ghc-lib-parser-0.20211001: compiler/GHC/Tc/Errors/Ppr.hs
{-# LANGUAGE LambdaCase #-}
{-# OPTIONS_GHC -fno-warn-orphans #-} -- instance Diagnostic TcRnMessage
{-# LANGUAGE RecordWildCards #-}
module GHC.Tc.Errors.Ppr (
formatLevPolyErr
, pprLevityPolyInType
) where
import GHC.Prelude
import GHC.Core.Class (Class(..))
import GHC.Core.Coercion (pprCoAxBranchUser)
import GHC.Core.Coercion.Axiom (coAxiomTyCon, coAxiomSingleBranch)
import GHC.Core.FamInstEnv (famInstAxiom)
import GHC.Core.InstEnv
import GHC.Core.TyCo.Ppr (pprKind, pprParendType, pprType, pprWithTYPE, pprWithExplicitKindsWhen)
import GHC.Core.Type
import GHC.Data.Bag
import GHC.Tc.Errors.Types
import GHC.Tc.Types.Rank (Rank(..))
import GHC.Tc.Utils.TcType (tcSplitForAllTyVars)
import GHC.Types.Error
import GHC.Types.FieldLabel (flIsOverloaded, flSelector)
import GHC.Types.Id (isRecordSelector)
import GHC.Types.Name
import GHC.Types.Name.Reader (GreName(..), pprNameProvenance)
import GHC.Types.SrcLoc (GenLocated(..))
import GHC.Types.TyThing
import GHC.Types.Var.Env (emptyTidyEnv)
import GHC.Types.Var.Set (pprVarSet, pluralVarSet)
import GHC.Driver.Flags
import GHC.Hs
import GHC.Utils.Outputable
import GHC.Utils.Misc (capitalise)
import GHC.Unit.State (pprWithUnitState, UnitState)
import qualified GHC.LanguageExtensions as LangExt
import qualified Data.List.NonEmpty as NE
instance Diagnostic TcRnMessage where
diagnosticMessage = \case
TcRnUnknownMessage m
-> diagnosticMessage m
TcLevityPolyInType ty prov (ErrInfo extra supplementary)
-> mkDecorated [pprLevityPolyInType ty prov, extra, supplementary]
TcRnMessageWithInfo unit_state msg_with_info
-> case msg_with_info of
TcRnMessageDetailed err_info msg
-> messageWithInfoDiagnosticMessage unit_state err_info (diagnosticMessage msg)
TcRnImplicitLift id_or_name ErrInfo{..}
-> mkDecorated $
( text "The variable" <+> quotes (ppr id_or_name) <+>
text "is implicitly lifted in the TH quotation"
) : [errInfoContext, errInfoSupplementary]
TcRnUnusedPatternBinds bind
-> mkDecorated [hang (text "This pattern-binding binds no variables:") 2 (ppr bind)]
TcRnDodgyImports name
-> mkDecorated [dodgy_msg (text "import") name (dodgy_msg_insert name :: IE GhcPs)]
TcRnDodgyExports name
-> mkDecorated [dodgy_msg (text "export") name (dodgy_msg_insert name :: IE GhcRn)]
TcRnMissingImportList ie
-> mkDecorated [ text "The import item" <+> quotes (ppr ie) <+>
text "does not have an explicit import list"
]
TcRnUnsafeDueToPlugin
-> mkDecorated [text "Use of plugins makes the module unsafe"]
TcRnModMissingRealSrcSpan mod
-> mkDecorated [text "Module does not have a RealSrcSpan:" <+> ppr mod]
TcRnIdNotExportedFromModuleSig name mod
-> mkDecorated [ text "The identifier" <+> ppr (occName name) <+>
text "does not exist in the signature for" <+> ppr mod
]
TcRnIdNotExportedFromLocalSig name
-> mkDecorated [ text "The identifier" <+> ppr (occName name) <+>
text "does not exist in the local signature."
