{-# LANGUAGE DeriveGeneric #-} {-# LANGUAGE FlexibleContexts #-} {-# LANGUAGE FlexibleInstances #-} {-# LANGUAGE GADTs #-} {-# LANGUAGE KindSignatures #-} {-# LANGUAGE DataKinds #-} {-# LANGUAGE UndecidableInstances #-} {-# LANGUAGE TypeApplications #-} module GHC.Tc.Errors.Types ( -- * Main types TcRnMessage(..) , TcRnMessageOpts(..) , mkTcRnUnknownMessage , TcRnMessageDetailed(..) , TypeDataForbids(..) , ErrInfo(..) , FixedRuntimeRepProvenance(..) , pprFixedRuntimeRepProvenance , ShadowedNameProvenance(..) , RecordFieldPart(..) , IllegalNewtypeReason(..) , BadRecordUpdateReason(..) , InjectivityErrReason(..) , HasKinds(..) , hasKinds , SuggestUndecidableInstances(..) , suggestUndecidableInstances , SuggestUnliftedTypes(..) , DataSort(..), ppDataSort , AllowedDataResKind(..) , NotClosedReason(..) , SuggestPartialTypeSignatures(..) , suggestPartialTypeSignatures , DeriveInstanceErrReason(..) , UsingGeneralizedNewtypeDeriving(..) , usingGeneralizedNewtypeDeriving , DeriveAnyClassEnabled(..) , deriveAnyClassEnabled , DeriveInstanceBadConstructor(..) , HasWildcard(..) , hasWildcard , BadAnonWildcardContext(..) , SoleExtraConstraintWildcardAllowed(..) , DeriveGenericsErrReason(..) , HasAssociatedDataFamInsts(..) , hasAssociatedDataFamInsts , AssociatedTyLastVarInKind(..) , associatedTyLastVarInKind , AssociatedTyNotParamOverLastTyVar(..) , associatedTyNotParamOverLastTyVar , MissingSignature(..) , Exported(..) , HsDocContext(..) , FixedRuntimeRepErrorInfo(..) , TcRnNoDerivStratSpecifiedInfo(..) , ErrorItem(..), errorItemOrigin, errorItemEqRel, errorItemPred, errorItemCtLoc , SolverReport(..), SolverReportSupplementary(..) , SolverReportWithCtxt(..) , SolverReportErrCtxt(..) , getUserGivens, discardProvCtxtGivens , TcSolverReportMsg(..) , CannotUnifyVariableReason(..) , MismatchMsg(..) , MismatchEA(..) , mkPlainMismatchMsg, mkBasicMismatchMsg , WhenMatching(..) , ExpectedActualInfo(..) , TyVarInfo(..), SameOccInfo(..) , AmbiguityInfo(..) , CND_Extra(..) , FitsMbSuppressed(..) , ValidHoleFits(..), noValidHoleFits , HoleFitDispConfig(..) , RelevantBindings(..), pprRelevantBindings , PromotionErr(..), pprPECategory, peCategory , TermLevelUseErr(..), teCategory , NotInScopeError(..), mkTcRnNotInScope , ImportError(..) , HoleError(..) , CoercibleMsg(..) , PotentialInstances(..) , UnsupportedCallConvention(..) , ExpectedBackends , ArgOrResult(..) , MatchArgsContext(..), MatchArgBadMatches(..) , PragmaWarningInfo(..) , EmptyStatementGroupErrReason(..) , UnexpectedStatement(..) , DeclSort(..) , NonStandardGuards(..) , RuleLhsErrReason(..) , HsigShapeMismatchReason(..) , WrongThingSort(..) , StageCheckReason(..) , UninferrableTyVarCtx(..) , PatSynInvalidRhsReason(..) , BadFieldAnnotationReason(..) , SuperclassCycle(..) , SuperclassCycleDetail(..) , RoleValidationFailedReason(..) , DisabledClassExtension(..) , TyFamsDisabledReason(..) , TypeApplication(..) , HsTypeOrSigType(..) , HsTyVarBndrExistentialFlag(..) , TySynCycleTyCons , BadImportKind(..) , DodgyImportsReason (..) , ImportLookupReason (..) , UnusedImportReason (..) , UnusedImportName (..) , NestedForallsContextsIn(..) , UnusedNameProv(..) , NonCanonicalDefinition(..) , NonCanonical_Monoid(..) , NonCanonical_Monad(..) , TypeSyntax(..) , typeSyntaxExtension -- * Errors for hs-boot and signature files , BadBootDecls(..) , MissingBootThing(..), missingBootThing , BootMismatch(..) , BootMismatchWhat(..) , BootTyConMismatch(..) , BootAxiomBranchMismatch(..) , BootClassMismatch(..) , BootMethodMismatch(..) , BootATMismatch(..) , BootDataMismatch(..) , BootDataConMismatch(..) , SynAbstractDataError(..) , BootListMismatch(..), BootListMismatches -- * Class and family instance errors , IllegalInstanceReason(..) , IllegalClassInstanceReason(..) , IllegalInstanceHeadReason(..) , IllegalHasFieldInstance(..) , CoverageProblem(..), FailedCoverageCondition(..) , IllegalFamilyInstanceReason(..) , InvalidFamInstQTv(..), InvalidFamInstQTvReason(..) , InvalidAssoc(..), InvalidAssocInstance(..) , InvalidAssocDefault(..), AssocDefaultBadArgs(..) -- * Template Haskell errors , THError(..), THSyntaxError(..), THNameError(..) , THReifyError(..), TypedTHError(..) , SpliceFailReason(..), RunSpliceFailReason(..) , AddTopDeclsError(..) , ConversionFailReason(..) , UnrepresentableTypeDescr(..) , LookupTHInstNameErrReason(..) , SplicePhase(..) , THDeclDescriptor(..) , ThingBeingConverted(..) , IllegalDecls(..) -- * Zonker errors , ZonkerMessage(..) -- FFI Errors , IllegalForeignTypeReason(..) , TypeCannotBeMarshaledReason(..) ) where import GHC.Prelude import GHC.Hs import GHC.Tc.Errors.Types.PromotionErr import GHC.Tc.Errors.Hole.FitTypes (HoleFit) import GHC.Tc.Types.Constraint import GHC.Tc.Types.Evidence (EvBindsVar) import GHC.Tc.Types.Origin ( CtOrigin (ProvCtxtOrigin), SkolemInfoAnon (SigSkol) , UserTypeCtxt (PatSynCtxt), TyVarBndrs, TypedThing , FixedRuntimeRepOrigin(..), InstanceWhat ) import GHC.Tc.Types.CtLoc( CtLoc, ctLocOrigin, SubGoalDepth ) import GHC.Tc.Types.Rank (Rank) import GHC.Tc.Types.TH import GHC.Tc.Types.BasicTypes import GHC.Tc.Utils.TcType (TcType, TcSigmaType, TcPredType, PatersonCondFailure, PatersonCondFailureContext) import GHC.Types.Basic import GHC.Types.Error import GHC.Types.Avail import GHC.Types.Hint (UntickedPromotedThing(..), AssumedDerivingStrategy(..)) import GHC.Types.ForeignCall (CLabelString) import GHC.Types.Id.Info ( RecSelParent(..) ) import GHC.Types.Name (NamedThing(..), Name, OccName, getSrcLoc, getSrcSpan) import qualified GHC.Types.Name.Occurrence as OccName import GHC.Types.Name.Reader import GHC.Types.Name.Env (NameEnv) import GHC.Types.SourceFile (HsBootOrSig(..)) import GHC.Types.SrcLoc import GHC.Types.TyThing (TyThing) import GHC.Types.Var (Id, TyCoVar, TyVar, TcTyVar, CoVar, Specificity) import GHC.Types.Var.Env (TidyEnv) import GHC.Types.Var.Set (TyVarSet, VarSet) import GHC.Types.DefaultEnv (ClassDefaults) import GHC.Unit.Types (Module) import GHC.Unit.State (UnitState) import GHC.Unit.Module.Warnings (WarningCategory, WarningTxt) import GHC.Unit.Module.ModIface (ModIface) import GHC.Core.Class (Class, ClassMinimalDef, ClassOpItem, ClassATItem) import GHC.Core.Coercion (Coercion) import GHC.Core.Coercion.Axiom (CoAxBranch) import GHC.Core.ConLike (ConLike) import GHC.Core.DataCon (DataCon, FieldLabel) import GHC.Core.FamInstEnv (FamInst) import GHC.Core.InstEnv (LookupInstanceErrReason, ClsInst, DFunId) import GHC.Core.PatSyn (PatSyn) import GHC.Core.Predicate (EqRel, predTypeEqRel) import GHC.Core.TyCon (TyCon, Role, FamTyConFlav, AlgTyConRhs) import GHC.Core.Type (Kind, Type, ThetaType, PredType, ErrorMsgType, ForAllTyFlag) import GHC.Driver.Backend (Backend) import GHC.Utils.Outputable import GHC.Utils.Misc (filterOut) import qualified GHC.LanguageExtensions as LangExt import GHC.Data.FastString (FastString) import GHC.Data.Pair import GHC.Exception.Type (SomeException) import Language.Haskell.Syntax.Basic (FieldLabelString(..)) import qualified Data.List.NonEmpty as NE import Data.Typeable (Typeable) import qualified GHC.Internal.TH.Syntax as TH import Data.Map.Strict (Map) import GHC.Generics ( Generic ) import GHC.Iface.Errors.Types data TcRnMessageOpts = TcRnMessageOpts { TcRnMessageOpts -> Bool tcOptsShowContext :: !Bool -- ^ Whether we show the error context or not , TcRnMessageOpts -> IfaceMessageOpts tcOptsIfaceOpts :: !IfaceMessageOpts } {- Note [Migrating TcM Messages] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ As part of #18516, we are slowly migrating the diagnostic messages emitted and reported in the TcM from SDoc to TcRnMessage. Historically, GHC emitted some diagnostics in 3 pieces, i.e. there were lots of error-reporting functions that accepted 3 SDocs an input: one for the important part of the message, one for the context and one for any supplementary information. Consider the following: • Couldn't match expected type ‘Int’ with actual type ‘Char’ • In the expression: x4 In a stmt of a 'do' block: return (x2, x4) In the expression: Under the hood, the reporting functions in Tc.Utils.Monad were emitting "Couldn't match" as the important part, "In the expression" as the context and "In a stmt..In the expression" as the supplementary, with the context and supplementary usually smashed together so that the final message would be composed only by two SDoc (which would then be bulleted like in the example). In order for us to smooth out the migration to the new diagnostic infrastructure, we introduce the 'ErrInfo' and 'TcRnMessageDetailed' types, which serve exactly the purpose of bridging the two worlds together without breaking the external API or the existing format of messages reported by GHC. Using 'ErrInfo' and 'TcRnMessageDetailed' also allows us to move away from the SDoc-ridden diagnostic API inside Tc.Utils.Monad, enabling further refactorings. In the future, once the conversion will be complete and we will successfully eradicate any use of SDoc in the diagnostic reporting of GHC, we can surely revisit the usage and existence of these two types, which for now remain a "necessary evil". -} -- The majority of TcRn messages come with extra context about the error, -- and this newtype captures it. See Note [Migrating TcM Messages]. data ErrInfo = ErrInfo { ErrInfo -> SDoc errInfoContext :: !SDoc -- ^ Extra context associated to the error. , ErrInfo -> SDoc errInfoSupplementary :: !SDoc -- ^ Extra supplementary info associated to the error. } -- | 'TcRnMessageDetailed' is an \"internal\" type (used only inside -- 'GHC.Tc.Utils.Monad' that wraps a 'TcRnMessage' while also providing -- any extra info needed to correctly pretty-print this diagnostic later on. data TcRnMessageDetailed = TcRnMessageDetailed !ErrInfo -- ^ Extra info associated with the message !TcRnMessage deriving (forall x. TcRnMessageDetailed -> Rep TcRnMessageDetailed x) -> (forall x. Rep TcRnMessageDetailed x -> TcRnMessageDetailed) -> Generic TcRnMessageDetailed forall x. Rep TcRnMessageDetailed x -> TcRnMessageDetailed forall x. TcRnMessageDetailed -> Rep TcRnMessageDetailed x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TcRnMessageDetailed -> Rep TcRnMessageDetailed x from :: forall x. TcRnMessageDetailed -> Rep TcRnMessageDetailed x $cto :: forall x. Rep TcRnMessageDetailed x -> TcRnMessageDetailed to :: forall x. Rep TcRnMessageDetailed x -> TcRnMessageDetailed Generic mkTcRnUnknownMessage :: (Diagnostic a, Typeable a, DiagnosticOpts a ~ NoDiagnosticOpts) => a -> TcRnMessage mkTcRnUnknownMessage :: forall a. (Diagnostic a, Typeable a, DiagnosticOpts a ~ NoDiagnosticOpts) => a -> TcRnMessage mkTcRnUnknownMessage a diag = UnknownDiagnostic (DiagnosticOpts TcRnMessage) -> TcRnMessage TcRnUnknownMessage (a -> UnknownDiagnostic (DiagnosticOpts TcRnMessage) forall a b. (Diagnostic a, Typeable a, DiagnosticOpts a ~ NoDiagnosticOpts) => a -> UnknownDiagnostic b mkSimpleUnknownDiagnostic a diag) -- Please don't use this function inside the GHC codebase; -- it mainly exists for users of the GHC API, such as plugins. -- -- If you need to emit a new error message in the typechecker, -- you should add a new constructor to 'TcRnMessage' instead. -- | An error which might arise during typechecking/renaming. data TcRnMessage where {-| Simply wraps an unknown 'Diagnostic' message @a@. It can be used by plugins to provide custom diagnostic messages originated during typechecking/renaming. -} TcRnUnknownMessage :: (UnknownDiagnostic (DiagnosticOpts TcRnMessage)) -> TcRnMessage {-| Wrap an 'IfaceMessage' to a 'TcRnMessage' for when we attempt to load interface files during typechecking but encounter an error. -} TcRnInterfaceError :: !IfaceMessage -> TcRnMessage {-| TcRnMessageWithInfo is a constructor which is used when extra information is needed to be provided in order to qualify a diagnostic and where it was originated (and why). It carries an extra 'UnitState' which can be used to pretty-print some names and it wraps a 'TcRnMessageDetailed', which includes any extra context associated with this diagnostic. -} TcRnMessageWithInfo :: !UnitState -- ^ The 'UnitState' will allow us to pretty-print -- some diagnostics with more detail. -> !TcRnMessageDetailed -> TcRnMessage {-| TcRnWithHsDocContext annotates an error message with the context in which it originated. -} TcRnWithHsDocContext :: !HsDocContext -> !TcRnMessage -> TcRnMessage {-| TcRnSolverReport is the constructor used to report unsolved constraints after constraint solving, as well as other errors such as hole fit errors. See the documentation of t'TcSolverReportMsg' datatype for an overview of the different errors. -} TcRnSolverReport :: SolverReportWithCtxt -> DiagnosticReason -> TcRnMessage {-| TcRnSolverDepthError is an error that occurs when the constraint solver exceeds the maximum recursion depth. Example: class C a where { meth :: a } instance Cls [a] => Cls a where { meth = head . meth } t :: () t = meth Test cases: T7788 T8550 T9554 T15316A T17267{∅,a,b,c,e} T17458 ContextStack1 T22924b TcCoercibleFail -} TcRnSolverDepthError :: !Type -> !SubGoalDepth -> TcRnMessage {-| TcRnRedundantConstraints is a warning that is emitted when a binding has a user-written type signature which contains superfluous constraints. Example: f :: (Eq a, Ord a) => a -> a -> a f x y = (x < y) || x == y -- `Eq a` is superfluous: the `Ord a` constraint suffices. Test cases: T9939, T10632, T18036a, T20602, PluralS, T19296. -} TcRnRedundantConstraints :: [Id] -> (SkolemInfoAnon, Bool) -- ^ The contextual skolem info. -- The boolean controls whether we -- want to show it in the user message. -- (Nice to keep track of the info in either case, -- for other users of the GHC API.) -> TcRnMessage {-| TcRnInaccessibleCode is a warning that is emitted when the RHS of a pattern match is inaccessible, because the constraint solver has detected a contradiction. Example: data B a where { MkTrue :: B True; MkFalse :: B False } foo :: B False -> Bool foo MkFalse = False foo MkTrue = True -- Inaccessible: requires True ~ False Test cases: T7293, T7294, T15558, T17646, T18572, T18610, tcfail167. -} TcRnInaccessibleCode :: Implication -- ^ The implication containing a contradiction. -> SolverReportWithCtxt -- ^ The contradiction. -> TcRnMessage {-| TcRnInaccessibleCoAxBranch is a warning that is emitted when a closed type family has a branch which is inaccessible due to a more general, prior branch. Example: type family F a where F a = Int F Bool = Bool Test cases: T9085, T14066a, T9085, T6018, tc265, -} TcRnInaccessibleCoAxBranch :: TyCon -- ^ The type family's constructor -> CoAxBranch -- ^ The inaccessible branch -> TcRnMessage {-| A type which was expected to have a fixed runtime representation does not have a fixed runtime representation. Example: data D (a :: TYPE r) = MkD a Test cases: T11724, T18534, RepPolyPatSynArg, RepPolyPatSynUnliftedNewtype, RepPolyPatSynRes, T20423 -} TcRnTypeDoesNotHaveFixedRuntimeRep :: !Type -> !FixedRuntimeRepProvenance -> !ErrInfo -- Extra info accumulated in the TcM monad -> TcRnMessage {-| TcRnImplicitLift is a warning (controlled with -Wimplicit-lift) that occurs when a Template Haskell quote implicitly uses 'lift'. Example: warning1 :: Lift t => t -> Q Exp warning1 x = [| x |] Test cases: th/T17804 -} TcRnImplicitLift :: Name -> !ErrInfo -> TcRnMessage {-| TcRnUnusedPatternBinds is a warning (controlled with -Wunused-pattern-binds) that occurs if a pattern binding binds no variables at all, unless it is a lone wild-card pattern, or a banged pattern. Example: Just _ = rhs3 -- Warning: unused pattern binding (_, _) = rhs4 -- Warning: unused pattern binding _ = rhs3 -- No warning: lone wild-card pattern !() = rhs4 -- No warning: banged pattern; behaves like seq Test cases: rename/{T13646,T17c,T17e,T7085} -} TcRnUnusedPatternBinds :: HsBind GhcRn -> TcRnMessage {-| TcRnUnusedQuantifiedTypeVar is a warning that occurs if there are unused quantified type variables. Examples: f :: forall a. Int -> Char Test cases: rename/should_compile/ExplicitForAllRules1 rename/should_compile/T5331 -} TcRnUnusedQuantifiedTypeVar :: HsDocContext -> HsTyVarBndrExistentialFlag -- ^ tyVar binder. -> TcRnMessage {-| TcRnDodgyImports is a group of warnings (controlled with -Wdodgy-imports). See 'DodgyImportsReason' for the different warnings. -} TcRnDodgyImports :: !DodgyImportsReason -> TcRnMessage {-| TcRnDodgyExports is a warning (controlled by -Wdodgy-exports) that occurs when an export of the form 'T(..)' for a type constructor 'T' does not actually export anything beside 'T' itself. Example: module Foo ( T(..) -- Warning: T is a type synonym , A(..) -- Warning: A is a type family , C(..) -- Warning: C is a data family ) where type T = Int type family A :: * -> * data family C :: * -> * Test cases: warnings/should_compile/DodgyExports01 -} TcRnDodgyExports :: GlobalRdrElt -> TcRnMessage {-| TcRnMissingImportList is a warning (controlled by -Wmissing-import-lists) that occurs when an import declaration does not explicitly list all the names brought into scope. Test cases: rename/should_compile/T4489 -} TcRnMissingImportList :: IE GhcPs -> TcRnMessage {-| When a module marked trustworthy or unsafe (using -XTrustworthy or -XUnsafe) is compiled with a plugin, the TcRnUnsafeDueToPlugin warning (controlled by -Wunsafe) is used as the reason the module was inferred to be unsafe. This warning is not raised if the -fplugin-trustworthy flag is passed. Test cases: plugins/T19926 -} TcRnUnsafeDueToPlugin :: TcRnMessage {-| TcRnModMissingRealSrcSpan is an error that occurs when compiling a module that lacks an associated 'RealSrcSpan'. Test cases: None -} TcRnModMissingRealSrcSpan :: Module -> TcRnMessage {-| TcRnIdNotExportedFromModuleSig is an error pertaining to backpack that occurs when an identifier required by a signature is not exported by the module or signature that is being used as a substitution for that signature. Example(s): None Test cases: backpack/should_fail/bkpfail36 -} TcRnIdNotExportedFromModuleSig :: Name -> Module -> TcRnMessage {-| TcRnIdNotExportedFromLocalSig is an error pertaining to backpack that occurs when an identifier which is necessary for implementing a module signature is not exported from that signature. Example(s): None Test cases: backpack/should_fail/bkpfail30 backpack/should_fail/bkpfail31 backpack/should_fail/bkpfail34 -} TcRnIdNotExportedFromLocalSig :: Name -> TcRnMessage {-| TcRnShadowedName is a warning (controlled by -Wname-shadowing) that occurs whenever an inner-scope value has the same name as an outer-scope value, i.e. the inner value shadows the outer one. This can catch typographical errors that turn into hard-to-find bugs. The warning is suppressed for names beginning with an underscore. Examples(s): f = ... let f = id in ... f ... -- NOT OK, 'f' is shadowed f x = do { _ignore <- this; _ignore <- that; return (the other) } -- suppressed via underscore Test cases: typecheck/should_compile/T10971a rename/should_compile/rn039 rename/should_compile/rn064 rename/should_compile/T1972 rename/should_fail/T2723 rename/should_compile/T3262 driver/werror rename/should_fail/T22478d typecheck/should_fail/TyAppPat_ScopedTyVarConflict -} TcRnShadowedName :: OccName -> ShadowedNameProvenance -> TcRnMessage {-| TcRnInvalidWarningCategory is an error that occurs when a warning is declared with a category name that is not the special category "deprecations", and either does not begin with the prefix "x-" indicating a user-defined category, or contains characters not valid in category names. See Note [Warning categories] in GHC.Unit.Module.Warnings Examples(s): module M {-# WARNING in "invalid" "Oops" #-} where {-# WARNING in "x- spaces not allowed" foo "Oops" #-} Test cases: warnings/should_fail/WarningCategoryInvalid -} TcRnInvalidWarningCategory :: !WarningCategory -> TcRnMessage {-| TcRnDuplicateWarningDecls is an error that occurs whenever a warning is declared twice. Examples(s): {-# DEPRECATED foo "Don't use me" #-} {-# DEPRECATED foo "Don't use me" #-} foo :: Int foo = 2 Test cases: rename/should_fail/rnfail058 -} TcRnDuplicateWarningDecls :: !(LocatedN RdrName) -> !RdrName -> TcRnMessage {-| TcRnSimplifierTooManyIterations is an error that occurs whenever the constraint solver in the simplifier hits the iterations' limit. Examples(s): None. Test cases: None. -} TcRnSimplifierTooManyIterations :: Cts -> !IntWithInf -- ^ The limit. -> WantedConstraints -> TcRnMessage {-| TcRnIllegalPatSynDecl is an error that occurs whenever there is an illegal pattern synonym declaration. Examples(s): varWithLocalPatSyn x = case x of P -> () where pattern P = () -- not valid, it can't be local, it must be defined at top-level. Test cases: patsyn/should_fail/local -} TcRnIllegalPatSynDecl :: !(LIdP GhcPs) -> TcRnMessage {-| TcRnLinearPatSyn is an error that occurs whenever a pattern synonym signature uses a field that is not unrestricted. Example(s): None Test cases: linear/should_fail/LinearPatSyn2 -} TcRnLinearPatSyn :: !Type -> TcRnMessage {-| TcRnEmptyRecordUpdate is an error that occurs whenever a record is updated without specifying any field. Examples(s): $(deriveJSON defaultOptions{} ''Bad) -- not ok, no fields selected for update of defaultOptions Test cases: th/T12788 -} TcRnEmptyRecordUpdate :: TcRnMessage {-| TcRnIllegalFieldPunning is an error that occurs whenever field punning is used without the 'NamedFieldPuns' extension enabled. Examples(s): data Foo = Foo { a :: Int } foo :: Foo -> Int foo Foo{a} = a -- Not ok, punning used without extension. Test cases: parser/should_fail/RecordDotSyntaxFail12 -} TcRnIllegalFieldPunning :: !(Located RdrName) -> TcRnMessage {-| TcRnIllegalWildcardsInRecord is an error that occurs whenever wildcards (..) are used in a record without the relevant extension being enabled. Examples(s): data Foo = Foo { a :: Int } foo :: Foo -> Int foo Foo{..} = a -- Not ok, wildcards used without extension. Test cases: parser/should_fail/RecordWildCardsFail -} TcRnIllegalWildcardsInRecord :: !RecordFieldPart -> TcRnMessage {-| TcRnIllegalWildcardInType is an error that occurs when a wildcard appears in a type in a location in which wildcards aren't allowed. Examples: Type synonyms: type T = _ Class declarations and instances: class C _ instance C _ Standalone kind signatures: type D :: _ data D Test cases: ExtraConstraintsWildcardInTypeSplice2 ExtraConstraintsWildcardInTypeSpliceUsed ExtraConstraintsWildcardNotLast ExtraConstraintsWildcardTwice NestedExtraConstraintsWildcard NestedNamedExtraConstraintsWildcard PartialClassMethodSignature PartialClassMethodSignature2 T12039 T13324_fail1 UnnamedConstraintWildcard1 UnnamedConstraintWildcard2 WildcardInADT1 WildcardInADT2 WildcardInADT3 WildcardInADTContext1 WildcardInDefault WildcardInDefaultSignature WildcardInDeriving WildcardInForeignExport WildcardInForeignImport WildcardInGADT1 WildcardInGADT2 WildcardInInstanceHead WildcardInInstanceSig WildcardInNewtype WildcardInPatSynSig WildcardInStandaloneDeriving WildcardInTypeFamilyInstanceRHS WildcardInTypeSynonymRHS saks_fail003 T15433a -} TcRnIllegalWildcardInType :: Maybe Name -- ^ the wildcard name, or 'Nothing' for an anonymous wildcard -> !BadAnonWildcardContext -> TcRnMessage {-| TcRnIllegalNamedWildcardInTypeArgument is an error that occurs when a named wildcard is used in a required type argument. Example: vfun :: forall (a :: k) -> () x = vfun _nwc -- ^^^^ -- named wildcards not allowed in type arguments Test cases: T23738_fail_wild -} TcRnIllegalNamedWildcardInTypeArgument :: RdrName -> TcRnMessage {- TcRnIllegalImplicitTyVarInTypeArgument is an error raised when a type variable is implicitly quantified in a required type argument. Example: vfun :: forall (a :: k) -> () x = vfun (Nothing :: Maybe a) -- ^^^ -- implicit quantification not allowed in type arguments -} TcRnIllegalImplicitTyVarInTypeArgument :: RdrName -> TcRnMessage {-| TcRnDuplicateFieldName is an error that occurs whenever there are duplicate field names in a single record. Examples(s): data R = MkR { x :: Int, x :: Bool } f r = r { x = 3, x = 4 } Test cases: T21959. -} TcRnDuplicateFieldName :: !RecordFieldPart -> NE.NonEmpty RdrName -> TcRnMessage {-| TcRnIllegalViewPattern is an error that occurs whenever the ViewPatterns syntax is used but the ViewPatterns language extension is not enabled. Examples(s): data Foo = Foo { a :: Int } foo :: Foo -> Int foo (a -> l) = l -- not OK, the 'ViewPattern' extension is not enabled. Test cases: parser/should_fail/ViewPatternsFail -} TcRnIllegalViewPattern :: !