-- Copyright (c) 2020, Shayne Fletcher. All rights reserved.
-- SPDX-License-Identifier: BSD-3-Clause.

{-# OPTIONS_GHC -Wno-missing-fields #-}
{-# LANGUAGE CPP #-}
{-# LANGUAGE LambdaCase #-}
#include "ghclib_api.h"
module Language.Haskell.GhclibParserEx.GHC.Hs.Expr(
  isTag, isDol, isDot, isReturn, isSection, isRecConstr, isRecUpdate,
  isVar, isPar, isApp, isOpApp, isAnyApp, isLexeme, isLambda, isQuasiQuote, isQuasiQuoteExpr, isQuasiQuoteSplice,  isOverLabel,
  isDotApp, isTypeApp, isWHNF, isLCase,
  isFieldPun, isFieldPunUpdate, isRecStmt, isParComp, isMDo, isListComp, isMonadComp, isTupleSection, isString, isPrimLiteral,
  isSpliceDecl, isFieldWildcard, isUnboxed, isWholeFrac, isStrictMatch, isMultiIf, isProc, isTransStmt,
  hasFieldsDotDot,
  varToStr, strToVar,
  fromChar
  ) where

#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904) || defined(GHCLIB_API_902) || defined (GHCLIB_API_900) || defined (GHCLIB_API_810)
import GHC.Hs
#else
import HsSyn
#endif
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904) || defined(GHCLIB_API_902) || defined (GHCLIB_API_900)
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904) || defined(GHCLIB_API_902)
import GHC.Types.SourceText
#endif
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906)
import Language.Haskell.GhclibParserEx.GHC.Types.Name.Reader
#endif
import GHC.Types.SrcLoc
import GHC.Types.Name.Reader
import GHC.Types.Name
import GHC.Types.Basic
import GHC.Builtin.Types
#else
import SrcLoc
import RdrName
import OccName
import Name
import BasicTypes
import TysWiredIn
#endif
import Data.Ratio

-- 'True' if the provided expression is a variable with name 'tag'.
isTag :: String -> LHsExpr GhcPs -> Bool
isTag :: String -> LHsExpr GhcPs -> Bool
isTag String
tag = \case (L SrcSpanAnnA
_ (HsVar XVar GhcPs
_ (L SrcSpanAnnN
_ RdrName
s))) -> OccName -> String
occNameString (RdrName -> OccName
rdrNameOcc RdrName
s) forall a. Eq a => a -> a -> Bool
== String
tag; LHsExpr GhcPs
_ -> Bool
False

