ghc-9.12.1: GHC/Parser/Errors/Ppr.hs
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE OverloadedStrings #-}
{-# OPTIONS_GHC -fno-warn-orphans #-} -- instance Diagnostic PsMessage
module GHC.Parser.Errors.Ppr where
import GHC.Prelude
import GHC.Driver.Flags
import GHC.Parser.Errors.Basic
import GHC.Parser.Errors.Types
import GHC.Parser.Types
import GHC.Types.Basic
import GHC.Types.Hint
import GHC.Types.Error
import GHC.Types.Hint.Ppr (perhapsAsPat)
import GHC.Types.SrcLoc
import GHC.Types.Error.Codes
import GHC.Types.Name.Reader ( opIsAt, rdrNameOcc, mkUnqual )
import GHC.Types.Name.Occurrence (isSymOcc, occNameFS, varName)
import GHC.Utils.Outputable
import GHC.Utils.Misc
import GHC.Data.FastString
import GHC.Data.Maybe (catMaybes)
import GHC.Hs.Expr (prependQualified, HsExpr(..), HsLamVariant(..), lamCaseKeyword)
import GHC.Hs.Type (pprLHsContext, pprHsArrow, pprHsForAll)
import GHC.Builtin.Names (allNameStringList)
import GHC.Builtin.Types (filterCTuple)
import qualified GHC.LanguageExtensions as LangExt
import Data.List.NonEmpty (NonEmpty((:|)))
import GHC.Hs.Pat (Pat(..), LPat)
import GHC.Hs.Extension
import GHC.Parser.Annotation (noAnn)
instance Diagnostic PsMessage where
type DiagnosticOpts PsMessage = NoDiagnosticOpts
diagnosticMessage opts = \case
PsUnknownMessage (UnknownDiagnostic f m)
-> diagnosticMessage (f opts) m
PsHeaderMessage m
-> psHeaderMessageDiagnostic m
PsWarnHaddockInvalidPos
-> mkSimpleDecorated $ text "A Haddock comment cannot appear in this position and will be ignored."
PsWarnHaddockIgnoreMulti
-> mkSimpleDecorated $
text "Multiple Haddock comments for a single entity are not allowed." $$
text "The extraneous comment will be ignored."
PsWarnBidirectionalFormatChars ((loc,_,desc) :| xs)
-> mkSimpleDecorated $
text "A unicode bidirectional formatting character" <+> parens (text desc)
$$ text "was found at offset" <+> ppr (bufPos (psBufPos loc)) <+> text "in the file"
$$ (case xs of
[] -> empty
xs -> text "along with further bidirectional formatting characters at" <+> pprChars xs
where
pprChars [] = empty
pprChars ((loc,_,desc):xs) = text "offset" <+> ppr (bufPos (psBufPos loc)) <> text ":" <+> text desc
$$ pprChars xs
)
$$ text "Bidirectional formatting characters may be rendered misleadingly in certain editors"
PsWarnTab tc
-> mkSimpleDecorated $
text "Tab character found here"
<> (if tc == 1
then text ""
else text ", and in" <+> speakNOf (fromIntegral (tc - 1)) (text "further location"))
<> text "."
PsWarnTransitionalLayout reason
-> mkSimpleDecorated $
text "transitional layout will not be accepted in the future:"
$$ (case reason of
TransLayout_Where -> text "`where' clause at the same depth as implicit layout block"
TransLayout_Pipe -> text "`|' at the same depth as implicit layout block"
)
PsWarnOperatorWhitespaceExtConflict sym
-> let mk_prefix_msg extension_name syntax_meaning =
text "The prefix use of a" <+> quotes (pprOperatorWhitespaceSymbol sym)
<+> text "would denote" <+> syntax_meaning
$$ nest 2 (text "were the" <+> extension_name <+> text "extension enabled.")
in mkSimpleDecorated $
case sym of
OperatorWhitespaceSymbol_PrefixPercent -> mk_prefix_msg (text "LinearTypes") (text "a multiplicity annotation")
OperatorWhitespaceSymbol_PrefixDollar -> mk_prefix_msg (text "TemplateHaskell") (text "an untyped splice")
OperatorWhitespaceSymbol_PrefixDollarDollar -> mk_prefix_msg (text "TemplateHaskell") (text "a typed splice")
PsWarnOperatorWhitespace sym occ_type
-> let mk_msg occ_type_str =
text "The" <+> text occ_type_str <+> text "use of a" <+> quotes (ftext sym)
<+> text "might be repurposed as special syntax"
$$ nest 2 (text "by a future language extension.")
in mkSimpleDecorated $
case occ_type of
OperatorWhitespaceOccurrence_Prefix -> mk_msg "prefix"
OperatorWhitespaceOccurrence_Suffix -> mk_msg "suffix"
OperatorWhitespaceOccurrence_TightInfix -> mk_msg "tight infix"
PsWarnStarBinder
-> mkSimpleDecorated $
text "Found binding occurrence of" <+> quotes (text "*")
<+> text "yet StarIsType is enabled."
PsWarnStarIsType
-> mkSimpleDecorated $
text "Using" <+> quotes (text "*")
<+> text "(or its Unicode variant) to mean"
<+> quotes (text "Data.Kind.Type")
$$ text "relies on the StarIsType extension, which will become"
$$ text "deprecated in the future."
PsWarnUnrecognisedPragma prag _
-> mkSimpleDecorated $ text "Unrecognised pragma"
<> if null prag then empty else text ":" <+> text prag
PsWarnMisplacedPragma prag
-> mkSimpleDecorated $ text "Misplaced" <+> pprFileHeaderPragmaType prag <+> text "pragma"
PsWarnImportPreQualified
-> mkSimpleDecorated $
text "Found" <+> quotes (text "qualified")
<+> text "in prepositive position"
PsWarnViewPatternSignatures old new
-> mkDecorated $
[ text "Found an unparenthesized pattern signature on the RHS of a view pattern."