]
TcRnShadowedName occ provenance
-> let shadowed_locs = case provenance of
ShadowedNameProvenanceLocal n -> [text "bound at" <+> ppr n]
ShadowedNameProvenanceGlobal gres -> map pprNameProvenance gres
in mkSimpleDecorated $
sep [text "This binding for" <+> quotes (ppr occ)
<+> text "shadows the existing binding" <> plural shadowed_locs,
nest 2 (vcat shadowed_locs)]
TcRnDuplicateWarningDecls d rdr_name
-> mkSimpleDecorated $
vcat [text "Multiple warning declarations for" <+> quotes (ppr rdr_name),
text "also at " <+> ppr (getLocA d)]
TcRnSimplifierTooManyIterations simples limit wc
-> mkSimpleDecorated $
hang (text "solveWanteds: too many iterations"
<+> parens (text "limit =" <+> ppr limit))
2 (vcat [ text "Unsolved:" <+> ppr wc
, text "Simples:" <+> ppr simples
])
TcRnIllegalPatSynDecl rdrname
-> mkSimpleDecorated $
hang (text "Illegal pattern synonym declaration for" <+> quotes (ppr rdrname))
2 (text "Pattern synonym declarations are only valid at top level")
TcRnLinearPatSyn ty
-> mkSimpleDecorated $
hang (text "Pattern synonyms do not support linear fields (GHC #18806):") 2 (ppr ty)
TcRnEmptyRecordUpdate
-> mkSimpleDecorated $ text "Empty record update"
TcRnIllegalFieldPunning fld
-> mkSimpleDecorated $ text "Illegal use of punning for field" <+> quotes (ppr fld)
TcRnIllegalWildcardsInRecord fld_part
-> mkSimpleDecorated $ text "Illegal `..' in record" <+> pprRecordFieldPart fld_part
TcRnDuplicateFieldName fld_part dups
-> mkSimpleDecorated $
hsep [text "duplicate field name",
quotes (ppr (NE.head dups)),
text "in record", pprRecordFieldPart fld_part]
TcRnIllegalViewPattern pat
-> mkSimpleDecorated $ vcat [text "Illegal view pattern: " <+> ppr pat]
TcRnCharLiteralOutOfRange c
-> mkSimpleDecorated $ text "character literal out of range: '\\" <> char c <> char '\''
TcRnIllegalWildcardsInConstructor con
-> mkSimpleDecorated $
vcat [ text "Illegal `..' notation for constructor" <+> quotes (ppr con)
, nest 2 (text "The constructor has no labelled fields") ]
TcRnIgnoringAnnotations anns
-> mkSimpleDecorated $
text "Ignoring ANN annotation" <> plural anns <> comma
<+> text "because this is a stage-1 compiler without -fexternal-interpreter or doesn't support GHCi"
TcRnAnnotationInSafeHaskell
-> mkSimpleDecorated $
vcat [ text "Annotations are not compatible with Safe Haskell."
, text "See https://gitlab.haskell.org/ghc/ghc/issues/10826" ]
TcRnInvalidTypeApplication fun_ty hs_ty
-> mkSimpleDecorated $
text "Cannot apply expression of type" <+> quotes (ppr fun_ty) $$
text "to a visible type argument" <+> quotes (ppr hs_ty)
TcRnTagToEnumMissingValArg
-> mkSimpleDecorated $
text "tagToEnum# must appear applied to one value argument"
TcRnTagToEnumUnspecifiedResTy ty
-> mkSimpleDecorated $
hang (text "Bad call to tagToEnum# at type" <+> ppr ty)
2 (vcat [ text "Specify the type by giving a type signature"
, text "e.g. (tagToEnum# x) :: Bool" ])
TcRnTagToEnumResTyNotAnEnum ty
-> mkSimpleDecorated $
hang (text "Bad call to tagToEnum# at type" <+> ppr ty)
2 (text "Result type must be an enumeration type")
TcRnArrowIfThenElsePredDependsOnResultTy
-> mkSimpleDecorated $
text "Predicate type of `ifThenElse' depends on result type"
TcRnArrowCommandExpected cmd
-> mkSimpleDecorated $
vcat [text "The expression", nest 2 (ppr cmd),
text "was found where an arrow command was expected"]
TcRnIllegalHsBootFileDecl
-> mkSimpleDecorated $
text "Illegal declarations in an hs-boot file"
TcRnRecursivePatternSynonym binds
-> mkSimpleDecorated $
hang (text "Recursive pattern synonym definition with following bindings:")
2 (vcat $ map pprLBind . bagToList $ binds)
where
pprLoc loc = parens (text "defined at" <+> ppr loc)
pprLBind :: GenLocated (SrcSpanAnn' a) (HsBindLR GhcRn idR) -> SDoc
pprLBind (L loc bind) = pprWithCommas ppr (collectHsBindBinders CollNoDictBinders bind)
<+> pprLoc (locA loc)