(Pat GhcPs) -> TcRnMessage {-| TcRnCharLiteralOutOfRange is an error that occurs whenever a character is out of range. Examples(s): None Test cases: None -} TcRnCharLiteralOutOfRange :: !Char -> TcRnMessage {-| TcRnNegativeNumTypeLiteral is an error that occurs whenever a type-level number literal is negative. type Neg = -1 Test cases: th/T8412 typecheck/should_fail/T8306 -} TcRnNegativeNumTypeLiteral :: HsTyLit GhcPs -> TcRnMessage {-| TcRnIllegalWildcardsInConstructor is an error that occurs whenever the record wildcards '..' are used inside a constructor without labeled fields. Examples(s): None Test cases: rename/should_fail/T9815.hs rename/should_fail/T9815b.hs rename/should_fail/T9815ghci.hs rename/should_fail/T9815bghci.hs -} TcRnIllegalWildcardsInConstructor :: !Name -> TcRnMessage {-| TcRnIgnoringAnnotations is a warning that occurs when the source code contains annotation pragmas but the platform in use does not support an external interpreter such as GHCi and therefore the annotations are ignored. Example(s): None Test cases: None -} TcRnIgnoringAnnotations :: [LAnnDecl GhcRn] -> TcRnMessage {-| TcRnAnnotationInSafeHaskell is an error that occurs if annotation pragmas are used in conjunction with Safe Haskell. Example(s): None Test cases: annotations/should_fail/T10826 -} TcRnAnnotationInSafeHaskell :: TcRnMessage {-| TcRnInvalidTypeApplication is an error that occurs when a visible type application is used with an expression that does not accept "specified" type arguments. Example(s): foo :: forall {a}. a -> a foo x = x bar :: () bar = let x = foo @Int 42 in () Test cases: overloadedrecflds/should_fail/overloadedlabelsfail03 typecheck/should_fail/ExplicitSpecificity1 typecheck/should_fail/ExplicitSpecificity10 typecheck/should_fail/ExplicitSpecificity2 typecheck/should_fail/T17173 typecheck/should_fail/VtaFail -} TcRnInvalidTypeApplication :: Type -> LHsWcType GhcRn -> TcRnMessage {-| TcRnTagToEnumMissingValArg is an error that occurs when the 'tagToEnum#' function is not applied to a single value argument. Example(s): tagToEnum# 1 2 Test cases: None -} TcRnTagToEnumMissingValArg :: TcRnMessage {-| TcRnTagToEnumUnspecifiedResTy is an error that occurs when the 'tagToEnum#' function is not given a concrete result type. Example(s): foo :: forall a. a foo = tagToEnum# 0# Test cases: typecheck/should_fail/tcfail164 -} TcRnTagToEnumUnspecifiedResTy :: Type -> TcRnMessage {-| TcRnTagToEnumResTyNotAnEnum is an error that occurs when the 'tagToEnum#' function is given a result type that is not an enumeration type. Example(s): foo :: Int -- not an enumeration TyCon foo = tagToEnum# 0# Test cases: typecheck/should_fail/tcfail164 -} TcRnTagToEnumResTyNotAnEnum :: Type -> TcRnMessage {-| TcRnTagToEnumResTyTypeData is an error that occurs when the 'tagToEnum#' function is given a result type that is headed by a @type data@ type, as the data constructors of a @type data@ do not exist at the term level. Example(s): type data Letter = A | B | C foo :: Letter foo = tagToEnum# 0# Test cases: type-data/should_fail/TDTagToEnum.hs -} TcRnTagToEnumResTyTypeData :: Type -> TcRnMessage {-| TcRnArrowIfThenElsePredDependsOnResultTy is an error that occurs when the predicate type of an ifThenElse expression in arrow notation depends on the type of the result. Example(s): None Test cases: None -} TcRnArrowIfThenElsePredDependsOnResultTy :: TcRnMessage {-| TcRnIllegalHsBootOrSigDecl is an error that occurs when an hs-boot file contains declarations that are not allowed, such as bindings. Examples: -- A.hs-boot f :: Int -> Int f x = 2 * x -- binding not allowed -- B.hs-boot type family F a where { F Int = Bool } -- type family equations not allowed -- C.hsig bar :: Int -> Int {-# RULES forall x. bar x = x #-} -- RULES not allowed Test cases: - bindings: T19781 - class instance body: none - type family instance: HsBootFam - splice: none - foreign declaration: none - default declaration: none - RULEs: none -} TcRnIllegalHsBootOrSigDecl :: !HsBootOrSig -> !BadBootDecls -> TcRnMessage {-| TcRnBootMismatch is a family of errors that occur when there is a mismatch between the hs-boot and hs files. Examples: -- A.hs-boot foo :: Int -> Bool data D = MkD -- A.hs foo :: Int -> Char foo = chr data D = MkD Int Test cases: - missing export: bkpcabal06, bkpfail{01,05,09,16,35}, rnfail{047,055} - missing definition: none - missing instance: T14075 - mismatch in exports: bkpfail{03,19} - conflicting definitions: bkpcabal02, bkpfail{04,06,07,10,12,133,14,15,17,22,23,25,26,27,41,42,45,47,50,52,53,54}, T19244{a,b}, T23344, ClosedFam3, rnfail055 -} TcRnBootMismatch :: !HsBootOrSig -> !BootMismatch -> TcRnMessage {-| TcRnRecursivePatternSynonym is an error that occurs when a pattern synonym is defined in terms of itself, either directly or indirectly. Example(s): pattern A = B pattern B = A Test cases: patsyn/should_fail/T16900 -} TcRnRecursivePatternSynonym :: LHsBinds GhcRn -> TcRnMessage {-| TcRnPartialTypeSigTyVarMismatch is an error that occurs when a partial type signature attempts to unify two different types. Example(s): f :: a -> b -> _ f x y = [x, y] Test cases: partial-sigs/should_fail/T14449 -} TcRnPartialTypeSigTyVarMismatch :: Name -- ^ first type variable -> Name -- ^ second type variable -> Name -- ^ function name -> LHsSigWcType GhcRn -> TcRnMessage {-| TcRnPartialTypeSigBadQuantifier is an error that occurs when a type variable being quantified over in the partial type signature of a function gets unified with a type that is free in that function's context. Example(s): foo :: Num a => a -> a foo xxx = g xxx where g :: forall b. Num b => _ -> b g y = xxx + y Test cases: partial-sig/should_fail/T14479 -} TcRnPartialTypeSigBadQuantifier :: Name -- ^ user-written name of type variable being quantified -> Name -- ^ function name -> Maybe Type -- ^ type the variable unified with, if known -> LHsSigWcType GhcRn -- ^ partial type signature -> TcRnMessage {-| TcRnMissingSignature is a warning that occurs when a top-level binding or a pattern synonym does not have a type signature. Controlled by the flags: -Wmissing-signatures -Wmissing-exported-signatures -Wmissing-pattern-synonym-signatures -Wmissing-exported-pattern-synonym-signatures -Wmissing-kind-signatures -Wmissing-poly-kind-signatures Test cases: T11077 (top-level bindings) T12484 (pattern synonyms) T19564 (kind signatures) -} TcRnMissingSignature :: MissingSignature -> Exported -> TcRnMessage {-| TcRnPolymorphicBinderMissingSig is a warning controlled by -Wmissing-local-signatures that occurs when a local polymorphic binding lacks a type signature. Example(s): id a = a Test cases: warnings/should_compile/T12574 -} TcRnPolymorphicBinderMissingSig :: Name -> Type -> TcRnMessage {-| TcRnOverloadedSig is an error that occurs when a binding group conflicts with the monomorphism restriction. Example(s): data T a = T a mono = ... where x :: Applicative f => f a T x = ... Test cases: typecheck/should_compile/T11339 -} TcRnOverloadedSig :: TcIdSig -> TcRnMessage {-| TcRnTupleConstraintInst is an error that occurs whenever an instance for a tuple constraint is specified. Examples(s): class C m a class D m a f :: (forall a. Eq a => (C m a, D m a)) => m a f = undefined Test cases: quantified-constraints/T15334 -} TcRnTupleConstraintInst :: !Class -> TcRnMessage {-| TcRnUserTypeError is an error that occurs due to a user's custom type error, which can be triggered by adding a `TypeError` constraint in a type signature or typeclass instance. Examples(s): f :: TypeError (Text "This is a type error") f = undefined Test cases: typecheck/should_fail/CustomTypeErrors02 typecheck/should_fail/CustomTypeErrors03 -} TcRnUserTypeError :: !Type -> TcRnMessage {-| TcRnConstraintInKind is an error that occurs whenever a constraint is specified in a kind. Examples(s): data Q :: Eq a => Type where {} Test cases: dependent/should_fail/T13895 polykinds/T16263 saks/should_fail/saks_fail004 typecheck/should_fail/T16059a typecheck/should_fail/T18714 -} TcRnConstraintInKind :: !Type -> TcRnMessage {-| TcRnUnboxedTupleTypeFuncArg is an error that occurs whenever an unboxed tuple or unboxed sum type is specified as a function argument, when the appropriate extension (`-XUnboxedTuples` or `-XUnboxedSums`) isn't enabled. Examples(s): -- T15073.hs import T15073a newtype Foo a = MkFoo a deriving P -- T15073a.hs class P a where p :: a -> (# a #) Test cases: deriving/should_fail/T15073.hs deriving/should_fail/T15073a.hs typecheck/should_fail/T16059d -} TcRnUnboxedTupleOrSumTypeFuncArg :: UnboxedTupleOrSum -- ^ whether this is an unboxed tuple or an unboxed sum -> !Type -> TcRnMessage {-| TcRnLinearFuncInKind is an error that occurs whenever a linear function is specified in a kind. Examples(s): data A :: * %1 -> * Test cases: linear/should_fail/LinearKind linear/should_fail/LinearKind2 linear/should_fail/LinearKind3 -} TcRnLinearFuncInKind :: !Type -> TcRnMessage {-| TcRnForAllEscapeError is an error that occurs whenever a quantified type's kind mentions quantified type variable. Examples(s): type T :: TYPE (BoxedRep l) data T = MkT Test cases: unlifted-datatypes/should_fail/UnlDataNullaryPoly -} TcRnForAllEscapeError :: !Type -> !Kind -> TcRnMessage {-| TcRnVDQInTermType is an error that occurs whenever a visible dependent quantification is specified in the type of a term. Examples(s): a = (undefined :: forall k -> k -> Type) @Int Test cases: dependent/should_fail/T15859 dependent/should_fail/T16326_Fail1 dependent/should_fail/T16326_Fail2 dependent/should_fail/T16326_Fail3 dependent/should_fail/T16326_Fail4 dependent/should_fail/T16326_Fail5 dependent/should_fail/T16326_Fail6 dependent/should_fail/T16326_Fail7 dependent/should_fail/T16326_Fail8 dependent/should_fail/T16326_Fail9 dependent/should_fail/T16326_Fail10 dependent/should_fail/T16326_Fail11 dependent/should_fail/T16326_Fail12 dependent/should_fail/T17687 dependent/should_fail/T18271 -} TcRnVDQInTermType :: !(Maybe Type) -> TcRnMessage {-| TcRnBadQuantPredHead is an error that occurs whenever a quantified predicate lacks a class or type variable head. Examples(s): class (forall a. A t a => A t [a]) => B t where type A t a :: Constraint Test cases: quantified-constraints/T16474 -} TcRnBadQuantPredHead :: !Type -> TcRnMessage {-| TcRnIllegalTupleConstraint is an error that occurs whenever an illegal tuple constraint is specified. Examples(s): g :: ((Show a, Num a), Eq a) => a -> a g = undefined Test cases: typecheck/should_fail/tcfail209a -} TcRnIllegalTupleConstraint :: !Type -> TcRnMessage {-| TcRnNonTypeVarArgInConstraint is an error that occurs whenever a non type-variable argument is specified in a constraint. Examples(s): data T instance Eq Int => Eq T Test cases: ghci/scripts/T13202 ghci/scripts/T13202a polykinds/T12055a typecheck/should_fail/T10351 typecheck/should_fail/T19187 typecheck/should_fail/T6022 typecheck/should_fail/T8883 -} TcRnNonTypeVarArgInConstraint :: !Type -> TcRnMessage {-| TcRnIllegalImplicitParam is an error that occurs whenever an illegal implicit parameter is specified. Examples(s): type Bla = ?x::Int data T = T instance Bla => Eq T Test cases: polykinds/T11466 typecheck/should_fail/T8912 typecheck/should_fail/tcfail041 typecheck/should_fail/tcfail211 typecheck/should_fail/tcrun045 -} TcRnIllegalImplicitParam :: !Type -> TcRnMessage {-| TcRnIllegalConstraintSynonymOfKind is an error that occurs whenever an illegal constraint synonym of kind is specified. Examples(s): type Showish = Show f :: (Showish a) => a -> a f = undefined Test cases: typecheck/should_fail/tcfail209 -} TcRnIllegalConstraintSynonymOfKind :: !Type -> TcRnMessage {-| TcRnOversaturatedVisibleKindArg is an error that occurs whenever an illegal oversaturated visible kind argument is specified. Examples(s): type family F2 :: forall (a :: Type). Type where F2 @a = Maybe a Test cases: typecheck/should_fail/T15793 typecheck/should_fail/T16255 -} TcRnOversaturatedVisibleKindArg :: !Type -> TcRnMessage {-| TcRnForAllRankErr is an error that occurs whenever an illegal ranked type is specified. Examples(s): foo :: (a,b) -> (a~b => t) -> (a,b) foo p x = p Test cases: - ghci/should_run/T15806 - indexed-types/should_fail/SimpleFail15 - typecheck/should_fail/T11355 - typecheck/should_fail/T12083a - typecheck/should_fail/T12083b - typecheck/should_fail/T16059c - typecheck/should_fail/T16059e - typecheck/should_fail/T17213 - typecheck/should_fail/T18939_Fail - typecheck/should_fail/T2538 - typecheck/should_fail/T5957 - typecheck/should_fail/T7019 - typecheck/should_fail/T7019a - typecheck/should_fail/T7809 - typecheck/should_fail/T9196 - typecheck/should_fail/tcfail127 - typecheck/should_fail/tcfail184 - typecheck/should_fail/tcfail196 - typecheck/should_fail/tcfail197 -} TcRnForAllRankErr :: !Rank -> !Type -> TcRnMessage {-| TcRnSimplifiableConstraint is a warning triggered by the occurrence of a simplifiable constraint in a context, when MonoLocalBinds is not enabled. Examples(s): simplifiableEq :: Eq (a, a) => a -> a -> Bool simplifiableEq = undefined Test cases: - indexed-types/should_compile/T15322 - partial-sigs/should_compile/SomethingShowable - typecheck/should_compile/T13526 -} TcRnSimplifiableConstraint :: !PredType -> !InstanceWhat -> TcRnMessage {-| TcRnArityMismatch is an error that occurs when a type constructor is supplied with fewer arguments than required. Examples(s): f Left = undefined Test cases: - backpack/should_fail/bkpfail25.bkp - ghci/should_fail/T16013 - ghci/should_fail/T16287 - indexed-types/should_fail/BadSock - indexed-types/should_fail/T9433 - module/mod60 - ndexed-types/should_fail/T2157 - parser/should_fail/ParserNoBinaryLiterals2 - parser/should_fail/ParserNoBinaryLiterals3 - patsyn/should_fail/T12819 - polykinds/T10516 - typecheck/should_fail/T12124 - typecheck/should_fail/T15954 - typecheck/should_fail/T16874 - typecheck/should_fail/tcfail100 - typecheck/should_fail/tcfail101 - typecheck/should_fail/tcfail107 - typecheck/should_fail/tcfail129 - typecheck/should_fail/tcfail187 -} TcRnArityMismatch :: !TyThing -> !Arity -- ^ expected arity -> !Arity -- ^ actual arity -> TcRnMessage {-| TcRnIllegalClassInstance is a collection of diagnostics that arise from an invalid class or family instance declaration. See t'IllegalInstanceReason'. -} TcRnIllegalInstance :: IllegalInstanceReason -> TcRnMessage {-| TcRnMonomorphicBindings is a warning (controlled by -Wmonomorphism-restriction) that arises when the monomorphism restriction applies to the given bindings. Examples(s): {-# OPTIONS_GHC -Wmonomorphism-restriction #-} bar = 10 foo :: Int foo = bar main :: IO () main = print foo The example above emits the warning (for 'bar'), because without monomorphism restriction the inferred type for 'bar' is 'bar :: Num p => p'. This warning tells us that /if/ we were to enable '-XMonomorphismRestriction' we would make 'bar' less polymorphic, as its type would become 'bar :: Int', so GHC warns us about that. Test cases: typecheck/should_compile/T13785 -} TcRnMonomorphicBindings :: [Name] -> TcRnMessage {-| TcRnOrphanInstance is a warning (controlled by -Worphans) that arises when a typeclass instance or family instance is an \"orphan\", i.e. if it appears in a module in which neither the class/family nor the type being instanced are declared in the same module. Examples(s): None Test cases: warnings/should_compile/T9178 typecheck/should_compile/T4912 -} TcRnOrphanInstance :: Either ClsInst FamInst -> TcRnMessage {-| TcRnFunDepConflict is an error that occurs when there are functional dependencies conflicts between instance declarations. Examples(s): None Test cases: typecheck/should_fail/T2307 typecheck/should_fail/tcfail096 typecheck/should_fail/tcfail202 -} TcRnFunDepConflict :: !UnitState -> NE.NonEmpty ClsInst -> TcRnMessage {-| TcRnDupInstanceDecls is an error that occurs when there are duplicate instance declarations. Examples(s): class Foo a where foo :: a -> Int instance Foo Int where foo = id instance Foo Int where foo = const 42 Test cases: cabal/T12733/T12733 typecheck/should_fail/tcfail035 typecheck/should_fail/tcfail023 backpack/should_fail/bkpfail18 typecheck/should_fail/TcNullaryTCFail typecheck/should_fail/tcfail036 typecheck/should_fail/tcfail073 module/mod51 module/mod52 module/mod44 -} TcRnDupInstanceDecls :: !UnitState -> NE.NonEmpty ClsInst -> TcRnMessage {-| TcRnConflictingFamInstDecls is an error that occurs when there are conflicting family instance declarations. Examples(s): None. Test cases: indexed-types/should_fail/ExplicitForAllFams4b indexed-types/should_fail/NoGood indexed-types/should_fail/Over indexed-types/should_fail/OverDirectThisMod indexed-types/should_fail/OverIndirectThisMod indexed-types/should_fail/SimpleFail11a indexed-types/should_fail/SimpleFail11b indexed-types/should_fail/SimpleFail11c indexed-types/should_fail/SimpleFail11d indexed-types/should_fail/SimpleFail2a indexed-types/should_fail/SimpleFail2b indexed-types/should_fail/T13092/T13092 indexed-types/should_fail/T13092c/T13092c indexed-types/should_fail/T14179 indexed-types/should_fail/T2334A indexed-types/should_fail/T2677 indexed-types/should_fail/T3330b indexed-types/should_fail/T4246 indexed-types/should_fail/T7102a indexed-types/should_fail/T9371 polykinds/T7524 typecheck/should_fail/UnliftedNewtypesOverlap -} TcRnConflictingFamInstDecls :: NE.NonEmpty FamInst -> TcRnMessage {-| TcRnFamInstNotInjective is a collection of errors that arise from a type family equation violating the injectivity annotation. See 'InjectivityErrReason'. -} TcRnFamInstNotInjective :: InjectivityErrReason -- ^ the violation -> TyCon -- ^ the family 'TyCon' -> NE.NonEmpty CoAxBranch -- ^ the family equations -> TcRnMessage {-| TcRnBangOnUnliftedType is a warning (controlled by -Wredundant-strictness-flags) that occurs when a strictness annotation is applied to an unlifted type. Example(s): data T = MkT !Int# -- Strictness flag has no effect on unlifted types Test cases: typecheck/should_compile/T20187a typecheck/should_compile/T20187b -} TcRnBangOnUnliftedType :: !Type -> TcRnMessage {-| TcRnLazyBangOnUnliftedType is a warning (controlled by -Wredundant-strictness-flags) that occurs when a lazy annotation is applied to an unlifted type. Example(s): data T = MkT ~Int# -- Lazy flag has no effect on unlifted types Test cases: typecheck/should_compile/T21951a typecheck/should_compile/T21951b -} TcRnLazyBangOnUnliftedType :: !Type -> TcRnMessage {-| TcRnMultipleDefaultDeclarations is an error that occurs when a module has more than one default declaration for the same class. Example: default (Integer, Int) -- implicitly applies to Num default (Double, Float) -- 2nd default declaration not allowed Text cases: module/mod58 -} TcRnMultipleDefaultDeclarations :: TyCon -> [LDefaultDecl GhcRn] -> TcRnMessage {-| TcRnWarnClashingDefaultImports is a warning that occurs when a module imports more than one default declaration for the same class, and they are not all subsumed by one of them nor by a local `default` declaration. See Note [Named default declarations] in GHC.Tc.Gen.Default Test cases: default/Import07.hs -} TcRnWarnClashingDefaultImports :: TyCon -- ^ class -> Maybe [Type] -- ^ locally declared defaults -> NE.NonEmpty ClassDefaults -- ^ imported defaults -> TcRnMessage {-| TcRnBadDefaultType is an error that occurs when a type used in a default declaration does not have an instance for any of the applicable classes. Example(s): data Foo default (Foo) Test cases: typecheck/should_fail/T11974b -} TcRnBadDefaultType :: Type -> [TyCon] -> TcRnMessage {-| TcRnPatSynBundledWithNonDataCon is an error that occurs when a module's export list bundles a pattern synonym with a type that is not a proper `data` or `newtype` construction. Example(s): module Foo (MyClass(.., P)) where pattern P = Nothing class MyClass a where foo :: a -> Int Test cases: patsyn/should_fail/export-class -} TcRnPatSynBundledWithNonDataCon :: TcRnMessage {-| TcRnPatSynBundledWithWrongType is an error that occurs when the export list of a module has a pattern synonym bundled with a type that does not match the type of the pattern synonym. Example(s): module Foo (R(P,x)) where data Q = Q Int data R = R pattern P{x} = Q x Text cases: patsyn/should_fail/export-ps-rec-sel patsyn/should_fail/export-type-synonym patsyn/should_fail/export-type -} TcRnPatSynBundledWithWrongType :: Type -> Type -> TcRnMessage {-| TcRnDupeModuleExport is a warning controlled by @-Wduplicate-exports@ that occurs when a module appears more than once in an export list. Example(s): module Foo (module Bar, module Bar) import Bar Text cases: None -} TcRnDupeModuleExport :: ModuleName -> TcRnMessage {-| TcRnExportedModNotImported is an error that occurs when an export list contains a module that is not imported. Example(s): None Text cases: module/mod135 module/mod8 rename/should_fail/rnfail028 backpack/should_fail/bkpfail48 -} TcRnExportedModNotImported :: ModuleName -> TcRnMessage {-| TcRnNullExportedModule is a warning controlled by -Wdodgy-exports that occurs when an export list contains a module that has no exports. Example(s): module Foo (module Bar) where import Bar () Test cases: None -} TcRnNullExportedModule :: ModuleName -> TcRnMessage {-| TcRnMissingExportList is a warning controlled by -Wmissing-export-lists that occurs when a module does not have an explicit export list. Example(s): None Test cases: typecheck/should_fail/MissingExportList03 -} TcRnMissingExportList :: ModuleName -> TcRnMessage {-| TcRnExportHiddenComponents is an error that occurs when an export contains constructor or class methods that are not visible. Example(s): None Test cases: None -} TcRnExportHiddenComponents :: IE GhcPs -> TcRnMessage {-| TcRnExportHiddenDefault is an error that occurs when an export contains a class default (with language extension NamedDefaults) that is not visible. Example(s): None Test cases: default/fail06.hs -} TcRnExportHiddenDefault :: IE GhcPs -> TcRnMessage {-| TcRnDuplicateExport is a warning (controlled by -Wduplicate-exports) that occurs when an identifier appears in an export list more than once. Example(s): None Test cases: module/MultiExport module/mod128 module/mod14 module/mod5 overloadedrecflds/should_fail/DuplicateExports patsyn/should_compile/T11959 -} TcRnDuplicateExport :: GlobalRdrElt -> IE GhcPs -> IE GhcPs -> TcRnMessage {-| TcRnExportedParentChildMismatch is an error that occurs when an export is bundled with a parent that it does not belong to Example(s): module Foo (T(a)) where data T a = True Test cases: module/T11970 module/T11970B module/mod17 module/mod3 overloadedrecflds/should_fail/NoParent -} TcRnExportedParentChildMismatch :: Name -- ^ parent -> TyThing -> Name -- ^ child -> [Name] -> TcRnMessage {-| TcRnConflictingExports is an error that occurs when different identifiers that have the same name are being exported by a module. Example(s): module Foo (Bar.f, module Baz) where import qualified Bar (f) import Baz (f) Test cases: module/mod131 module/mod142 module/mod143 module/mod144 module/mod145 module/mod146 module/mod150 module/mod155 overloadedrecflds/should_fail/T14953 overloadedrecflds/should_fail/overloadedrecfldsfail10 rename/should_fail/rnfail029 rename/should_fail/rnfail040 typecheck/should_fail/T16453E2 typecheck/should_fail/tcfail025 typecheck/should_fail/tcfail026 -} TcRnConflictingExports :: OccName -- ^ Occurrence name shared by both exports -> GlobalRdrElt -- ^ First export -> IE GhcPs -- ^ Export decl of first export -> GlobalRdrElt -- ^ Second export -> IE GhcPs -- ^ Export decl of second export -> TcRnMessage {-| TcRnDuplicateFieldExport is an error that occurs when a module exports multiple record fields with the same name, without enabling DuplicateRecordFields. Example: module M1 where data D1 = MkD1 { foo :: Int } module M2 where data D2 = MkD2 { foo :: Int } module M ( D1(..), D2(..) ) where import module M1 import module M2 Test case: overloadedrecflds/should_fail/overloadedrecfldsfail10 -} TcRnDuplicateFieldExport :: (GlobalRdrElt, IE GhcPs) -> NE.NonEmpty (GlobalRdrElt, IE GhcPs) -> TcRnMessage {-| TcRnAmbiguousRecordUpdate is a warning, controlled by -Wambiguous-fields, which occurs when a user relies on the type-directed disambiguation mechanism to disambiguate a record update. This will not be supported by -XDuplicateRecordFields in future releases. Example(s): data Person = MkPerson { personId :: Int, name :: String } data Address = MkAddress { personId :: Int, address :: String } bad1 x = x { personId = 4 } :: Person -- ambiguous bad2 (x :: Person) = x { personId = 4 } -- ambiguous good x = (x :: Person) { personId = 4 } -- not ambiguous Test cases: overloadedrecflds/should_fail/overloadedrecfldsfail06 -} TcRnAmbiguousRecordUpdate :: HsExpr GhcRn -- ^ Field update -> TyCon -- ^ Record type -> TcRnMessage {-| TcRnMissingFields is a warning controlled by -Wmissing-fields occurring when the intialisation of a record is missing one or more (lazy) fields. Example(s): data Rec = Rec { a :: Int, b :: String, c :: Bool } x = Rec { a = 1, b = "two" } -- missing field 'c' Test cases: deSugar/should_compile/T13870 deSugar/should_compile/ds041 patsyn/should_compile/T11283 rename/should_compile/T5334 rename/should_compile/T12229 rename/should_compile/T5892a warnings/should_fail/WerrorFail2 -} TcRnMissingFields :: ConLike -> [(FieldLabelString, TcType)] -> TcRnMessage {-| TcRnFieldUpdateInvalidType is an error occurring when an updated field's type mentions something that is outside the universally quantified variables of the data constructor, such as an existentially quantified type. Example(s): data X = forall a. MkX { f :: a } x = (MkX ()) { f = False } Test cases: patsyn/should_fail/records-exquant typecheck/should_fail/T3323 -} TcRnFieldUpdateInvalidType :: [(FieldLabelString,TcType)] -> TcRnMessage {-| TcRnMissingStrictFields is an error occurring when a record field marked as strict is omitted when constructing said record. Example(s): data R = R { strictField :: !Bool, nonStrict :: Int } x = R { nonStrict = 1 } Test cases: typecheck/should_fail/T18869 typecheck/should_fail/tcfail085 typecheck/should_fail/tcfail112 -} TcRnMissingStrictFields :: ConLike -> [(FieldLabelString, TcType)] -> TcRnMessage {-| TcRnAmbiguousFieldInUpdate is an error that occurs when a field in a record update clashes with another field or top-level function of the same name, and the user hasn't enabled -XDisambiguateRecordFields. Example: {-# LANGUAGE NoFieldSelectors #-} {-# LANGUAGE NoDisambiguateRecordFields #-} module M where data A = MkA { fld :: Int } fld :: Bool fld = False f r = r { fld = 3 } -} TcRnAmbiguousFieldInUpdate :: (GlobalRdrElt, GlobalRdrElt, [GlobalRdrElt]) -> TcRnMessage {-| TcRnBadRecordUpdate is an error when a regular (non-overloaded) record update cannot be pinned down to any one parent. The problem with the record update is stored in the 'BadRecordUpdateReason' field. Example(s): data R1 = R1 { x :: Int } data R2 = R2 { x :: Int } update r = r { x = 1 } -- ambiguous data R1 = R1 { x :: Int, y :: Int } data R2 = R2 { y :: Int, z :: Int } update r = r { x = 1, y = 2, z = 3 } -- no parent has all the fields Test cases: overloadedrecflds/should_fail/overloadedrecfldsfail01 overloadedrecflds/should_fail/overloadedrecfldsfail01 overloadedrecflds/should_fail/overloadedrecfldsfail14 -} TcRnBadRecordUpdate :: [RdrName] -- ^ the fields of the record update -> BadRecordUpdateReason -- ^ the reason this record update was rejected -> TcRnMessage {-| TcRnStaticFormNotClosed is an error pertaining to terms that are marked static using the -XStaticPointers extension but which are not closed terms. Example(s): f x = static x Test cases: rename/should_fail/RnStaticPointersFail01 rename/should_fail/RnStaticPointersFail03 -} TcRnStaticFormNotClosed :: Name -> NotClosedReason -> TcRnMessage {-| TcRnUselessTypeable is a warning (controlled by -Wderiving-typeable) that occurs when trying to derive an instance of the 'Typeable' class. Deriving 'Typeable' is no longer necessary (hence the \"useless\") as all types automatically derive 'Typeable' in modern GHC versions. Example(s): None. Test cases: warnings/should_compile/DerivingTypeable -} TcRnUselessTypeable :: TcRnMessage {-| TcRnDerivingDefaults is a warning (controlled by -Wderiving-defaults) that occurs when both 'DeriveAnyClass' and 'GeneralizedNewtypeDeriving' are enabled, and therefore GHC defaults to 'DeriveAnyClass', which might not be what the user wants. Example(s): None. Test cases: typecheck/should_compile/T15839a deriving/should_compile/T16179 -} TcRnDerivingDefaults :: !Class -> TcRnMessage {-| TcRnNonUnaryTypeclassConstraint is an error that occurs when GHC encounters a non-unary constraint when trying to derive a typeclass. Example(s): class A deriving instance A data B deriving A -- We cannot derive A, is not unary (i.e. 'class A a'). Test cases: deriving/should_fail/T7959 deriving/should_fail/drvfail005 deriving/should_fail/drvfail009 deriving/should_fail/drvfail006 -} TcRnNonUnaryTypeclassConstraint :: !UserTypeCtxt -> !(LHsSigType GhcRn) -> TcRnMessage {-| TcRnPartialTypeSignatures is a warning (controlled by -Wpartial-type-signatures) that occurs when a wildcard '_' is found in place of a type in a signature or a type class derivation Example(s): foo :: _ -> Int foo = ... deriving instance _ => Eq (Foo a) Test cases: dependent/should_compile/T11241 dependent/should_compile/T15076 dependent/should_compile/T14880-2 typecheck/should_compile/T17024 typecheck/should_compile/T10072 partial-sigs/should_fail/TidyClash2 partial-sigs/should_fail/Defaulting1MROff partial-sigs/should_fail/WildcardsInPatternAndExprSig partial-sigs/should_fail/T10615 partial-sigs/should_fail/T14584a partial-sigs/should_fail/TidyClash partial-sigs/should_fail/T11122 partial-sigs/should_fail/T14584 partial-sigs/should_fail/T10045 partial-sigs/should_fail/PartialTypeSignaturesDisabled partial-sigs/should_fail/T10999 partial-sigs/should_fail/ExtraConstraintsWildcardInExpressionSignature partial-sigs/should_fail/ExtraConstraintsWildcardInPatternSplice partial-sigs/should_fail/WildcardInstantiations partial-sigs/should_run/T15415 partial-sigs/should_compile/T10463 partial-sigs/should_compile/T15039a partial-sigs/should_compile/T16728b partial-sigs/should_compile/T15039c partial-sigs/should_compile/T10438 partial-sigs/should_compile/SplicesUsed partial-sigs/should_compile/T18008 partial-sigs/should_compile/ExprSigLocal partial-sigs/should_compile/T11339a partial-sigs/should_compile/T11670 partial-sigs/should_compile/WarningWildcardInstantiations partial-sigs/should_compile/T16728 partial-sigs/should_compile/T12033 partial-sigs/should_compile/T15039b partial-sigs/should_compile/T10403 partial-sigs/should_compile/T11192 partial-sigs/should_compile/T16728a partial-sigs/should_compile/TypedSplice partial-sigs/should_compile/T15039d partial-sigs/should_compile/T11016 partial-sigs/should_compile/T13324_compile2 linear/should_fail/LinearPartialSig polykinds/T14265 polykinds/T14172 -} TcRnPartialTypeSignatures :: !SuggestPartialTypeSignatures -> !ThetaType -> TcRnMessage {-| TcRnCannotDeriveInstance is an error that occurs every time a typeclass instance can't be derived. The 'DeriveInstanceErrReason' will contain the specific reason this error arose. Example(s): None. Test cases: generics/T10604/T10604_no_PolyKinds deriving/should_fail/drvfail009 deriving/should_fail/drvfail-functor2 deriving/should_fail/T10598_fail3 deriving/should_fail/deriving-via-fail2 deriving/should_fail/deriving-via-fail deriving/should_fail/T16181 -} TcRnCannotDeriveInstance :: !Class -- ^ The typeclass we are trying to derive -- an instance for -> [Type] -- ^ The typeclass arguments, if any. -> !