, vcat [ text "This code might stop working in a future GHC release"
, text "due to a planned change to the precedence of view patterns,"
, text "unless the view function is an endofunction." ]
, nest 2 $
vcat [ text "Current parse:" <+> quotes (ppr (add_parens_sig old))
, text "Future parse:" <+> quotes (ppr (add_parens_view new)) ]
]
where
add_parens_sig :: LPat GhcPs -> LPat GhcPs
add_parens_sig = go
where go (L l (ViewPat x e p)) = L l (ViewPat x e (go p))
go (L l (SigPat x p sig)) = par_pat (L l (SigPat x p sig))
go p = p
add_parens_view :: LPat GhcPs -> LPat GhcPs
add_parens_view = go
where go (L l (ViewPat x e p)) = par_pat (L l (ViewPat x e p))
go (L l (SigPat x p sig)) = L l (SigPat x (go p) sig)
go p = p
par_pat :: LPat GhcPs -> LPat GhcPs
par_pat p = L noAnn (ParPat noAnn p)
PsErrLexer err kind
-> mkSimpleDecorated $ hcat
[ case err of
LexError -> text "lexical error"
LexUnknownPragma -> text "unknown pragma"
LexErrorInPragma -> text "lexical error in pragma"
LexNumEscapeRange -> text "numeric escape sequence out of range"
LexUnterminatedComment -> text "unterminated `{-'"
LexUnterminatedOptions -> text "unterminated OPTIONS pragma"
LexUnterminatedQQ -> text "unterminated quasiquotation"
, case kind of
LexErrKind_EOF -> text " at end of input"
LexErrKind_UTF8 -> text " (UTF-8 decoding error)"
LexErrKind_Char c -> text $ " at character " ++ show c
]
PsErrParse token _details
| null token
-> mkSimpleDecorated $ text "parse error (possibly incorrect indentation or mismatched brackets)"
| otherwise
-> mkSimpleDecorated $ text "parse error on input" <+> quotes (text token)
PsErrCmmLexer
-> mkSimpleDecorated $ text "Cmm lexical error"
PsErrCmmParser cmm_err -> mkSimpleDecorated $ case cmm_err of
CmmUnknownPrimitive name -> text "unknown primitive" <+> ftext name
CmmUnknownMacro fun -> text "unknown macro" <+> ftext fun
CmmUnknownCConv cconv -> text "unknown calling convention:" <+> text cconv
CmmUnrecognisedSafety safety -> text "unrecognised safety" <+> text safety
CmmUnrecognisedHint hint -> text "unrecognised hint:" <+> text hint
PsErrTypeAppWithoutSpace v e
-> mkSimpleDecorated $
sep [ text "@-pattern in expression context:"
, nest 4 (pprPrefixOcc v <> text "@" <> ppr e)
]
$$ text "Type application syntax requires a space before '@'"
PsErrLazyPatWithoutSpace e
-> mkSimpleDecorated $
sep [ text "Lazy pattern in expression context:"
, nest 4 (text "~" <> ppr e)
]
$$ text "Did you mean to add a space after the '~'?"
PsErrBangPatWithoutSpace e
-> mkSimpleDecorated $
sep [ text "Bang pattern in expression context:"
, nest 4 (text "!" <> ppr e)
]
$$ text "Did you mean to add a space after the '!'?"
PsErrInvalidInfixHole
-> mkSimpleDecorated $ text "Invalid infix hole, expected an infix operator"
PsErrExpectedHyphen
-> mkSimpleDecorated $ text "Expected a hyphen"
PsErrSpaceInSCC
-> mkSimpleDecorated $ text "Spaces are not allowed in SCCs"
PsErrEmptyDoubleQuotes _th_on
-> mkSimpleDecorated $ vcat msg
where
msg = [ text "Parser error on `''`"
, text "Character literals may not be empty"
]
PsErrLambdaCase
-- we can't get this error for \cases, since without -XLambdaCase, that's
-- just a regular lambda expression
-> mkSimpleDecorated $ text "Illegal" <+> lamCaseKeyword LamCase
PsErrEmptyLambda
-> mkSimpleDecorated $ text "A lambda requires at least one parameter"
PsErrLinearFunction
-> mkSimpleDecorated $ text "Illegal use of linear functions"
PsErrOverloadedRecordUpdateNotEnabled
-> mkSimpleDecorated $ text "Illegal overloaded record update"
PsErrMultiWayIf
-> mkSimpleDecorated $ text "Illegal multi-way if-expression"
PsErrNumUnderscores reason
-> mkSimpleDecorated $
text $ case reason of
NumUnderscore_Integral -> "Illegal underscores in integer literals"
NumUnderscore_Float -> "Illegal underscores in floating literals"
PsErrIllegalBangPattern e
-> mkSimpleDecorated $ text "Illegal bang-pattern or strict binding" $$ ppr e
PsErrOverloadedRecordDotInvalid
-> mkSimpleDecorated $
text "Use of OverloadedRecordDot '.' not valid ('.' isn't allowed when constructing records or in record patterns)"
PsErrIllegalPatSynExport
-> mkSimpleDecorated $ text "Illegal export form"
PsErrOverloadedRecordUpdateNoQualifiedFields
-> mkSimpleDecorated $ text "Fields cannot be qualified when OverloadedRecordUpdate is enabled"
PsErrExplicitForall is_unicode
-> mkSimpleDecorated $ text "Illegal symbol" <+> quotes (forallSym is_unicode) <+> text "in type"
PsErrIllegalQualifiedDo qdoDoc
-> mkSimpleDecorated $
text "Illegal qualified" <+> quotes qdoDoc <+> text "block"
PsErrQualifiedDoInCmd m
-> mkSimpleDecorated $
hang (text "Parse error in command:") 2 $
text "Found a qualified" <+> ppr m <> text ".do block in a command, but"
$$ text "qualified 'do' is not supported in commands."
PsErrRecordSyntaxInPatSynDecl pat
-> mkSimpleDecorated $
text "record syntax not supported for pattern synonym declarations:"
$$ ppr pat
PsErrEmptyWhereInPatSynDecl patsyn_name
-> mkSimpleDecorated $
text "pattern synonym 'where' clause cannot be empty"
$$ text "In the pattern synonym declaration for: "
<+> ppr (patsyn_name)
PsErrInvalidWhereBindInPatSynDecl patsyn_name decl
-> mkSimpleDecorated $
text "pattern synonym 'where' clause must bind the pattern synonym's name"
<+> quotes (ppr patsyn_name) $$ ppr decl
PsErrNoSingleWhereBindInPatSynDecl _patsyn_name decl
-> mkSimpleDecorated $
text "pattern synonym 'where' clause must contain a single binding:"
$$ ppr decl
PsErrDeclSpliceNotAtTopLevel d
-> mkSimpleDecorated $
hang (text "Declaration splices are allowed only"
<+> text "at the top level:")
2 (ppr d)
PsErrMultipleNamesInStandaloneKindSignature vs
-> mkSimpleDecorated $
vcat [ hang (text "Standalone kind signatures do not support multiple names at the moment:")
2 (pprWithCommas ppr vs)
, text "See https://gitlab.haskell.org/ghc/ghc/issues/16754 for details."