TcRnPartialTypeSigTyVarMismatch n1 n2 fn_name hs_ty
-> mkSimpleDecorated $
hang (text "Couldn't match" <+> quotes (ppr n1)
<+> text "with" <+> quotes (ppr n2))
2 (hang (text "both bound by the partial type signature:")
2 (ppr fn_name <+> dcolon <+> ppr hs_ty))
TcRnPartialTypeSigBadQuantifier n fn_name hs_ty
-> mkSimpleDecorated $
hang (text "Can't quantify over" <+> quotes (ppr n))
2 (hang (text "bound by the partial type signature:")
2 (ppr fn_name <+> dcolon <+> ppr hs_ty))
TcRnPolymorphicBinderMissingSig n ty
-> mkSimpleDecorated $
sep [ text "Polymorphic local binding with no type signature:"
, nest 2 $ pprPrefixName n <+> dcolon <+> ppr ty ]
TcRnOverloadedSig sig
-> mkSimpleDecorated $
hang (text "Overloaded signature conflicts with monomorphism restriction")
2 (ppr sig)
TcRnTupleConstraintInst _
-> mkSimpleDecorated $ text "You can't specify an instance for a tuple constraint"
TcRnAbstractClassInst clas
-> mkSimpleDecorated $
text "Cannot define instance for abstract class" <+>
quotes (ppr (className clas))
TcRnNoClassInstHead tau
-> mkSimpleDecorated $
hang (text "Instance head is not headed by a class:") 2 (pprType tau)
TcRnUserTypeError ty
-> mkSimpleDecorated (pprUserTypeErrorTy ty)
TcRnConstraintInKind ty
-> mkSimpleDecorated $
text "Illegal constraint in a kind:" <+> pprType ty
TcRnUnboxedTupleTypeFuncArg ty
-> mkSimpleDecorated $
sep [ text "Illegal unboxed tuple type as function argument:"
, pprType ty ]
TcRnLinearFuncInKind ty
-> mkSimpleDecorated $
text "Illegal linear function in a kind:" <+> pprType ty
TcRnForAllEscapeError ty kind
-> mkSimpleDecorated $ vcat
[ hang (text "Quantified type's kind mentions quantified type variable")
2 (text "type:" <+> quotes (ppr ty))
, hang (text "where the body of the forall has this kind:")
2 (quotes (pprKind kind)) ]
TcRnVDQInTermType ty
-> mkSimpleDecorated $ vcat
[ hang (text "Illegal visible, dependent quantification" <+>
text "in the type of a term:")
2 (pprType ty)
, text "(GHC does not yet support this)" ]
TcRnIllegalEqualConstraints ty
-> mkSimpleDecorated $
text "Illegal equational constraint" <+> pprType ty
TcRnBadQuantPredHead ty
-> mkSimpleDecorated $
hang (text "Quantified predicate must have a class or type variable head:")
2 (pprType ty)
TcRnIllegalTupleConstraint ty
-> mkSimpleDecorated $
text "Illegal tuple constraint:" <+> pprType ty
TcRnNonTypeVarArgInConstraint ty
-> mkSimpleDecorated $
hang (text "Non type-variable argument")
2 (text "in the constraint:" <+> pprType ty)
TcRnIllegalImplicitParam ty
-> mkSimpleDecorated $
text "Illegal implicit parameter" <+> quotes (pprType ty)
TcRnIllegalConstraintSynonymOfKind kind
-> mkSimpleDecorated $
text "Illegal constraint synonym of kind:" <+> quotes (pprKind kind)
TcRnIllegalClassInst tcf
-> mkSimpleDecorated $
vcat [ text "Illegal instance for a" <+> ppr tcf
, text "A class instance must be for a class" ]
TcRnOversaturatedVisibleKindArg ty
-> mkSimpleDecorated $
text "Illegal oversaturated visible kind argument:" <+>
quotes (char '@' <> pprParendType ty)
TcRnBadAssociatedType clas tc
-> mkSimpleDecorated $
hsep [ text "Class", quotes (ppr clas)
, text "does not have an associated type", quotes (ppr tc) ]
TcRnForAllRankErr rank ty
-> let herald = case tcSplitForAllTyVars ty of
([], _) -> text "Illegal qualified type:"
_ -> text "Illegal polymorphic type:"
extra = case rank of
MonoTypeConstraint -> text "A constraint must be a monotype"
_ -> empty
in mkSimpleDecorated $ vcat [hang herald 2 (pprType ty), extra]
TcRnMonomorphicBindings bindings
-> let pp_bndrs = pprBindings bindings
in mkSimpleDecorated $
sep [ text "The Monomorphism Restriction applies to the binding"
<> plural bindings
, text "for" <+> pp_bndrs ]
TcRnOrphanInstance inst
-> mkSimpleDecorated $
hsep [ text "Orphan instance:"
, pprInstanceHdr inst
]
TcRnFunDepConflict unit_state sorted
