ghc-9.0.2: The GHC API

Safe Haskell	Safe-Inferred
Language	Haskell2010

GHC.Rename.Utils

Synopsis

checkDupRdrNames :: [Located RdrName] -> RnM ()
checkShadowedRdrNames :: [Located RdrName] -> RnM ()
checkDupNames :: [Name] -> RnM ()
checkDupAndShadowedNames :: (GlobalRdrEnv, LocalRdrEnv) -> [Name] -> RnM ()
dupNamesErr :: Outputable n => (n -> SrcSpan) -> NonEmpty n -> RnM ()
checkTupSize :: Int -> RnM ()
addFvRn :: FreeVars -> RnM (thing, FreeVars) -> RnM (thing, FreeVars)
mapFvRn :: (a -> RnM (b, FreeVars)) -> [a] -> RnM ([b], FreeVars)
mapMaybeFvRn :: (a -> RnM (b, FreeVars)) -> Maybe a -> RnM (Maybe b, FreeVars)
warnUnusedMatches :: [Name] -> FreeVars -> RnM ()
warnUnusedTypePatterns :: [Name] -> FreeVars -> RnM ()
warnUnusedTopBinds :: [GlobalRdrElt] -> RnM ()
warnUnusedLocalBinds :: [Name] -> FreeVars -> RnM ()
checkUnusedRecordWildcard :: SrcSpan -> FreeVars -> Maybe [Name] -> RnM ()
mkFieldEnv :: GlobalRdrEnv -> NameEnv (FieldLabelString, Name)
unknownSubordinateErr :: SDoc -> RdrName -> SDoc
badQualBndrErr :: RdrName -> SDoc
typeAppErr :: String -> LHsType GhcPs -> SDoc
data HsDocContext
- = TypeSigCtx SDoc
- | StandaloneKindSigCtx SDoc
- | PatCtx
- | SpecInstSigCtx
- | DefaultDeclCtx
- | ForeignDeclCtx (Located RdrName)
- | DerivDeclCtx
- | RuleCtx FastString
- | TyDataCtx (Located RdrName)
- | TySynCtx (Located RdrName)
- | TyFamilyCtx (Located RdrName)
- | FamPatCtx (Located RdrName)
- | ConDeclCtx [Located Name]
- | ClassDeclCtx (Located RdrName)
- | ExprWithTySigCtx
- | TypBrCtx
- | HsTypeCtx
- | GHCiCtx
- | SpliceTypeCtx (LHsType GhcPs)
- | ClassInstanceCtx
- | GenericCtx SDoc
pprHsDocContext :: HsDocContext -> SDoc
inHsDocContext :: HsDocContext -> SDoc
withHsDocContext :: HsDocContext -> SDoc -> SDoc
newLocalBndrRn :: Located RdrName -> RnM Name
newLocalBndrsRn :: [Located RdrName] -> RnM [Name]
bindLocalNames :: [Name] -> RnM a -> RnM a
bindLocalNamesFV :: [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars)
addNameClashErrRn :: RdrName -> [GlobalRdrElt] -> RnM ()
extendTyVarEnvFVRn :: [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars)
checkInferredVars :: HsDocContext -> Maybe SDoc -> LHsSigType GhcPs -> RnM ()
noNestedForallsContextsErr :: SDoc -> LHsType GhcRn -> Maybe (SrcSpan, SDoc)
addNoNestedForallsContextsErr :: HsDocContext -> SDoc -> LHsType GhcRn -> RnM ()

Documentation

checkDupRdrNames :: [Located RdrName] -> RnM () Source #

checkShadowedRdrNames :: [Located RdrName] -> RnM () Source #

checkDupNames :: [Name] -> RnM () Source #

checkDupAndShadowedNames :: (GlobalRdrEnv, LocalRdrEnv) -> [Name] -> RnM () Source #

dupNamesErr :: Outputable n => (n -> SrcSpan) -> NonEmpty n -> RnM () Source #

checkTupSize :: Int -> RnM () Source #

addFvRn :: FreeVars -> RnM (thing, FreeVars) -> RnM (thing, FreeVars) Source #

mapFvRn :: (a -> RnM (b, FreeVars)) -> [a] -> RnM ([b], FreeVars) Source #

mapMaybeFvRn :: (a -> RnM (b, FreeVars)) -> Maybe a -> RnM (Maybe b, FreeVars) Source #

warnUnusedMatches :: [Name] -> FreeVars -> RnM () Source #

warnUnusedTypePatterns :: [Name] -> FreeVars -> RnM () Source #

warnUnusedTopBinds :: [GlobalRdrElt] -> RnM () Source #

warnUnusedLocalBinds :: [Name] -> FreeVars -> RnM () Source #

checkUnusedRecordWildcard :: SrcSpan -> FreeVars -> Maybe [Name] -> RnM () Source #

Checks to see if we need to warn for -Wunused-record-wildcards or -Wredundant-record-wildcards

mkFieldEnv :: GlobalRdrEnv -> NameEnv (FieldLabelString, Name) Source #

Make a map from selector names to field labels and parent tycon names, to be used when reporting unused record fields.

unknownSubordinateErr :: SDoc -> RdrName -> SDoc Source #

badQualBndrErr :: RdrName -> SDoc Source #

typeAppErr :: String -> LHsType GhcPs -> SDoc Source #

pprHsDocContext :: HsDocContext -> SDoc Source #

inHsDocContext :: HsDocContext -> SDoc Source #

withHsDocContext :: HsDocContext -> SDoc -> SDoc Source #

newLocalBndrRn :: Located RdrName -> RnM Name Source #

newLocalBndrsRn :: [Located RdrName] -> RnM [Name] Source #

bindLocalNames :: [Name] -> RnM a -> RnM a Source #

bindLocalNamesFV :: [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars) Source #

addNameClashErrRn :: RdrName -> [GlobalRdrElt] -> RnM () Source #

extendTyVarEnvFVRn :: [Name] -> RnM (a, FreeVars) -> RnM (a, FreeVars) Source #

checkInferredVars Source #

Arguments

:: HsDocContext
-> Maybe SDoc	The error msg if the signature is not allowed to contain manually written inferred variables.
-> LHsSigType GhcPs
-> RnM ()

Throw an error message if a user attempts to quantify an inferred type variable in a place where specificity cannot be observed. For example, forall {a}. [a] -> [a] would be rejected to the inferred type variable {a}, but forall a. [a] -> [a] would be accepted. See Note [Unobservably inferred type variables].

noNestedForallsContextsErr :: SDoc -> LHsType GhcRn -> Maybe (SrcSpan, SDoc) Source #

Examines a non-outermost type for foralls or contexts, which are assumed to be nested. For example, in the following declaration:

instance forall a. forall b. C (Either a b)

The outermost forall a is fine, but the nested forall b is not. We invoke noNestedForallsContextsErr on the type forall b. C (Either a b) to catch the nested forall and create a suitable error message. noNestedForallsContextsErr returns Just err_msg if such a forall or context is found, and returns Nothing otherwise.

This is currently used in the following places:

In GADT constructor types (in rnConDecl). See Note [GADT abstract syntax] (Wrinkle: No nested foralls or contexts) in GHC.Hs.Type.
In instance declaration types (in rnClsIntDecl and rnSrcDerivDecl in GHC.Rename.Module and renameSig in GHC.Rename.Bind). See Note [No nested foralls or contexts in instance types] in GHC.Hs.Type.

addNoNestedForallsContextsErr :: HsDocContext -> SDoc -> LHsType GhcRn -> RnM () Source #

A common way to invoke noNestedForallsContextsErr.