
+
+    duplicate_flags = filter (flip Set.member duplicate_ids . snd) uids
+
+    one_err (fp, home_uid) = text "-" <+> ppr home_uid <+> text "defined in" <+> text fp
+
+    multi_err =
+      hang (text "Multiple units with the same unit-id:")
+           2
+           (vcat (map one_err duplicate_flags))
+
+
+offsetDynFlags :: DynFlags -> DynFlags
+offsetDynFlags dflags =
+  dflags { hiDir = c hiDir
+         , objectDir  = c objectDir
+         , stubDir = c stubDir
+         , hieDir  = c hieDir
+         , dumpDir = c dumpDir  }
+
+  where
+    c f = augment_maybe (f dflags)
+
+    augment_maybe Nothing = Nothing
+    augment_maybe (Just f) = Just (augment f)
+    augment f | isRelative f, Just offset <- workingDirectory dflags = offset </> f
+              | otherwise = f
+
+
+createUnitEnvFromFlags :: NE.NonEmpty DynFlags -> (HomeUnitGraph, UnitId)
+createUnitEnvFromFlags unitDflags =
+  let
+    newInternalUnitEnv dflags = mkHomeUnitEnv dflags emptyHomePackageTable Nothing
+    unitEnvList = NE.map (\dflags -> (homeUnitId_ dflags, newInternalUnitEnv dflags)) unitDflags
+    activeUnit = fst $ NE.head unitEnvList
+  in
+    (unitEnv_new (Map.fromList (NE.toList (unitEnvList))), activeUnit)
+
+-- ---------------------------------------------------------------------------
+-- Various banners and verbosity output.
+
+showBanner :: PostLoadMode -> DynFlags -> IO ()
+showBanner _postLoadMode dflags = do
+   let verb = verbosity dflags
+
+#if defined(HAVE_INTERNAL_INTERPRETER)
+   -- Show the GHCi banner
+   when (isInteractiveMode _postLoadMode && verb >= 1) $ putStrLn ghciWelcomeMsg
+#endif
+
+   -- Display details of the configuration in verbose mode
+   when (verb >= 2) $
+    do hPutStr stderr "Glasgow Haskell Compiler, Version "
+       hPutStr stderr cProjectVersion
+       hPutStr stderr ", stage "
+       hPutStr stderr cStage
+       hPutStr stderr " booted by GHC version "
+       hPutStrLn stderr cBooterVersion
+
+-- We print out a Read-friendly string, but a prettier one than the
+-- Show instance gives us
+showInfo :: DynFlags -> IO ()
+showInfo dflags = do
+        let sq x = " [" ++ x ++ "\n ]"
+        putStrLn $ sq $ intercalate "\n ," $ map show $ compilerInfo dflags
+
+-- TODO use GHC.Utils.Error once that is disentangled from all the other GhcMonad stuff?
+showSupportedExtensions :: Maybe String -> IO ()
+showSupportedExtensions m_top_dir = do
+  res <- runExceptT $ do
+    top_dir <- lift (tryFindTopDir m_top_dir) >>= \case
+      Nothing -> throwE $ SettingsError_MissingData "Could not find the top directory, missing -B flag"
+      Just dir -> pure dir
+    initSettings top_dir
+  arch_os <- case res of
+    Right s -> pure $ platformArchOS $ sTargetPlatform s
+    Left (SettingsError_MissingData msg) -> do
+      hPutStrLn stderr $ "WARNING: " ++ show msg
+      hPutStrLn stderr $ "cannot know target platform so guessing target == host (native compiler)."
+      pure hostPlatformArchOS
+    Left (SettingsError_BadData msg) -> do
+      hPutStrLn stderr msg
+      exitWith $ ExitFailure 1
+  mapM_ putStrLn $ supportedLanguagesAndExtensions arch_os
+
+showVersion :: IO ()
+showVersion = putStrLn $ concat [ "Clash, version "
+                                , Data.Version.showVersion Paths_clash_ghc.version
+                                , " (using clash-lib, version: "
+                                , Data.Version.showVersion clashLibVersion
+                                , ")"
+                                ]
+
+showOptions :: Bool -> IORef ClashOpts -> IO ()
+showOptions isInteractive = putStr . unlines . availableOptions
+    where
+      availableOptions opts = concat [
+        flagsForCompletion isInteractive,
+        map ('-':) (getFlagNames mode_flags),
+        map ('-':) (getFlagNames (flagsClash opts))
+        ]
+      getFlagNames opts         = map flagName opts
+
+showGhcUsage :: DynFlags -> IO ()
+showGhcUsage = showUsage False
+
+showGhciUsage :: DynFlags -> IO ()
+showGhciUsage = showUsage True
+
+showUsage :: Bool -> DynFlags -> IO ()
+showUsage ghci dflags = do
+  let usage_path = if ghci then ghciUsagePath dflags
+                           else ghcUsagePath dflags
+  usage <- readFile usage_path
+  progName <- getProgName
+  dump progName usage
+  where
+    dump progName xs = case xs of
+      ""        -> return ()
+      '$':'$':s -> putStr progName >> dump progName s
+      c:s       -> putChar c >> dump progName s
+
+dumpFinalStats :: Logger -> IO ()
+dumpFinalStats logger = do
+  when (logHasDumpFlag logger Opt_D_faststring_stats) $ dumpFastStringStats logger
+
+  when (logHasDumpFlag logger Opt_D_dump_faststrings) $ do
+    fss <- getFastStringTable
+    let ppr_table         = fmap ppr_segment (fss `zip` [0..])
+        ppr_segment (s,n) = hang (text "Segment" <+> int n) 2 (vcat (fmap ppr_bucket (s `zip` [0..])))
+        ppr_bucket  (b,n) = hang (text "Bucket" <+> int n) 2 (vcat (fmap ftext b))
+    putDumpFileMaybe logger Opt_D_dump_faststrings "FastStrings" FormatText (vcat ppr_table)
+
+dumpFastStringStats :: Logger -> IO ()
+dumpFastStringStats logger = do
+  segments <- getFastStringTable
+  hasZ <- getFastStringZEncCounter
+  let buckets = concat segments
+      bucketsPerSegment = map length segments
+      entriesPerBucket = map length buckets
+      entries = sum entriesPerBucket
+      msg = text "FastString stats:" $$ nest 4 (vcat
+        [ text "segments:         " <+> int (length segments)
+        , text "buckets:          " <+> int (sum bucketsPerSegment)
+        , text "entries:          " <+> int entries
+        , text "largest segment:  " <+> int (maximum bucketsPerSegment)
+        , text "smallest segment: " <+> int (minimum bucketsPerSegment)
+        , text "longest bucket:   " <+> int (maximum entriesPerBucket)
+        , text "has z-encoding:   " <+> (hasZ `pcntOf` entries)
+        ])
+        -- we usually get more "has z-encoding" than "z-encoded", because
+        -- when we z-encode a string it might hash to the exact same string,
+        -- which is not counted as "z-encoded".  Only strings whose
+        -- Z-encoding is different from the original string are counted in
+        -- the "z-encoded" total.
+  putMsg logger msg
+  where
+   x `pcntOf` y = int ((x * 100) `quot` y) Outputable.<> char '%'
+
+showUnits, dumpUnits, dumpUnitsSimple :: HscEnv -> IO ()