]
PsErrIllegalExplicitNamespace
-> mkSimpleDecorated $
text "Illegal keyword 'type'"
PsErrUnallowedPragma prag
-> mkSimpleDecorated $
hang (text "A pragma is not allowed in this position:") 2
(ppr prag)
PsErrImportPostQualified
-> mkSimpleDecorated $
text "Found" <+> quotes (text "qualified")
<+> text "in postpositive position. "
PsErrImportQualifiedTwice
-> mkSimpleDecorated $ text "Multiple occurrences of 'qualified'"
PsErrIllegalImportBundleForm
-> mkSimpleDecorated $
text "Illegal import form, this syntax can only be used to bundle"
$+$ text "pattern synonyms with types in module exports."
PsErrInvalidRuleActivationMarker
-> mkSimpleDecorated $ text "Invalid rule activation marker"
PsErrMissingBlock
-> mkSimpleDecorated $ text "Missing block"
PsErrUnsupportedBoxedSumExpr s
-> mkSimpleDecorated $
hang (text "Boxed sums not supported:") 2
(pprSumOrTuple Boxed s)
PsErrUnsupportedBoxedSumPat s
-> mkSimpleDecorated $
hang (text "Boxed sums not supported:") 2
(pprSumOrTuple Boxed s)
PsErrUnexpectedQualifiedConstructor v
-> mkSimpleDecorated $
hang (text "Expected an unqualified type constructor:") 2
(ppr v)
PsErrTupleSectionInPat
-> mkSimpleDecorated $ text "Tuple section in pattern context"
PsErrOpFewArgs _ op
-> mkSimpleDecorated $
text "Operator applied to too few arguments:" <+> ppr op
PsErrVarForTyCon name
-> mkSimpleDecorated $
text "Expecting a type constructor but found a variable,"
<+> quotes (ppr name) <> text "."
$$ if isSymOcc $ rdrNameOcc name
then text "If" <+> quotes (ppr name) <+> text "is a type constructor"
<+> text "then enable ExplicitNamespaces and use the 'type' keyword."
else empty
PsErrMalformedEntityString
-> mkSimpleDecorated $ text "Malformed entity string"
PsErrDotsInRecordUpdate
-> mkSimpleDecorated $ text "You cannot use `..' in a record update"
PsErrInvalidDataCon t
-> mkSimpleDecorated $
hang (text "Cannot parse data constructor in a data/newtype declaration:") 2
(ppr t)
PsErrInvalidInfixDataCon lhs tc rhs
-> mkSimpleDecorated $
hang (text "Cannot parse an infix data constructor in a data/newtype declaration:") 2
(ppr lhs <+> ppr tc <+> ppr rhs)
PsErrIllegalPromotionQuoteDataCon name
-> mkSimpleDecorated $
text "Illegal promotion quote mark in the declaration of" $$
text "data/newtype constructor" <+> pprPrefixOcc name
PsErrUnpackDataCon
-> mkSimpleDecorated $ text "{-# UNPACK #-} cannot be applied to a data constructor."
PsErrUnexpectedKindAppInDataCon lhs ki
-> mkSimpleDecorated $
hang (text "Unexpected kind application in a data/newtype declaration:") 2
(ppr lhs <+> text "@" <> ppr ki)
PsErrInvalidRecordCon p
-> mkSimpleDecorated $ text "Not a record constructor:" <+> ppr p
PsErrIllegalUnboxedStringInPat lit
-> mkSimpleDecorated $ text "Illegal unboxed string literal in pattern:" $$ ppr lit
PsErrIllegalUnboxedFloatingLitInPat lit
-> mkSimpleDecorated $ text "Illegal unboxed floating point literal in pattern:" $$ ppr lit
PsErrDoNotationInPat
-> mkSimpleDecorated $ text "do-notation in pattern"
PsErrIfThenElseInPat
-> mkSimpleDecorated $ text "(if ... then ... else ...)-syntax in pattern"
PsErrCaseInPat
-> mkSimpleDecorated $ text "(case ... of ...)-syntax in pattern"
PsErrLetInPat
-> mkSimpleDecorated $ text "(let ... in ...)-syntax in pattern"
PsErrLambdaInPat lam_variant
-> mkSimpleDecorated $ text "Illegal" <+> lamCaseKeyword lam_variant <> text "-syntax in pattern"
PsErrArrowExprInPat e
-> mkSimpleDecorated $ text "Expression syntax in pattern:" <+> ppr e
PsErrArrowCmdInPat c
-> mkSimpleDecorated $ text "Command syntax in pattern:" <+> ppr c
PsErrArrowCmdInExpr c
-> mkSimpleDecorated $
vcat
[ text "Arrow command found where an expression was expected:"
, nest 2 (ppr c)
]
PsErrOrPatInExpr p
-> mkSimpleDecorated $
sep [ text "Or pattern in expression context:"
, nest 4 (ppr p)
]
PsErrCaseCmdInFunAppCmd a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "case command") a
PsErrLambdaCmdInFunAppCmd lam_variant a
-> mkSimpleDecorated $
pp_unexpected_fun_app (lamCaseKeyword lam_variant <+> text "command") a
PsErrIfCmdInFunAppCmd a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "if command") a
PsErrLetCmdInFunAppCmd a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "let command") a
PsErrDoCmdInFunAppCmd a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "do command") a
PsErrDoInFunAppExpr m a
-> mkSimpleDecorated $ pp_unexpected_fun_app (prependQualified m (text "do block")) a
PsErrMDoInFunAppExpr m a
-> mkSimpleDecorated $ pp_unexpected_fun_app (prependQualified m (text "mdo block")) a
PsErrCaseInFunAppExpr a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "case expression") a
PsErrLambdaInFunAppExpr lam_variant a
-> mkSimpleDecorated $ pp_unexpected_fun_app (lamCaseKeyword lam_variant <+> text "expression") a
PsErrLetInFunAppExpr a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "let expression") a
PsErrIfInFunAppExpr a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "if expression") a
PsErrProcInFunAppExpr a
-> mkSimpleDecorated $ pp_unexpected_fun_app (text "proc expression") a
PsErrMalformedTyOrClDecl ty
-> mkSimpleDecorated $
text "Malformed head of type or class declaration:" <+> ppr ty
PsErrIllegalWhereInDataDecl
-> mkSimpleDecorated $ text "Illegal keyword 'where' in data declaration"
PsErrIllegalDataTypeContext c
-> mkSimpleDecorated $
text "Illegal datatype context:"
<+> pprLHsContext (Just c)
PsErrPrimStringInvalidChar
-> mkSimpleDecorated $ text "primitive string literal must contain only characters <= \'\\xFF\'"
PsErrSuffixAT
-> mkSimpleDecorated $
text "The symbol '@' occurs as a suffix." $$
text "For an as-pattern, there must not be any whitespace surrounding '@'."