isDot, isDol, isReturn, isSection, isRecConstr, isRecUpdate,
  isVar, isPar, isApp, isOpApp, isAnyApp, isLexeme, isQuasiQuote, isQuasiQuoteExpr,
  isLambda, isDotApp, isTypeApp, isWHNF, isLCase, isOverLabel :: LHsExpr GhcPs -> Bool
isDol :: LHsExpr GhcPs -> Bool
isDol = String -> LHsExpr GhcPs -> Bool
isTag String
"$"
isDot :: LHsExpr GhcPs -> Bool
isDot = String -> LHsExpr GhcPs -> Bool
isTag String
"."
isReturn :: LHsExpr GhcPs -> Bool
isReturn LHsExpr GhcPs
x = String -> LHsExpr GhcPs -> Bool
isTag String
"return" LHsExpr GhcPs
x Bool -> Bool -> Bool
|| String -> LHsExpr GhcPs -> Bool
isTag String
"pure" LHsExpr GhcPs
x -- Allow both 'pure' and 'return' as they have the same semantics.
isSection :: LHsExpr GhcPs -> Bool
isSection = \case (L SrcSpanAnnA
_ SectionL{}) -> Bool
True ; (L SrcSpanAnnA
_ SectionR{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isRecConstr :: LHsExpr GhcPs -> Bool
isRecConstr = \case (L SrcSpanAnnA
_ RecordCon{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isRecUpdate :: LHsExpr GhcPs -> Bool
isRecUpdate = \case (L SrcSpanAnnA
_ RecordUpd{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isVar :: LHsExpr GhcPs -> Bool
isVar = \case (L SrcSpanAnnA
_ HsVar{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isPar :: LHsExpr GhcPs -> Bool
isPar = \case (L SrcSpanAnnA
_ HsPar{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isApp :: LHsExpr GhcPs -> Bool
isApp = \case (L SrcSpanAnnA
_ HsApp{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isOpApp :: LHsExpr GhcPs -> Bool
isOpApp = \case (L SrcSpanAnnA
_ OpApp{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isAnyApp :: LHsExpr GhcPs -> Bool
isAnyApp LHsExpr GhcPs
x = LHsExpr GhcPs -> Bool
isApp LHsExpr GhcPs
x Bool -> Bool -> Bool
|| LHsExpr GhcPs -> Bool
isOpApp LHsExpr GhcPs
x
isLexeme :: LHsExpr GhcPs -> Bool
isLexeme = \case (L SrcSpanAnnA
_ HsVar{}) -> Bool
True; (L SrcSpanAnnA
_ HsOverLit{}) -> Bool
True; (L SrcSpanAnnA
_ HsLit{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isLambda :: LHsExpr GhcPs -> Bool
isLambda = \case (L SrcSpanAnnA
_ HsLam{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906)
isQuasiQuoteExpr :: LHsExpr GhcPs -> Bool
isQuasiQuoteExpr = \case (L SrcSpanAnnA
_ (HsUntypedSplice XUntypedSplice GhcPs
_ HsQuasiQuote{})) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
#else
isQuasiQuoteExpr = \case (L _ (HsSpliceE _ HsQuasiQuote{})) -> True; _ -> False
#endif
isQuasiQuote :: LHsExpr GhcPs -> Bool
isQuasiQuote = LHsExpr GhcPs -> Bool
isQuasiQuoteExpr -- Backwards compat.
isDotApp :: LHsExpr GhcPs -> Bool
isDotApp = \case (L SrcSpanAnnA
_ (OpApp XOpApp GhcPs
_ LHsExpr GhcPs
_ LHsExpr GhcPs
op LHsExpr GhcPs
_)) -> LHsExpr GhcPs -> Bool
isDot LHsExpr GhcPs
op; LHsExpr GhcPs
_ -> Bool
False
isTypeApp :: LHsExpr GhcPs -> Bool
isTypeApp = \case (L SrcSpanAnnA
_ HsAppType{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isWHNF :: LHsExpr GhcPs -> Bool
isWHNF = \case
  (L SrcSpanAnnA
_ (HsVar XVar GhcPs
_ (L SrcSpanAnnN
_ RdrName
x))) -> RdrName -> Bool
isRdrDataCon RdrName
x
  (L SrcSpanAnnA
_ (HsLit XLitE GhcPs
_ HsLit GhcPs
x)) -> case HsLit GhcPs
x of HsString{} -> Bool
False; HsInt{} -> Bool
False; HsRat{} -> Bool
False; HsLit GhcPs
_ -> Bool
True
  (L SrcSpanAnnA
_ HsLam{}) -> Bool
True
  (L SrcSpanAnnA
_ ExplicitTuple{}) -> Bool
True
  (L SrcSpanAnnA
_ ExplicitList{}) -> Bool
True
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
  (L SrcSpanAnnA
_ (HsPar XPar GhcPs
_ LHsToken "(" GhcPs
_ LHsExpr GhcPs
x LHsToken ")" GhcPs
_)) -> LHsExpr GhcPs -> Bool
isWHNF LHsExpr GhcPs
x
#else
  (L _ (HsPar _ x)) -> isWHNF x
#endif
  (L SrcSpanAnnA
_ (ExprWithTySig XExprWithTySig GhcPs
_ LHsExpr GhcPs
x LHsSigWcType (NoGhcTc GhcPs)
_)) -> LHsExpr GhcPs -> Bool
isWHNF LHsExpr GhcPs
x
  -- Other (unknown) constructors may have bang patterns in them, so
  -- approximate.
  (L SrcSpanAnnA
_ (HsApp XApp GhcPs
_ (L SrcSpanAnnA
_ (HsVar XVar GhcPs
_ (L SrcSpanAnnN
_ RdrName
x))) LHsExpr GhcPs
_))
    | OccName -> String
occNameString (RdrName -> OccName
rdrNameOcc RdrName
x) forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [String
"Just", String
"Left", String
"Right"] -> Bool
True
  LHsExpr GhcPs
_ -> Bool
False
isLCase :: LHsExpr GhcPs -> Bool
isLCase = \case (L SrcSpanAnnA
_ HsLamCase{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False
isOverLabel :: LHsExpr GhcPs -> Bool
isOverLabel = \case (L SrcSpanAnnA
_ HsOverLabel{}) -> Bool
True; LHsExpr GhcPs
_ -> Bool
False