+showUnits       hsc_env = putStrLn (showSDoc (hsc_dflags hsc_env) (pprUnits (hsc_units hsc_env)))
+dumpUnits       hsc_env = putMsg (hsc_logger hsc_env) (pprUnits (hsc_units hsc_env))
+dumpUnitsSimple hsc_env = putMsg (hsc_logger hsc_env) (pprUnitsSimple (hsc_units hsc_env))
+
+-- -----------------------------------------------------------------------------
+-- Frontend plugin support
+
+doFrontend :: ModuleName -> [(String, Maybe Phase)] -> Ghc ()
+doFrontend modname srcs = do
+    hsc_env <- getSession
+    (frontend_plugin, _pkgs, _deps) <- liftIO $ loadFrontendPlugin hsc_env modname -- TODO do these need to recorded?
+    frontend frontend_plugin
+      (reverse $ frontendPluginOpts (hsc_dflags hsc_env)) srcs
+
+-- -----------------------------------------------------------------------------
+-- ABI hash support
+
+{-
+        ghc --abi-hash Data.Foo System.Bar
+
+Generates a combined hash of the ABI for modules Data.Foo and
+System.Bar.  The modules must already be compiled, and appropriate -i
+options may be necessary in order to find the .hi files.
+
+This is used by Cabal for generating the ComponentId for a
+package.  The ComponentId must change when the visible ABI of
+the package changes, so during registration Cabal calls ghc --abi-hash
+to get a hash of the package's ABI.
+-}
+
+-- | Print ABI hash of input modules.
+--
+-- The resulting hash is the MD5 of the GHC version used (#5328,
+-- see 'hiVersion') and of the existing ABI hash from each module (see
+-- 'mi_mod_hash').
+abiHash :: [String] -- ^ List of module names
+        -> Ghc ()
+abiHash strs = do
+  hsc_env <- getSession
+  let dflags    = hsc_dflags hsc_env
+
+  liftIO $ do
+
+  let find_it str = do
+         let modname = mkModuleName str
+         r <- findImportedModule hsc_env modname NoPkgQual
+         case r of
+           Found _ m -> return m
+           _error    ->
+            let opts   = initIfaceMessageOpts dflags
+                err_txt = missingInterfaceErrorDiagnostic opts
+                        $ cannotFindModule hsc_env modname r
+            in throwGhcException . CmdLineError $ showSDoc dflags err_txt
+
+  mods <- mapM find_it strs
+
+  let get_iface modl = loadUserInterface NotBoot (text "abiHash") modl
+  ifaces <- initIfaceCheck (text "abiHash") hsc_env $ mapM get_iface mods
+
+  bh <- openBinMem (3*1024) -- just less than a block
+  put_ bh hiVersion
+    -- package hashes change when the compiler version changes (for now)
+    -- see #5328
+  mapM_ (put_ bh . mi_mod_hash . mi_final_exts) ifaces
+  f <- fingerprintBinMem bh
+
+  putStrLn (showPpr dflags f)
+
+-----------------------------------------------------------------------------
+-- HDL Generation
+
+makeHDL'
+  :: forall backend
+   . Clash.Backend.Backend backend
+  => Proxy backend
+  -> Ghc ()
+  -> IORef ClashOpts
+  -> [(String,Maybe Phase)]
+  -> Ghc ()
+makeHDL' _     _           _ []   = throwGhcException (CmdLineError "No input files")
+makeHDL' proxy startAction r srcs = makeHDL proxy startAction r $ fmap fst srcs
+
+makeVHDL :: Ghc () -> IORef ClashOpts -> [(String, Maybe Phase)] -> Ghc ()
+makeVHDL = makeHDL' (Proxy @VHDLState)
+
+makeVerilog :: Ghc () -> IORef ClashOpts -> [(String, Maybe Phase)] -> Ghc ()
+makeVerilog = makeHDL' (Proxy @VerilogState)
+
+makeSystemVerilog :: Ghc () -> IORef ClashOpts -> [(String, Maybe Phase)] -> Ghc ()
+makeSystemVerilog = makeHDL' (Proxy @SystemVerilogState)
+
+-- -----------------------------------------------------------------------------
+-- Util
+
+unknownFlagsErr :: [String] -> a
+unknownFlagsErr fs = throwGhcException $ UsageError $ concatMap oneError fs
+  where
+    oneError f =
+        "unrecognised flag: " ++ f ++ "\n" ++
+        (case flagSuggestions (nubSort allNonDeprecatedFlags) f of
+            [] -> ""
+            suggs -> "did you mean one of:\n" ++ unlines (map ("  " ++) suggs))
diff --git a/src-bin-9.2/Clash/GHCi/UI.hs b/src-bin-9.2/Clash/GHCi/UI.hs
--- a/src-bin-9.2/Clash/GHCi/UI.hs
+++ b/src-bin-9.2/Clash/GHCi/UI.hs
@@ -166,6 +166,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 import           Clash.GHC.Evaluator
 import           Clash.GHC.GenerateBindings
@@ -2307,7 +2308,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-9.4/Clash/GHCi/UI.hs b/src-bin-9.4/Clash/GHCi/UI.hs
--- a/src-bin-9.4/Clash/GHCi/UI.hs
+++ b/src-bin-9.4/Clash/GHCi/UI.hs
@@ -173,6 +173,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 import           Clash.GHC.Evaluator
 import           Clash.GHC.GenerateBindings
@@ -2391,7 +2392,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-9.6/Clash/GHCi/UI.hs b/src-bin-9.6/Clash/GHCi/UI.hs
--- a/src-bin-9.6/Clash/GHCi/UI.hs
+++ b/src-bin-9.6/Clash/GHCi/UI.hs
@@ -176,6 +176,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 import           Clash.GHC.Evaluator
 import           Clash.GHC.GenerateBindings
@@ -2412,7 +2413,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-bin-9.8/Clash/GHCi/UI.hs b/src-bin-9.8/Clash/GHCi/UI.hs
--- a/src-bin-9.8/Clash/GHCi/UI.hs
+++ b/src-bin-9.8/Clash/GHCi/UI.hs
@@ -178,6 +178,7 @@
 import           Clash.Backend.VHDL (VHDLState)
 import           Clash.Backend.Verilog (VerilogState)
 import qualified Clash.Driver
+import           Clash.Driver.Bool (fromGhcOverridingBool)
 import           Clash.Driver.Types (ClashOpts(..), ClashEnv(..), ClashDesign(..))
 import           Clash.GHC.Evaluator
 import           Clash.GHC.GenerateBindings
@@ -2413,7 +2414,7 @@
   dflags <- GHC.getSessionDynFlags
   liftIO $ do startTime <- Clock.getCurrentTime
               opts0  <- readIORef optsRef
-              let opts1  = opts0 { opt_color = useColor dflags }
+              let opts1  = opts0 { opt_color = fromGhcOverridingBool (useColor dflags) }
               let iw     = opt_intWidth opts1
                   hdl    = hdlKind backend
                   -- determine whether `-outputdir` was used
diff --git a/src-ghc/Clash/GHC/Evaluator.hs b/src-ghc/Clash/GHC/Evaluator.hs
--- a/src-ghc/Clash/GHC/Evaluator.hs
+++ b/src-ghc/Clash/GHC/Evaluator.hs
@@ -1,6 +1,6 @@
 {-|
   Copyright   :  (C) 2017-2022, Google Inc.,
-                     2021-2022, QBayLogic B.V.
+                     2021-2024, QBayLogic B.V.
   License     :  BSD2 (see the file LICENSE)
   Maintainer  :  QBayLogic B.V. <devops@qbaylogic.com>
 