(Maybe (DerivStrategy GhcTc)) -- ^ The derivation strategy, if any. -> !UsingGeneralizedNewtypeDeriving -- ^ Is '-XGeneralizedNewtypeDeriving' enabled? -> !DeriveInstanceErrReason -- ^ The specific reason why we couldn't derive -- an instance for the class. -> TcRnMessage {-| TcRnLazyGADTPattern is an error that occurs when a user writes a nested GADT pattern match inside a lazy (~) pattern. Test case: gadt/lazypat -} TcRnLazyGADTPattern :: TcRnMessage {-| TcRnArrowProcGADTPattern is an error that occurs when a user writes a GADT pattern inside arrow proc notation. Test case: arrows/should_fail/arrowfail004. -} TcRnArrowProcGADTPattern :: TcRnMessage {-| TcRnCapturedTermName is a warning (controlled by -Wterm-variable-capture) that occurs when an implicitly quantified type variable's name is already used for a term. Example: a = 10 f :: a -> a Test cases: T22513a T22513b T22513c T22513d T22513e T22513f T22513g T22513h T22513i -} TcRnCapturedTermName :: RdrName -> Either [GlobalRdrElt] Name -> TcRnMessage {-| TcRnTypeEqualityOutOfScope is a warning (controlled by -Wtype-equality-out-of-scope) that occurs when the type equality (a ~ b) is not in scope. Test case: warnings/should_compile/T18862b -} TcRnTypeEqualityOutOfScope :: TcRnMessage {-| TcRnTypeEqualityRequiresOperators is a warning (controlled by -Wtype-equality-requires-operators) that occurs when the type equality (a ~ b) is used without the TypeOperators extension. Example: {-# LANGUAGE NoTypeOperators #-} f :: (a ~ b) => a -> b Test case: T18862a -} TcRnTypeEqualityRequiresOperators :: TcRnMessage {-| TcRnIllegalTypeOperator is an error that occurs when a type operator is used without the TypeOperators extension. Example: {-# LANGUAGE NoTypeOperators #-} f :: Vec a n -> Vec a m -> Vec a (n + m) Test case: T12811 -} TcRnIllegalTypeOperator :: !SDoc -> !RdrName -> TcRnMessage {-| TcRnIllegalTypeOperatorDecl is an error that occurs when a type or class operator is declared without the TypeOperators extension. See Note [Type and class operator definitions] Example: {-# LANGUAGE Haskell2010 #-} {-# LANGUAGE MultiParamTypeClasses #-} module T3265 where data a :+: b = Left a | Right b class a :*: b where {} Test cases: T3265, tcfail173 -} TcRnIllegalTypeOperatorDecl :: !RdrName -> TcRnMessage {-| TcRnGADTMonoLocalBinds is a warning controlled by -Wgadt-mono-local-binds that occurs when pattern matching on a GADT when -XMonoLocalBinds is off. Example(s): None Test cases: T20485, T20485a -} TcRnGADTMonoLocalBinds :: TcRnMessage {-| The TcRnNotInScope constructor is used for various not-in-scope errors. See 'NotInScopeError' for more details. -} TcRnNotInScope :: NotInScopeError -- ^ what the problem is -> RdrName -- ^ the name that is not in scope -> [ImportError] -- ^ import errors that are relevant -> [GhcHint] -- ^ hints, e.g. enable DataKinds to refer to a promoted data constructor -> TcRnMessage {-| TcRnTermNameInType is an error that occurs when a term-level identifier is used in a type. Example: import qualified Prelude bad :: Prelude.fst (Bool, Float) bad = False Test cases: T21605{c,d} -} TcRnTermNameInType :: RdrName -> [GhcHint] -> TcRnMessage {-| TcRnUntickedPromotedThing is a warning (controlled with -Wunticked-promoted-constructors) that is triggered by an unticked occurrence of a promoted data constructor. Examples: data A = MkA type family F (a :: A) where { F MkA = Bool } type B = [ Int, Bool ] Test cases: T9778, T19984. -} TcRnUntickedPromotedThing :: UntickedPromotedThing -> TcRnMessage {-| TcRnIllegalBuiltinSyntax is an error that occurs when built-in syntax appears in an unexpected location, e.g. as a data constructor or in a fixity declaration. Examples: infixl 5 : data P = (,) Test cases: rnfail042, T14907b, T15124, T15233. -} TcRnIllegalBuiltinSyntax :: SDoc -- ^ what kind of thing this is (a binding, fixity declaration, ...) -> RdrName -> TcRnMessage -- TODO: remove the SDoc argument. {-| TcRnWarnDefaulting is a warning (controlled by -Wtype-defaults) that is triggered whenever a Wanted typeclass constraint is solving through the defaulting of a type variable. Example: one = show 1 -- We get Wanteds Show a0, Num a0, and default a0 to Integer. Test cases: none (which are really specific to defaulting), but see e.g. tcfail204. -} TcRnWarnDefaulting :: [Ct] -- ^ Wanted constraints in which defaulting occurred -> Maybe TyVar -- ^ The type variable being defaulted -> Type -- ^ The default type -> TcRnMessage {-| TcRnIncorrectNameSpace is an error that occurs when a 'Name' is used in the incorrect 'NameSpace', e.g. a type constructor or class used in a term, or a term variable used in a type. Example: list2 = $( conE ''(:) `appE` litE (IntegerL 5) `appE` conE '[] ) -- ^^^^^ -- should use a single quotation tick, i.e. '(:) Test cases: T20884. -} TcRnIncorrectNameSpace :: Name -> Bool -- ^ whether the error is happening -- in a Template Haskell tick -- (so we should give a Template Haskell hint) -> TcRnMessage {-| TcRnForeignImportPrimExtNotSet is an error occurring when a foreign import is declared using the @prim@ calling convention without having turned on the -XGHCForeignImportPrim extension. Example(s): foreign import prim "foo" foo :: ByteArray# -> (# Int#, Int# #) Test cases: ffi/should_fail/T20116 -} TcRnForeignImportPrimExtNotSet :: ForeignImport GhcRn -> TcRnMessage {-| TcRnForeignImportPrimSafeAnn is an error declaring that the safe/unsafe annotation should not be used with @prim@ foreign imports. Example(s): foreign import prim unsafe "my_primop_cmm" :: ... Test cases: None -} TcRnForeignImportPrimSafeAnn :: ForeignImport GhcRn -> TcRnMessage {-| TcRnForeignFunctionImportAsValue is an error explaining that foreign @value@ imports cannot have function types. Example(s): foreign import capi "math.h value sqrt" f :: CInt -> CInt Test cases: ffi/should_fail/capi_value_function -} TcRnForeignFunctionImportAsValue :: ForeignImport GhcRn -> TcRnMessage {-| TcRnFunPtrImportWithoutAmpersand is a warning controlled by @-Wdodgy-foreign-imports@ that informs the user of a possible missing @&@ in the declaration of a foreign import with a 'FunPtr' return type. Example(s): foreign import ccall "f" f :: FunPtr (Int -> IO ()) Test cases: ffi/should_compile/T1357 -} TcRnFunPtrImportWithoutAmpersand :: ForeignImport GhcRn -> TcRnMessage {-| TcRnIllegalForeignDeclBackend is an error occurring when a foreign import declaration is not compatible with the code generation backend being used. Example(s): None Test cases: None -} TcRnIllegalForeignDeclBackend :: Either (ForeignExport GhcRn) (ForeignImport GhcRn) -> Backend -> ExpectedBackends -> TcRnMessage {-| TcRnUnsupportedCallConv informs the user that the calling convention specified for a foreign export declaration is not compatible with the target platform. It is a warning controlled by @-Wunsupported-calling-conventions@ in the case of @stdcall@ but is otherwise considered an error. Example(s): None Test cases: None -} TcRnUnsupportedCallConv :: Either (ForeignExport GhcRn) (ForeignImport GhcRn) -> UnsupportedCallConvention -> TcRnMessage {-| TcRnIllegalForeignType is an error for when a type appears in a foreign function signature that is not compatible with the FFI. Example(s): None Test cases: ffi/should_fail/T3066 ffi/should_fail/ccfail004 ffi/should_fail/T10461 ffi/should_fail/T7506 ffi/should_fail/T5664 safeHaskell/ghci/p6 safeHaskell/safeLanguage/SafeLang08 ffi/should_fail/T16702 linear/should_fail/LinearFFI ffi/should_fail/T7243 -} TcRnIllegalForeignType :: !(Maybe ArgOrResult) -> !IllegalForeignTypeReason -> TcRnMessage {-| TcRnInvalidCIdentifier indicates a C identifier that is not valid. Example(s): foreign import prim safe "not valid" cmm_test2 :: Int# -> Int# Test cases: th/T10638 -} TcRnInvalidCIdentifier :: !CLabelString -> TcRnMessage {-| TcRnExpectedValueId is an error occurring when something that is not a value identifier is used where one is expected. Example(s): none Test cases: none -} TcRnExpectedValueId :: !TcTyThing -> TcRnMessage {-| TcRnRecSelectorEscapedTyVar is an error indicating that a record field selector containing an existential type variable is used as a function rather than in a pattern match. Example(s): data Rec = forall a. Rec { field :: a } field (Rec True) Test cases: patsyn/should_fail/records-exquant typecheck/should_fail/T3176 -} TcRnRecSelectorEscapedTyVar :: !OccName -> TcRnMessage {-| TcRnPatSynNotBidirectional is an error for when a non-bidirectional pattern synonym is used as a constructor. Example(s): pattern Five :: Int pattern Five <- 5 five = Five Test cases: patsyn/should_fail/records-no-uni-update patsyn/should_fail/records-no-uni-update2 -} TcRnPatSynNotBidirectional :: !Name -> TcRnMessage {-| TcRnIllegalDerivingItem is an error for when something other than a type class appears in a deriving statement. Example(s): data X = X deriving Int Test cases: deriving/should_fail/T5922 -} TcRnIllegalDerivingItem :: !(LHsSigType GhcRn) -> TcRnMessage {-| TcRnIllegalDefaultClass is an error for when something other than a type class appears in a default declaration after the keyword. Example(s): default Integer (Int) Test cases: default/fail01 -} TcRnIllegalDefaultClass :: !(LHsSigType GhcRn) -> TcRnMessage {-| TcRnIllegalNamedDefault is an error for specifying an explicit default class name without @-XNamedDefaults@. Example(s): default Num (Integer) Test cases: default/fail02 -} TcRnIllegalNamedDefault :: !(LDefaultDecl GhcRn) -> TcRnMessage {-| TcRnUnexpectedAnnotation indicates the erroroneous use of an annotation such as strictness, laziness, or unpacking. Example(s): data T = T { t :: Maybe {-# UNPACK #-} Int } data C = C { f :: !IntMap Int } Test cases: parser/should_fail/unpack_inside_type typecheck/should_fail/T7210 rename/should_fail/T22478b -} TcRnUnexpectedAnnotation :: !(HsType GhcRn) -> !HsBang -> TcRnMessage {-| TcRnIllegalRecordSyntax is an error indicating an illegal use of record syntax. Example(s): data T = T Int { field :: Int } Test cases: rename/should_fail/T7943 rename/should_fail/T9077 rename/should_fail/T22478b -} TcRnIllegalRecordSyntax :: Either (HsType GhcPs) (HsType GhcRn) -> TcRnMessage {-| TcRnInvalidVisibleKindArgument is an error for a kind application on a target type that cannot accept it. Example(s): bad :: Int @Type bad = 1 type Foo :: forall a {b}. a -> b -> b type Foo x y = y type Bar = Foo @Bool @Int True 42 Test cases: indexed-types/should_fail/T16356_Fail3 typecheck/should_fail/ExplicitSpecificity7 typecheck/should_fail/T12045b typecheck/should_fail/T12045c typecheck/should_fail/T15592a typecheck/should_fail/T15816 -} TcRnInvalidVisibleKindArgument :: !(LHsType GhcRn) -- ^ The visible kind argument -> !Type -- ^ Target of the kind application -> TcRnMessage {-| TcRnTooManyBinders is an error for a type constructor that is declared with more arguments then its kind specifies. Example(s): type T :: Type -> (Type -> Type) -> Type data T a (b :: Type -> Type) x1 (x2 :: Type -> Type) Test cases: saks/should_fail/saks_fail008 -} TcRnTooManyBinders :: !Kind -> ![LHsTyVarBndr (HsBndrVis GhcRn) GhcRn] -> TcRnMessage {-| TcRnDifferentNamesForTyVar is an error that indicates different names being used for the same type variable. Example(s): data SameKind :: k -> k -> * data Q (a :: k1) (b :: k2) c = MkQ (SameKind a b) Test cases: polykinds/T11203 polykinds/T11821a saks/should_fail/T20916 typecheck/should_fail/T17566b typecheck/should_fail/T17566c -} TcRnDifferentNamesForTyVar :: !Name -> !Name -> TcRnMessage {-| TcRnDisconnectedTyVar is an error for a data declaration that has a kind signature, where the implicitly-bound type type variables can't be matched up unambiguously with the ones from the signature. See Note [Disconnected type variables] in GHC.Tc.Gen.HsType. Test cases: T24083 -} TcRnDisconnectedTyVar :: !Name -> TcRnMessage {-| TcRnInvalidReturnKind is an error for a data declaration that has a kind signature with an invalid result kind. Example(s): data family Foo :: Constraint Test cases: typecheck/should_fail/T14048b typecheck/should_fail/UnliftedNewtypesConstraintFamily typecheck/should_fail/T12729 typecheck/should_fail/T15883 typecheck/should_fail/T16829a typecheck/should_fail/T16829b typecheck/should_fail/UnliftedNewtypesNotEnabled typecheck/should_fail/tcfail079 -} TcRnInvalidReturnKind :: !DataSort -- ^ classification of thing being returned -> !AllowedDataResKind -- ^ allowed kind -> !Kind -- ^ the return kind -> !(Maybe SuggestUnliftedTypes) -- ^ suggested extension -> TcRnMessage {-| TcRnUnexpectedKindVar is an error that occurs when the user tries to use kind variables without -XPolyKinds. Example: f :: forall k a. Proxy (a :: k) Test cases: polykinds/BadKindVar polykinds/T14710 saks/should_fail/T16722 -} TcRnUnexpectedKindVar :: RdrName -> TcRnMessage {-| TcRnIllegalKind is used for a various illegal kinds errors including Example: type T :: forall k. Type -- without emabled -XPolyKinds Test cases: polykinds/T16762b -} TcRnIllegalKind :: HsTypeOrSigType GhcPs -- ^ The illegal kind -> Bool -- ^ Whether enabling -XPolyKinds should be suggested -> TcRnMessage {-| TcRnClassKindNotConstraint is an error for a type class that has a kind that is not equivalent to Constraint. Example(s): type C :: Type -> Type class C a Test cases: saks/should_fail/T16826 -} TcRnClassKindNotConstraint :: !Kind -> TcRnMessage {-| TcRnUnpromotableThing is an error that occurs when the user attempts to use the promoted version of something which is not promotable. Example(s): data T :: T -> * data X a where MkX :: Show a => a -> X a foo :: Proxy ('MkX 'True) foo = Proxy Test cases: dependent/should_fail/PromotedClass dependent/should_fail/T14845_fail1 dependent/should_fail/T14845_fail2 dependent/should_fail/T15215 dependent/should_fail/T13780c dependent/should_fail/T15245 polykinds/T5716 polykinds/T5716a polykinds/T6129 polykinds/T7433 patsyn/should_fail/T11265 patsyn/should_fail/T9161-1 patsyn/should_fail/T9161-2 dependent/should_fail/SelfDep polykinds/PolyKinds06 polykinds/PolyKinds07 polykinds/T13625 polykinds/T15116 polykinds/T15116a saks/should_fail/T16727a saks/should_fail/T16727b rename/should_fail/T12686 rename/should_fail/T16635a rename/should_fail/T16635b rename/should_fail/T16635c -} TcRnUnpromotableThing :: !Name -> !PromotionErr -> TcRnMessage {- | TcRnIllegalTermLevelUse is an error that occurs when the user attempts to use a type-level entity at the term-level. Examples: f x = Int -- illegal use of a type constructor g (Proxy :: Proxy a) = a -- illegal use of a type variable Note that the namespace cannot be used to determine if a name refers to a type-level entity: {-# LANGUAGE RequiredTypeArguments #-} bad :: forall (a :: k) -> k bad t = t The name `t` is assigned the `varName` namespace but stands for a type variable that cannot be used at the term level. Test cases: T18740a, T18740b, T23739_fail_ret, T23739_fail_case -} TcRnIllegalTermLevelUse :: !Name -> !TermLevelUseErr -> TcRnMessage {-| TcRnMatchesHaveDiffNumArgs is an error occurring when something has matches that have different numbers of arguments Example(s): foo x = True foo x y = False Test cases: rename/should_fail/rnfail045 typecheck/should_fail/T20768_fail -} TcRnMatchesHaveDiffNumArgs :: !HsMatchContextRn -- ^ Pattern match specifics -> !MatchArgBadMatches -> TcRnMessage {-| TcRnUnexpectedPatSigType is an error occurring when there is a type signature in a pattern without -XScopedTypeVariables extension Examples: f (a :: Bool) = ... Test case: rename/should_fail/T11663 -} TcRnUnexpectedPatSigType :: HsPatSigType GhcPs -> TcRnMessage {-| TcRnIllegalKindSignature is an error occurring when there is a kind signature without -XKindSignatures extension Examples: data Foo (a :: Nat) = .... Test case: parser/should_fail/readFail036 -} TcRnIllegalKindSignature :: HsType GhcPs -> TcRnMessage {-| TcRnDataKindsError is an error occurring when there is an illegal type or kind, probably required -XDataKinds and is used without the enabled extension. This error can occur in both the renamer and the typechecker. The field of type @'Either' ('HsType' 'GhcPs') 'Type'@ reflects this: this field will contain a 'Left' value if the error occurred in the renamer, and this field will contain a 'Right' value if the error occurred in the typechecker. Examples: type Foo = [Nat, Char] type Bar = [Int, String] Test cases: linear/should_fail/T18888 parser/should_fail/readFail001 polykinds/T7151 polykinds/T7433 rename/should_fail/T13568 rename/should_fail/T22478e th/TH_Promoted1Tuple typecheck/should_compile/tcfail094 typecheck/should_compile/T22141a typecheck/should_compile/T22141b typecheck/should_compile/T22141c typecheck/should_compile/T22141d typecheck/should_compile/T22141e typecheck/should_compile/T22141f typecheck/should_compile/T22141g typecheck/should_fail/T20873c typecheck/should_fail/T20873d -} TcRnDataKindsError :: TypeOrKind -> Either (HsType GhcPs) Type -> TcRnMessage {-| TcRnCannotBindScopedTyVarInPatSig is an error stating that scoped type variables cannot be used in pattern bindings. Example(s): let (x :: a) = 5 Test cases: typecheck/should_compile/tc141 -} TcRnCannotBindScopedTyVarInPatSig :: !(NE.NonEmpty (Name, TcTyVar)) -> TcRnMessage {-| TcRnCannotBindTyVarsInPatBind is an error for when type variables are introduced in a pattern binding Example(s): Just @a x = Just True Test cases: typecheck/should_fail/TyAppPat_PatternBinding typecheck/should_fail/TyAppPat_PatternBindingExistential -} TcRnCannotBindTyVarsInPatBind :: !(NE.NonEmpty (Name, TcTyVar)) -> TcRnMessage {-| TcRnTooManyTyArgsInConPattern is an error occurring when a constructor pattern has more than the expected number of type arguments Example(s): f (Just @Int @Bool x) = x Test cases: typecheck/should_fail/TyAppPat_TooMany typecheck/should_fail/T20443b -} TcRnTooManyTyArgsInConPattern :: !ConLike -> !Int -- ^ Expected number of args -> !Int -- ^ Actual number of args -> TcRnMessage {-| TcRnMultipleInlinePragmas is a warning signifying that multiple inline pragmas reference the same definition. Example(s): {-# INLINE foo #-} {-# INLINE foo #-} foo :: Bool -> Bool foo = id Test cases: none -} TcRnMultipleInlinePragmas :: !Id -- ^ Target of the pragmas -> !(LocatedA InlinePragma) -- ^ The first pragma -> !(NE.NonEmpty (LocatedA InlinePragma)) -- ^ Other pragmas -> TcRnMessage {-| TcRnUnexpectedPragmas is a warning that occurs when unexpected pragmas appear in the source. Example(s): Test cases: none -} TcRnUnexpectedPragmas :: !Id -> !(NE.NonEmpty (LSig GhcRn)) -> TcRnMessage {-| TcRnNonOverloadedSpecialisePragma is a warning for a specialise pragma being placed on a definition that is not overloaded. Example(s): {-# SPECIALISE foo :: Bool -> Bool #-} foo :: Bool -> Bool foo = id Test cases: simplCore/should_compile/T8537 typecheck/should_compile/T10504 -} TcRnNonOverloadedSpecialisePragma :: !(LIdP GhcRn) -> TcRnMessage {-| TcRnSpecialiseNotVisible is a warning that occurs when the subject of a SPECIALISE pragma has a definition that is not visible from the current module. Example(s): none Test cases: none -} TcRnSpecialiseNotVisible :: !Name -> TcRnMessage {-| TcRnPragmaWarning is a warning that can happen when usage of something is warned or deprecated by pragma. Test cases: DeprU T5281 T5867 rn050 rn066 (here is a warning, not deprecation) T3303 ExportWarnings1 ExportWarnings2 ExportWarnings3 ExportWarnings4 ExportWarnings5 ExportWarnings6 InstanceWarnings -} TcRnPragmaWarning :: { TcRnMessage -> PragmaWarningInfo pragma_warning_info :: PragmaWarningInfo, TcRnMessage -> WarningTxt GhcRn pragma_warning_msg :: WarningTxt GhcRn } -> TcRnMessage {-| TcRnDifferentExportWarnings is an error that occurs when the warning messages for exports of a name differ between several export items. Test case: DifferentExportWarnings -} TcRnDifferentExportWarnings :: !Name -- ^ The name with different export warnings -> NE.NonEmpty SrcSpan -- ^ The locations of export list items that differ -- from the one at which the error is reported -> TcRnMessage {-| TcRnIncompleteExportWarnings is a warning (controlled by -Wincomplete-export-warnings) that occurs when some of the exports of a name do not have an export warning and some do Test case: ExportWarnings6 -} TcRnIncompleteExportWarnings :: !Name -- ^ The name that is exported -> NE.NonEmpty SrcSpan -- ^ The locations of export list items that are -- missing the export warning -> TcRnMessage {-| TcRnIllegalHsigDefaultMethods is an error that occurs when a binding for a class default method is provided in a Backpack signature file. Test case: bkpfail40 -} TcRnIllegalHsigDefaultMethods :: !Name -- ^ 'Name' of the class -> NE.NonEmpty (LHsBind GhcRn) -- ^ default methods -> TcRnMessage {-| TcRnHsigFixityMismatch is an error indicating that the fixity decl in a Backpack signature file differs from the one in the source file for the same operator. Test cases: bkpfail37, bkpfail38 -} TcRnHsigFixityMismatch :: !TyThing -- ^ The operator whose fixity is defined -> !Fixity -- ^ the fixity used in the source file -> !Fixity -- ^ the fixity used in the signature -> TcRnMessage {-| TcRnHsigShapeMismatch is a group of errors related to mismatches between backpack signatures. -} TcRnHsigShapeMismatch :: !HsigShapeMismatchReason -> TcRnMessage {-| TcRnHsigMissingModuleExport is an error indicating that a module doesn't export a name exported by its signature. Test cases: bkpfail01, bkpfail05, bkpfail09, bkpfail16, bkpfail35, bkpcabal06 -} TcRnHsigMissingModuleExport :: !OccName -- ^ The missing name -> !UnitState -- ^ The module's unit state -> !Module -- ^ The implementation module -> TcRnMessage {-| TcRnBadGenericMethod This test ensures that if you provide a "more specific" type signatures for the default method, you must also provide a binding. Example: {-# LANGUAGE DefaultSignatures #-} class C a where meth :: a default meth :: Num a => a meth = 0 Test case: typecheck/should_fail/MissingDefaultMethodBinding.hs -} TcRnBadGenericMethod :: !Name -- ^ 'Name' of the class -> !Name -- ^ Problematic method -> TcRnMessage {-| TcRnWarningMinimalDefIncomplete is a warning that one must specify which methods must be implemented by all instances. Example: class Cheater a where -- WARNING LINE cheater :: a {-# MINIMAL #-} -- warning! Test case: warnings/minimal/WarnMinimal.hs: -} TcRnWarningMinimalDefIncomplete :: ClassMinimalDef -> TcRnMessage {-| TcRnIllegalQuasiQuotes is an error that occurs when a quasi-quote is used without the QuasiQuotes extension. Example: foo = [myQuoter|x y z|] Test cases: none; the parser fails to parse this if QuasiQuotes is off. -} TcRnIllegalQuasiQuotes :: TcRnMessage {-| TcRnTHError is a family of errors involving Template Haskell. See 'THError'. -} TcRnTHError :: THError -> TcRnMessage {-| TcRnDefaultMethodForPragmaLacksBinding is an error that occurs when a default method pragma is missing an accompanying binding. Test cases: typecheck/should_fail/T5084.hs typecheck/should_fail/T2354.hs -} TcRnDefaultMethodForPragmaLacksBinding :: Id -- ^ method -> Sig GhcRn -- ^ the pragma -> TcRnMessage {-| TcRnIgnoreSpecialisePragmaOnDefMethod is a warning that occurs when a specialise pragma is put on a default method. Test cases: none -} TcRnIgnoreSpecialisePragmaOnDefMethod :: !Name -> TcRnMessage {-| TcRnBadMethodErr is an error that happens when one attempts to provide a method in a class instance, when the class doesn't have a method by that name. Test case: th/T12387 -} TcRnBadMethodErr :: { TcRnMessage -> Name badMethodErrClassName :: !Name , TcRnMessage -> Name badMethodErrMethodName :: !Name } -> TcRnMessage {-| TcRnIllegalNewtype is an error that occurs when a newtype: * Does not have exactly one field, or * is non-linear, or * is a GADT, or * has a context in its constructor's type, or * has existential type variables in its constructor's type, or * has strictness annotations. Test cases: gadt/T14719 indexed-types/should_fail/T14033 indexed-types/should_fail/T2334A linear/should_fail/LinearGADTNewtype parser/should_fail/readFail008 polykinds/T11459 typecheck/should_fail/T15523 typecheck/should_fail/T15796 typecheck/should_fail/T17955 typecheck/should_fail/T18891a typecheck/should_fail/T21447 typecheck/should_fail/tcfail156 -} TcRnIllegalNewtype :: DataCon -> Bool -- ^ True if linear types enabled -> IllegalNewtypeReason -> TcRnMessage {-| TcRnIllegalTypeData is an error that occurs when a @type data@ declaration occurs without the TypeOperators extension. See Note [Type data declarations] Test case: type-data/should_fail/TDNoPragma -} TcRnIllegalTypeData :: TcRnMessage {-| TcRnTypeDataForbids is an error that occurs when a @type data@ declaration contains @data@ declaration features that are forbidden in a @type data@ declaration. See Note [Type data declarations] Test cases: type-data/should_fail/TDDeriving type-data/should_fail/TDRecordsGADT type-data/should_fail/TDRecordsH98 type-data/should_fail/TDStrictnessGADT type-data/should_fail/TDStrictnessH98 -} TcRnTypeDataForbids :: !TypeDataForbids -> TcRnMessage {-| TcRnOrPatBindsVariables is an error that happens when an or-pattern binds term or type variables, e.g. (A @x; B y). Test case: testsuite/tests/typecheck/should_fail/Or3 -} TcRnOrPatBindsVariables :: NE.NonEmpty (IdP GhcRn) -- ^ List of binders -> TcRnMessage {- | TcRnUnsatisfiedMinimalDef is a warning that occurs when a class instance is missing methods that are required by the minimal definition. Example: class C a where foo :: a -> a instance C () -- | foo needs to be defined here Test cases: typecheck/prog001/typecheck.prog001 typecheck/should_compile/tc126 typecheck/should_compile/T7903 typecheck/should_compile/tc116 typecheck/should_compile/tc175 typecheck/should_compile/HasKey typecheck/should_compile/tc125 typecheck/should_compile/tc078 typecheck/should_compile/tc161 typecheck/should_fail/T5051 typecheck/should_compile/T21583 backpack/should_compile/bkp47 backpack/should_fail/bkpfail25 parser/should_compile/T2245 parser/should_compile/read014 indexed-types/should_compile/Class3 indexed-types/should_compile/Simple2 indexed-types/should_fail/T7862 deriving/should_compile/deriving-1935 deriving/should_compile/T9968a deriving/should_compile/drv003 deriving/should_compile/T4966 deriving/should_compile/T14094 perf/compiler/T15304 warnings/minimal/WarnMinimal simplCore/should_compile/simpl020 deSugar/should_compile/T14546d ghci/scripts/T5820 ghci/scripts/ghci019 -} TcRnUnsatisfiedMinimalDef :: ClassMinimalDef -> TcRnMessage {-| 'TcRnMisplacedInstSig' is an error that happens when a method in a class instance is given a type signature, but the user has not enabled the @InstanceSigs@ extension. Test case: module/mod45 -} TcRnMisplacedInstSig :: Name -> (LHsSigType GhcRn) -> TcRnMessage {-| TcRnNoRebindableSyntaxRecordDot is an error triggered by an overloaded record update without RebindableSyntax enabled. Example(s): Test cases: parser/should_fail/RecordDotSyntaxFail5 -} TcRnNoRebindableSyntaxRecordDot :: TcRnMessage {-| TcRnNoFieldPunsRecordDot is an error triggered by the use of record field puns in an overloaded record update without enabling NamedFieldPuns. Example(s): print $ a{ foo.bar.baz.quux } Test cases: parser/should_fail/RecordDotSyntaxFail12 -} TcRnNoFieldPunsRecordDot :: TcRnMessage {-| TcRnIllegalStaticExpression is an error thrown when user creates a static pointer via TemplateHaskell without enabling the StaticPointers extension. Example(s): Test cases: th/T14204 -} TcRnIllegalStaticExpression :: HsExpr GhcPs -> TcRnMessage {-| TcRnListComprehensionDuplicateBinding is an error triggered by duplicate let-bindings in a list comprehension. Example(s): [ () | let a = 13 | let a = 17 ] Test cases: typecheck/should_fail/tcfail092 -} TcRnListComprehensionDuplicateBinding :: Name -> TcRnMessage {-| TcRnEmptyStmtsGroup is an error triggered by an empty list of statements in a statement block. For more information, see 'EmptyStatementGroupErrReason' Example(s): [() | then ()] do proc () -> do Test cases: rename/should_fail/RnEmptyStatementGroup1 -} TcRnEmptyStmtsGroup:: EmptyStatementGroupErrReason -> TcRnMessage {-| TcRnLastStmtNotExpr is an error caused by the last statement in a statement block not being an expression. Example(s): do x <- pure () do let x = 5 Test cases: rename/should_fail/T6060 parser/should_fail/T3811g parser/should_fail/readFail028 -} TcRnLastStmtNotExpr :: HsStmtContextRn -> UnexpectedStatement -> TcRnMessage {-| TcRnUnexpectedStatementInContext is an error when a statement appears in an unexpected context (e.g. an arrow statement appears in a list comprehension). Example(s): Test cases: parser/should_fail/readFail042 parser/should_fail/readFail038 parser/should_fail/readFail043 -} TcRnUnexpectedStatementInContext :: HsStmtContextRn -> UnexpectedStatement -> Maybe LangExt.Extension -> TcRnMessage {-| TcRnIllegalTupleSection is an error triggered by usage of a tuple section without enabling the TupleSections extension. Example(s): (5,) Test cases: rename/should_fail/rnfail056 -} TcRnIllegalTupleSection :: TcRnMessage {-| TcRnIllegalImplicitParameterBindings is an error triggered by binding an implicit parameter in an mdo block. Example(s): mdo { let { ?x = 5 }; () } Test cases: rename/should_fail/RnImplicitBindInMdoNotation -} TcRnIllegalImplicitParameterBindings :: Either (HsLocalBindsLR GhcPs GhcPs) (HsLocalBindsLR GhcRn GhcPs) -> TcRnMessage {-| TcRnSectionWithoutParentheses is an error triggered by attempting to use an operator section without parentheses. Example(s): (`head` x, ()) Test cases: rename/should_fail/T2490 rename/should_fail/T5657 -} TcRnSectionWithoutParentheses :: HsExpr GhcPs -> TcRnMessage {-| TcRnBindingOfExistingName is an error triggered by an attempt to rebind built-in syntax, punned list or tuple syntax, or a name quoted via Template Haskell. Examples: data [] data (->) $(pure [ValD (VarP 'succ) (NormalB (ConE 'True)) []]) Test cases: rename/should_fail/T14907b rename/should_fail/T22839 rename/should_fail/rnfail042 th/T13968 -} TcRnBindingOfExistingName :: RdrName -> TcRnMessage {-| TcRnMultipleFixityDecls is an error triggered by multiple fixity declarations for the same operator. Example(s): infixr 6 $$ infixl 4 $$ Test cases: rename/should_fail/RnMultipleFixityFail -} TcRnMultipleFixityDecls :: SrcSpan -> RdrName -> TcRnMessage {-| TcRnIllegalPatternSynonymDecl is an error thrown when a user defines a pattern synonyms without enabling the PatternSynonyms extension. Example: pattern O :: Int pattern O = 0 Test cases: rename/should_fail/RnPatternSynonymFail -} TcRnIllegalPatternSynonymDecl :: TcRnMessage {-| TcRnIllegalClassBinding is an error triggered by a binding in a class or instance declaration of an illegal form. Examples: class ZeroOne a where zero :: a one :: a instance ZeroOne Int where (zero,one) = (0,1) class C a where pattern P = () Test cases: module/mod48 patsyn/should_fail/T9705-1 patsyn/should_fail/T9705-2 typecheck/should_fail/tcfail021 -} TcRnIllegalClassBinding :: DeclSort -> HsBindLR GhcPs GhcPs -> TcRnMessage {-| TcRnOrphanCompletePragma is an error triggered by a {-# COMPLETE #-} pragma which does not mention any data constructors or pattern synonyms defined in the current module. Test cases: patsyn/should_fail/T13349 -} TcRnOrphanCompletePragma :: TcRnMessage {-| TcRnEmptyCase is an error thrown when a user uses a case expression with an empty list of alternatives without enabling the EmptyCase extension. Example(s): case () of Test cases: rename/should_fail/RnEmptyCaseFail -} TcRnEmptyCase :: HsMatchContextRn -> TcRnMessage {-| TcRnNonStdGuards is a warning thrown when a user uses non-standard guards (e.g. patterns in guards) without enabling the PatternGuards extension. More realistically: the user has explicitly disabled PatternGuards, as it is enabled by default with `-XHaskell2010`. Example(s): f | 5 <- 2 + 3 = ... Test cases: rename/should_compile/rn049 -} TcRnNonStdGuards :: NonStandardGuards -> TcRnMessage {-| TcRnDuplicateSigDecl is an error triggered by two or more signatures for one entity. Examples: f :: Int -> Bool f :: Int -> Bool f _ = True g x = x {-# INLINE g #-} {-# NOINLINE g #-} pattern P = () {-# COMPLETE P #-} {-# COMPLETE P #-} Test cases: module/mod68 parser/should_fail/OpaqueParseFail4 patsyn/should_fail/T12165 rename/should_fail/rnfail048 rename/should_fail/T5589 rename/should_fail/T7338 rename/should_fail/T7338a -} TcRnDuplicateSigDecl :: NE.NonEmpty (LocatedN RdrName, Sig GhcPs) -> TcRnMessage {-| TcRnMisplacedSigDecl is an error triggered by the pragma application in the wrong context, like `MINIMAL` applied to a function or `SPECIALIZE` to an instance. Example: f x = x {-# MINIMAL f #-} Test cases: rename/should_fail/T18138 warnings/minimal/WarnMinimalFail1 -} TcRnMisplacedSigDecl :: Sig GhcRn -> TcRnMessage {-| TcRnUnexpectedDefaultSig is an error thrown when a user uses default signatures without enabling the DefaultSignatures extension. Example: class C a where m :: a default m :: Num a => a m = 0 Test cases: rename/should_fail/RnDefaultSigFail -} TcRnUnexpectedDefaultSig :: Sig GhcPs -> TcRnMessage {-| TcRnDuplicateMinimalSig is an error triggered by two or more minimal signatures for one type class. Example: class C where f :: () {-# MINIMAL f #-} {-# MINIMAL f #-} Test cases: rename/should_fail/RnMultipleMinimalPragmaFail -} TcRnDuplicateMinimalSig :: LSig GhcPs -> LSig GhcPs -> [LSig GhcPs] -> TcRnMessage {-| 'TcRnIllegalInvisTyVarBndr' is an error that occurs when invisible type variable binders in type declarations are used without enabling the @TypeAbstractions@ extension. Example: {-# LANGUAGE NoTypeAbstractions #-} -- extension disabled data T @k (a :: k) @(j :: Type) (b :: j) ^^ ^^^^^^^^^^^^ Test case: T22560_fail_ext -} TcRnIllegalInvisTyVarBndr :: !