-> let herald = text "Functional dependencies conflict between instance declarations:"
in mkSimpleDecorated $
pprWithUnitState unit_state $ (hang herald 2 (pprInstances $ NE.toList sorted))
TcRnDupInstanceDecls unit_state sorted
-> let herald = text "Duplicate instance declarations:"
in mkSimpleDecorated $
pprWithUnitState unit_state $ (hang herald 2 (pprInstances $ NE.toList sorted))
TcRnConflictingFamInstDecls sortedNE
-> let sorted = NE.toList sortedNE
in mkSimpleDecorated $
hang (text "Conflicting family instance declarations:")
2 (vcat [ pprCoAxBranchUser (coAxiomTyCon ax) (coAxiomSingleBranch ax)
| fi <- sorted
, let ax = famInstAxiom fi ])
TcRnFamInstNotInjective rea fam_tc (eqn1 NE.:| rest_eqns)
-> let (herald, show_kinds) = case rea of
InjErrRhsBareTyVar tys ->
(injectivityErrorHerald $$
text "RHS of injective type family equation is a bare" <+>
text "type variable" $$
text "but these LHS type and kind patterns are not bare" <+>
text "variables:" <+> pprQuotedList tys, False)
InjErrRhsCannotBeATypeFam ->
(injectivityErrorHerald $$
text "RHS of injective type family equation cannot" <+>
text "be a type family:", False)
InjErrRhsOverlap ->
(text "Type family equation right-hand sides overlap; this violates" $$
text "the family's injectivity annotation:", False)
InjErrCannotInferFromRhs tvs has_kinds _ ->
let show_kinds = has_kinds == YesHasKinds
what = if show_kinds then text "Type/kind" else text "Type"
body = sep [ what <+> text "variable" <>
pluralVarSet tvs <+> pprVarSet tvs (pprQuotedList . scopedSort)
, text "cannot be inferred from the right-hand side." ]
in (injectivityErrorHerald $$ body $$ text "In the type family equation:", show_kinds)
in mkSimpleDecorated $ pprWithExplicitKindsWhen show_kinds $
hang herald
2 (vcat (map (pprCoAxBranchUser fam_tc) (eqn1 : rest_eqns)))
TcRnBangOnUnliftedType ty
-> mkSimpleDecorated $
text "Strictness flag has no effect on unlifted type" <+> quotes (ppr ty)
TcRnMultipleDefaultDeclarations dup_things
-> mkSimpleDecorated $
hang (text "Multiple default declarations")
2 (vcat (map pp dup_things))
where
pp :: LDefaultDecl GhcRn -> SDoc
pp (L locn (DefaultDecl _ _))
= text "here was another default declaration" <+> ppr (locA locn)
TcRnBadDefaultType ty deflt_clss
-> mkSimpleDecorated $
hang (text "The default type" <+> quotes (ppr ty) <+> text "is not an instance of")
2 (foldr1 (\a b -> a <+> text "or" <+> b) (map (quotes. ppr) deflt_clss))
TcRnPatSynBundledWithNonDataCon
-> mkSimpleDecorated $
text "Pattern synonyms can be bundled only with datatypes."
TcRnPatSynBundledWithWrongType expected_res_ty res_ty
-> mkSimpleDecorated $
text "Pattern synonyms can only be bundled with matching type constructors"
$$ text "Couldn't match expected type of"
<+> quotes (ppr expected_res_ty)
<+> text "with actual type of"
<+> quotes (ppr res_ty)
TcRnDupeModuleExport mod
-> mkSimpleDecorated $
hsep [ text "Duplicate"
, quotes (text "Module" <+> ppr mod)
, text "in export list" ]
TcRnExportedModNotImported mod
-> mkSimpleDecorated
$ formatExportItemError
(text "module" <+> ppr mod)
"is not imported"
TcRnNullExportedModule mod
-> mkSimpleDecorated
$ formatExportItemError
(text "module" <+> ppr mod)
"exports nothing"
TcRnMissingExportList mod
-> mkSimpleDecorated
$ formatExportItemError
(text "module" <+> ppr mod)
"is missing an export list"
TcRnExportHiddenComponents export_item
-> mkSimpleDecorated
$ formatExportItemError
(ppr export_item)
"attempts to export constructors or class methods that are not visible here"
TcRnDuplicateExport child ie1 ie2
-> mkSimpleDecorated $
hsep [ quotes (ppr child)
, text "is exported by", quotes (ppr ie1)
, text "and", quotes (ppr ie2) ]
TcRnExportedParentChildMismatch parent_name ty_thing child parent_names
-> mkSimpleDecorated $
text "The type constructor" <+> quotes (ppr parent_name)
<+> text "is not the parent of the" <+> text what_is
<+> quotes thing <> char '.'