@@ -22,9 +22,11 @@
 
 import           Prelude                                 hiding (lookup)
 
-import           Control.Concurrent.Supply               (Supply, freshId)
 import           Data.Either                             (lefts,rights)
-import           Data.List                               (foldl',mapAccumL)
+import           Data.List                               (mapAccumL)
+#if !MIN_VERSION_base(4,20,0)
+import           Data.List                               (foldl')
+#endif
 import qualified Data.Primitive.ByteArray                as BA
 import qualified Data.Text as Text
 #if MIN_VERSION_base(4,15,0)
@@ -52,6 +54,7 @@
 import qualified Clash.Normalize.Primitives as NP (removedArg, undefined, undefinedX)
 import           Clash.Unique
 import           Clash.Util                              (curLoc)
+import           Clash.Util.Supply                (Supply, freshId)
 
 import           Clash.GHC.Evaluator.Primitive
 
@@ -265,19 +268,22 @@
 -- for each one around the given term.
 --
 newBinder :: [Either TyVar Type] -> Term -> Step
-newBinder tys x m tcm =
-  let (s', iss', x') = mkAbstr (mSupply m, mScopeNames m, x) tys
-      m' = m { mSupply = s', mScopeNames = iss', mTerm = x' }
-   in ghcStep m' tcm
+newBinder tys e m tcm =
+  let ((supply1,_), e1) = etaExpand (mSupply m, mScopeNames m) tys
+      m1 = m { mSupply = supply1, mTerm = e1 }
+   in ghcStep m1 tcm
  where
-  mkAbstr = foldr go
-    where
-      go (Left tv) (s', iss', e') =
-        (s', iss', TyLam tv (TyApp e' (VarTy tv)))
+  etaExpand env args =
+    let (env1,args1) = mapAccumL go env args
+     in (env1,mkAbstraction (foldl' go2 e args1) args1)
 
-      go (Right ty) (s', iss', e') =
-        let ((s'', _), n) = mkUniqSystemId (s', iss') ("x", ty)
-        in  (s'', iss' ,Lam n (App e' (Var n)))
+  go env (Left tv) = (env, Right tv)
+  go env (Right ty) =
+    let (env1, n) = mkUniqSystemId env ("x", ty)
+     in (env1, Left n)
+
+  go2 u (Left i) = App u (Var i)
+  go2 u (Right tv) = TyApp u (VarTy tv)
 
 newLetBinding
   :: TyConMap
diff --git a/src-ghc/Clash/GHC/Evaluator/Primitive.hs b/src-ghc/Clash/GHC/Evaluator/Primitive.hs
--- a/src-ghc/Clash/GHC/Evaluator/Primitive.hs
+++ b/src-ghc/Clash/GHC/Evaluator/Primitive.hs
@@ -2,7 +2,7 @@
   Copyright   :  (C) 2013-2016, University of Twente,
                      2016-2017, Myrtle Software Ltd,
                      2017-2022, Google Inc.,
-                     2017-2023, QBayLogic B.V.
+                     2017-2024, QBayLogic B.V.
   License     :  BSD2 (see the file LICENSE)
   Maintainer  :  QBayLogic B.V. <devops@qbaylogic.com>
 -}
@@ -25,7 +25,6 @@
   , isUndefinedXPrimVal
   ) where
 
