diff --git a/CHANGES.txt b/CHANGES.txt
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,8 @@
 Changelog for Weeder
 
+1.0.6, released 2018-06-16
+    Don't fail with an error if stack setup is necessary
+    If you fail to find stack.yaml give a better error message
 1.0.5, released 2018-05-05
     #39, provide weeder as a library
 1.0.4, released 2018-05-02
diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Weeder [![Hackage version](https://img.shields.io/hackage/v/weeder.svg?label=Hackage)](https://hackage.haskell.org/package/weeder) [![Stackage version](https://www.stackage.org/package/weeder/badge/lts?label=Stackage)](https://www.stackage.org/package/weeder) [![Linux Build Status](https://img.shields.io/travis/ndmitchell/weeder.svg?label=Linux%20build)](https://travis-ci.org/ndmitchell/weeder) [![Windows Build Status](https://img.shields.io/appveyor/ci/ndmitchell/weeder.svg?label=Windows%20build)](https://ci.appveyor.com/project/ndmitchell/weeder)
+# Weeder [![Hackage version](https://img.shields.io/hackage/v/weeder.svg?label=Hackage)](https://hackage.haskell.org/package/weeder) [![Stackage version](https://www.stackage.org/package/weeder/badge/nightly?label=Stackage)](https://www.stackage.org/package/weeder) [![Linux Build Status](https://img.shields.io/travis/ndmitchell/weeder/master.svg?label=Linux%20build)](https://travis-ci.org/ndmitchell/weeder) [![Windows Build Status](https://img.shields.io/appveyor/ci/ndmitchell/weeder/master.svg?label=Windows%20build)](https://ci.appveyor.com/project/ndmitchell/weeder)
 
 Most projects accumulate code over time. Weeder detects unused Haskell exports, allowing dead code to be removed (pulling up the weeds). Weeder piggy-backs off files generated by [`stack`](https://www.haskellstack.org), so first obtain stack, then:
 
diff --git a/src/Stack.hs b/src/Stack.hs
--- a/src/Stack.hs
+++ b/src/Stack.hs
@@ -1,10 +1,11 @@
-{-# LANGUAGE OverloadedStrings, RecordWildCards #-}
+{-# LANGUAGE OverloadedStrings, RecordWildCards, ScopedTypeVariables #-}
 
 module Stack(Stack(..), findStack, parseStack, buildStack) where
 
 import Data.Yaml
 import Data.List.Extra
 import Control.Exception
+import Control.Monad.Extra
 import System.Directory.Extra
 import qualified Data.Text as T
 import qualified Data.HashMap.Strict as Map
@@ -19,9 +20,14 @@
     ,stackDistDir :: FilePath
     }
 
-findStack :: FilePath -> IO String
-findStack dir = withCurrentDirectory dir $
-    fst . line1 <$> cmdStdout "stack" ["path","--config-location","--color=never"]
+findStack :: FilePath -> IO FilePath
+findStack dir = withCurrentDirectory dir $ do
+    let args = ["path","--config-location","--color=never"]
+    -- it may do a stack setup, so there may be lots of garbage and then the actual info at the end
+    res <- maybe "" (trim . snd) . unsnoc . lines <$> cmdStdout "stack" args
+    when (res == "") $
+        fail $ "Failed to find stack.yaml file\nCommand: " ++ unwords ("stack":args)
+    return res
 
 buildStack :: FilePath -> IO ()
 buildStack file = cmd "stack" ["build","--stack-yaml=" ++ file,"--test","--bench","--no-run-tests","--no-run-benchmarks","--color=never"]
diff --git a/src/Util.hs b/src/Util.hs
--- a/src/Util.hs
+++ b/src/Util.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE GeneralizedNewtypeDeriving, OverloadedStrings #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving, OverloadedStrings, TupleSections #-}
 
 module Util(
     Str,
@@ -44,7 +44,7 @@
 parseHanging = repeatedly (\(x:xs) -> first (\a -> (x, unindent a)) $ span (maybe True ((== ' ') . fst) . uncons) xs)
 
 parseHanging2 :: [Str] -> [(Str, [Str])]
-parseHanging2 = repeatedly (\(x:xs) -> first (\a -> (x, a)) $ span (maybe True ((== ' ') . fst) . S.uncons) xs)
+parseHanging2 = repeatedly (\(x:xs) -> first (x,) $ span (maybe True ((== ' ') . fst) . S.uncons) xs)
 
 unindent :: [String] -> [String]
 unindent xs = map (drop n) xs
diff --git a/weeder.cabal b/weeder.cabal
--- a/weeder.cabal
+++ b/weeder.cabal
@@ -1,7 +1,7 @@
 cabal-version:      >= 1.18
 build-type:         Simple
 name:               weeder
-version:            1.0.5
+version:            1.0.6
 license:            BSD3
 license-file:       LICENSE
 category:           Development
@@ -16,7 +16,7 @@
 extra-doc-files:
     README.md
     CHANGES.txt
-tested-with:        GHC==8.4.1, GHC==8.2.2, GHC==8.0.2, GHC==7.10.3
+tested-with:        GHC==8.4.3, GHC==8.2.2, GHC==8.0.2, GHC==7.10.3
 
 source-repository head
     type:     git