#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906)
isQuasiQuoteSplice :: HsUntypedSplice GhcPs -> Bool
#else
isQuasiQuoteSplice :: HsSplice GhcPs -> Bool
#endif
isQuasiQuoteSplice :: HsUntypedSplice GhcPs -> Bool
isQuasiQuoteSplice = \case HsQuasiQuote{} -> Bool
True; HsUntypedSplice GhcPs
_ -> Bool
False


#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904) || defined(GHCLIB_API_902) || defined (GHCLIB_API_901)
isStrictMatch :: HsMatchContext GhcPs -> Bool
#else
isStrictMatch :: HsMatchContext RdrName -> Bool
#endif
isStrictMatch :: HsMatchContext GhcPs -> Bool
isStrictMatch = \case FunRhs{mc_strictness :: forall p. HsMatchContext p -> SrcStrictness
mc_strictness=SrcStrictness
SrcStrict} -> Bool
True; HsMatchContext GhcPs
_ -> Bool
False

-- Field is punned e.g. '{foo}'.
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
isFieldPun :: LHsFieldBind GhcPs (LFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
isFieldPun :: LHsFieldBind GhcPs (LFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
isFieldPun = \case (L SrcSpanAnnA
_ HsFieldBind {hfbPun :: forall lhs rhs. HsFieldBind lhs rhs -> Bool
hfbPun=Bool
True}) -> Bool
True; LHsFieldBind GhcPs (LFieldOcc GhcPs) (LHsExpr GhcPs)
_ -> Bool
False
#else
isFieldPun :: LHsRecField GhcPs (LHsExpr GhcPs) -> Bool
isFieldPun = \case (L _ HsRecField {hsRecPun=True}) -> True; _ -> False
#endif
-- Field puns in updates have a different type to field puns in
-- constructions.
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
isFieldPunUpdate :: HsFieldBind (LAmbiguousFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
isFieldPunUpdate :: HsFieldBind (LAmbiguousFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
isFieldPunUpdate = \case HsFieldBind {hfbPun :: forall lhs rhs. HsFieldBind lhs rhs -> Bool
hfbPun=Bool
True} -> Bool
True; HsFieldBind (LAmbiguousFieldOcc GhcPs) (LHsExpr GhcPs)
_ -> Bool
False
#else
isFieldPunUpdate :: HsRecField' (AmbiguousFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
isFieldPunUpdate = \case HsRecField {hsRecPun=True} -> True; _ -> False
#endif

-- Contains a '..' as in 'Foo{..}'
hasFieldsDotDot :: HsRecFields GhcPs (LHsExpr GhcPs) -> Bool
hasFieldsDotDot :: HsRecFields GhcPs (LHsExpr GhcPs) -> Bool
hasFieldsDotDot = \case HsRecFields {rec_dotdot :: forall p arg. HsRecFields p arg -> Maybe (XRec p RecFieldsDotDot)
rec_dotdot=Just XRec GhcPs RecFieldsDotDot
_} -> Bool
True; HsRecFields GhcPs (LHsExpr GhcPs)
_ -> Bool
False

isRecStmt :: StmtLR GhcPs GhcPs (LHsExpr GhcPs) -> Bool
isRecStmt :: StmtLR GhcPs GhcPs (LHsExpr GhcPs) -> Bool
isRecStmt = \case RecStmt{} -> Bool
True; StmtLR GhcPs GhcPs (LHsExpr GhcPs)
_ -> Bool
False

isParComp :: StmtLR GhcPs GhcPs (LHsExpr GhcPs) -> Bool
isParComp :: StmtLR GhcPs GhcPs (LHsExpr GhcPs) -> Bool
isParComp = \case ParStmt{} -> Bool
True; StmtLR GhcPs GhcPs (LHsExpr GhcPs)
_ -> Bool
False

-- TODO: Seems `HsStmtContext (HsDoRn p)` on master right now.
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
isMDo :: HsDoFlavour -> Bool
isMDo :: HsDoFlavour -> Bool
isMDo = \case MDoExpr Maybe ModuleName
_ -> Bool
True; HsDoFlavour
_ -> Bool
False
isMonadComp :: HsDoFlavour -> Bool
isMonadComp :: HsDoFlavour -> Bool
isMonadComp = \case HsDoFlavour
MonadComp -> Bool
True; HsDoFlavour
_ -> Bool
False
isListComp :: HsDoFlavour -> Bool
isListComp :: HsDoFlavour -> Bool
isListComp = \case HsDoFlavour
ListComp -> Bool
True; HsDoFlavour
_ -> Bool
False
#elif defined(GHCLIB_API_902) || defined (GHCLIB_API_900)
isMDo :: HsStmtContext GhcRn -> Bool
isMDo = \case MDoExpr _ -> True; _ -> False
isMonadComp :: HsStmtContext GhcRn -> Bool
isMonadComp = \case MonadComp -> True; _ -> False
isListComp :: HsStmtContext GhcRn -> Bool
isListComp = \case ListComp -> True; _ -> False
#else
isMDo :: HsStmtContext Name -> Bool
isMDo = \case MDoExpr -> True; _ -> False
isMonadComp :: HsStmtContext Name -> Bool
isMonadComp = \case MonadComp -> True; _ -> False
isListComp :: HsStmtContext Name -> Bool
isListComp = \case ListComp -> True; _ -> False
#endif