-import           Control.Concurrent.Supply  (Supply,freshId)
 import           Control.DeepSeq            (force)
 import           Control.Exception          (ArithException(..), Exception, tryJust, evaluate)
 import           Control.Monad.State.Strict (State, MonadState)
@@ -43,6 +42,7 @@
 import           Data.Reflection     (reifyNat)
 import           Data.Text           (Text)
 import qualified Data.Text           as Text
+import           Data.Text.Extra     (showt)
 import           GHC.Exts (IsList(..))
 import           GHC.Float
 import           GHC.Int
@@ -81,14 +81,12 @@
 import           GHC.Builtin.Names   (trueDataConKey, falseDataConKey)
 import qualified GHC.Core.TyCon      as TyCon
 import           GHC.Builtin.Types   (tupleTyCon)
-import           GHC.Types.Unique    (getKey)
 #else
 import           BasicTypes          (Boxity (..))
 import           Name                (getSrcSpan, nameOccName, occNameString)
 import           PrelNames           (trueDataConKey, falseDataConKey)
 import qualified TyCon
 import           TysWiredIn          (tupleTyCon)
-import           Unique              (getKey)
 #endif
 
 import           Clash.Class.BitPack (pack,unpack)
@@ -115,8 +113,10 @@
 import qualified Clash.Data.UniqMap as UniqMap
 import           Clash.Debug
 import           Clash.GHC.GHC2Core  (modNameM)
+import           Clash.Unique        (fromGhcUnique)
 import           Clash.Util
   (MonadUnique (..), clogBase, flogBase, curLoc)
+import           Clash.Util.Supply   (Supply,freshId)
 import           Clash.Normalize.PrimitiveReductions
   (typeNatMul, typeNatSub, typeNatAdd, vecLastPrim, vecInitPrim, vecHeadPrim,
    vecTailPrim, mkVecCons, mkVecNil)
@@ -202,7 +202,7 @@
                        , "Clash.Sized.Vector.replace_int"
                        , "GHC.Classes.&&"
                        , "GHC.Classes.||"
-                       , "Clash.Class.BitPack.Internal.xToBV"
+                       , showt 'BitVector.xToBV
                        , "Clash.Sized.Vector.imap_go"
                        ]
   = if isUndefinedPrimVal v then
@@ -486,7 +486,7 @@
     -> reduce . integerToWordLiteral . toInteger . popCount . (fromInteger :: Integer -> Word16) $ i
   "GHC.Prim.popCnt32#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . popCount . (fromInteger :: Integer -> Word32) $ i
-  "GHC.Prim.popCnt64#" | [i] <- wordLiterals' args
+  "GHC.Prim.popCnt64#" | [i] <- word64Literals' args
     -> reduce . integerToWordLiteral . toInteger . popCount . (fromInteger :: Integer -> Word64) $ i
   "GHC.Prim.popCnt#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . popCount . (fromInteger :: Integer -> Word) $ i
@@ -497,7 +497,7 @@
     -> reduce . integerToWordLiteral . toInteger . countLeadingZeros . (fromInteger :: Integer -> Word16) $ i
   "GHC.Prim.clz32#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . countLeadingZeros . (fromInteger :: Integer -> Word32) $ i
-  "GHC.Prim.clz64#" | [i] <- wordLiterals' args
+  "GHC.Prim.clz64#" | [i] <- word64Literals' args
     -> reduce . integerToWordLiteral . toInteger . countLeadingZeros . (fromInteger :: Integer -> Word64) $ i
   "GHC.Prim.clz#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . countLeadingZeros . (fromInteger :: Integer -> Word) $ i
@@ -508,7 +508,7 @@
     -> reduce . integerToWordLiteral . toInteger . countTrailingZeros . (fromInteger :: Integer -> Word) $ i .&. (bit 16 - 1)
   "GHC.Prim.ctz32#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . countTrailingZeros . (fromInteger :: Integer -> Word) $ i .&. (bit 32 - 1)
-  "GHC.Prim.ctz64#" | [i] <- wordLiterals' args
+  "GHC.Prim.ctz64#" | [i] <- word64Literals' args
     -> reduce . integerToWordLiteral . toInteger . countTrailingZeros . (fromInteger :: Integer -> Word64) $ i .&. (bit 64 - 1)
   "GHC.Prim.ctz#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . countTrailingZeros . (fromInteger :: Integer -> Word) $ i
@@ -517,7 +517,7 @@
     -> reduce . integerToWordLiteral . toInteger . byteSwap16 . (fromInteger :: Integer -> Word16) $ i
   "GHC.Prim.byteSwap32#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . byteSwap32 . (fromInteger :: Integer -> Word32) $ i
-  "GHC.Prim.byteSwap64#" | [i] <- wordLiterals' args
+  "GHC.Prim.byteSwap64#" | [i] <- word64Literals' args
     -> reduce . integerToWordLiteral . toInteger . byteSwap64 . (fromInteger :: Integer -> Word64) $ i
   "GHC.Prim.byteSwap#" | [i] <- wordLiterals' args -- assume 64bits
     -> reduce . integerToWordLiteral . toInteger . byteSwap64 . (fromInteger :: Integer -> Word64) $ i
@@ -531,7 +531,7 @@
     -> reduce . integerToWordLiteral . toInteger . bitReverse16 . fromInteger $ i
   "GHC.Prim.bitReverse32#" | [i] <- wordLiterals' args
     -> reduce . integerToWordLiteral . toInteger . bitReverse32 . fromInteger $ i
-  "GHC.Prim.bitReverse64#" | [i] <- wordLiterals' args
+  "GHC.Prim.bitReverse64#" | [i] <- word64Literals' args
     -> reduce . integerToWordLiteral . toInteger . bitReverse64 . fromInteger $ i
 #endif
 ------------
@@ -1415,6 +1415,14 @@
     | [DC dc _] <- args
     -> reduce (Literal (IntLiteral (toInteger (dcTag dc - 1))))
 
+  "GHC.Prim.dataToTagSmall#"
+    | [DC dc _] <- args
+    -> reduce (Literal (IntLiteral (toInteger (dcTag dc - 1))))
+
+  "GHC.Prim.dataToTagLarge#"
+    | [DC dc _] <- args
+    -> reduce (Literal (IntLiteral (toInteger (dcTag dc - 1))))
+
   "GHC.Classes.eqInt" | Just (i,j) <- intCLiterals args
     -> reduce (boolToBoolLiteral tcm ty (i == j))
 