PsErrPrecedenceOutOfRange i
-> mkSimpleDecorated $ text "Precedence out of range: " <> int i
PsErrSemiColonsInCondExpr c st t se e
-> mkSimpleDecorated $
text "Unexpected semi-colons in conditional:"
$$ nest 4 expr
where
pprOptSemi True = semi
pprOptSemi False = empty
expr = text "if" <+> ppr c <> pprOptSemi st <+>
text "then" <+> ppr t <> pprOptSemi se <+>
text "else" <+> ppr e
PsErrSemiColonsInCondCmd c st t se e
-> mkSimpleDecorated $
text "Unexpected semi-colons in conditional:"
$$ nest 4 expr
where
pprOptSemi True = semi
pprOptSemi False = empty
expr = text "if" <+> ppr c <> pprOptSemi st <+>
text "then" <+> ppr t <> pprOptSemi se <+>
text "else" <+> ppr e
PsErrAtInPatPos
-> mkSimpleDecorated $
text "Found a binding for the"
<+> quotes (text "@")
<+> text "operator in a pattern position."
$$ perhapsAsPat
PsErrParseErrorOnInput occ
-> mkSimpleDecorated $ text "parse error on input" <+> ftext (occNameFS occ)
PsErrMalformedDecl what for
-> mkSimpleDecorated $
text "Malformed" <+> what
<+> text "declaration for" <+> quotes (ppr for)
PsErrNotADataCon name
-> mkSimpleDecorated $ text "Not a data constructor:" <+> quotes (ppr name)
PsErrInferredTypeVarNotAllowed
-> mkSimpleDecorated $ text "Inferred type variables are not allowed here"
PsErrIllegalTraditionalRecordSyntax s
-> mkSimpleDecorated $
text "Illegal record syntax:" <+> s
PsErrParseErrorInCmd s
-> mkSimpleDecorated $ hang (text "Parse error in command:") 2 s
PsErrInPat s details
-> let msg = parse_error_in_pat
body = case details of
PEIP_NegApp -> text "-" <> ppr s
PEIP_TypeArgs peipd_tyargs
| not (null peipd_tyargs) -> ppr s <+> vcat [
hsep (map ppr peipd_tyargs)
, text "Type applications in patterns are only allowed on data constructors."
]
| otherwise -> ppr s
PEIP_OtherPatDetails (ParseContext (Just fun) _)
-> ppr s <+> text "In a function binding for the"
<+> quotes (ppr fun)
<+> text "operator."
$$ if opIsAt fun
then perhapsAsPat
else empty
_ -> ppr s
in mkSimpleDecorated $ msg <+> body
PsErrParseRightOpSectionInPat infixOcc s
-> mkSimpleDecorated $ parse_error_in_pat <+> pprInfixOcc infixOcc <> ppr s
PsErrIllegalRoleName role _nearby
-> mkSimpleDecorated $
text "Illegal role name" <+> quotes (ppr role)
PsErrInvalidTypeSignature reason lhs
-> mkSimpleDecorated $ case reason of
PsErrInvalidTypeSig_DataCon -> text "Invalid data constructor" <+> quotes (ppr lhs) <+>
text "in type signature" <> colon $$
text "You can only define data constructors in data type declarations."
PsErrInvalidTypeSig_Qualified -> text "Invalid qualified name in type signature."
PsErrInvalidTypeSig_Other -> text "Invalid type signature" <> colon $$
text "A type signature should be of form" <+>
placeHolder "variables" <+> dcolon <+> placeHolder "type" <>
dot
where placeHolder = angleBrackets . text
PsErrUnexpectedTypeInDecl t what tc tparms equals_or_where
-> mkSimpleDecorated $
vcat [ text "Unexpected type" <+> quotes (ppr t)
, text "In the" <+> what
<+> text "declaration for" <+> quotes tc'
, vcat[ (text "A" <+> what
<+> text "declaration should have form")
, nest 2
(what
<+> tc'
<+> hsep (map text (takeList tparms allNameStringList))
<+> equals_or_where) ] ]
where
-- Avoid printing a constraint tuple in the error message. Print
-- a plain old tuple instead (since that's what the user probably
-- wrote). See #14907
tc' = ppr $ filterCTuple tc
PsErrInvalidPackageName pkg
-> mkSimpleDecorated $ vcat
[ text "Parse error" <> colon <+> quotes (ftext pkg)
, text "Version number or non-alphanumeric" <+>
text "character in package name"
]
PsErrIllegalGadtRecordMultiplicity arr
-> mkSimpleDecorated $ vcat
[ text "Parse error" <> colon <+> quotes (ppr arr)
, text "Record constructors in GADTs must use an ordinary, non-linear arrow."
]
PsErrInvalidCApiImport {} -> mkSimpleDecorated $ vcat [ text "Wrapper stubs can't be used with CApiFFI."]