$$ text (capitalise what_is)
<> text "s can only be exported with their parent type constructor."
$$ (case parents of
[] -> empty
[_] -> text "Parent:"
_ -> text "Parents:") <+> fsep (punctuate comma parents)
where
pp_category :: TyThing -> String
pp_category (AnId i)
| isRecordSelector i = "record selector"
pp_category i = tyThingCategory i
what_is = pp_category ty_thing
thing = ppr child
parents = map ppr parent_names
TcRnConflictingExports occ child1 gre1 ie1 child2 gre2 ie2
-> mkSimpleDecorated $
vcat [ text "Conflicting exports for" <+> quotes (ppr occ) <> colon
, ppr_export child1 gre1 ie1
, ppr_export child2 gre2 ie2
]
where
ppr_export child gre ie = nest 3 (hang (quotes (ppr ie) <+> text "exports" <+>
quotes (ppr_name child))
2 (pprNameProvenance gre))
-- DuplicateRecordFields means that nameOccName might be a mangled
-- $sel-prefixed thing, in which case show the correct OccName alone
-- (but otherwise show the Name so it will have a module qualifier)
ppr_name (FieldGreName fl) | flIsOverloaded fl = ppr fl
| otherwise = ppr (flSelector fl)
ppr_name (NormalGreName name) = ppr name
diagnosticReason = \case
TcRnUnknownMessage m
-> diagnosticReason m
TcLevityPolyInType{}
-> ErrorWithoutFlag
TcRnMessageWithInfo _ msg_with_info
-> case msg_with_info of
TcRnMessageDetailed _ m -> diagnosticReason m
TcRnImplicitLift{}
-> WarningWithFlag Opt_WarnImplicitLift
TcRnUnusedPatternBinds{}
-> WarningWithFlag Opt_WarnUnusedPatternBinds
TcRnDodgyImports{}
-> WarningWithFlag Opt_WarnDodgyImports
TcRnDodgyExports{}
-> WarningWithFlag Opt_WarnDodgyExports
TcRnMissingImportList{}
-> WarningWithFlag Opt_WarnMissingImportList
TcRnUnsafeDueToPlugin{}
-> WarningWithoutFlag
TcRnModMissingRealSrcSpan{}
-> ErrorWithoutFlag
TcRnIdNotExportedFromModuleSig{}
-> ErrorWithoutFlag
TcRnIdNotExportedFromLocalSig{}
-> ErrorWithoutFlag
TcRnShadowedName{}
-> WarningWithFlag Opt_WarnNameShadowing
TcRnDuplicateWarningDecls{}
-> ErrorWithoutFlag
TcRnSimplifierTooManyIterations{}
-> ErrorWithoutFlag
TcRnIllegalPatSynDecl{}
-> ErrorWithoutFlag
TcRnLinearPatSyn{}
-> ErrorWithoutFlag
TcRnEmptyRecordUpdate
-> ErrorWithoutFlag
TcRnIllegalFieldPunning{}
-> ErrorWithoutFlag
TcRnIllegalWildcardsInRecord{}
-> ErrorWithoutFlag
TcRnDuplicateFieldName{}
-> ErrorWithoutFlag
TcRnIllegalViewPattern{}
-> ErrorWithoutFlag
TcRnCharLiteralOutOfRange{}
-> ErrorWithoutFlag
TcRnIllegalWildcardsInConstructor{}
-> ErrorWithoutFlag
TcRnIgnoringAnnotations{}
-> WarningWithoutFlag
TcRnAnnotationInSafeHaskell
-> ErrorWithoutFlag
TcRnInvalidTypeApplication{}
-> ErrorWithoutFlag
TcRnTagToEnumMissingValArg
-> ErrorWithoutFlag
TcRnTagToEnumUnspecifiedResTy{}
-> ErrorWithoutFlag
TcRnTagToEnumResTyNotAnEnum{}
-> ErrorWithoutFlag
TcRnArrowIfThenElsePredDependsOnResultTy
-> ErrorWithoutFlag
TcRnArrowCommandExpected{}
-> ErrorWithoutFlag
TcRnIllegalHsBootFileDecl
-> ErrorWithoutFlag
TcRnRecursivePatternSynonym{}
-> ErrorWithoutFlag
TcRnPartialTypeSigTyVarMismatch{}
-> ErrorWithoutFlag
TcRnPartialTypeSigBadQuantifier{}