@@ -1504,6 +1512,16 @@
     , Just c <- flogBase a b
     -> (reduce . Literal . WordLiteral . toInteger) c
 
+  "GHC.Internal.Float.integerToFloat#"
+    | [v] <- args
+    , Just i <- integerLiteral v
+    -> reduce . Literal . FloatLiteral . floatToWord $ F# (integerToFloat# i)
+
+  "GHC.Internal.Float.integerToDouble#"
+    | [v] <- args
+    , Just i <- integerLiteral v
+    -> reduce . Literal . DoubleLiteral . doubleToWord $ D# (integerToDouble# i)
+
   "GHC.Num.Integer.integerToFloat#"
     | [v] <- args
     , Just i <- integerLiteral v
@@ -1861,6 +1879,8 @@
     | [Lit l] <- args
     -> error ("IP: " <> show l)
   "GHC.Num.Integer.IN"
+    | [Lit (ByteArrayLiteral (BA.ByteArray ba))] <- args
+    -> reduce (Literal (IntegerLiteral (IN ba)))
     | [Lit l] <- args
     -> error ("IN: " <> show l)
 #else
@@ -2127,6 +2147,15 @@
     -> let resTy = getResultTy tcm ty tys
         in reduce (mkSomeNat tcm n resTy)
 
+  "GHC.Internal.TypeNats.natVal"
+    | [Lit (NaturalLiteral n), _] <- args
+    -> reduce (Literal (NaturalLiteral n))
+
+  "GHC.Internal.TypeNats.someNatVal"
+    | [Lit (NaturalLiteral n)] <- args
+    -> let resTy = getResultTy tcm ty tys
+        in reduce (mkSomeNat tcm n resTy)
+
   "GHC.Types.I#"
     | isSubj
     , [Lit (IntLiteral i)] <- args
@@ -2442,7 +2471,7 @@
            val = unpack (toBV i :: BitVector 64)
         in reduce (mkDoubleCLit tcm val resTy)
 
-  "Clash.Class.BitPack.Internal.xToBV"
+  "Clash.Sized.Internal.BitVector.xToBV"
     | isSubj
     , Just (nTy, kn) <- extractKnownNat tcm tys
     -- The second argument to `xToBV` is always going to be suspended.
@@ -4607,12 +4636,38 @@
            snat = mkApps (Data snatDc) [Right nTy, Left (Literal (NaturalLiteral n))]
            ret = mkApps (valToTerm fun) [Right nTy, Left snat]
         in reduce ret
+  "GHC.Internal.TypeNats.withSomeSNat"
+    | Lit (NaturalLiteral n) : fun : _ <- args
+    , _ : funTy : _ <- Either.rights (fst (splitFunForallTy ty))
+    , (tyView -> TyConApp snatTcNm _) : _ <- Either.rights (fst (splitFunForallTy funTy))
+    , Just snatTc <- UniqMap.lookup snatTcNm tcm
+    , [snatDc] <- tyConDataCons snatTc
+    -> let nTy = LitTy (NumTy n)
+           snat = mkApps (Data snatDc) [Right nTy, Left (Literal (NaturalLiteral n))]
+           ret = mkApps (valToTerm fun) [Right nTy, Left snat]
+        in reduce ret
   "GHC.Magic.nospec"
     | [arg] <- args
     -> reduce (valToTerm arg)
   "GHC.Float.$wproperFractionDouble"
     | _ : Lit (DoubleLiteral d) : _ <- args
     , [sty@(tyView -> TyConApp signedTcNm [nTy@(LitTy (NumTy kn))])] <- tys
+    , nameOcc signedTcNm == showt ''Signed
+    , (_, tyView -> TyConApp tupTcNm tyArgs) <- splitFunForallTy ty
+    , Just tupTc <- UniqMap.lookup tupTcNm tcm
+    , [tupDc] <- tyConDataCons tupTc
+    -> let (sn, d1) = reifyNat kn (\p -> first toInteger (op p (wordToDouble d)))
+           ret = mkApps (Data tupDc) (map Right tyArgs ++
+                  [ Left (mkSignedLit sty nTy kn sn)
+                  , Left (mkDoubleCLit tcm (doubleToWord d1) (last tyArgs))
+                  ])
+        in reduce ret
+    where
+      op :: KnownNat n => Proxy n -> Double -> (Signed n, Double)
+      op _ = properFraction
+  "GHC.Internal.Float.$wproperFractionDouble"
+    | _ : Lit (DoubleLiteral d) : _ <- args
+    , [sty@(tyView -> TyConApp signedTcNm [nTy@(LitTy (NumTy kn))])] <- tys
     , nameOcc signedTcNm == "Clash.Sized.Internal.Signed.Signed"
     , (_, tyView -> TyConApp tupTcNm tyArgs) <- splitFunForallTy ty
     , Just tupTc <- UniqMap.lookup tupTcNm tcm
@@ -4864,16 +4919,20 @@
 word32Literal x = case x of
   Lit (Word32Literal i) -> Just i
   _ -> Nothing
+#endif
 
-#if MIN_VERSION_base(4,17,0)
 word64Literals' :: [Value] -> [Integer]
 word64Literals' = listOf word64Literal
 