PsErrMultipleConForNewtype tycon n -> mkSimpleDecorated $ vcat
[ sep
[ text "A newtype must have exactly one constructor,"
, nest 2 $ text "but" <+> quotes (ppr tycon) <+> text "has" <+> speakN n ]
, text "In the newtype declaration for" <+> quotes (ppr tycon) ]
PsErrUnicodeCharLooksLike bad_char looks_like_char looks_like_char_name
-> mkSimpleDecorated $
hsep [ text "Unicode character"
-- purposefully not using `quotes (text [bad_char])`, because the quotes function adds smart quotes,
-- and smart quotes may be the topic of this error message
, text "'" <> text [bad_char] <> text "' (" <> text (show bad_char) <> text ")"
, text "looks like"
, text "'" <> text [looks_like_char] <> text "' (" <> text looks_like_char_name <> text ")" <> comma
, text "but it is not" ]
PsErrInvalidPun PEP_QuoteDisambiguation
-> mkSimpleDecorated $ vcat
[ text "Disambiguating data constructors of tuples and lists is disabled."
, text "Remove the quote to use the data constructor."
]
PsErrInvalidPun PEP_TupleSyntaxType
-> mkSimpleDecorated $ vcat
[ text "Unboxed tuple data constructors are not supported in types."
, text "Use" <+> quotes (text "Tuple<n># a b c ...") <+> text "to refer to the type constructor."
]
PsErrInvalidPun PEP_SumSyntaxType
-> mkSimpleDecorated $ vcat
[ text "Unboxed sum data constructors are not supported in types."
, text "Use" <+> quotes (text "Sum<n># a b c ...") <+> text "to refer to the type constructor."
]
PsErrTypeSyntaxInPat ctx
-> mkSimpleDecorated $ vcat
[ text "Illegal" <+> text what <+> "in pattern:" <+> quotes ctx'
, text "Type syntax in patterns isn't supported at the time"]
where
(what, ctx') = case ctx of
PETS_FunctionArrow arg arr res -> ("function arrow", ppr arg <+> pprHsArrow arr <+> ppr res)
PETS_Multiplicity tok p -> ("multiplicity annotation", ppr tok <> ppr p)
PETS_ForallTelescope tele body -> ("forall telescope", pprHsForAll tele Nothing <+> ppr body)
PETS_ConstraintContext ctx -> ("constraint context", ppr ctx)
PsErrIllegalOrPat pat
-> mkSimpleDecorated $ vcat [text "Illegal or-pattern:" <+> ppr (unLoc pat)]
diagnosticReason = \case
PsUnknownMessage m -> diagnosticReason m
PsHeaderMessage m -> psHeaderMessageReason m
PsWarnBidirectionalFormatChars{} -> WarningWithFlag Opt_WarnUnicodeBidirectionalFormatCharacters
PsWarnTab{} -> WarningWithFlag Opt_WarnTabs
PsWarnTransitionalLayout{} -> WarningWithFlag Opt_WarnAlternativeLayoutRuleTransitional
PsWarnOperatorWhitespaceExtConflict{} -> WarningWithFlag Opt_WarnOperatorWhitespaceExtConflict
PsWarnOperatorWhitespace{} -> WarningWithFlag Opt_WarnOperatorWhitespace
PsWarnHaddockInvalidPos -> WarningWithFlag Opt_WarnInvalidHaddock
PsWarnHaddockIgnoreMulti -> WarningWithFlag Opt_WarnInvalidHaddock
PsWarnStarBinder -> WarningWithFlag Opt_WarnStarBinder
PsWarnStarIsType -> WarningWithFlag Opt_WarnStarIsType
PsWarnUnrecognisedPragma{} -> WarningWithFlag Opt_WarnUnrecognisedPragmas
PsWarnMisplacedPragma{} -> WarningWithFlag Opt_WarnMisplacedPragmas
PsWarnImportPreQualified -> WarningWithFlag Opt_WarnPrepositiveQualifiedModule
PsWarnViewPatternSignatures{} -> WarningWithFlag Opt_WarnViewPatternSignatures
PsErrLexer{} -> ErrorWithoutFlag
PsErrCmmLexer -> ErrorWithoutFlag
PsErrCmmParser{} -> ErrorWithoutFlag
PsErrParse{} -> ErrorWithoutFlag
PsErrTypeAppWithoutSpace{} -> ErrorWithoutFlag
PsErrLazyPatWithoutSpace{} -> ErrorWithoutFlag
PsErrBangPatWithoutSpace{} -> ErrorWithoutFlag
PsErrInvalidInfixHole -> ErrorWithoutFlag
PsErrExpectedHyphen -> ErrorWithoutFlag
PsErrSpaceInSCC -> ErrorWithoutFlag
PsErrEmptyDoubleQuotes{} -> ErrorWithoutFlag
PsErrLambdaCase{} -> ErrorWithoutFlag
PsErrEmptyLambda{} -> ErrorWithoutFlag
PsErrLinearFunction{} -> ErrorWithoutFlag
PsErrMultiWayIf{} -> ErrorWithoutFlag
PsErrOverloadedRecordUpdateNotEnabled{} -> ErrorWithoutFlag
PsErrNumUnderscores{} -> ErrorWithoutFlag
PsErrIllegalBangPattern{} -> ErrorWithoutFlag
PsErrOverloadedRecordDotInvalid{} -> ErrorWithoutFlag
PsErrIllegalPatSynExport -> ErrorWithoutFlag
PsErrOverloadedRecordUpdateNoQualifiedFields -> ErrorWithoutFlag
PsErrExplicitForall{} -> ErrorWithoutFlag
PsErrIllegalQualifiedDo{} -> ErrorWithoutFlag
PsErrQualifiedDoInCmd{} -> ErrorWithoutFlag
PsErrRecordSyntaxInPatSynDecl{} -> ErrorWithoutFlag
PsErrEmptyWhereInPatSynDecl{} -> ErrorWithoutFlag
PsErrInvalidWhereBindInPatSynDecl{} -> ErrorWithoutFlag
PsErrNoSingleWhereBindInPatSynDecl{} -> ErrorWithoutFlag
PsErrDeclSpliceNotAtTopLevel{} -> ErrorWithoutFlag
PsErrMultipleNamesInStandaloneKindSignature{} -> ErrorWithoutFlag