-> ErrorWithoutFlag
TcRnPolymorphicBinderMissingSig{}
-> WarningWithFlag Opt_WarnMissingLocalSignatures
TcRnOverloadedSig{}
-> ErrorWithoutFlag
TcRnTupleConstraintInst{}
-> ErrorWithoutFlag
TcRnAbstractClassInst{}
-> ErrorWithoutFlag
TcRnNoClassInstHead{}
-> ErrorWithoutFlag
TcRnUserTypeError{}
-> ErrorWithoutFlag
TcRnConstraintInKind{}
-> ErrorWithoutFlag
TcRnUnboxedTupleTypeFuncArg{}
-> ErrorWithoutFlag
TcRnLinearFuncInKind{}
-> ErrorWithoutFlag
TcRnForAllEscapeError{}
-> ErrorWithoutFlag
TcRnVDQInTermType{}
-> ErrorWithoutFlag
TcRnIllegalEqualConstraints{}
-> ErrorWithoutFlag
TcRnBadQuantPredHead{}
-> ErrorWithoutFlag
TcRnIllegalTupleConstraint{}
-> ErrorWithoutFlag
TcRnNonTypeVarArgInConstraint{}
-> ErrorWithoutFlag
TcRnIllegalImplicitParam{}
-> ErrorWithoutFlag
TcRnIllegalConstraintSynonymOfKind{}
-> ErrorWithoutFlag
TcRnIllegalClassInst{}
-> ErrorWithoutFlag
TcRnOversaturatedVisibleKindArg{}
-> ErrorWithoutFlag
TcRnBadAssociatedType{}
-> ErrorWithoutFlag
TcRnForAllRankErr{}
-> ErrorWithoutFlag
TcRnMonomorphicBindings{}
-> WarningWithFlag Opt_WarnMonomorphism
TcRnOrphanInstance{}
-> WarningWithFlag Opt_WarnOrphans
TcRnFunDepConflict{}
-> ErrorWithoutFlag
TcRnDupInstanceDecls{}
-> ErrorWithoutFlag
TcRnConflictingFamInstDecls{}
-> ErrorWithoutFlag
TcRnFamInstNotInjective{}
-> ErrorWithoutFlag
TcRnBangOnUnliftedType{}
-> WarningWithFlag Opt_WarnRedundantStrictnessFlags
TcRnMultipleDefaultDeclarations{}
-> ErrorWithoutFlag
TcRnBadDefaultType{}
-> ErrorWithoutFlag
TcRnPatSynBundledWithNonDataCon{}
-> ErrorWithoutFlag
TcRnPatSynBundledWithWrongType{}
-> ErrorWithoutFlag
TcRnDupeModuleExport{}
-> WarningWithFlag Opt_WarnDuplicateExports
TcRnExportedModNotImported{}
-> ErrorWithoutFlag
TcRnNullExportedModule{}
-> WarningWithFlag Opt_WarnDodgyExports
TcRnMissingExportList{}
-> WarningWithFlag Opt_WarnMissingExportList
TcRnExportHiddenComponents{}
-> ErrorWithoutFlag
TcRnDuplicateExport{}
-> WarningWithFlag Opt_WarnDuplicateExports
TcRnExportedParentChildMismatch{}
-> ErrorWithoutFlag
TcRnConflictingExports{}
-> ErrorWithoutFlag
diagnosticHints = \case
TcRnUnknownMessage m
-> diagnosticHints m
TcLevityPolyInType{}
-> noHints
TcRnMessageWithInfo _ msg_with_info
-> case msg_with_info of
TcRnMessageDetailed _ m -> diagnosticHints m
TcRnImplicitLift{}
-> noHints
TcRnUnusedPatternBinds{}
-> noHints
TcRnDodgyImports{}
-> noHints
TcRnDodgyExports{}
-> noHints
TcRnMissingImportList{}
-> noHints
TcRnUnsafeDueToPlugin{}
-> noHints
TcRnModMissingRealSrcSpan{}
-> noHints
TcRnIdNotExportedFromModuleSig name mod
-> [SuggestAddToHSigExportList name $ Just mod]
TcRnIdNotExportedFromLocalSig name
-> [SuggestAddToHSigExportList name Nothing]
TcRnShadowedName{}
-> noHints
TcRnDuplicateWarningDecls{}
-> noHints
TcRnSimplifierTooManyIterations{}
-> [SuggestIncreaseSimplifierIterations]
TcRnIllegalPatSynDecl{}
-> noHints
TcRnLinearPatSyn{}
-> noHints
TcRnEmptyRecordUpdate{}
-> noHints
TcRnIllegalFieldPunning{}
-> [suggestExtension LangExt.NamedFieldPuns]