+#if MIN_VERSION_base(4,17,0)
 word64Literal :: Value -> Maybe Integer
 word64Literal x = case x of
   Lit (Word64Literal i) -> Just i
   _ -> Nothing
-#endif
+#else
+-- Prior to GHC 9.4 Word64# didn't exist, 64 bit primitives took Word# instead
+word64Literal :: Value -> Maybe Integer
+word64Literal= wordLiteral
 #endif
 
 charLiterals :: [Value] -> Maybe (Char,Char)
@@ -5866,7 +5925,7 @@
   :: TyCon.TyCon
   -> TyConName
 ghcTyconToTyConName tc =
-    Name User n' (getKey (TyCon.tyConUnique tc)) (getSrcSpan n)
+    Name User n' (fromGhcUnique (TyCon.tyConUnique tc)) (getSrcSpan n)
   where
     n'      = fromMaybe "_INTERNAL_" (modNameM n) `Text.append`
               ('.' `Text.cons` Text.pack occName)
@@ -5877,5 +5936,5 @@
 svoid m0 = IO (\s -> case m0 s of s' -> (# s', () #))
 
 isTrueDC,isFalseDC :: DataCon -> Bool
-isTrueDC dc  = dcUniq dc == getKey trueDataConKey
-isFalseDC dc = dcUniq dc == getKey falseDataConKey
+isTrueDC dc  = dcUniq dc == fromGhcUnique trueDataConKey
+isFalseDC dc = dcUniq dc == fromGhcUnique falseDataConKey
diff --git a/src-ghc/Clash/GHC/GHC2Core.hs b/src-ghc/Clash/GHC/GHC2Core.hs
--- a/src-ghc/Clash/GHC/GHC2Core.hs
+++ b/src-ghc/Clash/GHC/GHC2Core.hs
@@ -2,7 +2,7 @@
   Copyright   :  (C) 2013-2016, University of Twente,
                      2016-2017, Myrtle Software Ltd,
                      2017-2022, Google Inc.
-                     2021,      QBayLogic B.V.,
+                     2021-2024, QBayLogic B.V.,
   License     :  BSD2 (see the file LICENSE)
   Maintainer  :  QBayLogic B.V. <devops@qbaylogic.com>
 -}
@@ -198,6 +198,7 @@
 import qualified Clash.Data.UniqMap          as C
 import           Clash.Normalize.Primitives  as C
 import           Clash.Primitives.Types      hiding (name)
+import           Clash.Unique                (fromGhcUnique)
 import           Clash.Util
 import           Clash.GHC.Util
 
@@ -623,6 +624,7 @@
               | f == "GHC.Stack.withFrozenCallStack"    -> return (withFrozenCallStackTerm xType)
               | f == "GHC.Magic.noinline"               -> return (idTerm xType)
               | f == "GHC.Magic.lazy"                   -> return (idTerm xType)
+              | f == "GHC.Magic.nospec"                 -> return (idTerm xType)
               | f == "GHC.Magic.runRW#"                 -> return (runRWTerm xType)
               | f == "Clash.Sized.Internal.BitVector.checkUnpackUndef" -> return (checkUnpackUndefTerm xType)
               | f == "Clash.Magic.prefixName"
@@ -701,9 +703,9 @@
         LitNumNatural -> C.NaturalLiteral i
 #endif
         LitNumInt     -> C.IntLiteral i
-        LitNumInt64   -> C.IntLiteral i
+        LitNumInt64   -> C.Int64Literal i
         LitNumWord    -> C.WordLiteral i
-        LitNumWord64  -> C.WordLiteral i
+        LitNumWord64  -> C.Word64Literal i
 #if MIN_VERSION_ghc(9,2,0)
         LitNumInt8    -> C.Int8Literal i
         LitNumInt16   -> C.Int16Literal i
@@ -770,7 +772,11 @@
   case tc1M of
     Just _ -> return tc1M
     _ -> hasPrimCo co2
+#if MIN_VERSION_ghc(9,10,0)
+hasPrimCo (ForAllCo {fco_body = co}) = hasPrimCo co
+#else
 hasPrimCo (ForAllCo _ _ co) = hasPrimCo co
+#endif
 
 hasPrimCo co@(AxiomInstCo _ _ coers) = do
     let (Pair ty1 _) = coercionKind co
@@ -1099,7 +1105,7 @@
   -> C2C (C.Name a)
 coreToName toName toUnique toString v = do
   ns <- toString (toName v)
-  let key  = getKey (toUnique v)
+  let key  = fromGhcUnique (toUnique v)
       locI = getSrcSpan (toName v)
       -- Is it one of [ds,ds1,ds2,..]
       isDSX = maybe False (maybe True (isDigit . fst) . Text.uncons) . Text.stripPrefix "ds"
diff --git a/src-ghc/Clash/GHC/GenerateBindings.hs b/src-ghc/Clash/GHC/GenerateBindings.hs
--- a/src-ghc/Clash/GHC/GenerateBindings.hs
+++ b/src-ghc/Clash/GHC/GenerateBindings.hs
@@ -88,6 +88,7 @@
 import qualified Clash.Data.UniqMap as UniqMap
 import           Clash.Debug             (traceIf)
 import           Clash.Driver            (compilePrimitive)
+import           Clash.Driver.Bool       (toGhcOverridingBool)
 import           Clash.Driver.Types      (BindingMap, Binding(..), IsPrim(..), ClashEnv(..), ClashDesign(..), ClashOpts(..))
 import           Clash.GHC.GHC2Core
   (C2C, GHC2CoreState, GHC2CoreEnv (..), tyConMap, coreToId, coreToName, coreToTerm,
@@ -98,6 +99,7 @@
 import           Clash.Primitives.Types
   (Primitive (..), CompiledPrimMap)
 import           Clash.Primitives.Util   (generatePrimMap)
+import           Clash.Unique            (Unique)
 import           Clash.Util              (reportTimeDiff)
 import qualified Clash.Util.Interpolate as I
 