PsErrIllegalExplicitNamespace -> ErrorWithoutFlag
PsErrUnallowedPragma{} -> ErrorWithoutFlag
PsErrImportPostQualified -> ErrorWithoutFlag
PsErrImportQualifiedTwice -> ErrorWithoutFlag
PsErrIllegalImportBundleForm -> ErrorWithoutFlag
PsErrInvalidRuleActivationMarker -> ErrorWithoutFlag
PsErrMissingBlock -> ErrorWithoutFlag
PsErrUnsupportedBoxedSumExpr{} -> ErrorWithoutFlag
PsErrUnsupportedBoxedSumPat{} -> ErrorWithoutFlag
PsErrUnexpectedQualifiedConstructor{} -> ErrorWithoutFlag
PsErrTupleSectionInPat{} -> ErrorWithoutFlag
PsErrOpFewArgs{} -> ErrorWithoutFlag
PsErrVarForTyCon{} -> ErrorWithoutFlag
PsErrMalformedEntityString -> ErrorWithoutFlag
PsErrDotsInRecordUpdate -> ErrorWithoutFlag
PsErrInvalidDataCon{} -> ErrorWithoutFlag
PsErrInvalidInfixDataCon{} -> ErrorWithoutFlag
PsErrIllegalPromotionQuoteDataCon{} -> ErrorWithoutFlag
PsErrUnpackDataCon -> ErrorWithoutFlag
PsErrUnexpectedKindAppInDataCon{} -> ErrorWithoutFlag
PsErrInvalidRecordCon{} -> ErrorWithoutFlag
PsErrIllegalUnboxedStringInPat{} -> ErrorWithoutFlag
PsErrIllegalUnboxedFloatingLitInPat{} -> ErrorWithoutFlag
PsErrDoNotationInPat{} -> ErrorWithoutFlag
PsErrIfThenElseInPat -> ErrorWithoutFlag
PsErrCaseInPat -> ErrorWithoutFlag
PsErrLetInPat -> ErrorWithoutFlag
PsErrLambdaInPat{} -> ErrorWithoutFlag
PsErrArrowExprInPat{} -> ErrorWithoutFlag
PsErrArrowCmdInPat{} -> ErrorWithoutFlag
PsErrArrowCmdInExpr{} -> ErrorWithoutFlag
PsErrOrPatInExpr{} -> ErrorWithoutFlag
PsErrCaseCmdInFunAppCmd{} -> ErrorWithoutFlag
PsErrLambdaCmdInFunAppCmd{} -> ErrorWithoutFlag
PsErrIfCmdInFunAppCmd{} -> ErrorWithoutFlag
PsErrLetCmdInFunAppCmd{} -> ErrorWithoutFlag
PsErrDoCmdInFunAppCmd{} -> ErrorWithoutFlag
PsErrDoInFunAppExpr{} -> ErrorWithoutFlag
PsErrMDoInFunAppExpr{} -> ErrorWithoutFlag
PsErrLambdaInFunAppExpr{} -> ErrorWithoutFlag
PsErrCaseInFunAppExpr{} -> ErrorWithoutFlag
PsErrLetInFunAppExpr{} -> ErrorWithoutFlag
PsErrIfInFunAppExpr{} -> ErrorWithoutFlag
PsErrProcInFunAppExpr{} -> ErrorWithoutFlag
PsErrMalformedTyOrClDecl{} -> ErrorWithoutFlag
PsErrIllegalWhereInDataDecl -> ErrorWithoutFlag
PsErrIllegalDataTypeContext{} -> ErrorWithoutFlag
PsErrPrimStringInvalidChar -> ErrorWithoutFlag
PsErrSuffixAT -> ErrorWithoutFlag
PsErrPrecedenceOutOfRange{} -> ErrorWithoutFlag
PsErrSemiColonsInCondExpr{} -> ErrorWithoutFlag
PsErrSemiColonsInCondCmd{} -> ErrorWithoutFlag
PsErrAtInPatPos -> ErrorWithoutFlag
PsErrParseErrorOnInput{} -> ErrorWithoutFlag
PsErrMalformedDecl{} -> ErrorWithoutFlag
PsErrNotADataCon{} -> ErrorWithoutFlag
PsErrInferredTypeVarNotAllowed -> ErrorWithoutFlag
PsErrIllegalTraditionalRecordSyntax{} -> ErrorWithoutFlag
PsErrParseErrorInCmd{} -> ErrorWithoutFlag
PsErrInPat{} -> ErrorWithoutFlag
PsErrIllegalRoleName{} -> ErrorWithoutFlag
PsErrInvalidTypeSignature{} -> ErrorWithoutFlag
PsErrUnexpectedTypeInDecl{} -> ErrorWithoutFlag
PsErrInvalidPackageName{} -> ErrorWithoutFlag
PsErrParseRightOpSectionInPat{} -> ErrorWithoutFlag
PsErrIllegalGadtRecordMultiplicity{} -> ErrorWithoutFlag
PsErrInvalidCApiImport {} -> ErrorWithoutFlag
PsErrMultipleConForNewtype {} -> ErrorWithoutFlag
PsErrUnicodeCharLooksLike{} -> ErrorWithoutFlag
PsErrInvalidPun {} -> ErrorWithoutFlag
PsErrIllegalOrPat{} -> ErrorWithoutFlag
PsErrTypeSyntaxInPat{} -> ErrorWithoutFlag
diagnosticHints = \case
PsUnknownMessage m -> diagnosticHints m
PsHeaderMessage m -> psHeaderMessageHints m
PsWarnBidirectionalFormatChars{} -> noHints
PsWarnTab{} -> [SuggestUseSpaces]
PsWarnTransitionalLayout{} -> noHints
PsWarnOperatorWhitespaceExtConflict sym -> [SuggestUseWhitespaceAfter sym]
PsWarnOperatorWhitespace sym occ -> [SuggestUseWhitespaceAround (unpackFS sym) occ]
PsWarnHaddockInvalidPos -> noHints
PsWarnHaddockIgnoreMulti -> noHints
PsWarnStarBinder -> [SuggestQualifyStarOperator]
PsWarnStarIsType -> [SuggestUseTypeFromDataKind Nothing]
PsWarnUnrecognisedPragma "" _ -> noHints
PsWarnUnrecognisedPragma p avail ->
let suggestions = fuzzyMatch p avail
in if null suggestions
then noHints
else [SuggestCorrectPragmaName suggestions]
PsWarnMisplacedPragma{} -> [SuggestPlacePragmaInHeader]
PsWarnImportPreQualified -> [ SuggestQualifiedAfterModuleName
, suggestExtension LangExt.ImportQualifiedPost]
PsWarnViewPatternSignatures{} -> [SuggestParenthesizePatternRHS]
PsErrLexer{} -> noHints
PsErrCmmLexer -> noHints
PsErrCmmParser{} -> noHints
PsErrParse token PsErrParseDetails{..} -> case token of
"" -> []
"$" | not ped_th_enabled -> [suggestExtension LangExt.TemplateHaskell] -- #7396