TcRnIllegalWildcardsInRecord{}
-> [suggestExtension LangExt.RecordWildCards]
TcRnDuplicateFieldName{}
-> noHints
TcRnIllegalViewPattern{}
-> [suggestExtension LangExt.ViewPatterns]
TcRnCharLiteralOutOfRange{}
-> noHints
TcRnIllegalWildcardsInConstructor{}
-> noHints
TcRnIgnoringAnnotations{}
-> noHints
TcRnAnnotationInSafeHaskell
-> noHints
TcRnInvalidTypeApplication{}
-> noHints
TcRnTagToEnumMissingValArg
-> noHints
TcRnTagToEnumUnspecifiedResTy{}
-> noHints
TcRnTagToEnumResTyNotAnEnum{}
-> noHints
TcRnArrowIfThenElsePredDependsOnResultTy
-> noHints
TcRnArrowCommandExpected{}
-> noHints
TcRnIllegalHsBootFileDecl
-> noHints
TcRnRecursivePatternSynonym{}
-> noHints
TcRnPartialTypeSigTyVarMismatch{}
-> noHints
TcRnPartialTypeSigBadQuantifier{}
-> noHints
TcRnPolymorphicBinderMissingSig{}
-> noHints
TcRnOverloadedSig{}
-> noHints
TcRnTupleConstraintInst{}
-> noHints
TcRnAbstractClassInst{}
-> noHints
TcRnNoClassInstHead{}
-> noHints
TcRnUserTypeError{}
-> noHints
TcRnConstraintInKind{}
-> noHints
TcRnUnboxedTupleTypeFuncArg{}
-> [suggestExtension LangExt.UnboxedTuples]
TcRnLinearFuncInKind{}
-> noHints
TcRnForAllEscapeError{}
-> noHints
TcRnVDQInTermType{}
-> noHints
TcRnIllegalEqualConstraints{}
-> [suggestAnyExtension [LangExt.GADTs, LangExt.TypeFamilies]]
TcRnBadQuantPredHead{}
-> noHints
TcRnIllegalTupleConstraint{}
-> [suggestExtension LangExt.ConstraintKinds]
TcRnNonTypeVarArgInConstraint{}
-> [suggestExtension LangExt.FlexibleContexts]
TcRnIllegalImplicitParam{}
-> noHints
TcRnIllegalConstraintSynonymOfKind{}
-> [suggestExtension LangExt.ConstraintKinds]
TcRnIllegalClassInst{}
-> noHints
TcRnOversaturatedVisibleKindArg{}
-> noHints
TcRnBadAssociatedType{}
-> noHints
TcRnForAllRankErr rank _
-> case rank of
LimitedRank{} -> [suggestExtension LangExt.RankNTypes]
MonoTypeRankZero -> [suggestExtension LangExt.RankNTypes]
MonoTypeTyConArg -> [suggestExtension LangExt.ImpredicativeTypes]
MonoTypeSynArg -> [suggestExtension LangExt.LiberalTypeSynonyms]
MonoTypeConstraint -> [suggestExtension LangExt.QuantifiedConstraints]
_ -> noHints
TcRnMonomorphicBindings bindings
-> case bindings of
[] -> noHints
(x:xs) -> [SuggestAddTypeSignatures $ NamedBindings (x NE.:| xs)]
TcRnOrphanInstance{}
-> [SuggestFixOrphanInstance]
TcRnFunDepConflict{}
-> noHints
TcRnDupInstanceDecls{}
-> noHints
TcRnConflictingFamInstDecls{}
-> noHints
TcRnFamInstNotInjective rea _ _
-> case rea of
InjErrRhsBareTyVar{} -> noHints
InjErrRhsCannotBeATypeFam -> noHints
InjErrRhsOverlap -> noHints
InjErrCannotInferFromRhs _ _ suggestUndInst
| YesSuggestUndecidableInstaces <- suggestUndInst
-> [suggestExtension LangExt.UndecidableInstances]
| otherwise
-> noHints
TcRnBangOnUnliftedType{}
-> noHints
TcRnMultipleDefaultDeclarations{}
-> noHints
TcRnBadDefaultType{}
-> noHints
TcRnPatSynBundledWithNonDataCon{}
-> noHints
TcRnPatSynBundledWithWrongType{}
-> noHints
TcRnDupeModuleExport{}
-> noHints
TcRnExportedModNotImported{}
-> noHints
TcRnNullExportedModule{}
-> noHints