(LHsTyVarBndr (HsBndrVis GhcRn) GhcRn) -> TcRnMessage {-| 'TcRnIllegalWildcardTyVarBndr' is an error that occurs when a wildcard binder is used in a type declaration without enabling the @TypeAbstractions@ extension. Example: {-# LANGUAGE NoTypeAbstractions #-} -- extension disabled type Const a _ = a ^ Test case: T23501_fail_ext -} TcRnIllegalWildcardTyVarBndr :: !(LHsTyVarBndr (HsBndrVis GhcRn) GhcRn) -> TcRnMessage {-| 'TcRnInvalidInvisTyVarBndr' is an error that occurs when an invisible type variable binder has no corresponding @forall k.@ quantifier in the standalone kind signature. Example: type P :: forall a -> Type data P @a = MkP Test cases: T22560_fail_a T22560_fail_b -} TcRnInvalidInvisTyVarBndr :: !Name -> !(LHsTyVarBndr (HsBndrVis GhcRn) GhcRn) -> TcRnMessage {-| 'TcRnInvisBndrWithoutSig' is an error triggered by attempting to use an invisible type variable binder in a type declaration without a standalone kind signature or a complete user-supplied kind. Example: data T @k (a :: k) -- No CUSK, no SAKS Test case: T22560_fail_d -} TcRnInvisBndrWithoutSig :: !Name -> !(LHsTyVarBndr (HsBndrVis GhcRn) GhcRn) -> TcRnMessage {-| TcRnDeprecatedInvisTyArgInConPat is a warning that triggers on type applications in constructor patterns when the user has not enabled '-XTypeAbstractions' but instead has enabled both '-XScopedTypeVariables' and '-XTypeApplications'. This warning is a deprecation mechanism that is scheduled until GHC 9.12. -} TcRnDeprecatedInvisTyArgInConPat :: TcRnMessage {-| TcRnUnexpectedStandaloneDerivingDecl is an error thrown when a user uses standalone deriving without enabling the StandaloneDeriving extension. Example: deriving instance Eq Foo Test cases: rename/should_fail/RnUnexpectedStandaloneDeriving -} TcRnUnexpectedStandaloneDerivingDecl :: TcRnMessage {-| TcRnUnusedVariableInRuleDecl is an error triggered by forall'd variable in rewrite rule that does not appear on left-hand side Example: {-# RULES "rule" forall a. id = id #-} Test cases: rename/should_fail/ExplicitForAllRules2 -} TcRnUnusedVariableInRuleDecl :: FastString -> Name -> TcRnMessage {-| TcRnUnexpectedStandaloneKindSig is an error thrown when a user uses standalone kind signature without enabling the StandaloneKindSignatures extension. Example: type D :: Type data D = D Test cases: saks/should_fail/saks_fail001 -} TcRnUnexpectedStandaloneKindSig :: TcRnMessage {-| TcRnIllegalRuleLhs is an error triggered by malformed left-hand side of rewrite rule Examples: {-# RULES "test" forall x. f x = x #-} {-# RULES "test" forall x. case x of = x #-} Test cases: rename/should_fail/T15659 -} TcRnIllegalRuleLhs :: RuleLhsErrReason -> FastString -- Rule name -> LHsExpr GhcRn -- Full expression -> HsExpr GhcRn -- Bad expression -> TcRnMessage {-| TcRnDuplicateRoleAnnot is an error triggered by two or more role annotations for one type Example: data D a type role D phantom type role D phantom Test cases: roles/should_fail/Roles8 -} TcRnDuplicateRoleAnnot :: NE.NonEmpty (LRoleAnnotDecl GhcPs) -> TcRnMessage {-| TcRnDuplicateKindSig is an error triggered by two or more standalone kind signatures for one type Example: type D :: Type type D :: Type data D Test cases: saks/should_fail/saks_fail002 -} TcRnDuplicateKindSig :: NE.NonEmpty (LStandaloneKindSig GhcPs) -> TcRnMessage {-| TcRnIllegalDerivStrategy is an error thrown when a user uses deriving strategy without enabling the DerivingStrategies extension or uses deriving via without enabling the DerivingVia extension. Examples: data T = T deriving stock Eq data T = T deriving via Eq T Test cases: deriving/should_fail/deriving-via-fail3 deriving/should_fail/T10598_fail4 -} TcRnIllegalDerivStrategy :: DerivStrategy GhcPs -> TcRnMessage {-| TcRnIllegalMultipleDerivClauses is an error thrown when a user uses two or more deriving clauses without enabling the DerivingStrategies extension. Example: data T = T deriving Eq deriving Ord Test cases: deriving/should_fail/T10598_fail5 -} TcRnIllegalMultipleDerivClauses :: TcRnMessage {-| TcRnNoDerivStratSpecified is a warning implied by -Wmissing-deriving-strategies and triggered by deriving without mentioning a strategy. See 'TcRnNoDerivStratSpecifiedInfo' cases for examples. Test cases: deriving/should_compile/T15798a deriving/should_compile/T15798b deriving/should_compile/T15798c deriving/should_compile/T24955a deriving/should_compile/T24955b deriving/should_compile/T24955c -} TcRnNoDerivStratSpecified :: Bool -- ^ True if DerivingStrategies is enabled -> TcRnNoDerivStratSpecifiedInfo -> TcRnMessage {-| TcRnStupidThetaInGadt is an error triggered by data contexts in GADT-style data declaration Example: data (Eq a) => D a where MkD :: D Int Test cases: rename/should_fail/RnStupidThetaInGadt -} TcRnStupidThetaInGadt :: HsDocContext -> TcRnMessage {-| TcRnShadowedTyVarNameInFamResult is an error triggered by type variable in type family result that shadows type variable from left hand side Example: type family F a b c = b Test cases: ghci/scripts/T6018ghcirnfail rename/should_fail/T6018rnfail -} TcRnShadowedTyVarNameInFamResult :: IdP GhcPs -> TcRnMessage {-| TcRnIncorrectTyVarOnRhsOfInjCond is an error caused by a situation where the left-hand side of an injectivity condition of a type family is not a variable referring to the type family result. See Note [Renaming injectivity annotation] for more details. Example: type family F a = r | a -> a Test cases: ghci/scripts/T6018ghcirnfail rename/should_fail/T6018rnfail -} TcRnIncorrectTyVarOnLhsOfInjCond :: IdP GhcRn -- Expected -> LIdP GhcPs -- Actual -> TcRnMessage {-| TcRnUnknownTyVarsOnRhsOfInjCond is an error triggered by out-of-scope type variables on the right-hand side of a of an injectivity condition of a type family Example: type family F a = res | res -> b Test cases: ghci/scripts/T6018ghcirnfail rename/should_fail/T6018rnfail -} TcRnUnknownTyVarsOnRhsOfInjCond :: [Name] -> TcRnMessage {-| TcRnLookupInstance groups several errors emitted when looking up class instances. Test cases: none -} TcRnLookupInstance :: !Class -> ![Type] -> !LookupInstanceErrReason -> TcRnMessage {-| TcRnBadlyStaged is an error that occurs when a TH binding is used in an invalid stage. Test cases: T17820d -} TcRnBadlyStaged :: !StageCheckReason -- ^ The binding being spliced. -> !Int -- ^ The binding stage. -> !Int -- ^ The stage at which the binding is used. -> TcRnMessage {-| TcRnStageRestriction is an error that occurs when a top level splice refers to a local name. Test cases: T17820, T21547, T5795, qq00[1-4], annfail0{3,4,6,9} -} TcRnStageRestriction :: !StageCheckReason -- ^ The binding being spliced. -> TcRnMessage {-| TcRnBadlyStagedWarn is a warning that occurs when a TH type binding is used in an invalid stage. Controlled by flags: - Wbadly-staged-type Test cases: T23829_timely T23829_tardy T23829_hasty -} TcRnBadlyStagedType :: !Name -- ^ The type binding being spliced. -> !Int -- ^ The binding stage. -> !Int -- ^ The stage at which the binding is used. -> TcRnMessage {-| TcRnTyThingUsedWrong is an error that occurs when a thing is used where another thing was expected. Test cases: none -} TcRnTyThingUsedWrong :: !WrongThingSort -- ^ Expected thing. -> !TcTyThing -- ^ Thing used wrongly. -> !Name -- ^ Name of the thing used wrongly. -> TcRnMessage {-| TcRnCannotDefaultKindVar is an error that occurs when attempting to use unconstrained kind variables whose type isn't @Type@, without -XPolyKinds. Test cases: T11334b -} TcRnCannotDefaultKindVar :: !TyVar -- ^ The unconstrained variable. -> !Kind -- ^ Kind of the variable. -> TcRnMessage {-| TcRnUninferrableTyVar is an error that occurs when metavariables in a type could not be defaulted. Test cases: T17301, T17562, T17567, T17567StupidTheta, T15474, T21479 -} TcRnUninferrableTyVar :: ![TyCoVar] -- ^ The variables that could not be defaulted. -> !UninferrableTyVarCtx -- ^ Description of the surrounding context. -> TcRnMessage {-| TcRnSkolemEscape is an error that occurs when type variables from an outer scope is used in a context where they should be locally scoped. Test cases: T15076, T15076b, T14880-2, T15825, T14880, T15807, T16946, T14350, T14040A, T15795, T15795a, T14552 -} TcRnSkolemEscape :: ![TcTyVar] -- ^ The variables that would escape. -> !TcTyVar -- ^ The variable that is being quantified. -> !Type -- ^ The type in which they occur. -> TcRnMessage {-| TcRnPatSynEscapedCoercion is an error indicating that a coercion escaped from a pattern synonym into a type. See Note [Coercions that escape] in GHC.Tc.TyCl.PatSyn Test cases: T14507 -} TcRnPatSynEscapedCoercion :: !Id -- ^ The pattern-bound variable -> !(NE.NonEmpty CoVar) -- ^ The escaped coercions -> TcRnMessage {-| TcRnPatSynExistentialInResult is an error indicating that the result type of a pattern synonym mentions an existential type variable. Test cases: PatSynExistential -} TcRnPatSynExistentialInResult :: !Name -- ^ The name of the pattern synonym -> !TcSigmaType -- ^ The result type -> ![TyVar] -- ^ The escaped existential variables -> TcRnMessage {-| TcRnPatSynArityMismatch is an error indicating that the number of arguments in a pattern synonym's equation differs from the number of parameters in its signature. Test cases: PatSynArity -} TcRnPatSynArityMismatch :: !Name -- ^ The name of the pattern synonym -> !Arity -- ^ The number of equation arguments -> !Arity -- ^ The difference -> TcRnMessage {-| TcRnPatSynInvalidRhs is an error group indicating that the pattern on the right hand side of a pattern synonym is invalid. Test cases: unidir, T14112 -} TcRnPatSynInvalidRhs :: !Name -- ^ The name of the pattern synonym -> !(LPat GhcRn) -- ^ The pattern -> ![LIdP GhcRn] -- ^ The LHS args -> !PatSynInvalidRhsReason -- ^ The number of equation arguments -> TcRnMessage {-| TcRnZonkerMessage is collection of errors that occur when zonking, i.e. filling in metavariables with their final values. See 'ZonkerMessage' -} TcRnZonkerMessage :: ZonkerMessage -> TcRnMessage {-| TcRnTyFamDepsDisabled is an error indicating that a type family injectivity annotation was used without enabling the extension TypeFamilyDependencies. Test cases: T11381 -} TcRnTyFamDepsDisabled :: TcRnMessage {-| TcRnAbstractClosedTyFamDecl is an error indicating that an abstract closed type family was declared in a regular source file, while it is only allowed in hs-boot files. Test cases: ClosedFam4 -} TcRnAbstractClosedTyFamDecl :: TcRnMessage {-| TcRnPartialFieldSelector is a warning indicating that a record field was not defined for all constructors of a data type. Test cases: DRFPartialFields, T7169 -} TcRnPartialFieldSelector :: !FieldLabel -- ^ The selector -> TcRnMessage {-| TcRnHasFieldResolvedIncomplete is a warning triggered when a HasField constraint is resolved for a record field for which a `getField @"field"` application might not be successful. Currently, this means that the warning is triggered when the parent data type of that record field does not have that field in all its constructors. Example(s): data T = T1 | T2 {x :: Bool} f :: HasField t "x" Bool => t -> Bool f = getField @"x" g :: T -> Bool g = f Test cases: TcIncompleteRecSel -} TcRnHasFieldResolvedIncomplete :: !Name -- ^ The selector -> ![ConLike] -- ^ The partial constructors -> !Int -- ^ The max number of constructors reported -> TcRnMessage {-| TcRnBadFieldAnnotation is an error/warning group indicating that a strictness/unpack related data type field annotation is invalid. -} TcRnBadFieldAnnotation :: !Int -- ^ The index of the field -> !DataCon -- ^ The constructor in which the field is defined -> !BadFieldAnnotationReason -- ^ The error specifics -> TcRnMessage {-| TcRnSuperclassCycle is an error indicating that a class has a superclass cycle. Test cases: mod40, tcfail027, tcfail213, tcfail216, tcfail217, T9415, T9739 -} TcRnSuperclassCycle :: !SuperclassCycle -- ^ The details of the cycle -> TcRnMessage {-| TcRnDefaultSigMismatch is an error indicating that a default method signature doesn't match the regular method signature. Test cases: T7437, T12918a, T12918b, T12151 -} TcRnDefaultSigMismatch :: !Id -- ^ The name of the method -> !Type -- ^ The type of the default signature -> TcRnMessage {-| TcRnTyFamsDisabled is an error indicating that a type family or instance was declared while the extension TypeFamilies was disabled. Test cases: TyFamsDisabled -} TcRnTyFamsDisabled :: !TyFamsDisabledReason -- ^ The name of the family or instance -> TcRnMessage {-| TcRnBadTyConTelescope is an error caused by an ill-scoped 'TyCon' kind, due to type variables being out of dependency order. Example: class C a (b :: Proxy a) (c :: Proxy b) where type T c a Test cases: BadTelescope{∅,3,4} T14066{f,g} T14887 T15591{b,c} T15743{c,d} T15764 T23252 -} TcRnBadTyConTelescope :: !TyCon -> TcRnMessage {-| TcRnTyFamResultDisabled is an error indicating that a result variable was used on a type family while the extension TypeFamilyDependencies was disabled. Test cases: T13571, T13571a -} TcRnTyFamResultDisabled :: !Name -- ^ The name of the type family -> !(LHsTyVarBndr () GhcRn) -- ^ Name of the result variable -> TcRnMessage {-| TcRnRoleValidationFailed is an error indicating that a variable was assigned an invalid role by the inference algorithm. This is only performed with -dcore-lint. -} TcRnRoleValidationFailed :: !Role -- ^ The validated role -> !RoleValidationFailedReason -- ^ The failure reason -> TcRnMessage {-| TcRnCommonFieldResultTypeMismatch is an error indicating that a sum type declares the same field name in multiple constructors, but the constructors' result types differ. Test cases: CommonFieldResultTypeMismatch -} TcRnCommonFieldResultTypeMismatch :: !DataCon -- ^ First constructor -> !DataCon -- ^ Second constructor -> !FieldLabelString -- ^ Field name -> TcRnMessage {-| TcRnCommonFieldTypeMismatch is an error indicating that a sum type declares the same field name in multiple constructors, but their types differ. Test cases: CommonFieldTypeMismatch -} TcRnCommonFieldTypeMismatch :: !DataCon -- ^ First constructor -> !DataCon -- ^ Second constructor -> !FieldLabelString -- ^ Field name -> TcRnMessage {-| TcRnClassExtensionDisabled is an error indicating that a class was declared with an extension feature while the extension was disabled. -} TcRnClassExtensionDisabled :: !Class -- ^ The class -> !DisabledClassExtension -- ^ The extension -> TcRnMessage {-| TcRnDataConParentTypeMismatch is an error indicating that a data constructor was declared with a type that doesn't match its type constructor (i.e. a GADT result type and its data name). Test cases: T7175, T13300, T14719, T18357, T18357b, gadt11, tcfail155, tcfail176 -} TcRnDataConParentTypeMismatch :: !DataCon -- ^ The data constructor -> !Type -- ^ The parent type -> TcRnMessage {-| TcRnGADTsDisabled is an error indicating that a GADT was declared while the extension GADTs was disabled. Test cases: ghci057, T9293 -} TcRnGADTsDisabled :: !Name -- ^ The name of the GADT -> TcRnMessage {-| TcRnExistentialQuantificationDisabled is an error indicating that a data constructor was declared with existential features while the extension ExistentialQuantification was disabled. Test cases: ghci057, T9293, gadtSyntaxFail001, gadtSyntaxFail002, gadtSyntaxFail003, prog006, rnfail053, T12083a -} TcRnExistentialQuantificationDisabled :: !DataCon -- ^ The constructor -> TcRnMessage {-| TcRnGADTDataContext is an error indicating that a GADT was declared with a data type context. This error is emitted in the tc, but it is also caught in the renamer. -} TcRnGADTDataContext :: !Name -- ^ The data type name -> TcRnMessage {-| TcRnMultipleConForNewtype is an error indicating that a newtype was declared with multiple constructors. This error is caught by the parser. -} TcRnMultipleConForNewtype :: !Name -- ^ The newtype name -> !Int -- ^ The number of constructors -> TcRnMessage {-| TcRnKindSignaturesDisabled is an error indicating that a kind signature was used in a data type declaration while the extension KindSignatures was disabled. Test cases: T20873c, readFail036 -} TcRnKindSignaturesDisabled :: !(Either (HsType GhcPs) (Name, HsType GhcRn)) -- ^ The data type name -> TcRnMessage {-| TcRnEmptyDataDeclsDisabled is an error indicating that a data type was declared with no constructors while the extension EmptyDataDecls was disabled. Test cases: readFail035 -} TcRnEmptyDataDeclsDisabled :: !Name -- ^ The data type name -> TcRnMessage {-| TcRnRoleMismatch is an error indicating that the role specified in an annotation differs from its inferred role. Test cases: T7253, Roles11 -} TcRnRoleMismatch :: !Name -- ^ The type variable -> !Role -- ^ The annotated role -> !Role -- ^ The inferred role -> TcRnMessage {-| TcRnRoleCountMismatch is an error indicating that the number of roles in an annotation doesn't match the number of type parameters. Test cases: Roles6 -} TcRnRoleCountMismatch :: !Int -- ^ The number of type variables -> !(LRoleAnnotDecl GhcRn) -- ^ The role annotation -> TcRnMessage {-| TcRnIllegalRoleAnnotation is an error indicating that a role annotation was attached to a decl that doesn't allow it. Test cases: Roles5 -} TcRnIllegalRoleAnnotation :: !(RoleAnnotDecl GhcRn) -- ^ The role annotation -> TcRnMessage {-| TcRnRoleAnnotationsDisabled is an error indicating that a role annotation was declared while the extension RoleAnnotations was disabled. Test cases: Roles5, TH_Roles1 -} TcRnRoleAnnotationsDisabled :: !TyCon -- ^ The annotated type -> TcRnMessage {-| TcRnIncoherentRoles is an error indicating that a role annotation for a class parameter was declared as not nominal. Test cases: T8773 -} TcRnIncoherentRoles :: !TyCon -- ^ The class tycon -> TcRnMessage {-| TcRnPrecedenceParsingError is an error caused by attempting to use operators with the same precedence in one infix expression. Example: eq :: (a ~ b ~ c) :~: () Test cases: module/mod61 parser/should_fail/readFail016 rename/should_fail/rnfail017 rename/should_fail/T9077 typecheck/should_fail/T18252a -} TcRnPrecedenceParsingError :: (OpName, Fixity) -- ^ first operator's name and fixity -> (OpName, Fixity) -- ^ second operator's name and fixity -> TcRnMessage {-| TcRnPrecedenceParsingError is an error caused by attempting to use an operator with higher precedence than the operand. Example: k = (-3 **) where (**) = const infixl 7 ** Test cases: overloadedrecflds/should_fail/T13132_duplicaterecflds parser/should_fail/readFail023 rename/should_fail/rnfail019 th/TH_unresolvedInfix2 -} TcRnSectionPrecedenceError :: (OpName, Fixity) -- ^ first operator's name and fixity -> (OpName, Fixity) -- ^ argument operator -> HsExpr GhcPs -- ^ Section -> TcRnMessage {-| TcRnTypeSynonymCycle is an error indicating that a cycle between type synonyms has occurred. Test cases: mod27, ghc-e-fail2, bkpfail29 -} TcRnTypeSynonymCycle :: !TySynCycleTyCons -- ^ The tycons involved in the cycle -> TcRnMessage {-| TcRnSelfImport is an error indicating that a module contains an import of itself. Test cases: T9032 -} TcRnSelfImport :: !ModuleName -- ^ The module -> TcRnMessage {-| TcRnNoExplicitImportList is a warning indicating that an import statement did not include an explicit import list. Test cases: T1789, T4489 -} TcRnNoExplicitImportList :: !ModuleName -- ^ The imported module -> TcRnMessage {-| TcRnSafeImportsDisabled is an error indicating that an import was declared using the @safe@ keyword while SafeHaskell wasn't active. Test cases: Mixed01 -} TcRnSafeImportsDisabled :: !ModuleName -- ^ The imported module -> TcRnMessage {-| TcRnDeprecatedModule is a warning indicating that an imported module is annotated with a warning or deprecation pragma. Test cases: DeprU -} TcRnDeprecatedModule :: !ModuleName -- ^ The imported module -> !(WarningTxt GhcRn) -- ^ The pragma data -> TcRnMessage {-| TcRnRedundantSourceImport is a warning indicating that a {-# SOURCE #-} import was used when there is no import cycle. Test cases: none -} TcRnRedundantSourceImport :: !ModuleName -- ^ The imported module -> TcRnMessage {-| TcRnImportLookup is a group of errors about bad imported names. -} TcRnImportLookup :: !ImportLookupReason -- ^ Details about the error -> TcRnMessage {-| TcRnUnusedImport is a group of errors about unused imports. -} TcRnUnusedImport :: !(ImportDecl GhcRn) -- ^ The import -> !UnusedImportReason -- ^ Details about the error -> TcRnMessage {-| TcRnDuplicateDecls is an error indicating that the same name was used for multiple declarations. Test cases: FieldSelectors, overloadedrecfldsfail03, T17965, NFSDuplicate, T9975a, TDMultiple01, mod19, mod38, mod21, mod66, mod20, TDPunning, mod18, mod22, TDMultiple02, T4127a, ghci048, T8932, rnfail015, rnfail010, rnfail011, rnfail013, rnfail002, rnfail003, rn_dup, rnfail009, T7164, rnfail043, TH_dupdecl, rnfail012 -} TcRnDuplicateDecls :: !OccName -- ^ The name of the declarations -> !(NE.NonEmpty Name) -- ^ The individual declarations -> TcRnMessage {-| TcRnPackageImportsDisabled is an error indicating that an import uses a package qualifier while the extension PackageImports was disabled. Test cases: PackageImportsDisabled -} TcRnPackageImportsDisabled :: TcRnMessage {-| TcRnIllegalDataCon is an error indicating that a data constructor was defined using a lowercase name, or a symbolic name in prefix position. Mostly caught by PsErrNotADataCon. Test cases: None -} TcRnIllegalDataCon :: !RdrName -- ^ The constructor name -> TcRnMessage {-| TcRnNestedForallsContexts is an error indicating that multiple foralls or contexts are nested/curried where this is not supported, like @∀ x. ∀ y.@ instead of @∀ x y.@. Test cases: T12087, T14320, T16114, T16394, T16427, T18191, T18240a, T18240b, T18455, T5951 -} TcRnNestedForallsContexts :: !NestedForallsContextsIn -> TcRnMessage {-| TcRnRedundantRecordWildcard is a warning indicating that a pattern uses a record wildcard even though all of the record's fields are bound explicitly. Test cases: T15957_Fail -} TcRnRedundantRecordWildcard :: TcRnMessage {-| TcRnUnusedRecordWildcard is a warning indicating that a pattern uses a record wildcard while none of the fields bound by it are used. Test cases: T15957_Fail -} TcRnUnusedRecordWildcard :: ![Name] -- ^ The names bound by the wildcard -> TcRnMessage {-| TcRnUnusedName is a warning indicating that a defined or imported name is not used in the module. Test cases: ds053, mc10, overloadedrecfldsfail05, overloadedrecfldsfail06, prog018, read014, rn040, rn041, rn047, rn063, T13839, T13839a, T13919, T17171b, T17a, T17b, T17d, T17e, T18470, T1972, t22391, t22391j, T2497, T3371, T3449, T7145b, T7336, TH_recover_warns, unused_haddock, WarningGroups, werror -} TcRnUnusedName :: !OccName -- ^ The unused name -> !UnusedNameProv -- ^ The provenance of the name -> TcRnMessage {-| TcRnQualifiedBinder is an error indicating that a qualified name was used in binding position. Test cases: mod62, rnfail021, rnfail034, rnfail039, rnfail046 -} TcRnQualifiedBinder :: !RdrName -- ^ The name used as a binder -> TcRnMessage {-| TcRnTypeApplicationsDisabled is an error indicating that a type application was used while the extension TypeApplications was disabled. Test cases: T12411, T12446, T15527, T16133, T18251c -} TcRnTypeApplicationsDisabled :: !TypeApplication -- ^ what kind of type application is it? -> TcRnMessage {-| TcRnInvalidRecordField is an error indicating that a record field was used that doesn't exist in a constructor. Test cases: T13644, T13847, T17469, T8448, T8570, tcfail083, tcfail084 -} TcRnInvalidRecordField :: !Name -- ^ The constructor name -> !FieldLabelString -- ^ The name of the field -> TcRnMessage {-| TcRnTupleTooLarge is an error indicating that the arity of a tuple exceeds mAX_TUPLE_SIZE. Test cases: T18723a, T18723b, T18723c, T6148a, T6148b, T6148c, T6148d -} TcRnTupleTooLarge :: !Int -- ^ The arity of the tuple -> TcRnMessage {-| TcRnCTupleTooLarge is an error indicating that the arity of a constraint tuple exceeds mAX_CTUPLE_SIZE. Test cases: T10451 -} TcRnCTupleTooLarge :: !Int -- ^ The arity of the constraint tuple -> TcRnMessage {-| TcRnIllegalInferredTyVars is an error indicating that some type variables were quantified as inferred (like @∀ {a}.@) in a place where this is not allowed, like in an instance declaration. Test cases: ExplicitSpecificity5, ExplicitSpecificity6, ExplicitSpecificity8, ExplicitSpecificity9 -} TcRnIllegalInferredTyVars :: !(NE.NonEmpty (HsTyVarBndr Specificity GhcPs)) -- ^ The offending type variables -> TcRnMessage {-| TcRnAmbiguousName is an error indicating that an unbound name might refer to multiple names in scope. Test cases: BootFldReexport, DRFUnused, duplicaterecfldsghci01, GHCiDRF, mod110, mod151, mod152, mod153, mod164, mod165, NoFieldSelectorsFail, overloadedrecfldsfail02, overloadedrecfldsfail04, overloadedrecfldsfail11, overloadedrecfldsfail12, overloadedrecfldsfail13, overloadedrecfldswasrunnowfail06, rnfail044, T11167_ambig, T11167_ambiguous_fixity, T13132_duplicaterecflds, T15487, T16745, T17420, T18999_NoDisambiguateRecordFields, T19397E1, T19397E2, T23010_fail, tcfail037 -} TcRnAmbiguousName :: !GlobalRdrEnv -> !RdrName -- ^ The name -> !