isTupleSection :: HsTupArg GhcPs -> Bool
isTupleSection :: HsTupArg GhcPs -> Bool
isTupleSection = \case Missing{} -> Bool
True; HsTupArg GhcPs
_ -> Bool
False

isString :: HsLit GhcPs -> Bool
isString :: HsLit GhcPs -> Bool
isString = \case HsString{} -> Bool
True; HsLit GhcPs
_ -> Bool
False

isPrimLiteral :: HsLit GhcPs -> Bool
isPrimLiteral :: HsLit GhcPs -> Bool
isPrimLiteral = \case
  HsCharPrim{} -> Bool
True
  HsStringPrim{} -> Bool
True
  HsIntPrim{} -> Bool
True
  HsWordPrim{} -> Bool
True
  HsInt64Prim{} -> Bool
True
  HsWord64Prim{} -> Bool
True
  HsFloatPrim{} -> Bool
True
  HsDoublePrim{} -> Bool
True
  HsLit GhcPs
_ -> Bool
False

isSpliceDecl :: HsExpr GhcPs -> Bool
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906)
isSpliceDecl :: HsExpr GhcPs -> Bool
isSpliceDecl = \case
  HsTypedSplice{} -> Bool
True
  HsUntypedSplice{} -> Bool
True
  HsExpr GhcPs
_ -> Bool
False
#else
isSpliceDecl = \case HsSpliceE{} -> True; _ -> False
#endif

isMultiIf :: HsExpr GhcPs -> Bool
isMultiIf :: HsExpr GhcPs -> Bool
isMultiIf = \case HsMultiIf{} -> Bool
True; HsExpr GhcPs
_ -> Bool
False

isProc :: HsExpr GhcPs -> Bool
isProc :: HsExpr GhcPs -> Bool
isProc = \case HsProc{} -> Bool
True; HsExpr GhcPs
_ -> Bool
False

isTransStmt :: StmtLR GhcPs GhcPs (LHsExpr GhcPs) -> Bool
isTransStmt :: StmtLR GhcPs GhcPs (LHsExpr GhcPs) -> Bool
isTransStmt = \case TransStmt{} -> Bool
True; StmtLR GhcPs GhcPs (LHsExpr GhcPs)
_ -> Bool
False

-- Field has a '_' as in '{foo=_} or is punned e.g. '{foo}'.
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
isFieldWildcard :: LHsFieldBind GhcPs (LFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
#else
isFieldWildcard :: LHsRecField GhcPs (LHsExpr GhcPs) -> Bool
#endif
isFieldWildcard :: LHsFieldBind GhcPs (LFieldOcc GhcPs) (LHsExpr GhcPs) -> Bool
isFieldWildcard = \case
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906)
-- Use `Language.Haskell.GhcLibParserEx.GHC.Types.Name.Reader`s `occNameStr` since `HsUnboundVar` now contains a `RdrName` not an `OccName`.
  (L SrcSpanAnnA
_ HsFieldBind {hfbRHS :: forall lhs rhs. HsFieldBind lhs rhs -> rhs
hfbRHS=(L SrcSpanAnnA
_ (HsUnboundVar XUnboundVar GhcPs
_ RdrName
s))}) -> RdrName -> String
occNameStr RdrName
s forall a. Eq a => a -> a -> Bool
== String
"_"
#elif defined (GHCLIB_API_904)
  (L _ HsFieldBind {hfbRHS=(L _ (HsUnboundVar _ s))}) -> occNameString s == "_"
#elif defined(GHCLIB_API_902) || defined (GHCLIB_API_900)
  (L _ HsRecField {hsRecFieldArg=(L _ (HsUnboundVar _ s))}) -> occNameString s == "_"
#elif defined (GHCLIB_API_810)
  (L _ HsRecField {hsRecFieldArg=(L _ (HsUnboundVar _ _))}) -> True
#else
  (L _ HsRecField {hsRecFieldArg=(L _ (EWildPat _))}) -> True
#endif
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
  (L SrcSpanAnnA
_ HsFieldBind {hfbPun :: forall lhs rhs. HsFieldBind lhs rhs -> Bool
hfbPun=Bool
True}) -> Bool
True
  (L SrcSpanAnnA
_ HsFieldBind {}) -> Bool
False
#else
  (L _ HsRecField {hsRecPun=True}) -> True
  (L _ HsRecField {}) -> False
#endif