"$$" | not ped_th_enabled -> [suggestExtension LangExt.TemplateHaskell] -- #20157
"<-" | ped_mdo_in_last_100 -> [suggestExtension LangExt.RecursiveDo]
| otherwise -> [SuggestMissingDo]
"=" | ped_do_in_last_100 -> [SuggestLetInDo] -- #15849
_ | not ped_pat_syn_enabled
, ped_pattern_parsed -> [suggestExtension LangExt.PatternSynonyms] -- #12429
| otherwise -> []
PsErrTypeAppWithoutSpace{} -> noHints
PsErrLazyPatWithoutSpace{} -> noHints
PsErrBangPatWithoutSpace{} -> noHints
PsErrInvalidInfixHole -> noHints
PsErrExpectedHyphen -> noHints
PsErrSpaceInSCC -> noHints
PsErrEmptyDoubleQuotes th_on | th_on -> [SuggestThQuotationSyntax]
| otherwise -> noHints
PsErrLambdaCase{} -> [suggestExtension LangExt.LambdaCase]
PsErrEmptyLambda{} -> noHints
PsErrLinearFunction{} -> [suggestExtension LangExt.LinearTypes]
PsErrMultiWayIf{} -> [suggestExtension LangExt.MultiWayIf]
PsErrOverloadedRecordUpdateNotEnabled{} -> [suggestExtension LangExt.OverloadedRecordUpdate]
PsErrNumUnderscores{} -> [suggestExtension LangExt.NumericUnderscores]
PsErrIllegalBangPattern{} -> [suggestExtension LangExt.BangPatterns]
PsErrOverloadedRecordDotInvalid{} -> noHints
PsErrIllegalPatSynExport -> [suggestExtension LangExt.PatternSynonyms]
PsErrOverloadedRecordUpdateNoQualifiedFields -> noHints
PsErrExplicitForall is_unicode -> [useExtensionInOrderTo info LangExt.ExplicitForAll]
where info = "to enable syntax:" <+> forallSym is_unicode <+> angleBrackets "tvs" <> dot <+> angleBrackets "type"
PsErrIllegalQualifiedDo{} -> [suggestExtension LangExt.QualifiedDo]
PsErrQualifiedDoInCmd{} -> noHints
PsErrRecordSyntaxInPatSynDecl{} -> noHints
PsErrEmptyWhereInPatSynDecl{} -> noHints
PsErrInvalidWhereBindInPatSynDecl{} -> noHints
PsErrNoSingleWhereBindInPatSynDecl{} -> noHints
PsErrDeclSpliceNotAtTopLevel{} -> noHints
PsErrMultipleNamesInStandaloneKindSignature{} -> noHints
PsErrIllegalExplicitNamespace -> [suggestExtension LangExt.ExplicitNamespaces]
PsErrUnallowedPragma{} -> noHints
PsErrImportPostQualified -> [suggestExtension LangExt.ImportQualifiedPost]
PsErrImportQualifiedTwice -> noHints
PsErrIllegalImportBundleForm -> noHints
PsErrInvalidRuleActivationMarker -> noHints
PsErrMissingBlock -> noHints
PsErrUnsupportedBoxedSumExpr{} -> noHints
PsErrUnsupportedBoxedSumPat{} -> noHints
PsErrUnexpectedQualifiedConstructor{} -> noHints
PsErrTupleSectionInPat{} -> noHints
PsErrOpFewArgs star_is_type op
-> noStarIsTypeHints star_is_type op
PsErrVarForTyCon{} -> noHints
PsErrMalformedEntityString -> noHints
PsErrDotsInRecordUpdate -> noHints
PsErrInvalidDataCon{} -> noHints
PsErrInvalidInfixDataCon{} -> noHints
PsErrIllegalPromotionQuoteDataCon{} -> noHints
PsErrUnpackDataCon -> noHints
PsErrUnexpectedKindAppInDataCon{} -> noHints
PsErrInvalidRecordCon{} -> noHints
PsErrIllegalUnboxedStringInPat{} -> noHints
PsErrIllegalUnboxedFloatingLitInPat{} -> noHints
PsErrDoNotationInPat{} -> noHints
PsErrIfThenElseInPat -> noHints
PsErrCaseInPat -> noHints
PsErrLetInPat -> noHints
PsErrLambdaInPat{} -> noHints
PsErrArrowExprInPat{} -> noHints
PsErrArrowCmdInPat{} -> noHints
PsErrArrowCmdInExpr{} -> noHints
PsErrOrPatInExpr{} -> noHints
PsErrLambdaCmdInFunAppCmd{} -> suggestParensAndBlockArgs
PsErrCaseCmdInFunAppCmd{} -> suggestParensAndBlockArgs
PsErrIfCmdInFunAppCmd{} -> suggestParensAndBlockArgs
PsErrLetCmdInFunAppCmd{} -> suggestParensAndBlockArgs
PsErrDoCmdInFunAppCmd{} -> suggestParensAndBlockArgs
PsErrDoInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrMDoInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrLambdaInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrCaseInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrLetInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrIfInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrProcInFunAppExpr{} -> suggestParensAndBlockArgs
PsErrMalformedTyOrClDecl{} -> noHints
PsErrIllegalWhereInDataDecl -> [useExtensionInOrderTo "to enable syntax: data T where" LangExt.GADTSyntax]
PsErrIllegalDataTypeContext{} -> [suggestExtension LangExt.DatatypeContexts]
PsErrPrimStringInvalidChar -> noHints
PsErrSuffixAT -> noHints
PsErrPrecedenceOutOfRange{} -> noHints
PsErrSemiColonsInCondExpr{} -> [suggestExtension LangExt.DoAndIfThenElse]
PsErrSemiColonsInCondCmd{} -> [suggestExtension LangExt.DoAndIfThenElse]
PsErrAtInPatPos -> noHints
PsErrParseErrorOnInput{} -> noHints
PsErrMalformedDecl{} -> noHints
PsErrNotADataCon{} -> noHints
PsErrInferredTypeVarNotAllowed -> noHints