(NE.NonEmpty GlobalRdrElt) -- ^ The possible matches -> TcRnMessage {-| TcRnBindingNameConflict is an error indicating that multiple local or top-level bindings have the same name. Test cases: dsrun006, mdofail002, mdofail003, mod23, mod24, qq006, rnfail001, rnfail004, SimpleFail6, T14114, T16110_Fail1, tcfail038, TH_spliceD1, T22478b, TyAppPat_NonlinearMultiAppPat, TyAppPat_NonlinearMultiPat, TyAppPat_NonlinearSinglePat, -} TcRnBindingNameConflict :: !RdrName -- ^ The conflicting name -> !(NE.NonEmpty SrcSpan) -- ^ The locations of the duplicates -> TcRnMessage {-| TcRnNonCanonicalDefinition is a warning indicating that an instance defines an implementation for a method that should not be defined in a way that deviates from its default implementation, for example because it has been scheduled to be absorbed into another method, like @pure@ making @return@ obsolete. Test cases: WCompatWarningsOn, WCompatWarningsOff, WCompatWarningsOnOff -} TcRnNonCanonicalDefinition :: !NonCanonicalDefinition -- ^ Specifics -> !(LHsSigType GhcRn) -- ^ The instance type -> TcRnMessage {-| TcRnImplicitImportOfPrelude is a warning, controlled by @Wimplicit-prelude@, that is triggered upon an implicit import of the @Prelude@ module. Example: {-# OPTIONS_GHC -fwarn-implicit-prelude #-} module M where {} Test case: rn055 -} TcRnImplicitImportOfPrelude :: TcRnMessage {-| TcRnMissingMain is an error that occurs when a Main module does not define a main function (named @main@ by default, but overridable with the @main-is@ command line flag). Example: module Main where {} Test cases: T414, T7765, readFail021, rnfail007, T13839b, T17171a, T16453E1, tcfail030, T19397E3, T19397E4 -} TcRnMissingMain :: !Bool -- ^ whether the module has an explicit export list -> !Module -> !OccName -- ^ the expected name of the main function -> TcRnMessage {-| TcRnGhciUnliftedBind is an error that occurs when a user attempts to bind an unlifted value in GHCi. Example (in GHCi): let a = (# 1#, 3# #) Test cases: T9140, T19035b -} TcRnGhciUnliftedBind :: !Id -> TcRnMessage {-| TcRnGhciMonadLookupFail is an error that occurs when the user sets the GHCi monad, using the GHC API 'setGHCiMonad' function, but GHC can't find which monad the user is referring to. Example: import GHC ( setGHCiMonad ) ... setGHCiMonad "NoSuchThing" Test cases: none -} TcRnGhciMonadLookupFail :: String -- ^ the textual name of the monad requested by the user -> Maybe [GlobalRdrElt] -- ^ lookup result -> TcRnMessage {-| TcRnMissingRoleAnnotation is a warning that occurs when type declaration doesn't have a role annotatiosn Controlled by flags: - Wmissing-role-annotations Test cases: T22702 -} TcRnMissingRoleAnnotation :: Name -> [Role] -> TcRnMessage {-| TcRnPatersonCondFailure is an error that occurs when an instance declaration fails to conform to the Paterson conditions. Which particular condition fails depends on the constructor of PatersonCondFailure See Note [Paterson conditions]. Test cases: T15231, tcfail157, T15316, T19187a, fd-loop, tcfail108, tcfail154, T15172, tcfail214 -} TcRnPatersonCondFailure :: PatersonCondFailure -- ^ the failed Paterson Condition -> PatersonCondFailureContext -> Type -- ^ the LHS -> Type -- ^ the RHS -> TcRnMessage {-| TcRnImplicitRhsQuantification is a warning that occurs when GHC implicitly quantifies over a type variable that occurs free on the RHS of the type declaration that is not mentioned on the LHS Example: type T = 'Nothing :: Maybe a Controlled by flags: - Wimplicit-rhs-quantification Test cases: T23510a T23510b -} TcRnImplicitRhsQuantification :: LocatedN RdrName -> TcRnMessage {-| TcRnIllformedTypePattern is an error raised when the pattern corresponding to a required type argument (visible forall) does not have a form that can be interpreted as a type pattern. Example: vfun :: forall (a :: k) -> () vfun !x = () -- ^^ -- bang-patterns not allowed as type patterns Test cases: T22326_fail_bang_pat -} TcRnIllformedTypePattern :: !(Pat GhcRn) -> TcRnMessage {-| TcRnIllegalTypePattern is an error raised when a pattern constructed with the @type@ keyword occurs in a position that does not correspond to a required type argument (visible forall). Example: case x of (type _) -> True -- the (type _) pattern is illegal here _ -> False Test cases: T22326_fail_ado T22326_fail_caseof -} TcRnIllegalTypePattern :: TcRnMessage {-| TcRnIllformedTypeArgument is an error raised when an argument that specifies a required type argument (instantiates a visible forall) does not have a form that can be interpreted as a type argument. Example: vfun :: forall (a :: k) -> () x = vfun (\_ -> _) -- ^^^^^^^^^ -- lambdas not allowed in type arguments Test cases: T22326_fail_lam_arg -} TcRnIllformedTypeArgument :: !(LHsExpr GhcRn) -> TcRnMessage {- TcRnIllegalTypeExpr is an error raised when an expression constructed with type syntax (@type@, @->@, @=>@, @forall@) occurs in a position that doesn't correspond to required type argument (visible forall). Examples: -- Not a function argument: xtop1 = type Int xtop2 = (Int -> Int) xtop3 = (forall a. a) xtop4 = ((Show Int, Eq Bool) => Unit) -- The function does not expect a type argument: xarg1 = length (type Int) xarg2 = show (Int -> Int) Test cases: T22326_fail_app T22326_fail_top T24159_type_syntax_tc_fail -} TcRnIllegalTypeExpr :: TypeSyntax -> TcRnMessage {-| TcRnInvalidDefaultedTyVar is an error raised when a defaulting plugin proposes to default a type variable that is not an unfilled metavariable Test cases: T23832_invalid -} TcRnInvalidDefaultedTyVar :: ![Ct] -- ^ The constraints passed to the plugin -> [(TcTyVar, Type)] -- ^ The plugin-proposed type variable defaults -> NE.NonEmpty TcTyVar -- ^ The invalid type variables of the proposal -> TcRnMessage {-| TcRnNamespacedWarningPragmaWithoutFlag is an error that occurs when a namespace specifier is used in {-# WARNING ... #-} or {-# DEPRECATED ... #-} pragmas without the -XExplicitNamespaces extension enabled Example: {-# LANGUAGE NoExplicitNamespaces #-} f = id {-# WARNING data f "some warning message" #-} Test cases: T24396c -} TcRnNamespacedWarningPragmaWithoutFlag :: WarnDecl GhcPs -> TcRnMessage {-| TcRnInvisPatWithNoForAll is an error raised when invisible type pattern is used without associated `forall` in types Examples: f :: Int f @t = 5 g :: [a -> a] g = [\ @t x -> x :: t] Test cases: T17694c T17594d -} TcRnInvisPatWithNoForAll :: HsTyPat GhcRn -> TcRnMessage {-| TcRnIllegalInvisibleTypePattern is an error raised when invisible type pattern is used without the TypeAbstractions extension enabled Example: {-# LANGUAGE NoTypeAbstractions #-} id :: a -> a id @t x = x Test cases: T17694b -} TcRnIllegalInvisibleTypePattern :: HsTyPat GhcPs -> TcRnMessage {-| TcRnNamespacedFixitySigWithoutFlag is an error that occurs when a namespace specifier is used in fixity signatures without the -XExplicitNamespaces extension enabled Example: {-# LANGUAGE NoExplicitNamespaces #-} f = const infixl 7 data `f` Test cases: T14032c -} TcRnNamespacedFixitySigWithoutFlag :: FixitySig GhcPs -> TcRnMessage {-| TcRnDefaultedExceptionContext is a warning that is triggered when the backward-compatibility logic solving for implicit ExceptionContext constraints fires. Test cases: DefaultExceptionContext -} TcRnDefaultedExceptionContext :: CtLoc -> TcRnMessage {-| TcRnOutOfArityTyVar is an error raised when the arity of a type synonym (as determined by the SAKS and the LHS) is insufficiently high to accommodate an implicit binding for a free variable that occurs in the outermost kind signature on the RHS of the said type synonym. Example: type SynBad :: forall k. k -> Type type SynBad = Proxy :: j -> Type Test cases: T24770a -} TcRnOutOfArityTyVar :: Name -- ^ Type synonym's name -> Name -- ^ Type variable's name -> TcRnMessage {- TcRnMisplacedInvisPat is an error raised when invisible @-pattern appears in invalid context (e.g. pattern in case of or in do-notation) or nested inside the pattern. Template Haskell seems to be the only source for this diagnostic. Examples: f (smth, $(invisP (varT (newName "blah")))) = ... g = do $(invisP (varT (newName "blah"))) <- aciton1 ... Test cases: T24557a T24557b T24557c T24557d -} TcRnMisplacedInvisPat :: HsTyPat GhcPs -> TcRnMessage {- TcRnUnexpectedTypeSyntaxInTerms is an error that occurs when type syntax is used in terms without -XRequiredTypeArguments extension enabled Examples: idVis (forall a. forall b -> (a ~ Int, b ~ Bool) => a -> b) Test cases: T24159_type_syntax_rn_fail -} TcRnUnexpectedTypeSyntaxInTerms :: TypeSyntax -> TcRnMessage deriving (forall x. TcRnMessage -> Rep TcRnMessage x) -> (forall x. Rep TcRnMessage x -> TcRnMessage) -> Generic TcRnMessage forall x. Rep TcRnMessage x -> TcRnMessage forall x. TcRnMessage -> Rep TcRnMessage x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TcRnMessage -> Rep TcRnMessage x from :: forall x. TcRnMessage -> Rep TcRnMessage x $cto :: forall x. Rep TcRnMessage x -> TcRnMessage to :: forall x. Rep TcRnMessage x -> TcRnMessage Generic ---- data ZonkerMessage where {-| ZonkerCannotDefaultConcrete is an error occurring when a concrete type variable cannot be defaulted. Test cases: T23153 -} ZonkerCannotDefaultConcrete :: !FixedRuntimeRepOrigin -> ZonkerMessage deriving (forall x. ZonkerMessage -> Rep ZonkerMessage x) -> (forall x. Rep ZonkerMessage x -> ZonkerMessage) -> Generic ZonkerMessage forall x. Rep ZonkerMessage x -> ZonkerMessage forall x. ZonkerMessage -> Rep ZonkerMessage x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. ZonkerMessage -> Rep ZonkerMessage x from :: forall x. ZonkerMessage -> Rep ZonkerMessage x $cto :: forall x. Rep ZonkerMessage x -> ZonkerMessage to :: forall x. Rep ZonkerMessage x -> ZonkerMessage Generic ---- -- | Things forbidden in @type data@ declarations. -- See Note [Type data declarations] data TypeDataForbids = TypeDataForbidsDatatypeContexts | TypeDataForbidsLabelledFields | TypeDataForbidsStrictnessAnnotations | TypeDataForbidsDerivingClauses deriving (forall x. TypeDataForbids -> Rep TypeDataForbids x) -> (forall x. Rep TypeDataForbids x -> TypeDataForbids) -> Generic TypeDataForbids forall x. Rep TypeDataForbids x -> TypeDataForbids forall x. TypeDataForbids -> Rep TypeDataForbids x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TypeDataForbids -> Rep TypeDataForbids x from :: forall x. TypeDataForbids -> Rep TypeDataForbids x $cto :: forall x. Rep TypeDataForbids x -> TypeDataForbids to :: forall x. Rep TypeDataForbids x -> TypeDataForbids Generic instance Outputable TypeDataForbids where ppr :: TypeDataForbids -> SDoc ppr TypeDataForbids TypeDataForbidsDatatypeContexts = String -> SDoc forall doc. IsLine doc => String -> doc text String "Data type contexts" ppr TypeDataForbids TypeDataForbidsLabelledFields = String -> SDoc forall doc. IsLine doc => String -> doc text String "Labelled fields" ppr TypeDataForbids TypeDataForbidsStrictnessAnnotations = String -> SDoc forall doc. IsLine doc => String -> doc text String "Strictness flags" ppr TypeDataForbids TypeDataForbidsDerivingClauses = String -> SDoc forall doc. IsLine doc => String -> doc text String "Deriving clauses" -- | Specifies which back ends can handle a requested foreign import or export type ExpectedBackends = [Backend] -- | Specifies which calling convention is unsupported on the current platform data UnsupportedCallConvention = StdCallConvUnsupported | PrimCallConvUnsupported | JavaScriptCallConvUnsupported deriving UnsupportedCallConvention -> UnsupportedCallConvention -> Bool (UnsupportedCallConvention -> UnsupportedCallConvention -> Bool) -> (UnsupportedCallConvention -> UnsupportedCallConvention -> Bool) -> Eq UnsupportedCallConvention forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: UnsupportedCallConvention -> UnsupportedCallConvention -> Bool == :: UnsupportedCallConvention -> UnsupportedCallConvention -> Bool $c/= :: UnsupportedCallConvention -> UnsupportedCallConvention -> Bool /= :: UnsupportedCallConvention -> UnsupportedCallConvention -> Bool Eq -- | Whether the error pertains to a function argument or a result. data ArgOrResult = Arg | Result -- | Which parts of a record field are affected by a particular error or warning. data RecordFieldPart = RecordFieldDecl !Name | RecordFieldConstructor !Name | RecordFieldPattern !Name | RecordFieldUpdate -- | Why did we reject a record update? data BadRecordUpdateReason -- | No constructor has all of the required fields. = NoConstructorHasAllFields { BadRecordUpdateReason -> [FieldLabelString] conflictingFields :: [FieldLabelString] } -- | There are several possible parents which have all of the required fields, -- and we weren't able to disambiguate in any way. | MultiplePossibleParents (RecSelParent, RecSelParent, [RecSelParent]) -- ^ The possible parents (at least 2) -- | We used type-directed disambiguation, but this resulted in -- an invalid parent (the type-directed parent is not among the -- parents we computed from the field labels alone). | InvalidTyConParent TyCon (NE.NonEmpty RecSelParent) deriving (forall x. BadRecordUpdateReason -> Rep BadRecordUpdateReason x) -> (forall x. Rep BadRecordUpdateReason x -> BadRecordUpdateReason) -> Generic BadRecordUpdateReason forall x. Rep BadRecordUpdateReason x -> BadRecordUpdateReason forall x. BadRecordUpdateReason -> Rep BadRecordUpdateReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. BadRecordUpdateReason -> Rep BadRecordUpdateReason x from :: forall x. BadRecordUpdateReason -> Rep BadRecordUpdateReason x $cto :: forall x. Rep BadRecordUpdateReason x -> BadRecordUpdateReason to :: forall x. Rep BadRecordUpdateReason x -> BadRecordUpdateReason Generic -- | Where a shadowed name comes from data ShadowedNameProvenance = ShadowedNameProvenanceLocal !SrcLoc -- ^ The shadowed name is local to the module | ShadowedNameProvenanceGlobal [GlobalRdrElt] -- ^ The shadowed name is global, typically imported from elsewhere. -- | In what context did we require a type to have a fixed runtime representation? -- -- Used by 'GHC.Tc.Utils.TcMType.checkTypeHasFixedRuntimeRep' for throwing -- representation polymorphism errors when validity checking. -- -- See Note [Representation polymorphism checking] in GHC.Tc.Utils.Concrete data FixedRuntimeRepProvenance -- | Data constructor fields must have a fixed runtime representation. -- -- Tests: T11734, T18534. = FixedRuntimeRepDataConField -- | Pattern synonym signature arguments must have a fixed runtime representation. -- -- Test: RepPolyPatSynArg. | FixedRuntimeRepPatSynSigArg -- | Pattern synonym signature scrutinee must have a fixed runtime representation. -- -- Test: RepPolyPatSynRes. | FixedRuntimeRepPatSynSigRes pprFixedRuntimeRepProvenance :: FixedRuntimeRepProvenance -> SDoc pprFixedRuntimeRepProvenance :: FixedRuntimeRepProvenance -> SDoc pprFixedRuntimeRepProvenance FixedRuntimeRepProvenance FixedRuntimeRepDataConField = String -> SDoc forall doc. IsLine doc => String -> doc text String "data constructor field" pprFixedRuntimeRepProvenance FixedRuntimeRepProvenance FixedRuntimeRepPatSynSigArg = String -> SDoc forall doc. IsLine doc => String -> doc text String "pattern synonym argument" pprFixedRuntimeRepProvenance FixedRuntimeRepProvenance FixedRuntimeRepPatSynSigRes = String -> SDoc forall doc. IsLine doc => String -> doc text String "pattern synonym scrutinee" -- | Why the particular illegal newtype error arose together with more -- information, if any. data IllegalNewtypeReason = DoesNotHaveSingleField !Int | IsNonLinear | IsGADT | HasConstructorContext | HasExistentialTyVar | HasStrictnessAnnotation deriving (forall x. IllegalNewtypeReason -> Rep IllegalNewtypeReason x) -> (forall x. Rep IllegalNewtypeReason x -> IllegalNewtypeReason) -> Generic IllegalNewtypeReason forall x. Rep IllegalNewtypeReason x -> IllegalNewtypeReason forall x. IllegalNewtypeReason -> Rep IllegalNewtypeReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalNewtypeReason -> Rep IllegalNewtypeReason x from :: forall x. IllegalNewtypeReason -> Rep IllegalNewtypeReason x $cto :: forall x. Rep IllegalNewtypeReason x -> IllegalNewtypeReason to :: forall x. Rep IllegalNewtypeReason x -> IllegalNewtypeReason Generic -- | Why the particular injectivity error arose together with more information, -- if any. data InjectivityErrReason = InjErrRhsBareTyVar [Type] | InjErrRhsCannotBeATypeFam | InjErrRhsOverlap | InjErrCannotInferFromRhs !TyVarSet !HasKinds !SuggestUndecidableInstances data HasKinds = YesHasKinds | NoHasKinds deriving (Int -> HasKinds -> ShowS [HasKinds] -> ShowS HasKinds -> String (Int -> HasKinds -> ShowS) -> (HasKinds -> String) -> ([HasKinds] -> ShowS) -> Show HasKinds forall a. (Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a $cshowsPrec :: Int -> HasKinds -> ShowS showsPrec :: Int -> HasKinds -> ShowS $cshow :: HasKinds -> String show :: HasKinds -> String $cshowList :: [HasKinds] -> ShowS showList :: [HasKinds] -> ShowS Show, HasKinds -> HasKinds -> Bool (HasKinds -> HasKinds -> Bool) -> (HasKinds -> HasKinds -> Bool) -> Eq HasKinds forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: HasKinds -> HasKinds -> Bool == :: HasKinds -> HasKinds -> Bool $c/= :: HasKinds -> HasKinds -> Bool /= :: HasKinds -> HasKinds -> Bool Eq) hasKinds :: Bool -> HasKinds hasKinds :: Bool -> HasKinds hasKinds Bool True = HasKinds YesHasKinds hasKinds Bool False = HasKinds NoHasKinds data SuggestUndecidableInstances = YesSuggestUndecidableInstaces | NoSuggestUndecidableInstaces deriving (Int -> SuggestUndecidableInstances -> ShowS [SuggestUndecidableInstances] -> ShowS SuggestUndecidableInstances -> String (Int -> SuggestUndecidableInstances -> ShowS) -> (SuggestUndecidableInstances -> String) -> ([SuggestUndecidableInstances] -> ShowS) -> Show SuggestUndecidableInstances forall a. (Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a $cshowsPrec :: Int -> SuggestUndecidableInstances -> ShowS showsPrec :: Int -> SuggestUndecidableInstances -> ShowS $cshow :: SuggestUndecidableInstances -> String show :: SuggestUndecidableInstances -> String $cshowList :: [SuggestUndecidableInstances] -> ShowS showList :: [SuggestUndecidableInstances] -> ShowS Show, SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool (SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool) -> (SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool) -> Eq SuggestUndecidableInstances forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool == :: SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool $c/= :: SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool /= :: SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool Eq) suggestUndecidableInstances :: Bool -> SuggestUndecidableInstances suggestUndecidableInstances :: Bool -> SuggestUndecidableInstances suggestUndecidableInstances Bool True = SuggestUndecidableInstances YesSuggestUndecidableInstaces suggestUndecidableInstances Bool False = SuggestUndecidableInstances NoSuggestUndecidableInstaces data SuggestUnliftedTypes = SuggestUnliftedNewtypes | SuggestUnliftedDatatypes -- | A description of whether something is a -- -- * @data@ or @newtype@ ('DataDeclSort') -- -- * @data instance@ or @newtype instance@ ('DataInstanceSort') -- -- * @data family@ ('DataFamilySort') -- -- At present, this data type is only consumed by 'checkDataKindSig'. data DataSort = DataDeclSort NewOrData | DataInstanceSort NewOrData | DataFamilySort ppDataSort :: DataSort -> SDoc ppDataSort :: DataSort -> SDoc ppDataSort DataSort data_sort = String -> SDoc forall doc. IsLine doc => String -> doc text (String -> SDoc) -> String -> SDoc forall a b. (a -> b) -> a -> b $ case DataSort data_sort of DataDeclSort NewOrData DataType -> String "Data type" DataDeclSort NewOrData NewType -> String "Newtype" DataInstanceSort NewOrData DataType -> String "Data instance" DataInstanceSort NewOrData NewType -> String "Newtype instance" DataSort DataFamilySort -> String "Data family" -- | Helper type used in 'checkDataKindSig'. -- -- Superficially similar to 'ContextKind', but it lacks 'AnyKind' -- and 'AnyBoxedKind', and instead of @'TheKind' liftedTypeKind@ -- provides 'LiftedKind', which is much simpler to match on and -- handle in 'isAllowedDataResKind'. data AllowedDataResKind = AnyTYPEKind | AnyBoxedKind | LiftedKind -- | A data type to describe why a variable is not closed. -- See Note [Not-closed error messages] in GHC.Tc.Gen.Expr data NotClosedReason = NotLetBoundReason | NotTypeClosed VarSet | NotClosed Name NotClosedReason data SuggestPartialTypeSignatures = YesSuggestPartialTypeSignatures | NoSuggestPartialTypeSignatures deriving (Int -> SuggestPartialTypeSignatures -> ShowS [SuggestPartialTypeSignatures] -> ShowS SuggestPartialTypeSignatures -> String (Int -> SuggestPartialTypeSignatures -> ShowS) -> (SuggestPartialTypeSignatures -> String) -> ([SuggestPartialTypeSignatures] -> ShowS) -> Show SuggestPartialTypeSignatures forall a. (Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a $cshowsPrec :: Int -> SuggestPartialTypeSignatures -> ShowS showsPrec :: Int -> SuggestPartialTypeSignatures -> ShowS $cshow :: SuggestPartialTypeSignatures -> String show :: SuggestPartialTypeSignatures -> String $cshowList :: [SuggestPartialTypeSignatures] -> ShowS showList :: [SuggestPartialTypeSignatures] -> ShowS Show, SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool (SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool) -> (SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool) -> Eq SuggestPartialTypeSignatures forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool == :: SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool $c/= :: SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool /= :: SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool Eq) suggestPartialTypeSignatures :: Bool -> SuggestPartialTypeSignatures suggestPartialTypeSignatures :: Bool -> SuggestPartialTypeSignatures suggestPartialTypeSignatures Bool True = SuggestPartialTypeSignatures YesSuggestPartialTypeSignatures suggestPartialTypeSignatures Bool False = SuggestPartialTypeSignatures NoSuggestPartialTypeSignatures data UsingGeneralizedNewtypeDeriving = YesGeneralizedNewtypeDeriving | NoGeneralizedNewtypeDeriving deriving UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool (UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool) -> (UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool) -> Eq UsingGeneralizedNewtypeDeriving forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool == :: UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool $c/= :: UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool /= :: UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool Eq usingGeneralizedNewtypeDeriving :: Bool -> UsingGeneralizedNewtypeDeriving usingGeneralizedNewtypeDeriving :: Bool -> UsingGeneralizedNewtypeDeriving usingGeneralizedNewtypeDeriving Bool True = UsingGeneralizedNewtypeDeriving YesGeneralizedNewtypeDeriving usingGeneralizedNewtypeDeriving Bool False = UsingGeneralizedNewtypeDeriving NoGeneralizedNewtypeDeriving data DeriveAnyClassEnabled = YesDeriveAnyClassEnabled | NoDeriveAnyClassEnabled deriving DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool (DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool) -> (DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool) -> Eq DeriveAnyClassEnabled forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool == :: DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool $c/= :: DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool /= :: DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool Eq deriveAnyClassEnabled :: Bool -> DeriveAnyClassEnabled deriveAnyClassEnabled :: Bool -> DeriveAnyClassEnabled deriveAnyClassEnabled Bool True = DeriveAnyClassEnabled YesDeriveAnyClassEnabled deriveAnyClassEnabled Bool False = DeriveAnyClassEnabled NoDeriveAnyClassEnabled -- | Why a particular typeclass instance couldn't be derived. data DeriveInstanceErrReason = -- | The typeclass instance is not well-kinded. DerivErrNotWellKinded !TyCon -- ^ The type constructor that occurs in -- the typeclass instance declaration. !Kind -- ^ The typeclass kind. !Int -- ^ The number of typeclass arguments that GHC -- kept. See Note [tc_args and tycon arity] in -- GHC.Tc.Deriv. -- | Generic instances can only be derived using the stock strategy -- in Safe Haskell. | DerivErrSafeHaskellGenericInst | DerivErrDerivingViaWrongKind !Kind !Type !Kind | DerivErrNoEtaReduce !Type -- ^ The instance type -- | We cannot derive instances in boot files | DerivErrBootFileFound | DerivErrDataConsNotAllInScope !TyCon -- | We cannot use GND on non-newtype types | DerivErrGNDUsedOnData -- | We cannot derive instances of nullary classes | DerivErrNullaryClasses -- | Last arg must be newtype or data application | DerivErrLastArgMustBeApp | DerivErrNoFamilyInstance !TyCon [Type] | DerivErrNotStockDeriveable !DeriveAnyClassEnabled | DerivErrHasAssociatedDatatypes !HasAssociatedDataFamInsts !AssociatedTyLastVarInKind !AssociatedTyNotParamOverLastTyVar | DerivErrNewtypeNonDeriveableClass | DerivErrCannotEtaReduceEnough !Bool -- Is eta-reduction OK? | DerivErrOnlyAnyClassDeriveable !TyCon -- ^ Type constructor for which the instance -- is requested !DeriveAnyClassEnabled -- ^ Whether or not -XDeriveAnyClass is enabled -- already. -- | Stock deriving won't work, but perhaps DeriveAnyClass will. | DerivErrNotDeriveable !DeriveAnyClassEnabled -- | The given 'PredType' is not a class. | DerivErrNotAClass !PredType -- | The given (representation of the) 'TyCon' has no -- data constructors. | DerivErrNoConstructors !TyCon | DerivErrLangExtRequired !LangExt.Extension -- | GHC simply doesn't how to how derive the input 'Class' for the given -- 'Type'. | DerivErrDunnoHowToDeriveForType !Type -- | The given 'TyCon' must be an enumeration. -- See Note [Enumeration types] in GHC.Core.TyCon | DerivErrMustBeEnumType !TyCon -- | The given 'TyCon' must have /precisely/ one constructor. | DerivErrMustHaveExactlyOneConstructor !TyCon -- | The given data type must have some parameters. | DerivErrMustHaveSomeParameters !TyCon -- | The given data type must not have a class context. | DerivErrMustNotHaveClassContext !TyCon !ThetaType -- | We couldn't derive an instance for a particular data constructor -- for a variety of reasons. | DerivErrBadConstructor !(Maybe HasWildcard) [DeriveInstanceBadConstructor] -- | We couldn't derive a 'Generic' instance for the given type for a -- variety of reasons | DerivErrGenerics [DeriveGenericsErrReason] -- | We couldn't derive an instance either because the type was not an -- enum type or because it did have more than one constructor. | DerivErrEnumOrProduct !DeriveInstanceErrReason !DeriveInstanceErrReason deriving (forall x. DeriveInstanceErrReason -> Rep DeriveInstanceErrReason x) -> (forall x. Rep DeriveInstanceErrReason x -> DeriveInstanceErrReason) -> Generic DeriveInstanceErrReason forall x. Rep DeriveInstanceErrReason x -> DeriveInstanceErrReason forall x. DeriveInstanceErrReason -> Rep DeriveInstanceErrReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. DeriveInstanceErrReason -> Rep DeriveInstanceErrReason x from :: forall x. DeriveInstanceErrReason -> Rep DeriveInstanceErrReason x $cto :: forall x. Rep DeriveInstanceErrReason x -> DeriveInstanceErrReason to :: forall x. Rep DeriveInstanceErrReason x -> DeriveInstanceErrReason Generic data DeriveInstanceBadConstructor = -- | The given 'DataCon' must be truly polymorphic in the -- last argument of the data type. DerivErrBadConExistential !DataCon -- | The given 'DataCon' must not use the type variable in a function argument" | DerivErrBadConCovariant !DataCon -- | The given 'DataCon' must not contain function types | DerivErrBadConFunTypes !DataCon -- | The given 'DataCon' must use the type variable only -- as the last argument of a data type | DerivErrBadConWrongArg !DataCon -- | The given 'DataCon' is a GADT so we cannot directly -- derive an istance for it. | DerivErrBadConIsGADT !DataCon -- | The given 'DataCon' has existentials type vars in its type. | DerivErrBadConHasExistentials !DataCon -- | The given 'DataCon' has constraints in its type. | DerivErrBadConHasConstraints !DataCon -- | The given 'DataCon' has a higher-rank type. | DerivErrBadConHasHigherRankType !DataCon data DeriveGenericsErrReason = -- | The type must not have some datatype context. DerivErrGenericsMustNotHaveDatatypeContext !TyCon -- | The data constructor must not have exotic unlifted -- or polymorphic arguments. | DerivErrGenericsMustNotHaveExoticArgs !DataCon -- | The data constructor must be a vanilla constructor. | DerivErrGenericsMustBeVanillaDataCon !DataCon -- | The type must have some type parameters. -- check (d) from Note [Requirements for deriving Generic and Rep] -- in GHC.Tc.Deriv.Generics. | DerivErrGenericsMustHaveSomeTypeParams !TyCon -- | The data constructor must not have existential arguments. | DerivErrGenericsMustNotHaveExistentials !DataCon -- | The derivation applies a type to an argument involving -- the last parameter but the applied type is not of kind * -> *. | DerivErrGenericsWrongArgKind !DataCon data HasWildcard = YesHasWildcard | NoHasWildcard deriving HasWildcard -> HasWildcard -> Bool (HasWildcard -> HasWildcard -> Bool) -> (HasWildcard -> HasWildcard -> Bool) -> Eq HasWildcard forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: HasWildcard -> HasWildcard -> Bool == :: HasWildcard -> HasWildcard -> Bool $c/= :: HasWildcard -> HasWildcard -> Bool /= :: HasWildcard -> HasWildcard -> Bool Eq hasWildcard :: Bool -> HasWildcard hasWildcard :: Bool -> HasWildcard hasWildcard Bool True = HasWildcard YesHasWildcard hasWildcard Bool False = HasWildcard NoHasWildcard -- | A context in which we don't allow anonymous wildcards. data BadAnonWildcardContext = WildcardNotLastInConstraint | ExtraConstraintWildcardNotAllowed SoleExtraConstraintWildcardAllowed | WildcardsNotAllowedAtAll -- See Note [Wildcard binders in disallowed contexts] in GHC.Hs.Type | WildcardBndrInForallTelescope | WildcardBndrInTyFamResultVar -- | Whether a sole extra-constraint wildcard is allowed, -- e.g. @_ => ..