isUnboxed :: Boxity -> Bool
isUnboxed :: Boxity -> Bool
isUnboxed = \case Boxity
Unboxed -> Bool
True; Boxity
_ -> Bool
False

isWholeFrac :: HsExpr GhcPs -> Bool

#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904)
isWholeFrac :: HsExpr GhcPs -> Bool
isWholeFrac (HsLit XLitE GhcPs
_ (HsRat XHsRat GhcPs
_ fl :: FractionalLit
fl@FL{} Type
_)) = forall a. Ratio a -> a
denominator (FractionalLit -> Rational
rationalFromFractionalLit FractionalLit
fl) forall a. Eq a => a -> a -> Bool
== Integer
1
isWholeFrac (HsOverLit XOverLitE GhcPs
_ (OverLit XOverLit GhcPs
_ (HsFractional fl :: FractionalLit
fl@FL {}) )) = forall a. Ratio a -> a
denominator (FractionalLit -> Rational
rationalFromFractionalLit FractionalLit
fl) forall a. Eq a => a -> a -> Bool
== Integer
1
#elif defined(GHCLIB_API_902)
isWholeFrac (HsLit _ (HsRat _ fl@FL{} _)) = denominator (rationalFromFractionalLit fl) == 1
isWholeFrac (HsOverLit _ (OverLit _ (HsFractional fl@FL {}) _)) = denominator (rationalFromFractionalLit fl) == 1
#else
isWholeFrac (HsLit _ (HsRat _ (FL _ _ v) _)) = denominator v == 1
isWholeFrac (HsOverLit _ (OverLit _ (HsFractional (FL _ _ v)) _)) = denominator v == 1
#endif
isWholeFrac HsExpr GhcPs
_ = Bool
False

varToStr :: LHsExpr GhcPs -> String
varToStr :: LHsExpr GhcPs -> String
varToStr (L SrcSpanAnnA
_ (HsVar XVar GhcPs
_ (L SrcSpanAnnN
_ RdrName
n)))
  | RdrName
n forall a. Eq a => a -> a -> Bool
== RdrName
consDataCon_RDR = String
":"
  | RdrName
n forall a. Eq a => a -> a -> Bool
== Name -> RdrName
nameRdrName Name
nilDataConName = String
"[]"
  | RdrName
n forall a. Eq a => a -> a -> Bool
== Name -> RdrName
nameRdrName (forall a. NamedThing a => a -> Name
getName (Boxity -> Arity -> DataCon
tupleDataCon Boxity
Boxed Arity
0)) = String
"()"
  | Bool
otherwise = OccName -> String
occNameString (RdrName -> OccName
rdrNameOcc RdrName
n)
varToStr LHsExpr GhcPs
_ = String
""

strToVar :: String -> LHsExpr GhcPs
#if defined (GHCLIB_API_HEAD) || defined (GHCLIB_API_906) || defined (GHCLIB_API_904) || defined(GHCLIB_API_902)
strToVar :: String -> LHsExpr GhcPs
strToVar String
x = forall a an. a -> LocatedAn an a
noLocA forall a b. (a -> b) -> a -> b
$ forall p. XVar p -> LIdP p -> HsExpr p
HsVar NoExtField
noExtField (forall a an. a -> LocatedAn an a
noLocA forall a b. (a -> b) -> a -> b
$ OccName -> RdrName
mkRdrUnqual (String -> OccName
mkVarOcc String
x))
#elif defined (GHCLIB_API_900) || defined (GHCLIB_API_810)
strToVar x = noLoc $ HsVar noExtField (noLoc $ mkRdrUnqual (mkVarOcc x))
#else
strToVar x = noLoc $ HsVar noExt (noLoc $ mkRdrUnqual (mkVarOcc x))
#endif

fromChar :: LHsExpr GhcPs -> Maybe Char
fromChar :: LHsExpr GhcPs -> Maybe Char
fromChar = \case (L SrcSpanAnnA
_ (HsLit XLitE GhcPs
_ (HsChar XHsChar GhcPs
_ Char
x))) -> forall a. a -> Maybe a
Just Char
x; LHsExpr GhcPs
_ -> forall a. Maybe a
Nothing