PsErrIllegalTraditionalRecordSyntax{} -> [suggestExtension LangExt.TraditionalRecordSyntax]
PsErrParseErrorInCmd{} -> noHints
PsErrInPat _ details -> case details of
PEIP_RecPattern args YesPatIsRecursive ctx
| length args /= 0 -> catMaybes [sug_recdo, sug_missingdo ctx]
| otherwise -> catMaybes [sug_missingdo ctx]
PEIP_OtherPatDetails ctx -> catMaybes [sug_missingdo ctx]
_ -> []
where
sug_recdo = Just (suggestExtension LangExt.RecursiveDo)
sug_missingdo (ParseContext _ YesIncompleteDoBlock) = Just SuggestMissingDo
sug_missingdo _ = Nothing
PsErrParseRightOpSectionInPat{} -> noHints
PsErrIllegalRoleName _ nearby -> [SuggestRoles nearby]
PsErrInvalidTypeSignature reason lhs ->
if | foreign_RDR `looks_like` lhs
-> [suggestExtension LangExt.ForeignFunctionInterface]
| default_RDR `looks_like` lhs
-> [suggestExtension LangExt.DefaultSignatures]
| pattern_RDR `looks_like` lhs
-> [suggestExtension LangExt.PatternSynonyms]
| PsErrInvalidTypeSig_Qualified <- reason
-> [SuggestTypeSignatureRemoveQualifier]
| otherwise
-> []
where
-- A common error is to forget the ForeignFunctionInterface flag
-- so check for that, and suggest. cf #3805
-- Sadly 'foreign import' still barfs 'parse error' because
-- 'import' is a keyword
-- looks_like :: RdrName -> LHsExpr GhcPsErr -> Bool -- AZ
looks_like s (L _ (HsVar _ (L _ v))) = v == s
looks_like s (L _ (HsApp _ lhs _)) = looks_like s lhs
looks_like _ _ = False
foreign_RDR = mkUnqual varName (fsLit "foreign")
default_RDR = mkUnqual varName (fsLit "default")
pattern_RDR = mkUnqual varName (fsLit "pattern")
PsErrUnexpectedTypeInDecl{} -> noHints
PsErrInvalidPackageName{} -> noHints
PsErrIllegalGadtRecordMultiplicity{} -> noHints
PsErrInvalidCApiImport {} -> noHints
PsErrMultipleConForNewtype {} -> noHints
PsErrUnicodeCharLooksLike{} -> noHints
PsErrInvalidPun {} -> [suggestExtension LangExt.ListTuplePuns]
PsErrIllegalOrPat{} -> [suggestExtension LangExt.OrPatterns]
PsErrTypeSyntaxInPat{} -> noHints
diagnosticCode = constructorCode
psHeaderMessageDiagnostic :: PsHeaderMessage -> DecoratedSDoc
psHeaderMessageDiagnostic = \case
PsErrParseLanguagePragma
-> mkSimpleDecorated $
vcat [ text "Cannot parse LANGUAGE pragma"
, text "Expecting comma-separated list of language options,"
, text "each starting with a capital letter"
, nest 2 (text "E.g. {-# LANGUAGE TemplateHaskell, GADTs #-}") ]
PsErrUnsupportedExt unsup _
-> mkSimpleDecorated $ text "Unsupported extension: " <> text unsup
PsErrParseOptionsPragma str
-> mkSimpleDecorated $
vcat [ text "Error while parsing OPTIONS_GHC pragma."
, text "Expecting whitespace-separated list of GHC options."
, text " E.g. {-# OPTIONS_GHC -Wall -O2 #-}"
, text ("Input was: " ++ show str) ]
PsErrUnknownOptionsPragma flag
-> mkSimpleDecorated $ text "Unknown flag in {-# OPTIONS_GHC #-} pragma:" <+> text flag
psHeaderMessageReason :: PsHeaderMessage -> DiagnosticReason
psHeaderMessageReason = \case
PsErrParseLanguagePragma
-> ErrorWithoutFlag
PsErrUnsupportedExt{}
-> ErrorWithoutFlag
PsErrParseOptionsPragma{}
-> ErrorWithoutFlag
PsErrUnknownOptionsPragma{}
-> ErrorWithoutFlag
psHeaderMessageHints :: PsHeaderMessage -> [GhcHint]
psHeaderMessageHints = \case
PsErrParseLanguagePragma
-> noHints
PsErrUnsupportedExt unsup supported
-> if null suggestions
then noHints
-- FIXME(adn) To fix the compiler crash in #19923 we just rewrap this into an
-- UnknownHint, but we should have here a proper hint, but that would require
-- changing 'supportedExtensions' to emit a list of 'Extension'.
else [UnknownHint $ text "Perhaps you meant" <+> quotedListWithOr (map text suggestions)]
where
suggestions :: [String]
suggestions = fuzzyMatch unsup supported
PsErrParseOptionsPragma{}
-> noHints
PsErrUnknownOptionsPragma{}
-> noHints
suggestParensAndBlockArgs :: [GhcHint]
suggestParensAndBlockArgs =
[SuggestParentheses, suggestExtension LangExt.BlockArguments]
pp_unexpected_fun_app :: Outputable a => SDoc -> a -> SDoc
pp_unexpected_fun_app e a =
text "Unexpected " <> e <> text " in function application:"
$$ nest 4 (ppr a)
parse_error_in_pat :: SDoc
parse_error_in_pat = text "Parse error in pattern:"
forallSym :: Bool -> SDoc
forallSym True = text "∀"
forallSym False = text "forall"
pprFileHeaderPragmaType :: FileHeaderPragmaType -> SDoc
pprFileHeaderPragmaType OptionsPrag = text "OPTIONS"
pprFileHeaderPragmaType IncludePrag = text "INCLUDE"
pprFileHeaderPragmaType LanguagePrag = text "LANGUAGE"
pprFileHeaderPragmaType DocOptionsPrag = text "OPTIONS_HADDOCK"