@ as opposed to @( .., _ ) => ..@. data SoleExtraConstraintWildcardAllowed = SoleExtraConstraintWildcardNotAllowed | SoleExtraConstraintWildcardAllowed -- | Why is a class instance head invalid? data IllegalInstanceHeadReason -- | An instance for an abstract class from an hs-boot or Backpack -- hsig file. -- -- Example: -- -- -- A.hs-boot -- module A where -- class C a -- -- -- B.hs -- module B where -- import {-# SOURCE #-} A -- instance C Int where -- -- -- A.hs -- module A where -- import B -- class C a where -- f :: a -- -- Test cases: typecheck/should_fail/T13068 = InstHeadAbstractClass !Class -- | An instance whose head is not a class. -- -- Examples(s): -- -- instance c -- -- instance 42 -- -- instance !Show D -- -- type C1 a = (Show (a -> Bool)) -- instance C1 Int where -- -- Test cases: typecheck/rename/T5513 -- typecheck/rename/T16385 -- parser/should_fail/T3811c -- rename/should_fail/T18240a -- polykinds/T13267 -- deriving/should_fail/T23522 | InstHeadNonClass !(Maybe TyCon) -- ^ the 'TyCon' at the head of the instance head, -- or 'Nothing' if the instance head is not even headed -- by a 'TyCon' -- | Instance head was headed by a type synonym. -- -- Example: -- type MyInt = Int -- class C a where {..} -- instance C MyInt where {..} -- -- Test cases: drvfail015, mod42, TidyClassKinds, tcfail139 | InstHeadTySynArgs -- | Instance head was not of the form @T a1 ... an@, -- where @a1, ..., an@ are all type variables or literals. -- -- Example: -- -- instance Num [Int] where {..} -- -- Test cases: mod41, mod42, tcfail044, tcfail047. | InstHeadNonTyVarArgs -- | Multi-param instance without -XMultiParamTypeClasses. -- -- Example: -- -- instance C a b where {..} -- -- Test case: IllegalMultiParamInstance | InstHeadMultiParam deriving (forall x. IllegalInstanceHeadReason -> Rep IllegalInstanceHeadReason x) -> (forall x. Rep IllegalInstanceHeadReason x -> IllegalInstanceHeadReason) -> Generic IllegalInstanceHeadReason forall x. Rep IllegalInstanceHeadReason x -> IllegalInstanceHeadReason forall x. IllegalInstanceHeadReason -> Rep IllegalInstanceHeadReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalInstanceHeadReason -> Rep IllegalInstanceHeadReason x from :: forall x. IllegalInstanceHeadReason -> Rep IllegalInstanceHeadReason x $cto :: forall x. Rep IllegalInstanceHeadReason x -> IllegalInstanceHeadReason to :: forall x. Rep IllegalInstanceHeadReason x -> IllegalInstanceHeadReason Generic -- | Why is a (type or data) family instance invalid? data IllegalFamilyInstanceReason {-| A top-level family instance for a 'TyCon' that isn't a family 'TyCon'. Example: data D a = MkD type instance D Int = Bool Test case: indexed-types/should_fail/T3092 -} = NotAFamilyTyCon !TypeOrData -- ^ was this a 'type' or a 'data' instance? !TyCon {-| A top-level (open) type family instance for a closed type family. Test cases: indexed-types/should_fail/Overlap7 indexed-types/should_fail/Overlap3 -} | NotAnOpenFamilyTyCon !TyCon {-| A family instance was declared for a family of a different kind, e.g. a data instance for a type family 'TyCon'. Test cases: T9896, SimpleFail3a -} | FamilyCategoryMismatch !TyCon -- ^ The family tycon {-| A family instance was declared with a different number of arguments than expected. See Note [Oversaturated type family equations] in "GHC.Tc.Validity". Test cases: TyFamArity1, TyFamArity2, T11136, Overlap4, AssocTyDef05, AssocTyDef06, T14110 -} | FamilyArityMismatch !TyCon -- ^ The family tycon !Arity -- ^ The right number of parameters {-| A closed type family equation used a different name than the parent family. Example: type family F a where G Int = Bool Test cases: Overlap5, T15362, T16002, T20260, T11623 -} | TyFamNameMismatch !Name -- ^ The family name !Name -- ^ The name used in the equation -- | There are out-of-scope type variables in the right-hand side -- of an associated type or data family instance. -- -- Example: -- -- instance forall a. C Int where -- data instance D Int = MkD1 a -- -- Test cases: indexed-types/should_fail/T5515, polykinds/T9574, rename/should_fail/T18021 | FamInstRHSOutOfScopeTyVars !(Maybe (TyCon, [Type], TyVarSet)) -- ^ family 'TyCon', arguments, and set of "dodgy" type variables -- See Note [Dodgy binding sites in type family instances] -- in GHC.Tc.Validity !(NE.NonEmpty Name) -- ^ the out-of-scope type variables | FamInstLHSUnusedBoundTyVars !(NE.NonEmpty InvalidFamInstQTv) -- ^ the unused bound type variables | InvalidAssoc !InvalidAssoc deriving (forall x. IllegalFamilyInstanceReason -> Rep IllegalFamilyInstanceReason x) -> (forall x. Rep IllegalFamilyInstanceReason x -> IllegalFamilyInstanceReason) -> Generic IllegalFamilyInstanceReason forall x. Rep IllegalFamilyInstanceReason x -> IllegalFamilyInstanceReason forall x. IllegalFamilyInstanceReason -> Rep IllegalFamilyInstanceReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalFamilyInstanceReason -> Rep IllegalFamilyInstanceReason x from :: forall x. IllegalFamilyInstanceReason -> Rep IllegalFamilyInstanceReason x $cto :: forall x. Rep IllegalFamilyInstanceReason x -> IllegalFamilyInstanceReason to :: forall x. Rep IllegalFamilyInstanceReason x -> IllegalFamilyInstanceReason Generic -- | A quantified type variable in a type or data family equation that -- is either not bound in any LHS patterns or not used in the RHS (or both). data InvalidFamInstQTv = InvalidFamInstQTv { InvalidFamInstQTv -> TcTyVar ifiqtv :: TcTyVar , InvalidFamInstQTv -> Bool ifiqtv_user_written :: Bool -- ^ Did the user write this type variable, or was introduced by GHC? -- For example: with @-XPolyKinds@, in @type instance forall a. F = ()@, -- we have a user-written @a@ but GHC introduces a kind variable @k@ -- as well. See #23734. , InvalidFamInstQTv -> InvalidFamInstQTvReason ifiqtv_reason :: InvalidFamInstQTvReason -- ^ For what reason was the quantified type variable invalid? } data InvalidFamInstQTvReason -- | A dodgy binder, i.e. a variable that syntactically appears in -- LHS patterns but only in non-injective positions. -- -- See Note [Dodgy binding sites in type family instances] -- in GHC.Tc.Validity. = InvalidFamInstQTvDodgy -- | A quantified type variable in a type or data family equation -- that is not bound in any LHS patterns. | InvalidFamInstQTvNotBoundInPats -- | A quantified type variable in a type or data family equation -- that is not used on the RHS. | InvalidFamInstQTvNotUsedInRHS -- The 'check_tvs' function in 'GHC.Tc.Validity.checkFamPatBinders' -- uses 'getSrcSpan', so this 'NamedThing' instance is convenient. instance NamedThing InvalidFamInstQTv where getName :: InvalidFamInstQTv -> Name getName = TcTyVar -> Name forall a. NamedThing a => a -> Name getName (TcTyVar -> Name) -> (InvalidFamInstQTv -> TcTyVar) -> InvalidFamInstQTv -> Name forall b c a. (b -> c) -> (a -> b) -> a -> c . InvalidFamInstQTv -> TcTyVar ifiqtv data InvalidAssoc -- | An invalid associated family instance. -- -- See t'InvalidAssocInstance'.Builder = InvalidAssocInstance !InvalidAssocInstance -- | An invalid associated family default declaration. -- -- See t'InvalidAssocDefault'. | InvalidAssocDefault !InvalidAssocDefault deriving (forall x. InvalidAssoc -> Rep InvalidAssoc x) -> (forall x. Rep InvalidAssoc x -> InvalidAssoc) -> Generic InvalidAssoc forall x. Rep InvalidAssoc x -> InvalidAssoc forall x. InvalidAssoc -> Rep InvalidAssoc x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. InvalidAssoc -> Rep InvalidAssoc x from :: forall x. InvalidAssoc -> Rep InvalidAssoc x $cto :: forall x. Rep InvalidAssoc x -> InvalidAssoc to :: forall x. Rep InvalidAssoc x -> InvalidAssoc Generic -- | The reason that an associated family instance was invalid. data InvalidAssocInstance -- | A class instance is missing its expected associated type/data instance. -- -- Test cases: deriving/should_compile/T14094 -- indexed-types/should_compile/Simple2 -- typecheck/should_compile/tc254 = AssocInstanceMissing !Name -- | A top-level instance for an associated family 'TyCon'. -- -- Example: -- -- class C a where { type T a } -- instance T Int = Bool -- -- Test case: indexed-types/should_fail/SimpleFail7 | AssocInstanceNotInAClass !TyCon -- | An associated type instance is provided for a class that doesn't have -- that associated type. -- -- Examples(s): -- $(do d <- instanceD (cxt []) (conT ''Eq `appT` conT ''Foo) -- [tySynInstD $ tySynEqn Nothing (conT ''Rep `appT` conT ''Foo) (conT ''Maybe)] -- return [d]) -- ======> -- instance Eq Foo where -- type Rep Foo = Maybe -- -- Test cases: th/T12387a | AssocNotInThisClass !Class !TyCon -- | An associated family instance does not mention any of the parent 'Class' -- 'TyVar's. -- -- Test cases: T2888, T9167, T12867 | AssocNoClassTyVar !Class !TyCon | AssocTyVarsDontMatch !ForAllTyFlag !TyCon -- ^ family 'TyCon' ![Type] -- ^ expected type arguments ![Type] -- ^ actual type arguments deriving (forall x. InvalidAssocInstance -> Rep InvalidAssocInstance x) -> (forall x. Rep InvalidAssocInstance x -> InvalidAssocInstance) -> Generic InvalidAssocInstance forall x. Rep InvalidAssocInstance x -> InvalidAssocInstance forall x. InvalidAssocInstance -> Rep InvalidAssocInstance x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. InvalidAssocInstance -> Rep InvalidAssocInstance x from :: forall x. InvalidAssocInstance -> Rep InvalidAssocInstance x $cto :: forall x. Rep InvalidAssocInstance x -> InvalidAssocInstance to :: forall x. Rep InvalidAssocInstance x -> InvalidAssocInstance Generic -- | The reason that an associated family default declaration was invalid. data InvalidAssocDefault -- | An associated family default declaration for something that isn't -- an associated family. = AssocDefaultNotAssoc !Name -- ^ 'Class' 'Name' !Name -- ^ 'TyCon' 'Name' -- | Multiple default declarations were given for an associated -- family instance. -- -- Test cases: none. | AssocMultipleDefaults !Name -- | Invalid arguments in an associated family instance. -- -- See t'AssocDefaultBadArgs'. | AssocDefaultBadArgs !TyCon ![Type] AssocDefaultBadArgs deriving (forall x. InvalidAssocDefault -> Rep InvalidAssocDefault x) -> (forall x. Rep InvalidAssocDefault x -> InvalidAssocDefault) -> Generic InvalidAssocDefault forall x. Rep InvalidAssocDefault x -> InvalidAssocDefault forall x. InvalidAssocDefault -> Rep InvalidAssocDefault x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. InvalidAssocDefault -> Rep InvalidAssocDefault x from :: forall x. InvalidAssocDefault -> Rep InvalidAssocDefault x $cto :: forall x. Rep InvalidAssocDefault x -> InvalidAssocDefault to :: forall x. Rep InvalidAssocDefault x -> InvalidAssocDefault Generic -- | Invalid arguments in an associated family instance declaration. data AssocDefaultBadArgs -- | An argument which isn't a type variable in an associated -- family instance default declaration. = AssocDefaultNonTyVarArg !(Type, ForAllTyFlag) -- | Duplicate occurrence of a type variable in an associated -- family instance default declaration. | AssocDefaultDuplicateTyVars !(NE.NonEmpty (TyCoVar, ForAllTyFlag)) deriving (forall x. AssocDefaultBadArgs -> Rep AssocDefaultBadArgs x) -> (forall x. Rep AssocDefaultBadArgs x -> AssocDefaultBadArgs) -> Generic AssocDefaultBadArgs forall x. Rep AssocDefaultBadArgs x -> AssocDefaultBadArgs forall x. AssocDefaultBadArgs -> Rep AssocDefaultBadArgs x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. AssocDefaultBadArgs -> Rep AssocDefaultBadArgs x from :: forall x. AssocDefaultBadArgs -> Rep AssocDefaultBadArgs x $cto :: forall x. Rep AssocDefaultBadArgs x -> AssocDefaultBadArgs to :: forall x. Rep AssocDefaultBadArgs x -> AssocDefaultBadArgs Generic -- | A type representing whether or not the input type has associated data family instances. data HasAssociatedDataFamInsts = YesHasAdfs | NoHasAdfs deriving HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool (HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool) -> (HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool) -> Eq HasAssociatedDataFamInsts forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool == :: HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool $c/= :: HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool /= :: HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool Eq hasAssociatedDataFamInsts :: Bool -> HasAssociatedDataFamInsts hasAssociatedDataFamInsts :: Bool -> HasAssociatedDataFamInsts hasAssociatedDataFamInsts Bool True = HasAssociatedDataFamInsts YesHasAdfs hasAssociatedDataFamInsts Bool False = HasAssociatedDataFamInsts NoHasAdfs -- | If 'YesAssocTyLastVarInKind', the associated type of a typeclass -- contains the last type variable of the class in a kind, which is not (yet) allowed -- by GHC. data AssociatedTyLastVarInKind = YesAssocTyLastVarInKind !TyCon -- ^ The associated type family of the class | NoAssocTyLastVarInKind deriving AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool (AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool) -> (AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool) -> Eq AssociatedTyLastVarInKind forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool == :: AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool $c/= :: AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool /= :: AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool Eq associatedTyLastVarInKind :: Maybe TyCon -> AssociatedTyLastVarInKind associatedTyLastVarInKind :: Maybe TyCon -> AssociatedTyLastVarInKind associatedTyLastVarInKind (Just TyCon tc) = TyCon -> AssociatedTyLastVarInKind YesAssocTyLastVarInKind TyCon tc associatedTyLastVarInKind Maybe TyCon Nothing = AssociatedTyLastVarInKind NoAssocTyLastVarInKind -- | If 'NoAssociatedTyNotParamOverLastTyVar', the associated type of a -- typeclass is not parameterized over the last type variable of the class data AssociatedTyNotParamOverLastTyVar = YesAssociatedTyNotParamOverLastTyVar !TyCon -- ^ The associated type family of the class | NoAssociatedTyNotParamOverLastTyVar deriving AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool (AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool) -> (AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool) -> Eq AssociatedTyNotParamOverLastTyVar forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool == :: AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool $c/= :: AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool /= :: AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool Eq associatedTyNotParamOverLastTyVar :: Maybe TyCon -> AssociatedTyNotParamOverLastTyVar associatedTyNotParamOverLastTyVar :: Maybe TyCon -> AssociatedTyNotParamOverLastTyVar associatedTyNotParamOverLastTyVar (Just TyCon tc) = TyCon -> AssociatedTyNotParamOverLastTyVar YesAssociatedTyNotParamOverLastTyVar TyCon tc associatedTyNotParamOverLastTyVar Maybe TyCon Nothing = AssociatedTyNotParamOverLastTyVar NoAssociatedTyNotParamOverLastTyVar -- | What kind of thing is missing a type signature? -- -- Used for reporting @"missing signature"@ warnings, see -- 'tcRnMissingSignature'. data MissingSignature = MissingTopLevelBindingSig Name Type | MissingPatSynSig PatSyn | MissingTyConKindSig TyCon Bool -- ^ whether -XCUSKs is enabled -- | Is the object we are dealing with exported or not? -- -- Used for reporting @"missing signature"@ warnings, see -- 'TcRnMissingSignature'. data Exported = IsNotExported | IsExported deriving Exported -> Exported -> Bool (Exported -> Exported -> Bool) -> (Exported -> Exported -> Bool) -> Eq Exported forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a $c== :: Exported -> Exported -> Bool == :: Exported -> Exported -> Bool $c/= :: Exported -> Exported -> Bool /= :: Exported -> Exported -> Bool Eq instance Outputable Exported where ppr :: Exported -> SDoc ppr Exported IsNotExported = String -> SDoc forall doc. IsLine doc => String -> doc text String "IsNotExported" ppr Exported IsExported = String -> SDoc forall doc. IsLine doc => String -> doc text String "IsExported" -- | What declarations were not allowed in an hs-boot or hsig file? data BadBootDecls = BootBindsPs !(NE.NonEmpty (LHsBindLR GhcRn GhcPs)) | BootBindsRn !(NE.NonEmpty (LHsBindLR GhcRn GhcRn)) | BootInstanceSigs !(NE.NonEmpty (LSig GhcRn)) | BootFamInst !TyCon | BootSpliceDecls !(NE.NonEmpty (LocatedA (HsUntypedSplice GhcPs))) | BootForeignDecls !(NE.NonEmpty (LForeignDecl GhcRn)) | BootDefaultDecls !(NE.NonEmpty (LDefaultDecl GhcRn)) | BootRuleDecls !(NE.NonEmpty (LRuleDecls GhcRn)) -- | A mismatch between an hs-boot or signature file and its implementing module. data BootMismatch -- | Something defined or exported by an hs-boot or signature file -- is missing from the implementing module. = MissingBootThing !Name !MissingBootThing -- | A typeclass instance is declared in the hs-boot file but -- it is not present in the implementing module. | MissingBootInstance !DFunId -- ^ the boot instance 'DFunId' -- NB: we never trigger this for hsig files, as in that case we do -- a full round of constraint solving, and a missing instance gets reported -- as an unsolved Wanted constraint with a 'InstProvidedOrigin' 'CtOrigin'. -- See GHC.Tc.Utils.Backpack.check_inst. -- | A mismatch between an hsig file and its implementing module -- in the 'Name' that a particular re-export refers to. | BadReexportedBootThing !Name !Name -- | A mismatch between the declaration of something in the hs-boot or -- signature file and its implementation, e.g. a type mismatch or -- a type family implemented as a class. | BootMismatch !TyThing -- ^ boot thing !TyThing -- ^ real thing !BootMismatchWhat deriving (forall x. BootMismatch -> Rep BootMismatch x) -> (forall x. Rep BootMismatch x -> BootMismatch) -> Generic BootMismatch forall x. Rep BootMismatch x -> BootMismatch forall x. BootMismatch -> Rep BootMismatch x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. BootMismatch -> Rep BootMismatch x from :: forall x. BootMismatch -> Rep BootMismatch x $cto :: forall x. Rep BootMismatch x -> BootMismatch to :: forall x. Rep BootMismatch x -> BootMismatch Generic -- | Something from the hs-boot or signature file is missing from the -- implementing module. data MissingBootThing -- | Something defined in the hs-boot or signature file is not defined in the -- implementing module. = MissingBootDefinition -- | Something exported by the hs-boot or signature file is not exported by the -- implementing module. | MissingBootExport deriving (forall x. MissingBootThing -> Rep MissingBootThing x) -> (forall x. Rep MissingBootThing x -> MissingBootThing) -> Generic MissingBootThing forall x. Rep MissingBootThing x -> MissingBootThing forall x. MissingBootThing -> Rep MissingBootThing x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. MissingBootThing -> Rep MissingBootThing x from :: forall x. MissingBootThing -> Rep MissingBootThing x $cto :: forall x. Rep MissingBootThing x -> MissingBootThing to :: forall x. Rep MissingBootThing x -> MissingBootThing Generic missingBootThing :: HsBootOrSig -> Name -> MissingBootThing -> TcRnMessage missingBootThing :: HsBootOrSig -> Name -> MissingBootThing -> TcRnMessage missingBootThing HsBootOrSig src Name nm MissingBootThing thing = HsBootOrSig -> BootMismatch -> TcRnMessage TcRnBootMismatch HsBootOrSig src (Name -> MissingBootThing -> BootMismatch MissingBootThing Name nm MissingBootThing thing) -- | A mismatch of two 'TyThing's between an hs-boot or signature file -- and its implementing module. data BootMismatchWhat -- | The 'Id's have different types. = BootMismatchedIdTypes !Id -- ^ boot 'Id' !Id -- ^ real 'Id' -- | Two 'TyCon's aren't compatible. | BootMismatchedTyCons !TyCon -- ^ boot 'TyCon' !TyCon -- ^ real 'TyCon' !(NE.NonEmpty BootTyConMismatch) deriving (forall x. BootMismatchWhat -> Rep BootMismatchWhat x) -> (forall x. Rep BootMismatchWhat x -> BootMismatchWhat) -> Generic BootMismatchWhat forall x. Rep BootMismatchWhat x -> BootMismatchWhat forall x. BootMismatchWhat -> Rep BootMismatchWhat x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. BootMismatchWhat -> Rep BootMismatchWhat x from :: forall x. BootMismatchWhat -> Rep BootMismatchWhat x $cto :: forall x. Rep BootMismatchWhat x -> BootMismatchWhat to :: forall x. Rep BootMismatchWhat x -> BootMismatchWhat Generic -- | An error in the implementation of an abstract datatype using -- a type synonym. data SynAbstractDataError -- | The type synony was not nullary. = SynAbsDataTySynNotNullary -- | The type synonym RHS contained invalid types, e.g. -- a type family or a forall. | SynAbstractDataInvalidRHS !(NE.NonEmpty Type) -- | Mismatched implementation of a 'TyCon' in an hs-boot or signature file. data BootTyConMismatch -- | The 'TyCon' kinds differ. = TyConKindMismatch -- | The 'TyCon' 'Role's aren't compatible. | TyConRoleMismatch !Bool -- ^ True <=> role subtype check -- | Two type synonyms have different RHSs. | TyConSynonymMismatch !Kind !Kind -- | The two 'TyCon's are of a different flavour, e.g. one is -- a data family and the other is a type family. | TyConFlavourMismatch !FamTyConFlav !FamTyConFlav -- | The equations of a type family don't match. | TyConAxiomMismatch !(BootListMismatches CoAxBranch BootAxiomBranchMismatch) -- | The type family injectivity annotations don't match. | TyConInjectivityMismatch -- | The 'TyCon's are both datatype 'TyCon's, but they have diferent 'DataCon's. | TyConMismatchedData !AlgTyConRhs !AlgTyConRhs !BootDataMismatch -- | The 'TyCon's are both 'Class' 'TyCon's, but the classes don't match. | TyConMismatchedClasses !Class !Class !BootClassMismatch -- | The 'TyCon's are something completely different. | TyConsVeryDifferent -- | An abstract 'TyCon' is implemented using a type synonym in an invalid -- manner. See 'SynAbstractDataError'. | SynAbstractData !SynAbstractDataError -- | Utility datatype to record errors when checking compatibity -- between two lists of things, e.g. class methods, associated types, -- type family equations, etc. data BootListMismatch item err -- | Different number of items. = MismatchedLength -- | The item at the given position in the list differs. | MismatchedThing !Int !item !item !err type BootListMismatches item err = NE.NonEmpty (BootListMismatch item err) data BootAxiomBranchMismatch -- | The quantified variables in an equation don't match. -- -- Example: the quantification of @a@ in -- -- @type family F a where { forall a. F a = Maybe a }@ = MismatchedAxiomBinders -- | The LHSs of an equation don't match. | MismatchedAxiomLHS -- | The RHSs of an equation don't match. | MismatchedAxiomRHS -- | A mismatch in a class, between its declaration in an hs-boot or signature -- file, and its implementation in a source Haskell file. data BootClassMismatch -- | The class methods don't match. = MismatchedMethods !(BootListMismatches ClassOpItem BootMethodMismatch) -- | The associated types don't match. | MismatchedATs !(BootListMismatches ClassATItem BootATMismatch) -- | The functional dependencies don't match. | MismatchedFunDeps -- | The superclasses don't match. | MismatchedSuperclasses -- | The @MINIMAL@ pragmas are not compatible. | MismatchedMinimalPragmas -- | A mismatch in a class method, between its declaration in an hs-boot or signature -- file, and its implementation in a source Haskell file. data BootMethodMismatch -- | The class method names are different. = MismatchedMethodNames -- | The types of a class method are different. | MismatchedMethodTypes !Type !Type -- | The default method types are not compatible. | MismatchedDefaultMethods !Bool -- ^ True <=> subtype check -- | A mismatch in an associated type of a class, between its declaration -- in an hs-boot or signature file, and its implementation in a source Haskell file. data BootATMismatch -- | Two associated types don't match. = MismatchedTyConAT !BootTyConMismatch -- | Two associated type defaults don't match. | MismatchedATDefaultType -- | A mismatch in a datatype declaration, between an hs-boot file or signature -- file and its implementing module. data BootDataMismatch -- | A datatype is implemented as a newtype or vice-versa. = MismatchedNewtypeVsData -- | The constructors don't match. | MismatchedConstructors !