TcRnMissingExportList{}
-> noHints
TcRnExportHiddenComponents{}
-> noHints
TcRnDuplicateExport{}
-> noHints
TcRnExportedParentChildMismatch{}
-> noHints
TcRnConflictingExports{}
-> noHints
messageWithInfoDiagnosticMessage :: UnitState
-> ErrInfo
-> DecoratedSDoc
-> DecoratedSDoc
messageWithInfoDiagnosticMessage unit_state ErrInfo{..} important =
let err_info' = map (pprWithUnitState unit_state) [errInfoContext, errInfoSupplementary]
in (mapDecoratedSDoc (pprWithUnitState unit_state) important) `unionDecoratedSDoc`
mkDecorated err_info'
dodgy_msg :: (Outputable a, Outputable b) => SDoc -> a -> b -> SDoc
dodgy_msg kind tc ie
= sep [ text "The" <+> kind <+> text "item"
<+> quotes (ppr ie)
<+> text "suggests that",
quotes (ppr tc) <+> text "has (in-scope) constructors or class methods,",
text "but it has none" ]
dodgy_msg_insert :: forall p . IdP (GhcPass p) -> IE (GhcPass p)
dodgy_msg_insert tc = IEThingAll noAnn ii
where
ii :: LIEWrappedName (IdP (GhcPass p))
ii = noLocA (IEName $ noLocA tc)
formatLevPolyErr :: Type -- representation-polymorphic type
-> SDoc
formatLevPolyErr ty
= hang (text "A representation-polymorphic type is not allowed here:")
2 (vcat [ text "Type:" <+> pprWithTYPE tidy_ty
, text "Kind:" <+> pprWithTYPE tidy_ki ])
where
(tidy_env, tidy_ty) = tidyOpenType emptyTidyEnv ty
tidy_ki = tidyType tidy_env (tcTypeKind ty)
pprLevityPolyInType :: Type -> LevityCheckProvenance -> SDoc
pprLevityPolyInType ty prov =
let extra = case prov of
LevityCheckInBinder v
-> text "In the type of binder" <+> quotes (ppr v)
LevityCheckInVarType
-> text "When trying to create a variable of type:" <+> ppr ty
LevityCheckInWildcardPattern
-> text "In a wildcard pattern"
LevityCheckInUnboxedTuplePattern p
-> text "In the type of an element of an unboxed tuple pattern:" $$ ppr p
LevityCheckPatSynSig
-> empty
LevityCheckCmdStmt
-> empty -- I (Richard E, Dec '16) have no idea what to say here
LevityCheckMkCmdEnv id_var
-> text "In the result of the function" <+> quotes (ppr id_var)
LevityCheckDoCmd do_block
-> text "In the do-command:" <+> ppr do_block
LevityCheckDesugaringCmd cmd
-> text "When desugaring the command:" <+> ppr cmd
LevityCheckInCmd body
-> text "In the command:" <+> ppr body
LevityCheckInFunUse using
-> text "In the result of a" <+> quotes (text "using") <+> text "function:" <+> ppr using
LevityCheckInValidDataCon
-> empty
LevityCheckInValidClass
-> empty
in formatLevPolyErr ty $$ extra
pprRecordFieldPart :: RecordFieldPart -> SDoc
pprRecordFieldPart = \case
RecordFieldConstructor{} -> text "construction"
RecordFieldPattern{} -> text "pattern"
RecordFieldUpdate -> text "update"
pprBindings :: [Name] -> SDoc
pprBindings = pprWithCommas (quotes . ppr)
injectivityErrorHerald :: SDoc
injectivityErrorHerald =
text "Type family equation violates the family's injectivity annotation."
formatExportItemError :: SDoc -> String -> SDoc
formatExportItemError exportedThing reason =
hsep [ text "The export item"
, quotes exportedThing
, text reason ]