@@ -133,7 +135,7 @@
    , partitionEithers -> (unresolvedPrims, pFP)
    , customBitRepresentations
    , primGuards
-   , domainConfs ) <- loadModules startAction (opt_color opts) hdl modName dflagsM importDirs
+   , domainConfs ) <- loadModules startAction (toGhcOverridingBool (opt_color opts)) hdl modName dflagsM importDirs
   startTime <- Clock.getCurrentTime
   primMapR <- generatePrimMap unresolvedPrims primGuards (concat [pFP, primDirs, importDirs])
   tdir <- maybe ghcLibDir (pure . GHC.topDir) dflagsM
@@ -399,15 +401,15 @@
       Just dictTy@(tyView -> TyConApp tcNm _)
         | Just tc <- UniqMap.lookup tcNm tcm
         , not (isNewTypeTc tc)
-        -> flip State.evalState (0 :: Int) $ do
+        -> flip State.evalState (0 :: Unique) $ do
               dcId <- mkInternalVar inScope0 "dict" dictTy
               let inScope1 = extendInScopeSet inScope0 dcId
               selE <- mkSelectorCase "mkClassSelector" inScope1 tcm (Var dcId) 1 sel
               return (mkTyLams (mkLams selE [dcId]) tvs)
-      Just (tyView -> FunTy arg res) -> flip State.evalState (0 :: Int) $ do
+      Just (tyView -> FunTy arg res) -> flip State.evalState (0 :: Unique) $ do
               dcId <- mkInternalVar inScope0 "dict" (mkFunTy arg res)
               return (mkTyLams (mkLams (Var dcId) [dcId]) tvs)
-      Just dictTy -> flip State.evalState (0 :: Int) $ do
+      Just dictTy -> flip State.evalState (0 :: Unique) $ do
               dcId <- mkInternalVar inScope0 "dict" dictTy
               return (mkTyLams (mkLams (Var dcId) [dcId]) tvs)
       Nothing -> error "mkClassSelector: expected at least one dictionary argument"
diff --git a/src-ghc/Clash/GHC/LoadInterfaceFiles.hs b/src-ghc/Clash/GHC/LoadInterfaceFiles.hs
--- a/src-ghc/Clash/GHC/LoadInterfaceFiles.hs
+++ b/src-ghc/Clash/GHC/LoadInterfaceFiles.hs
@@ -1,7 +1,7 @@
 {-|
   Copyright   :  (C) 2013-2016, University of Twente,
                      2016-2017, Myrtle Software Ltd
-                     2022,      QBayLogic B.V.
+                     2022-2024, QBayLogic B.V.
   License     :  BSD2 (see the file LICENSE)
   Maintainer  :  QBayLogic B.V. <devops@qbaylogic.com>
 -}
@@ -34,7 +34,9 @@
 import qualified Data.Sequence               as Seq
 import           Data.Sequence               (Seq)
 import           Data.Either                 (partitionEithers)
+#if !MIN_VERSION_base(4,20,0)
 import           Data.Foldable               (foldl')
+#endif
 import           Data.List                   (elemIndex)
 import qualified Data.Text                   as Text
 import           Data.Maybe                  (isNothing, mapMaybe, catMaybes)
diff --git a/src-ghc/Clash/GHC/LoadModules.hs b/src-ghc/Clash/GHC/LoadModules.hs
--- a/src-ghc/Clash/GHC/LoadModules.hs
+++ b/src-ghc/Clash/GHC/LoadModules.hs
@@ -1,13 +1,14 @@
 {-|
   Copyright   :  (C) 2013-2016, University of Twente,
                      2016-2017, Myrtle Software Ltd,
-                     2017     , Google Inc.
-                     2021-2023, QBayLogic B.V.
+                     2017-2024, Google Inc.
+                     2021-2024, QBayLogic B.V.
   License     :  BSD2 (see the file LICENSE)
   Maintainer  :  QBayLogic B.V. <devops@qbaylogic.com>
 -}
 
 {-# LANGUAGE CPP #-}
+{-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -38,9 +39,10 @@
 import           Control.Exception               (SomeException, throw)
 import           Control.Monad                   (forM, join, when)
 import           Data.List.Extra                 (nubSort)
-import           Control.Exception               (throwIO)
+import           Control.Exception               (Exception, throwIO)
 import           Control.Monad                   (foldM)
 #if MIN_VERSION_ghc(9,0,0)
+import           Control.Monad.Catch             (catch, throwM)
 import           Control.Monad.Catch             as MC (try)
 #endif
 import           Control.Monad.IO.Class          (liftIO)
@@ -52,7 +54,10 @@
 import           Data.HashMap.Strict             (HashMap)
 import qualified Data.HashMap.Strict             as HashMap
 import           Data.Typeable                   (Typeable)
-import           Data.List                       (foldl', nub, find)
+import           Data.List                       (nub, find)
+#if !MIN_VERSION_base(4,20,0)
+import           Data.List                       (foldl')
+#endif
 import qualified Data.Map                        as Map
 import           Data.Maybe
   (catMaybes, fromMaybe, listToMaybe, mapMaybe)
@@ -527,6 +532,26 @@
 varNameString :: Var.Var -> String
 varNameString = nameString . Var.varName
 
+data LoadModulesException = LoadModulesException
+  { moduleName :: String
+  , externalError :: String
+  , localError :: String
+  } deriving (Exception)
+
+instance Show LoadModulesException where
+  showsPrec :: Int -> LoadModulesException -> ShowS
+  showsPrec _ LoadModulesException{moduleName, externalError, localError} = showString [I.i|
+    Failed to load module '#{moduleName}'.
+
+    Tried to load it from precompiled sources, error was:
+
+      #{externalError}
+
+    Tried to load it from local sources, error was:
+
+      #{localError}
+  |]
+
 loadModules
   :: GHC.Ghc ()
   -- ^ Allows us to have some initial action, such as sharing a linker state
@@ -573,7 +598,21 @@
       -- We need to try and load external modules first, because we can't
       -- recover from errors in 'loadLocalModule'.
       loadExternalModule hdl modName >>= \case
-        Left _loadExternalErr -> loadLocalModule hdl modName
+#if MIN_VERSION_ghc(9,0,0)
+        Left loadExternalErr -> do
+          catch @_ @SomeException
+            (loadLocalModule hdl modName)
+            (\localError ->
+              throwM
+                (LoadModulesException
+                  { moduleName = modName
+                  , externalError = show loadExternalErr
+                  , localError = show localError
+                  }))
+#else
+        Left _loadExternalErr -> do
+          loadLocalModule hdl modName
+#endif
         Right res -> pure res
 
     let allBinderIds = map fst (CoreSyn.flattenBinds allBinders)
@@ -1022,7 +1061,9 @@
                , Opt_RegsGraph -- Don't care
                , Opt_RegsGraph -- Don't care
                , Opt_PedanticBottoms -- Stops eta-expansion through case: avoid
+#if !MIN_VERSION_ghc(9,10,0)
                , Opt_LlvmTBAA -- Don't care
+#endif
                , Opt_CmmSink -- Don't care
                , Opt_CmmElimCommonBlocks -- Don't care
                , Opt_OmitYields -- Don't care
@@ -1144,7 +1185,11 @@
     rmCD xcon                      = xcon
 #endif
 