(BootListMismatches DataCon BootDataConMismatch) -- | The datatype contexts differ. | MismatchedDatatypeContexts -- | A mismatch in a data constrcutor, between its declaration in an hs-boot -- file or signature file, and its implementation in a source Haskell module. data BootDataConMismatch -- | The 'Name's of the 'DataCon's differ. = MismatchedDataConNames -- | The fixities of the 'DataCon's differ. | MismatchedDataConFixities -- | The strictness annotations of the 'DataCon's differ. | MismatchedDataConBangs -- | The 'DataCon's have different field labels. | MismatchedDataConFieldLabels -- | The 'DataCon's have incompatible types. | MismatchedDataConTypes -------------------------------------------------------------------------------- -- -- Errors used in GHC.Tc.Errors -- -------------------------------------------------------------------------------- {- Note [Error report] ~~~~~~~~~~~~~~~~~~~~~~ The idea is that error msgs are divided into three parts: the main msg, the context block ("In the second argument of ..."), and the relevant bindings block, which are displayed in that order, with a mark to divide them. The the main msg ('report_important') varies depending on the error in question, but context and relevant bindings are always the same, which should simplify visual parsing. See 'GHC.Tc.Errors.Types.SolverReport' and 'GHC.Tc.Errors.mkErrorReport'. -} -- | A collection of main error messages and supplementary information. -- -- In practice, we will: -- - display the important messages first, -- - then the error context (e.g. by way of a call to 'GHC.Tc.Errors.mkErrorReport'), -- - then the supplementary information (e.g. relevant bindings, valid hole fits), -- - then the hints ("Possible fix: ..."). -- -- So this is mostly just a way of making sure that the error context appears -- early on rather than at the end of the message. -- -- See Note [Error report] for details. data SolverReport = SolverReport { SolverReport -> SolverReportWithCtxt sr_important_msg :: SolverReportWithCtxt , SolverReport -> [SolverReportSupplementary] sr_supplementary :: [SolverReportSupplementary] } -- | Additional information to print in a 'SolverReport', after the -- important messages and after the error context. -- -- See Note [Error report]. data SolverReportSupplementary = SupplementaryBindings RelevantBindings | SupplementaryHoleFits ValidHoleFits | SupplementaryCts [(PredType, RealSrcSpan)] -- | A 'TcSolverReportMsg', together with context (e.g. enclosing implication constraints) -- that are needed in order to report it. data SolverReportWithCtxt = SolverReportWithCtxt { SolverReportWithCtxt -> SolverReportErrCtxt reportContext :: SolverReportErrCtxt -- ^ Context for what we wish to report. -- This can change as we enter implications, so is -- stored alongside the content. , SolverReportWithCtxt -> TcSolverReportMsg reportContent :: TcSolverReportMsg -- ^ The content of the message to report. } deriving (forall x. SolverReportWithCtxt -> Rep SolverReportWithCtxt x) -> (forall x. Rep SolverReportWithCtxt x -> SolverReportWithCtxt) -> Generic SolverReportWithCtxt forall x. Rep SolverReportWithCtxt x -> SolverReportWithCtxt forall x. SolverReportWithCtxt -> Rep SolverReportWithCtxt x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. SolverReportWithCtxt -> Rep SolverReportWithCtxt x from :: forall x. SolverReportWithCtxt -> Rep SolverReportWithCtxt x $cto :: forall x. Rep SolverReportWithCtxt x -> SolverReportWithCtxt to :: forall x. Rep SolverReportWithCtxt x -> SolverReportWithCtxt Generic -- | Context needed when reporting a 'TcSolverReportMsg', such as -- the enclosing implication constraints or whether we are deferring type errors. data SolverReportErrCtxt = CEC { SolverReportErrCtxt -> [Implication] cec_encl :: [Implication] -- ^ Enclosing implications -- (innermost first) -- ic_skols and givens are tidied, rest are not , SolverReportErrCtxt -> TidyEnv cec_tidy :: TidyEnv , SolverReportErrCtxt -> EvBindsVar cec_binds :: EvBindsVar -- ^ We make some errors (depending on cec_defer) -- into warnings, and emit evidence bindings -- into 'cec_binds' for unsolved constraints , SolverReportErrCtxt -> DiagnosticReason cec_defer_type_errors :: DiagnosticReason -- ^ Whether to defer type errors until runtime -- We might throw a warning on an error when encountering a hole, -- depending on the type of hole (expression hole, type hole, out of scope hole). -- We store the reasons for reporting a diagnostic for each type of hole. , SolverReportErrCtxt -> DiagnosticReason cec_expr_holes :: DiagnosticReason -- ^ Reason for reporting holes in expressions. , SolverReportErrCtxt -> DiagnosticReason cec_type_holes :: DiagnosticReason -- ^ Reason for reporting holes in types. , SolverReportErrCtxt -> DiagnosticReason cec_out_of_scope_holes :: DiagnosticReason -- ^ Reason for reporting out of scope holes. , SolverReportErrCtxt -> Bool cec_warn_redundant :: Bool -- ^ True <=> -Wredundant-constraints , SolverReportErrCtxt -> Bool cec_expand_syns :: Bool -- ^ True <=> -fprint-expanded-synonyms , SolverReportErrCtxt -> Bool cec_suppress :: Bool -- ^ True <=> More important errors have occurred, -- so create bindings if need be, but -- don't issue any more errors/warnings -- See Note [Suppressing error messages] } getUserGivens :: SolverReportErrCtxt -> [UserGiven] -- One item for each enclosing implication getUserGivens :: SolverReportErrCtxt -> [Implication] getUserGivens (CEC {cec_encl :: SolverReportErrCtxt -> [Implication] cec_encl = [Implication] implics}) = [Implication] -> [Implication] getUserGivensFromImplics [Implication] implics ---------------------------------------------------------------------------- -- -- ErrorItem -- ---------------------------------------------------------------------------- -- | A predicate with its arising location; used to encapsulate a constraint -- that will give rise to a diagnostic. data ErrorItem -- We could perhaps use Ct here (and indeed used to do exactly that), but -- having a separate type gives to denote errors-in-formation gives us -- a nice place to do pre-processing, such as calculating ei_suppress. -- Perhaps some day, an ErrorItem could eventually evolve to contain -- the error text (or some representation of it), so we can then have all -- the errors together when deciding which to report. = EI { ErrorItem -> Type ei_pred :: PredType -- report about this -- The ei_pred field will never be an unboxed equality with -- a (casted) tyvar on the right; this is guaranteed by the solver , ErrorItem -> Maybe TcEvDest ei_evdest :: Maybe TcEvDest -- ^ for Wanteds, where to put the evidence -- for Givens, Nothing , ErrorItem -> CtFlavour ei_flavour :: CtFlavour , ErrorItem -> CtLoc ei_loc :: CtLoc , ErrorItem -> Maybe CtIrredReason ei_m_reason :: Maybe CtIrredReason -- if this ErrorItem was made from a -- CtIrred, this stores the reason , ErrorItem -> Bool ei_suppress :: Bool -- Suppress because of Note [Wanteds rewrite Wanteds] -- in GHC.Tc.Constraint } instance Outputable ErrorItem where ppr :: ErrorItem -> SDoc ppr (EI { ei_pred :: ErrorItem -> Type ei_pred = Type pred , ei_evdest :: ErrorItem -> Maybe TcEvDest ei_evdest = Maybe TcEvDest m_evdest , ei_flavour :: ErrorItem -> CtFlavour ei_flavour = CtFlavour flav , ei_suppress :: ErrorItem -> Bool ei_suppress = Bool supp }) = SDoc pp_supp SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> CtFlavour -> SDoc forall a. Outputable a => a -> SDoc ppr CtFlavour flav SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> Maybe TcEvDest -> SDoc forall {a}. Outputable a => Maybe a -> SDoc pp_dest Maybe TcEvDest m_evdest SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> Type -> SDoc forall a. Outputable a => a -> SDoc ppr Type pred where pp_dest :: Maybe a -> SDoc pp_dest Maybe a Nothing = SDoc forall doc. IsOutput doc => doc empty pp_dest (Just a ev) = a -> SDoc forall a. Outputable a => a -> SDoc ppr a ev SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> SDoc dcolon pp_supp :: SDoc pp_supp = if Bool supp then String -> SDoc forall doc. IsLine doc => String -> doc text String "suppress:" else SDoc forall doc. IsOutput doc => doc empty errorItemOrigin :: ErrorItem -> CtOrigin errorItemOrigin :: ErrorItem -> CtOrigin errorItemOrigin = CtLoc -> CtOrigin ctLocOrigin (CtLoc -> CtOrigin) -> (ErrorItem -> CtLoc) -> ErrorItem -> CtOrigin forall b c a. (b -> c) -> (a -> b) -> a -> c . ErrorItem -> CtLoc ei_loc errorItemEqRel :: ErrorItem -> EqRel errorItemEqRel :: ErrorItem -> EqRel errorItemEqRel = Type -> EqRel predTypeEqRel (Type -> EqRel) -> (ErrorItem -> Type) -> ErrorItem -> EqRel forall b c a. (b -> c) -> (a -> b) -> a -> c . ErrorItem -> Type ei_pred errorItemCtLoc :: ErrorItem -> CtLoc errorItemCtLoc :: ErrorItem -> CtLoc errorItemCtLoc = ErrorItem -> CtLoc ei_loc errorItemPred :: ErrorItem -> PredType errorItemPred :: ErrorItem -> Type errorItemPred = ErrorItem -> Type ei_pred {- Note [discardProvCtxtGivens] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In most situations we call all enclosing implications "useful". There is one exception, and that is when the constraint that causes the error is from the "provided" context of a pattern synonym declaration: pattern Pat :: (Num a, Eq a) => Show a => a -> Maybe a -- required => provided => type pattern Pat x <- (Just x, 4) When checking the pattern RHS we must check that it does actually bind all the claimed "provided" constraints; in this case, does the pattern (Just x, 4) bind the (Show a) constraint. Answer: no! But the implication we generate for this will look like forall a. (Num a, Eq a) => [W] Show a because when checking the pattern we must make the required constraints available, since they are needed to match the pattern (in this case the literal '4' needs (Num a, Eq a)). BUT we don't want to suggest adding (Show a) to the "required" constraints of the pattern synonym, thus: pattern Pat :: (Num a, Eq a, Show a) => Show a => a -> Maybe a It would then typecheck but it's silly. We want the /pattern/ to bind the alleged "provided" constraints, Show a. So we suppress that Implication in discardProvCtxtGivens. It's painfully ad-hoc but the truth is that adding it to the "required" constraints would work. Suppressing it solves two problems. First, we never tell the user that we could not deduce a "provided" constraint from the "required" context. Second, we never give a possible fix that suggests to add a "provided" constraint to the "required" context. For example, without this distinction the above code gives a bad error message (showing both problems): error: Could not deduce (Show a) ... from the context: (Eq a) ... Possible fix: add (Show a) to the context of the signature for pattern synonym `Pat' ... -} discardProvCtxtGivens :: CtOrigin -> [UserGiven] -> [UserGiven] discardProvCtxtGivens :: CtOrigin -> [Implication] -> [Implication] discardProvCtxtGivens CtOrigin orig [Implication] givens -- See Note [discardProvCtxtGivens] | ProvCtxtOrigin (PSB {psb_id :: forall idL idR. PatSynBind idL idR -> LIdP idL psb_id = L SrcSpanAnnN _ Name name}) <- CtOrigin orig = (Implication -> Bool) -> [Implication] -> [Implication] forall a. (a -> Bool) -> [a] -> [a] filterOut (Name -> Implication -> Bool discard Name name) [Implication] givens | Bool otherwise = [Implication] givens where discard :: Name -> Implication -> Bool discard Name n (Implic { ic_info :: Implication -> SkolemInfoAnon ic_info = SigSkol (PatSynCtxt Name n') Type _ [(Name, TcTyVar)] _ }) = Name n Name -> Name -> Bool forall a. Eq a => a -> a -> Bool == Name n' discard Name _ Implication _ = Bool False -- | An error reported after constraint solving. -- This is usually, some sort of unsolved constraint error, -- but we try to be specific about the precise problem we encountered. data TcSolverReportMsg -- | Quantified variables appear out of dependency order. -- -- Example: -- -- forall (a :: k) k. ... -- -- Test cases: BadTelescope2, T16418, T16247, T16726, T18451. = BadTelescope TyVarBndrs [TyCoVar] -- | We came across a custom type error and we have decided to report it. -- -- Example: -- -- type family F a where -- F a = TypeError (Text "error") -- -- err :: F () -- err = () -- -- Test cases: CustomTypeErrors0{1,2,3,4,5}, T12104. | UserTypeError ErrorMsgType -- ^ the message to report -- | Report a Wanted constraint of the form "Unsatisfiable msg". | UnsatisfiableError ErrorMsgType -- ^ the message to report -- | We want to report an out of scope variable or a typed hole. -- See 'HoleError'. | ReportHoleError Hole HoleError -- | Cannot unify a variable, because of a type mismatch. | CannotUnifyVariable { TcSolverReportMsg -> MismatchMsg mismatchMsg :: MismatchMsg , TcSolverReportMsg -> CannotUnifyVariableReason cannotUnifyReason :: CannotUnifyVariableReason } -- | A mismatch between two types. | Mismatch { mismatchMsg :: MismatchMsg , TcSolverReportMsg -> Maybe TyVarInfo mismatchTyVarInfo :: Maybe TyVarInfo , TcSolverReportMsg -> [AmbiguityInfo] mismatchAmbiguityInfo :: [AmbiguityInfo] , TcSolverReportMsg -> Maybe CoercibleMsg mismatchCoercibleInfo :: Maybe CoercibleMsg } -- | A violation of the representation-polymorphism invariants. -- -- See 'FixedRuntimeRepErrorInfo' and 'FixedRuntimeRepContext' for more information. | FixedRuntimeRepError [FixedRuntimeRepErrorInfo] -- | An equality between two types is blocked on a kind equality -- between their kinds. -- -- Test cases: none. | BlockedEquality ErrorItem -- These are for the "blocked" equalities, as described in -- Note [Equalities with incompatible kinds] in GHC.Tc.Solver.Equality, -- wrinkle (EIK2). There should always be another unsolved wanted around, -- which will ordinarily suppress this message. But this can still be printed out -- with -fdefer-type-errors (sigh), so we must produce a message. -- | Something was not applied to sufficiently many arguments. -- -- Example: -- -- instance Eq Maybe where {..} -- -- Test case: T11563. | ExpectingMoreArguments Int TypedThing -- | Trying to use an unbound implicit parameter. -- -- Example: -- -- foo :: Int -- foo = ?param -- -- Test case: tcfail130. | UnboundImplicitParams (NE.NonEmpty ErrorItem) -- | A constraint couldn't be solved because it contains -- ambiguous type variables. -- -- Example: -- -- class C a b where -- f :: (a,b) -- -- x = fst f -- -- -- Test case: T4921. | AmbiguityPreventsSolvingCt ErrorItem -- ^ always a class constraint ([TyVar], [TyVar]) -- ^ ambiguous kind and type variables, respectively -- | Could not solve a constraint; there were several unifying candidate instances -- but no matching instances. This is used to report as much useful information -- as possible about why we couldn't choose any instance, e.g. because of -- ambiguous type variables. | CannotResolveInstance { TcSolverReportMsg -> ErrorItem cannotResolve_item :: ErrorItem , TcSolverReportMsg -> [ClsInst] cannotResolve_unifiers :: [ClsInst] , TcSolverReportMsg -> [ClsInst] cannotResolve_candidates :: [ClsInst] , TcSolverReportMsg -> [ImportError] cannotResolve_importErrors :: [ImportError] , TcSolverReportMsg -> [GhcHint] cannotResolve_suggestions :: [GhcHint] , TcSolverReportMsg -> RelevantBindings cannotResolve_relevant_bindings :: RelevantBindings } -- TODO: remove the fields of type [GhcHint] and RelevantBindings, -- in order to handle them uniformly with other diagnostic messages. -- | Could not solve a constraint using available instances -- because the instances overlap. -- -- Test cases: tcfail118, tcfail121, tcfail218. | OverlappingInstances { TcSolverReportMsg -> ErrorItem overlappingInstances_item :: ErrorItem , TcSolverReportMsg -> NonEmpty ClsInst overlappingInstances_matches :: NE.NonEmpty ClsInst , TcSolverReportMsg -> [ClsInst] overlappingInstances_unifiers :: [ClsInst] } -- | Could not solve a constraint from instances because -- instances declared in a Safe module cannot overlap instances -- from other modules (with -XSafeHaskell). -- -- Test cases: SH_Overlap{1,2,5,6,7,11}. | UnsafeOverlap { TcSolverReportMsg -> ErrorItem unsafeOverlap_item :: ErrorItem , TcSolverReportMsg -> ClsInst unsafeOverlap_match :: ClsInst , TcSolverReportMsg -> NonEmpty ClsInst unsafeOverlapped :: NE.NonEmpty ClsInst } | MultiplicityCoercionsNotSupported deriving (forall x. TcSolverReportMsg -> Rep TcSolverReportMsg x) -> (forall x. Rep TcSolverReportMsg x -> TcSolverReportMsg) -> Generic TcSolverReportMsg forall x. Rep TcSolverReportMsg x -> TcSolverReportMsg forall x. TcSolverReportMsg -> Rep TcSolverReportMsg x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TcSolverReportMsg -> Rep TcSolverReportMsg x from :: forall x. TcSolverReportMsg -> Rep TcSolverReportMsg x $cto :: forall x. Rep TcSolverReportMsg x -> TcSolverReportMsg to :: forall x. Rep TcSolverReportMsg x -> TcSolverReportMsg Generic data MismatchMsg = -- | Couldn't unify two types or kinds. -- -- Example: -- -- 3 + 3# -- can't match a lifted type with an unlifted type -- -- Test cases: T1396, T8263, ... BasicMismatch { MismatchMsg -> MismatchEA mismatch_ea :: MismatchEA -- ^ Should this be phrased in terms of expected vs actual? , MismatchMsg -> ErrorItem mismatch_item :: ErrorItem -- ^ The constraint in which the mismatch originated. , MismatchMsg -> Type mismatch_ty1 :: Type -- ^ First type (the expected type if if mismatch_ea is True) , MismatchMsg -> Type mismatch_ty2 :: Type -- ^ Second type (the actual type if mismatch_ea is True) , MismatchMsg -> Maybe WhenMatching mismatch_whenMatching :: Maybe WhenMatching , MismatchMsg -> Maybe SameOccInfo mismatch_mb_same_occ :: Maybe SameOccInfo } -- | A type has an unexpected kind. -- -- Test cases: T2994, T7609, ... | KindMismatch { MismatchMsg -> TypedThing kmismatch_what :: TypedThing -- ^ What thing is 'kmismatch_actual' the kind of? , MismatchMsg -> Type kmismatch_expected :: Type , MismatchMsg -> Type kmismatch_actual :: Type } -- TODO: combine with 'BasicMismatch'. -- | A mismatch between two types, which arose from a type equality. -- -- Test cases: T1470, tcfail212. | TypeEqMismatch { MismatchMsg -> ErrorItem teq_mismatch_item :: ErrorItem , MismatchMsg -> Type teq_mismatch_ty1 :: Type , MismatchMsg -> Type teq_mismatch_ty2 :: Type , MismatchMsg -> Type teq_mismatch_expected :: Type -- ^ The overall expected type , MismatchMsg -> Type teq_mismatch_actual :: Type -- ^ The overall actual type , MismatchMsg -> Maybe TypedThing teq_mismatch_what :: Maybe TypedThing -- ^ What thing is 'teq_mismatch_actual' the kind of? , MismatchMsg -> Maybe SameOccInfo teq_mb_same_occ :: Maybe SameOccInfo } -- TODO: combine with 'BasicMismatch'. -- | Couldn't solve some Wanted constraints using the Givens. -- Used for messages such as @"No instance for ..."@ and -- @"Could not deduce ... from"@. | CouldNotDeduce { MismatchMsg -> [Implication] cnd_user_givens :: [Implication] -- | The Wanted constraints we couldn't solve. -- -- N.B.: the 'ErrorItem' at the head of the list has been tidied, -- perhaps not the others. , MismatchMsg -> NonEmpty ErrorItem cnd_wanted :: NE.NonEmpty ErrorItem -- | Some additional info consumed by 'mk_supplementary_ea_msg'. , MismatchMsg -> Maybe CND_Extra cnd_extra :: Maybe CND_Extra } deriving (forall x. MismatchMsg -> Rep MismatchMsg x) -> (forall x. Rep MismatchMsg x -> MismatchMsg) -> Generic MismatchMsg forall x. Rep MismatchMsg x -> MismatchMsg forall x. MismatchMsg -> Rep MismatchMsg x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. MismatchMsg -> Rep MismatchMsg x from :: forall x. MismatchMsg -> Rep MismatchMsg x $cto :: forall x. Rep MismatchMsg x -> MismatchMsg to :: forall x. Rep MismatchMsg x -> MismatchMsg Generic -- | Construct a basic mismatch message between two types. -- -- See 'pprMismatchMsg' for how such a message is displayed to users. mkBasicMismatchMsg :: MismatchEA -> ErrorItem -> Type -> Type -> MismatchMsg mkBasicMismatchMsg :: MismatchEA -> ErrorItem -> Type -> Type -> MismatchMsg mkBasicMismatchMsg MismatchEA ea ErrorItem item Type ty1 Type ty2 = BasicMismatch { mismatch_ea :: MismatchEA mismatch_ea = MismatchEA ea , mismatch_item :: ErrorItem mismatch_item = ErrorItem item , mismatch_ty1 :: Type mismatch_ty1 = Type ty1 , mismatch_ty2 :: Type mismatch_ty2 = Type ty2 , mismatch_whenMatching :: Maybe WhenMatching mismatch_whenMatching = Maybe WhenMatching forall a. Maybe a Nothing , mismatch_mb_same_occ :: Maybe SameOccInfo mismatch_mb_same_occ = Maybe SameOccInfo forall a. Maybe a Nothing } -- | Whether to use expected/actual in a type mismatch message. data MismatchEA -- | Don't use expected/actual. = NoEA -- | Use expected/actual. | EA { MismatchEA -> Maybe ExpectedActualInfo mismatch_mbEA :: Maybe ExpectedActualInfo -- ^ Whether to also mention type synonym expansion. } data CannotUnifyVariableReason = -- | A type equality between a type variable and a polytype. -- -- Test cases: T12427a, T2846b, T10194, ... CannotUnifyWithPolytype ErrorItem TyVar Type (Maybe TyVarInfo) -- | An occurs check. | OccursCheck { CannotUnifyVariableReason -> [TcTyVar] occursCheckInterestingTyVars :: [TyVar] , CannotUnifyVariableReason -> [AmbiguityInfo] occursCheckAmbiguityInfos :: [AmbiguityInfo] } -- | A skolem type variable escapes its scope. -- -- Example: -- -- data Ex where { MkEx :: a -> MkEx } -- foo (MkEx x) = x -- -- Test cases: TypeSkolEscape, T11142. | SkolemEscape ErrorItem Implication [TyVar] -- | Can't unify the type variable with the other type -- due to the kind of type variable it is. -- -- For example, trying to unify a 'SkolemTv' with the -- type Int, or with a 'TyVarTv'. | DifferentTyVars TyVarInfo | RepresentationalEq TyVarInfo (Maybe CoercibleMsg) deriving (forall x. CannotUnifyVariableReason -> Rep CannotUnifyVariableReason x) -> (forall x. Rep CannotUnifyVariableReason x -> CannotUnifyVariableReason) -> Generic CannotUnifyVariableReason forall x. Rep CannotUnifyVariableReason x -> CannotUnifyVariableReason forall x. CannotUnifyVariableReason -> Rep CannotUnifyVariableReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. CannotUnifyVariableReason -> Rep CannotUnifyVariableReason x from :: forall x. CannotUnifyVariableReason -> Rep CannotUnifyVariableReason x $cto :: forall x. Rep CannotUnifyVariableReason x -> CannotUnifyVariableReason to :: forall x. Rep CannotUnifyVariableReason x -> CannotUnifyVariableReason Generic -- | Report a mismatch error without any extra -- information. mkPlainMismatchMsg :: MismatchMsg -> TcSolverReportMsg mkPlainMismatchMsg :: MismatchMsg -> TcSolverReportMsg mkPlainMismatchMsg MismatchMsg msg = Mismatch { mismatchMsg :: MismatchMsg mismatchMsg = MismatchMsg msg , mismatchTyVarInfo :: Maybe TyVarInfo mismatchTyVarInfo = Maybe TyVarInfo forall a. Maybe a Nothing , mismatchAmbiguityInfo :: [AmbiguityInfo] mismatchAmbiguityInfo = [] , mismatchCoercibleInfo :: Maybe CoercibleMsg mismatchCoercibleInfo = Maybe CoercibleMsg forall a. Maybe a Nothing } -- | Additional information to be given in a 'CouldNotDeduce' message, -- which is then passed on to 'mk_supplementary_ea_msg'. data CND_Extra = CND_Extra TypeOrKind Type Type -- | A cue to print out information about type variables, -- e.g. where they were bound, when there is a mismatch @tv1 ~ ty2@. data TyVarInfo = TyVarInfo { TyVarInfo -> TcTyVar thisTyVar :: TyVar , TyVarInfo -> Maybe Implication thisTyVarIsUntouchable :: Maybe Implication , TyVarInfo -> Maybe TcTyVar otherTy :: Maybe TyVar } -- | Add some information to disambiguate errors in which -- two 'Names' would otherwise appear to be identical. -- -- See Note [Disambiguating (X ~ X) errors]. data SameOccInfo = SameOcc { SameOccInfo -> Bool sameOcc_same_pkg :: Bool -- ^ Whether the two 'Name's also came from the same package. , SameOccInfo -> Name sameOcc_lhs :: Name , SameOccInfo -> Name sameOcc_rhs :: Name } -- | Add some information about ambiguity data AmbiguityInfo -- | Some type variables remained ambiguous: print them to the user. = Ambiguity { AmbiguityInfo -> Bool lead_with_ambig_msg :: Bool -- ^ True <=> start the message with "Ambiguous type variable ..." -- False <=> create a message of the form "The type variable is ambiguous." , AmbiguityInfo -> ([TcTyVar], [TcTyVar]) ambig_tyvars :: ([TyVar], [TyVar]) -- ^ Ambiguous kind and type variables, respectively. -- Guaranteed to not both be empty. } -- | Remind the user that a particular type family is not injective. | NonInjectiveTyFam TyCon -- | Expected/actual information. data ExpectedActualInfo -- | Display the expected and actual types. = ExpectedActual { ExpectedActualInfo -> Type ea_expected, ExpectedActualInfo -> Type ea_actual :: Type } -- | Display the expected and actual types, after expanding type synonyms. | ExpectedActualAfterTySynExpansion { ExpectedActualInfo -> Type ea_expanded_expected, ExpectedActualInfo -> Type ea_expanded_actual :: Type } -- | Explain how a kind equality originated. data WhenMatching = WhenMatching TcType TcType CtOrigin (Maybe TypeOrKind) deriving (forall x. WhenMatching -> Rep WhenMatching x) -> (forall x. Rep WhenMatching x -> WhenMatching) -> Generic WhenMatching forall x. Rep WhenMatching x -> WhenMatching forall x. WhenMatching -> Rep WhenMatching x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. WhenMatching -> Rep WhenMatching x from :: forall x. WhenMatching -> Rep WhenMatching x $cto :: forall x. Rep WhenMatching x -> WhenMatching to :: forall x. Rep WhenMatching x -> WhenMatching Generic data BadImportKind -- | Module does not export... = BadImportNotExported [GhcHint] -- ^ suggestions for what might have been meant -- | Missing @type@ keyword when importing a type. -- e.g. `import TypeLits( (+) )`, where TypeLits exports a /type/ (+), not a /term/ (+) -- Then we want to suggest using `import TypeLits( type (+) )` | BadImportAvailTyCon Bool -- ^ is ExplicitNamespaces enabled? -- | Trying to import a data constructor directly, e.g. -- @import Data.Maybe (Just)@ instead of @import Data.Maybe (Maybe(Just))@ | BadImportAvailDataCon OccName -- | The parent does not export the given children. | BadImportNotExportedSubordinates [OccName] -- | Incorrect @type@ keyword when importing something which isn't a type. | BadImportAvailVar deriving (forall x. BadImportKind -> Rep BadImportKind x) -> (forall x. Rep BadImportKind x -> BadImportKind) -> Generic BadImportKind forall x. Rep BadImportKind x -> BadImportKind forall x. BadImportKind -> Rep BadImportKind x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. BadImportKind -> Rep BadImportKind x from :: forall x. BadImportKind -> Rep BadImportKind x $cto :: forall x. Rep BadImportKind x -> BadImportKind to :: forall x. Rep BadImportKind x -> BadImportKind Generic -- | Some form of @"not in scope"@ error. See also the 'OutOfScopeHole' -- constructor of 'HoleError'. data NotInScopeError -- | A run-of-the-mill @"not in scope"@ error. = NotInScope -- | Like 'NotInScope', but when we know we are looking for a -- record field. | NotARecordField -- | An exact 'Name' was not in scope. -- -- This usually indicates a problem with a Template Haskell splice. -- -- Test cases: T5971, T18263. | NoExactName Name -- The same exact 'Name' occurs in multiple name-spaces. -- -- This usually indicates a problem with a Template Haskell splice. -- -- Test case: T7241. | SameName [GlobalRdrElt] -- ^ always at least 2 elements -- A type signature, fixity declaration, pragma, standalone kind signature... -- is missing an associated binding. | MissingBinding SDoc [GhcHint] -- TODO: remove the SDoc argument. -- | Couldn't find a top-level binding. -- -- Happens when specifying an annotation for something that -- is not in scope. -- -- Test cases: annfail01, annfail02, annfail11. | NoTopLevelBinding -- | A class doesn't have a method with this name, -- or, a class doesn't have an associated type with this name, -- or, a record doesn't have a record field with this name. | UnknownSubordinate SDoc -- | A name is not in scope during type checking but passed the renamer. -- -- Test cases: -- none | NotInScopeTc (NameEnv TcTyThing) deriving (forall x. NotInScopeError -> Rep NotInScopeError x) -> (forall x. Rep NotInScopeError x -> NotInScopeError) -> Generic NotInScopeError forall x. Rep NotInScopeError x -> NotInScopeError forall x. NotInScopeError -> Rep NotInScopeError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. NotInScopeError -> Rep NotInScopeError x from :: forall x. NotInScopeError -> Rep NotInScopeError x $cto :: forall x. Rep NotInScopeError x -> NotInScopeError to :: forall x. Rep NotInScopeError x -> NotInScopeError Generic -- | Create a @"not in scope"@ error message for the given 'RdrName'. mkTcRnNotInScope :: RdrName -> NotInScopeError -> TcRnMessage mkTcRnNotInScope :: RdrName -> NotInScopeError -> TcRnMessage mkTcRnNotInScope RdrName rdr NotInScopeError err = NotInScopeError -> RdrName -> [ImportError] -> [GhcHint] -> TcRnMessage TcRnNotInScope NotInScopeError err RdrName rdr [] [GhcHint] noHints -- | Configuration for pretty-printing valid hole fits. data HoleFitDispConfig = HFDC { HoleFitDispConfig -> Bool showWrap, HoleFitDispConfig -> Bool showWrapVars, HoleFitDispConfig -> Bool showType, HoleFitDispConfig -> Bool showProv, HoleFitDispConfig -> Bool showMatches :: Bool } -- | Report an error involving a 'Hole'. -- -- This could be an out of scope data constructor or variable, -- a typed hole, or a wildcard in a type. data HoleError -- | Report an out-of-scope data constructor or variable -- masquerading as an expression hole. -- -- See Note [Insoluble holes] in GHC.Tc.Types.Constraint. -- See 'NotInScopeError' for other not-in-scope errors. -- -- Test cases: T9177a. = OutOfScopeHole [ImportError] [GhcHint] -- | Report a typed hole, or wildcard, with additional information. | HoleError HoleSort [TcTyVar] -- Other type variables which get computed on the way. [(SkolemInfoAnon, [TcTyVar])] -- Zonked and grouped skolems for the type of the hole. -- | A message that aims to explain why two types couldn't be seen -- to be representationally equal. data CoercibleMsg -- | Not knowing the role of a type constructor prevents us from -- concluding that two types are representationally equal. -- -- Example: -- -- foo :: Applicative m => m (Sum Int) -- foo = coerce (pure $ 1 :: Int) -- -- We don't know what role `m` has, so we can't coerce `m Int` to `m (Sum Int)`. -- -- Test cases: T8984, TcCoercibleFail. = UnknownRoles Type -- | The fact that a 'TyCon' is abstract prevents us from decomposing -- a 'TyConApp' and deducing that two types are representationally equal. -- -- Test cases: none. | TyConIsAbstract TyCon -- | We can't unwrap a newtype whose constructor is not in scope. -- -- Example: -- -- import Data.Ord (Down) -- NB: not importing the constructor -- foo :: Int -> Down Int -- foo = coerce -- -- Test cases: TcCoercibleFail. | OutOfScopeNewtypeConstructor TyCon DataCon -- | Explain a problem with an import. data ImportError -- | Couldn't find a module with the requested name. = MissingModule ModuleName -- | The imported modules don't export what we're looking for. | ModulesDoNotExport (NE.NonEmpty Module) OccName -- | This datatype collates instances that match or unifier, -- in order to report an error message for an unsolved typeclass constraint. data PotentialInstances = PotentialInstances { PotentialInstances -> [ClsInst] matches :: [ClsInst] , PotentialInstances -> [ClsInst] unifiers :: [ClsInst] } -- | A collection of valid hole fits or refinement fits, -- in which some fits might have been suppressed. data FitsMbSuppressed = Fits { FitsMbSuppressed -> [HoleFit] fits :: [HoleFit] , FitsMbSuppressed -> Bool fitsSuppressed :: Bool -- ^ Whether we