-#if MIN_VERSION_ghc(9,4,0)
+#if MIN_VERSION_ghc(9,10,0)
+    rmGConDetails :: GHC.HsConDeclGADTDetails GHC.GhcPs -> GHC.HsConDeclGADTDetails GHC.GhcPs
+    rmGConDetails (GHC.PrefixConGADT tkn args) = GHC.PrefixConGADT tkn (fmap rmHsScaledType args)
+    rmGConDetails (GHC.RecConGADT tkn rec) = GHC.RecConGADT tkn ((fmap . fmap . fmap) rmConDeclF rec)
+#elif MIN_VERSION_ghc(9,4,0)
     rmGConDetails :: GHC.HsConDeclGADTDetails GHC.GhcPs -> GHC.HsConDeclGADTDetails GHC.GhcPs
     rmGConDetails (GHC.PrefixConGADT args) = GHC.PrefixConGADT (fmap rmHsScaledType args)
     rmGConDetails (GHC.RecConGADT rec tkn) = GHC.RecConGADT ((fmap . fmap . fmap) rmConDeclF rec) tkn
diff --git a/src-ghc/Clash/GHC/NetlistTypes.hs b/src-ghc/Clash/GHC/NetlistTypes.hs
--- a/src-ghc/Clash/GHC/NetlistTypes.hs
+++ b/src-ghc/Clash/GHC/NetlistTypes.hs
@@ -1,7 +1,7 @@
 {-|
   Copyright   :  (C) 2013-2016, University of Twente,
                      2016-2023, Myrtle Software Ltd,
-                     2021-2023, QBayLogic B.V.
+                     2021-2024, QBayLogic B.V.
   License     :  BSD2 (see the file LICENSE)
   Maintainer  :  QBayLogic B.V. <devops@qbaylogic.com>
 -}
@@ -17,6 +17,7 @@
 import Data.Coerce                      (coerce)
 import Data.Functor.Identity            (Identity (..))
 import Data.Text                        (pack)
+import Data.Text.Extra                  (showt)
 import Control.Monad.State.Strict       (State)
 import Control.Monad.Trans.Except
   (Except, ExceptT (..), mapExceptT, runExceptT, throwE)
@@ -41,6 +42,7 @@
 
 import Clash.Annotations.BitRepresentation.Internal
   (CustomReprs)
+import Clash.Signal.Internal (KnownDomain)
 
 ghcTypeToHWType
   :: Int
@@ -149,18 +151,32 @@
         -- XXX: this is a hack to get a KnownDomain from a KnownConfiguration
         "GHC.Classes.(%,%)"
           | [arg0@(tyView -> TyConApp kdNm _), arg1] <- args
-          , nameOcc kdNm == "Clash.Signal.Internal.KnownDomain"
+          , nameOcc kdNm == showt ''KnownDomain
           -> case tyView arg1 of
                 TyConApp kdNm1 _
-                  | nameOcc kdNm1 == "Clash.Signal.Internal.KnownDomain"
+                  | nameOcc kdNm1 == showt ''KnownDomain
                   -> do k1 <- (stripVoid . stripFiltered) <$> ExceptT (MaybeT (go reprs m arg0))
                         k2 <- (stripVoid . stripFiltered) <$> ExceptT (MaybeT (go reprs m arg1))
-                        returnN (Void (Just (Product "(%,%)" Nothing [k1,k2])))
+                        returnN (Void (Just (Product "GHC.Classes.(%,%)" Nothing [k1,k2])))
                   where
                     stripVoid (Void (Just t)) = t
                     stripVoid t = t
                 _ -> ExceptT (MaybeT (go reprs m arg0))
 
+        -- XXX: this is a hack to get a KnownDomain from a KnownConfiguration
+        "GHC.Classes.CTuple2"
+          | [arg0@(tyView -> TyConApp kdNm _), arg1] <- args
+          , nameOcc kdNm == showt ''KnownDomain
+          -> case tyView arg1 of
+                TyConApp kdNm1 _
+                  | nameOcc kdNm1 == showt ''KnownDomain
+                  -> do k1 <- (stripVoid . stripFiltered) <$> ExceptT (MaybeT (go reprs m arg0))
+                        k2 <- (stripVoid . stripFiltered) <$> ExceptT (MaybeT (go reprs m arg1))
+                        returnN (Void (Just (Product "GHC.Classes.CTuple2" Nothing [k1,k2])))
+                  where
+                    stripVoid (Void (Just t)) = t
+                    stripVoid t = t
+                _ -> ExceptT (MaybeT (go reprs m arg0))
 
         "Clash.Signal.Internal.KnownDomain"
           -> case tyConDataCons (UniqMap.find tc m) of
@@ -290,6 +306,7 @@
         -- To ensure that Clash doesn't get stuck working away callstacks that
         -- never end up being used in the generated HDL.
         "GHC.Stack.Types.CallStack" -> returnN (Void Nothing)
+        "GHC.Internal.Stack.Types.CallStack" -> returnN (Void Nothing)
 
         "Clash.Explicit.SimIO.SimIO" | a0:_ <- args ->
           ExceptT $ MaybeT $ Just <$> coreTypeToHWType go reprs m a0
diff --git a/src-ghc/Data/Text/Extra.hs b/src-ghc/Data/Text/Extra.hs
new file mode 100644
--- /dev/null
+++ b/src-ghc/Data/Text/Extra.hs
@@ -0,0 +1,14 @@
+module Data.Text.Extra
+  ( showt
+  , showtl
+  ) where
+
+import Prelude
+import qualified Data.Text as TS
+import qualified Data.Text.Lazy as TL
+
+showt :: (Show a) => a -> TS.Text
+showt = TS.pack . show
+
+showtl :: (Show a) => a -> TL.Text
+showtl = TL.pack . show