have suppressed any fits because there were too many. } -- | A collection of hole fits and refinement fits. data ValidHoleFits = ValidHoleFits { ValidHoleFits -> FitsMbSuppressed holeFits :: FitsMbSuppressed , ValidHoleFits -> FitsMbSuppressed refinementFits :: FitsMbSuppressed } noValidHoleFits :: ValidHoleFits noValidHoleFits :: ValidHoleFits noValidHoleFits = FitsMbSuppressed -> FitsMbSuppressed -> ValidHoleFits ValidHoleFits ([HoleFit] -> Bool -> FitsMbSuppressed Fits [] Bool False) ([HoleFit] -> Bool -> FitsMbSuppressed Fits [] Bool False) data RelevantBindings = RelevantBindings { RelevantBindings -> [(Name, Type)] relevantBindingNamesAndTys :: [(Name, Type)] , RelevantBindings -> Bool ranOutOfFuel :: Bool -- ^ Whether we ran out of fuel generating the bindings. } -- | Display some relevant bindings. pprRelevantBindings :: RelevantBindings -> SDoc -- This function should be in "GHC.Tc.Errors.Ppr", -- but it's here for the moment as it's needed in "GHC.Tc.Errors". pprRelevantBindings :: RelevantBindings -> SDoc pprRelevantBindings (RelevantBindings [(Name, Type)] bds Bool ran_out_of_fuel) = Bool -> SDoc -> SDoc forall doc. IsOutput doc => Bool -> doc -> doc ppUnless ([(Name, Type)] -> Bool forall a. [a] -> Bool forall (t :: * -> *) a. Foldable t => t a -> Bool null [(Name, Type)] rel_bds) (SDoc -> SDoc) -> SDoc -> SDoc forall a b. (a -> b) -> a -> b $ SDoc -> Int -> SDoc -> SDoc hang (String -> SDoc forall doc. IsLine doc => String -> doc text String "Relevant bindings include") Int 2 ([SDoc] -> SDoc forall doc. IsDoc doc => [doc] -> doc vcat (((Name, Type) -> SDoc) -> [(Name, Type)] -> [SDoc] forall a b. (a -> b) -> [a] -> [b] map (Name, Type) -> SDoc forall {a} {a}. (OutputableBndr a, NamedThing a, Outputable a) => (a, a) -> SDoc ppr_binding [(Name, Type)] rel_bds) SDoc -> SDoc -> SDoc forall doc. IsDoc doc => doc -> doc -> doc $$ Bool -> SDoc -> SDoc forall doc. IsOutput doc => Bool -> doc -> doc ppWhen Bool ran_out_of_fuel SDoc discardMsg) where ppr_binding :: (a, a) -> SDoc ppr_binding (a nm, a tidy_ty) = [SDoc] -> SDoc forall doc. IsLine doc => [doc] -> doc sep [ a -> SDoc forall a. OutputableBndr a => a -> SDoc pprPrefixOcc a nm SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> SDoc dcolon SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> a -> SDoc forall a. Outputable a => a -> SDoc ppr a tidy_ty , Int -> SDoc -> SDoc nest Int 2 (SDoc -> SDoc forall doc. IsLine doc => doc -> doc parens (String -> SDoc forall doc. IsLine doc => String -> doc text String "bound at" SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> SrcLoc -> SDoc forall a. Outputable a => a -> SDoc ppr (a -> SrcLoc forall a. NamedThing a => a -> SrcLoc getSrcLoc a nm)))] rel_bds :: [(Name, Type)] rel_bds = ((Name, Type) -> Bool) -> [(Name, Type)] -> [(Name, Type)] forall a. (a -> Bool) -> [a] -> [a] filter (Bool -> Bool not (Bool -> Bool) -> ((Name, Type) -> Bool) -> (Name, Type) -> Bool forall b c a. (b -> c) -> (a -> b) -> a -> c . SrcSpan -> Bool isGeneratedSrcSpan (SrcSpan -> Bool) -> ((Name, Type) -> SrcSpan) -> (Name, Type) -> Bool forall b c a. (b -> c) -> (a -> b) -> a -> c . Name -> SrcSpan forall a. NamedThing a => a -> SrcSpan getSrcSpan (Name -> SrcSpan) -> ((Name, Type) -> Name) -> (Name, Type) -> SrcSpan forall b c a. (b -> c) -> (a -> b) -> a -> c . (Name, Type) -> Name forall a b. (a, b) -> a fst) [(Name, Type)] bds discardMsg :: SDoc discardMsg :: SDoc discardMsg = String -> SDoc forall doc. IsLine doc => String -> doc text String "(Some bindings suppressed;" SDoc -> SDoc -> SDoc forall doc. IsLine doc => doc -> doc -> doc <+> String -> SDoc forall doc. IsLine doc => String -> doc text String "use -fmax-relevant-binds=N or -fno-max-relevant-binds)" -- | Stores the information to be reported in a representation-polymorphism -- error message. data FixedRuntimeRepErrorInfo = FRR_Info { FixedRuntimeRepErrorInfo -> FixedRuntimeRepOrigin frr_info_origin :: FixedRuntimeRepOrigin -- ^ What is the original type we checked for -- representation-polymorphism, and what specific -- check did we perform? , FixedRuntimeRepErrorInfo -> Maybe (TcTyVar, Type) frr_info_not_concrete :: Maybe (TcTyVar, TcType) -- ^ Which non-concrete type did we try to -- unify this concrete type variable with? } {- ************************************************************************ * * \subsection{Contexts for renaming errors} * * ************************************************************************ -} -- AZ:TODO: Change these all to be Name instead of RdrName. -- Merge TcType.UserTypeContext in to it. data HsDocContext = TypeSigCtx SDoc | StandaloneKindSigCtx SDoc | PatCtx | SpecInstSigCtx | DefaultDeclCtx | ForeignDeclCtx (LocatedN RdrName) | DerivDeclCtx | RuleCtx FastString | TyDataCtx (LocatedN RdrName) | TySynCtx (LocatedN RdrName) | TyFamilyCtx (LocatedN RdrName) | FamPatCtx (LocatedN RdrName) -- The patterns of a type/data family instance | ConDeclCtx [LocatedN Name] | ClassDeclCtx (LocatedN RdrName) | ExprWithTySigCtx | TypBrCtx | HsTypeCtx | HsTypePatCtx | GHCiCtx | SpliceTypeCtx (LHsType GhcPs) | ClassInstanceCtx | GenericCtx SDoc -- | Context for a mismatch in the number of arguments data MatchArgsContext = EquationArgs !Name -- ^ Name of the function | PatternArgs !HsMatchContextRn -- ^ Pattern match specifics -- | The information necessary to report mismatched -- numbers of arguments in a match group. data MatchArgBadMatches where MatchArgMatches :: { () matchArgFirstMatch :: LocatedA (Match GhcRn body) , () matchArgBadMatches :: NE.NonEmpty (LocatedA (Match GhcRn body)) } -> MatchArgBadMatches data PragmaWarningInfo = PragmaWarningName { PragmaWarningInfo -> OccName pwarn_occname :: OccName , PragmaWarningInfo -> ModuleName pwarn_impmod :: ModuleName , PragmaWarningInfo -> ModuleName pwarn_declmod :: ModuleName } | PragmaWarningExport { pwarn_occname :: OccName , pwarn_impmod :: ModuleName } | PragmaWarningInstance { PragmaWarningInfo -> TcTyVar pwarn_dfunid :: DFunId , PragmaWarningInfo -> CtOrigin pwarn_ctorig :: CtOrigin } | PragmaWarningDefault { PragmaWarningInfo -> TyCon pwarn_class :: TyCon , pwarn_impmod :: ModuleName } -- | The context for an "empty statement group" error. data EmptyStatementGroupErrReason = EmptyStmtsGroupInParallelComp -- ^ Empty statement group in a parallel list comprehension | EmptyStmtsGroupInTransformListComp -- ^ Empty statement group in a transform list comprehension -- -- Example: -- [() | then ()] | EmptyStmtsGroupInDoNotation HsDoFlavour -- ^ Empty statement group in do notation -- -- Example: -- do | EmptyStmtsGroupInArrowNotation -- ^ Empty statement group in arrow notation -- -- Example: -- proc () -> do deriving ((forall x. EmptyStatementGroupErrReason -> Rep EmptyStatementGroupErrReason x) -> (forall x. Rep EmptyStatementGroupErrReason x -> EmptyStatementGroupErrReason) -> Generic EmptyStatementGroupErrReason forall x. Rep EmptyStatementGroupErrReason x -> EmptyStatementGroupErrReason forall x. EmptyStatementGroupErrReason -> Rep EmptyStatementGroupErrReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. EmptyStatementGroupErrReason -> Rep EmptyStatementGroupErrReason x from :: forall x. EmptyStatementGroupErrReason -> Rep EmptyStatementGroupErrReason x $cto :: forall x. Rep EmptyStatementGroupErrReason x -> EmptyStatementGroupErrReason to :: forall x. Rep EmptyStatementGroupErrReason x -> EmptyStatementGroupErrReason Generic) -- | An existential wrapper around @'StmtLR' GhcPs GhcPs body@. data UnexpectedStatement where UnexpectedStatement :: Outputable (StmtLR GhcPs GhcPs body) => StmtLR GhcPs GhcPs body -> UnexpectedStatement data DeclSort = ClassDeclSort | InstanceDeclSort data NonStandardGuards where NonStandardGuards :: (Outputable body, Anno (Stmt GhcRn body) ~ SrcSpanAnnA) => [LStmtLR GhcRn GhcRn body] -> NonStandardGuards data RuleLhsErrReason = UnboundVariable RdrName NotInScopeError | IllegalExpression data HsigShapeMismatchReason = {-| HsigShapeSortMismatch is an error indicating that an item in the export list of a signature doesn't match the item of the same name in another signature when merging the two – one is a type while the other is a plain identifier. Test cases: none -} HsigShapeSortMismatch !AvailInfo !AvailInfo | {-| HsigShapeNotUnifiable is an error indicating that a name in the export list of a signature cannot be unified with a name of the same name in another signature when merging the two. Test cases: bkpfail20, bkpfail21 -} HsigShapeNotUnifiable !Name !Name !Bool deriving ((forall x. HsigShapeMismatchReason -> Rep HsigShapeMismatchReason x) -> (forall x. Rep HsigShapeMismatchReason x -> HsigShapeMismatchReason) -> Generic HsigShapeMismatchReason forall x. Rep HsigShapeMismatchReason x -> HsigShapeMismatchReason forall x. HsigShapeMismatchReason -> Rep HsigShapeMismatchReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. HsigShapeMismatchReason -> Rep HsigShapeMismatchReason x from :: forall x. HsigShapeMismatchReason -> Rep HsigShapeMismatchReason x $cto :: forall x. Rep HsigShapeMismatchReason x -> HsigShapeMismatchReason to :: forall x. Rep HsigShapeMismatchReason x -> HsigShapeMismatchReason Generic) data WrongThingSort = WrongThingType | WrongThingDataCon | WrongThingPatSyn | WrongThingConLike | WrongThingClass | WrongThingTyCon | WrongThingAxiom data StageCheckReason = StageCheckInstance !InstanceWhat !PredType | StageCheckSplice !Name data UninferrableTyVarCtx = UninfTyCtx_ClassContext [TcType] | UninfTyCtx_DataContext [TcType] | UninfTyCtx_ProvidedContext [TcType] | UninfTyCtx_TyFamRhs TcType | UninfTyCtx_TySynRhs TcType | UninfTyCtx_Sig TcType (LHsSigType GhcRn) data PatSynInvalidRhsReason = PatSynNotInvertible !(Pat GhcRn) | PatSynUnboundVar !Name deriving ((forall x. PatSynInvalidRhsReason -> Rep PatSynInvalidRhsReason x) -> (forall x. Rep PatSynInvalidRhsReason x -> PatSynInvalidRhsReason) -> Generic PatSynInvalidRhsReason forall x. Rep PatSynInvalidRhsReason x -> PatSynInvalidRhsReason forall x. PatSynInvalidRhsReason -> Rep PatSynInvalidRhsReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. PatSynInvalidRhsReason -> Rep PatSynInvalidRhsReason x from :: forall x. PatSynInvalidRhsReason -> Rep PatSynInvalidRhsReason x $cto :: forall x. Rep PatSynInvalidRhsReason x -> PatSynInvalidRhsReason to :: forall x. Rep PatSynInvalidRhsReason x -> PatSynInvalidRhsReason Generic) data BadFieldAnnotationReason where {-| A lazy data type field annotation (~) was used without enabling the extension StrictData. Test cases: LazyFieldsDisabled -} LazyFieldsDisabled :: BadFieldAnnotationReason {-| An UNPACK pragma was applied to a field without strictness annotation (!). Test cases: T14761a, T7562 -} UnpackWithoutStrictness :: BadFieldAnnotationReason {-| An UNPACK pragma was applied to an abstract type in an indefinite package in Backpack. Test cases: unpack_sums_5, T3966, T7050 -} BackpackUnpackAbstractType :: BadFieldAnnotationReason deriving ((forall x. BadFieldAnnotationReason -> Rep BadFieldAnnotationReason x) -> (forall x. Rep BadFieldAnnotationReason x -> BadFieldAnnotationReason) -> Generic BadFieldAnnotationReason forall x. Rep BadFieldAnnotationReason x -> BadFieldAnnotationReason forall x. BadFieldAnnotationReason -> Rep BadFieldAnnotationReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. BadFieldAnnotationReason -> Rep BadFieldAnnotationReason x from :: forall x. BadFieldAnnotationReason -> Rep BadFieldAnnotationReason x $cto :: forall x. Rep BadFieldAnnotationReason x -> BadFieldAnnotationReason to :: forall x. Rep BadFieldAnnotationReason x -> BadFieldAnnotationReason Generic) data SuperclassCycle = MkSuperclassCycle { SuperclassCycle -> Class cls :: Class, SuperclassCycle -> Bool definite :: Bool, SuperclassCycle -> [SuperclassCycleDetail] reasons :: [SuperclassCycleDetail] } data SuperclassCycleDetail = SCD_HeadTyVar !PredType | SCD_HeadTyFam !PredType | SCD_Superclass !Class data RoleValidationFailedReason = TyVarRoleMismatch !TyVar !Role | TyVarMissingInEnv !TyVar | BadCoercionRole !Coercion deriving ((forall x. RoleValidationFailedReason -> Rep RoleValidationFailedReason x) -> (forall x. Rep RoleValidationFailedReason x -> RoleValidationFailedReason) -> Generic RoleValidationFailedReason forall x. Rep RoleValidationFailedReason x -> RoleValidationFailedReason forall x. RoleValidationFailedReason -> Rep RoleValidationFailedReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. RoleValidationFailedReason -> Rep RoleValidationFailedReason x from :: forall x. RoleValidationFailedReason -> Rep RoleValidationFailedReason x $cto :: forall x. Rep RoleValidationFailedReason x -> RoleValidationFailedReason to :: forall x. Rep RoleValidationFailedReason x -> RoleValidationFailedReason Generic) data DisabledClassExtension where {-| MultiParamTypeClasses is required. Test cases: readFail037, TcNoNullaryTC -} MultiParamDisabled :: !Int -- ^ The arity -> DisabledClassExtension {-| FunctionalDependencies is required. Test cases: readFail041 -} FunDepsDisabled :: DisabledClassExtension {-| ConstrainedClassMethods is required. Test cases: mod39, tcfail150 -} ConstrainedClassMethodsDisabled :: !Id -> !TcPredType -> DisabledClassExtension deriving ((forall x. DisabledClassExtension -> Rep DisabledClassExtension x) -> (forall x. Rep DisabledClassExtension x -> DisabledClassExtension) -> Generic DisabledClassExtension forall x. Rep DisabledClassExtension x -> DisabledClassExtension forall x. DisabledClassExtension -> Rep DisabledClassExtension x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. DisabledClassExtension -> Rep DisabledClassExtension x from :: forall x. DisabledClassExtension -> Rep DisabledClassExtension x $cto :: forall x. Rep DisabledClassExtension x -> DisabledClassExtension to :: forall x. Rep DisabledClassExtension x -> DisabledClassExtension Generic) data TyFamsDisabledReason = TyFamsDisabledFamily !Name | TyFamsDisabledInstance !TyCon deriving ((forall x. TyFamsDisabledReason -> Rep TyFamsDisabledReason x) -> (forall x. Rep TyFamsDisabledReason x -> TyFamsDisabledReason) -> Generic TyFamsDisabledReason forall x. Rep TyFamsDisabledReason x -> TyFamsDisabledReason forall x. TyFamsDisabledReason -> Rep TyFamsDisabledReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TyFamsDisabledReason -> Rep TyFamsDisabledReason x from :: forall x. TyFamsDisabledReason -> Rep TyFamsDisabledReason x $cto :: forall x. Rep TyFamsDisabledReason x -> TyFamsDisabledReason to :: forall x. Rep TyFamsDisabledReason x -> TyFamsDisabledReason Generic) data TypeApplication = TypeApplication !(HsType GhcPs) !TypeOrKind | TypeApplicationInPattern !(HsConPatTyArg GhcPs) deriving (forall x. TypeApplication -> Rep TypeApplication x) -> (forall x. Rep TypeApplication x -> TypeApplication) -> Generic TypeApplication forall x. Rep TypeApplication x -> TypeApplication forall x. TypeApplication -> Rep TypeApplication x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TypeApplication -> Rep TypeApplication x from :: forall x. TypeApplication -> Rep TypeApplication x $cto :: forall x. Rep TypeApplication x -> TypeApplication to :: forall x. Rep TypeApplication x -> TypeApplication Generic -- | Either `HsType p` or `HsSigType p`. -- -- Used for reporting errors in `TcRnIllegalKind`. data HsTypeOrSigType p = HsType (HsType p) | HsSigType (HsSigType p) instance OutputableBndrId p => Outputable (HsTypeOrSigType (GhcPass p)) where ppr :: HsTypeOrSigType (GhcPass p) -> SDoc ppr (HsType HsType (GhcPass p) ty) = HsType (GhcPass p) -> SDoc forall a. Outputable a => a -> SDoc ppr HsType (GhcPass p) ty ppr (HsSigType HsSigType (GhcPass p) sig_ty) = HsSigType (GhcPass p) -> SDoc forall a. Outputable a => a -> SDoc ppr HsSigType (GhcPass p) sig_ty -- | A wrapper around HsTyVarBndr. -- Used for reporting errors in `TcRnUnusedQuantifiedTypeVar`. data HsTyVarBndrExistentialFlag = forall flag. OutputableBndrFlag flag 'Renamed => HsTyVarBndrExistentialFlag (HsTyVarBndr flag GhcRn) instance Outputable HsTyVarBndrExistentialFlag where ppr :: HsTyVarBndrExistentialFlag -> SDoc ppr (HsTyVarBndrExistentialFlag HsTyVarBndr flag GhcRn hsTyVarBndr) = HsTyVarBndr flag GhcRn -> SDoc forall a. Outputable a => a -> SDoc ppr HsTyVarBndr flag GhcRn hsTyVarBndr type TySynCycleTyCons = [Either TyCon (LTyClDecl GhcRn)] -- | Different types of warnings for dodgy imports. data DodgyImportsReason = {-| An import of the form 'T(..)' or 'f(..)' does not actually import anything beside 'T'/'f' itself. Test cases: DodgyImports -} DodgyImportsEmptyParent !GlobalRdrElt | {-| A 'hiding' clause contains something that would be reported as an error in a regular import, but is relaxed to a warning. Test cases: DodgyImports_hiding -} DodgyImportsHiding !ImportLookupReason deriving ((forall x. DodgyImportsReason -> Rep DodgyImportsReason x) -> (forall x. Rep DodgyImportsReason x -> DodgyImportsReason) -> Generic DodgyImportsReason forall x. Rep DodgyImportsReason x -> DodgyImportsReason forall x. DodgyImportsReason -> Rep DodgyImportsReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. DodgyImportsReason -> Rep DodgyImportsReason x from :: forall x. DodgyImportsReason -> Rep DodgyImportsReason x $cto :: forall x. Rep DodgyImportsReason x -> DodgyImportsReason to :: forall x. Rep DodgyImportsReason x -> DodgyImportsReason Generic) -- | Different types of errors for import lookup. data ImportLookupReason where {-| An item in an import statement is not exported by the corresponding module. Test cases: T21826, recomp001, retc001, mod79, mod80, mod81, mod91, T6007, T7167, T9006, T11071, T9905fail2, T5385, T10668 -} ImportLookupBad :: BadImportKind -> ModIface -> ImpDeclSpec -> IE GhcPs -> Bool -- ^ whether @-XPatternSynonyms@ was enabled -> ImportLookupReason {-| A name is specified with a qualifying module. Test cases: T3792 -} ImportLookupQualified :: !RdrName -- ^ The name extracted from the import item -> ImportLookupReason {-| Something completely unexpected is in an import list, like @module Foo@. Test cases: ImportLookupIllegal -} ImportLookupIllegal :: ImportLookupReason {-| An item in an import list matches multiple names exported from that module. Test cases: None -} ImportLookupAmbiguous :: !RdrName -- ^ The name extracted from the import item -> ![GlobalRdrElt] -- ^ The potential matches -> ImportLookupReason deriving ((forall x. ImportLookupReason -> Rep ImportLookupReason x) -> (forall x. Rep ImportLookupReason x -> ImportLookupReason) -> Generic ImportLookupReason forall x. Rep ImportLookupReason x -> ImportLookupReason forall x. ImportLookupReason -> Rep ImportLookupReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. ImportLookupReason -> Rep ImportLookupReason x from :: forall x. ImportLookupReason -> Rep ImportLookupReason x $cto :: forall x. Rep ImportLookupReason x -> ImportLookupReason to :: forall x. Rep ImportLookupReason x -> ImportLookupReason Generic) -- | Distinguish record fields from other names for pretty-printing. data UnusedImportName where UnusedImportNameRecField :: !Parent -> !OccName -> UnusedImportName UnusedImportNameRegular :: !Name -> UnusedImportName -- | Different types of errors for unused imports. data UnusedImportReason where {-| No names in the import list are used in the module. Test cases: overloadedrecfldsfail06, T10890_2, t22391, t22391j, T1074, prog018, mod177, rn046, rn037, T5211 -} UnusedImportNone :: UnusedImportReason {-| A set of names in the import list are not used in the module. Test cases: overloadedrecfldsfail06, T17324, mod176, T11970A, rn046, T14881, T7454, T8149, T13064 -} UnusedImportSome :: ![UnusedImportName] -- ^ The unsed names -> UnusedImportReason deriving ((forall x. UnusedImportReason -> Rep UnusedImportReason x) -> (forall x. Rep UnusedImportReason x -> UnusedImportReason) -> Generic UnusedImportReason forall x. Rep UnusedImportReason x -> UnusedImportReason forall x. UnusedImportReason -> Rep UnusedImportReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. UnusedImportReason -> Rep UnusedImportReason x from :: forall x. UnusedImportReason -> Rep UnusedImportReason x $cto :: forall x. Rep UnusedImportReason x -> UnusedImportReason to :: forall x. Rep UnusedImportReason x -> UnusedImportReason Generic) -- | Different places in which a nested foralls/contexts error might occur. data NestedForallsContextsIn -- | Nested forall in @SPECIALISE instance@ = NFC_Specialize -- | Nested forall in @deriving via@ (via-type) | NFC_ViaType -- | Nested forall in the type of a GADT constructor | NFC_GadtConSig -- | Nested forall in an instance head | NFC_InstanceHead -- | Nested forall in a standalone deriving instance head | NFC_StandaloneDerivedInstanceHead -- | Nested forall in deriving class type | NFC_DerivedClassType -- | Provenance of an unused name. data UnusedNameProv = UnusedNameTopDecl | UnusedNameImported !ModuleName | UnusedNameTypePattern | UnusedNameMatch | UnusedNameLocalBind -- | Different reasons for TcRnNonCanonicalDefinition. data NonCanonicalDefinition = -- | Related to @(<>)@ and @mappend@. NonCanonicalMonoid NonCanonical_Monoid | -- | Related to @(*>)@/@(>>)@ and @pure@/@return@. NonCanonicalMonad NonCanonical_Monad deriving ((forall x. NonCanonicalDefinition -> Rep NonCanonicalDefinition x) -> (forall x. Rep NonCanonicalDefinition x -> NonCanonicalDefinition) -> Generic NonCanonicalDefinition forall x. Rep NonCanonicalDefinition x -> NonCanonicalDefinition forall x. NonCanonicalDefinition -> Rep NonCanonicalDefinition x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. NonCanonicalDefinition -> Rep NonCanonicalDefinition x from :: forall x. NonCanonicalDefinition -> Rep NonCanonicalDefinition x $cto :: forall x. Rep NonCanonicalDefinition x -> NonCanonicalDefinition to :: forall x. Rep NonCanonicalDefinition x -> NonCanonicalDefinition Generic) -- | Possible cases for the -Wnoncanonical-monoid-instances. data NonCanonical_Monoid = -- | @(<>) = mappend@ was defined. NonCanonical_Sappend | -- | @mappend@ was defined as something other than @(<>)@. NonCanonical_Mappend -- | Possible cases for the -Wnoncanonical-monad-instances. data NonCanonical_Monad = -- | @pure = return@ was defined. NonCanonical_Pure | -- | @(*>) = (>>)@ was defined. NonCanonical_ThenA | -- | @return@ was defined as something other than @pure@. NonCanonical_Return | -- | @(>>)@ was defined as something other than @(*>)@. NonCanonical_ThenM -- | Why was an instance declaration rejected? data IllegalInstanceReason = IllegalClassInstance !TypedThing -- ^ the instance head type !IllegalClassInstanceReason -- ^ the problem with the instance head | IllegalFamilyInstance !IllegalFamilyInstanceReason | IllegalFamilyApplicationInInstance !Type -- ^ the instance head type !Bool -- ^ is this an invisible argument? !TyCon -- ^ type family ![Type] -- ^ type family argument deriving (forall x. IllegalInstanceReason -> Rep IllegalInstanceReason x) -> (forall x. Rep IllegalInstanceReason x -> IllegalInstanceReason) -> Generic IllegalInstanceReason forall x. Rep IllegalInstanceReason x -> IllegalInstanceReason forall x. IllegalInstanceReason -> Rep IllegalInstanceReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalInstanceReason -> Rep IllegalInstanceReason x from :: forall x. IllegalInstanceReason -> Rep IllegalInstanceReason x $cto :: forall x. Rep IllegalInstanceReason x -> IllegalInstanceReason to :: forall x. Rep IllegalInstanceReason x -> IllegalInstanceReason Generic -- | Why was a class instance declaration rejected? data IllegalClassInstanceReason -- | An illegal type at the head of the instance. -- -- See t'IllegalInstanceHeadReason'. = IllegalInstanceHead !IllegalInstanceHeadReason -- | An illegal HasField instance. See t'IllegalHasFieldInstance'. | IllegalHasFieldInstance !IllegalHasFieldInstance -- | An illegal instance for a built-in typeclass such as -- 'Coercible', 'Typeable', or 'KnownNat', outside of a signature file. -- -- Test cases: deriving/should_fail/T9687 -- deriving/should_fail/T14916 -- polykinds/T8132 -- typecheck/should_fail/TcCoercibleFail2 -- typecheck/should_fail/T12837 -- typecheck/should_fail/T14390 | IllegalSpecialClassInstance !Class !Bool -- ^ Whether the error is due to Safe Haskell being enabled -- | The instance failed the coverage condition, i.e. the functional -- dependencies were not respected. -- -- Example: -- -- class C a b | a -> b where {..} -- instance C a b where {..} -- -- Test cases: T9106, T10570, T2247, T12803, tcfail170. | IllegalInstanceFailsCoverageCondition !Class !CoverageProblem deriving (forall x. IllegalClassInstanceReason -> Rep IllegalClassInstanceReason x) -> (forall x. Rep IllegalClassInstanceReason x -> IllegalClassInstanceReason) -> Generic IllegalClassInstanceReason forall x. Rep IllegalClassInstanceReason x -> IllegalClassInstanceReason forall x. IllegalClassInstanceReason -> Rep IllegalClassInstanceReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalClassInstanceReason -> Rep IllegalClassInstanceReason x from :: forall x. IllegalClassInstanceReason -> Rep IllegalClassInstanceReason x $cto :: forall x. Rep IllegalClassInstanceReason x -> IllegalClassInstanceReason to :: forall x. Rep IllegalClassInstanceReason x -> IllegalClassInstanceReason Generic -- | Why was a HasField instance declaration rejected? data IllegalHasFieldInstance -- | HasField instance for a type not headed by a TyCon. -- -- Example: -- -- instance HasField a where {..} -- -- Test case: hasfieldfail03 = IllegalHasFieldInstanceNotATyCon -- | HasField instance for a data family. -- -- Example: -- -- data family D a -- data instance D Int = MkDInt Char -- -- instance HasField "fld" (D Int) where {..} -- -- Test case: hasfieldfail03 | IllegalHasFieldInstanceFamilyTyCon -- | HasField instance for a type that already has that field. -- -- Example -- -- data T = MkT { quux :: Int } -- instance HasField "quux" T Int where {..} -- -- Test case: hasfieldfail03 | IllegalHasFieldInstanceTyConHasField !TyCon !FieldLabelString -- | HasField instance for a type that already has fields, when the -- field label could potentially unify with those fields. -- -- Example: -- -- data T = MkInt { quux :: Int } -- instance forall (fld :: Symbol). HasField fld T Int where {..} -- -- Test case: hasfieldfail03 | IllegalHasFieldInstanceTyConHasFields !TyCon !Type -- ^ the label type in the instance head deriving (forall x. IllegalHasFieldInstance -> Rep IllegalHasFieldInstance x) -> (forall x. Rep IllegalHasFieldInstance x -> IllegalHasFieldInstance) -> Generic IllegalHasFieldInstance forall x. Rep IllegalHasFieldInstance x -> IllegalHasFieldInstance forall x. IllegalHasFieldInstance -> Rep IllegalHasFieldInstance x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalHasFieldInstance -> Rep IllegalHasFieldInstance x from :: forall x. IllegalHasFieldInstance -> Rep IllegalHasFieldInstance x $cto :: forall x. Rep IllegalHasFieldInstance x -> IllegalHasFieldInstance to :: forall x. Rep IllegalHasFieldInstance x -> IllegalHasFieldInstance Generic -- | Description of an instance coverage condition failure. data CoverageProblem = CoverageProblem { CoverageProblem -> ([TcTyVar], [TcTyVar]) not_covered_fundep :: ([TyVar], [TyVar]) , CoverageProblem -> ([Type], [Type]) not_covered_fundep_inst :: ([Type], [Type]) , CoverageProblem -> Pair VarSet not_covered_invis_vis_tvs :: Pair VarSet , CoverageProblem -> FailedCoverageCondition not_covered_liberal :: FailedCoverageCondition } -- | Which instance coverage condition failed? Was it the liberal -- coverage condition? data FailedCoverageCondition -- | Failed the instance coverage condition (ICC) = FailedICC { FailedCoverageCondition -> Bool alsoFailedLICC :: !Bool -- ^ Whether the instance also failed the LICC } -- | Failed the liberal instance coverage condition (LICC) | FailedLICC -------------------------------------------------------------------------------- -- Template Haskell errors data THError -- | A syntax error with Template Haskel quotes & splices. -- See t'THSyntaxError'. = THSyntaxError !THSyntaxError -- | An error in Template Haskell involving 'Name's. -- See t'THNameError'. | THNameError !THNameError -- | An error in Template Haskell reification. See t'THReifyError'. | THReifyError !THReifyError -- | An error due to typing restrictions in Typed Template Haskell. -- See t'TypedTHError'. | TypedTHError !TypedTHError -- | An error occurred when trying to run a splice in Template Haskell. -- See 'SpliceFailReason'. | THSpliceFailed !SpliceFailReason -- | An error involving the 'addTopDecls' functionality. See t'AddTopDeclsError'. | AddTopDeclsError !AddTopDeclsError {-| IllegalStaticFormInSplice is an error when a user attempts to define a static pointer in a Template Haskell splice. Example(s): Test cases: th/TH_StaticPointers02 -} | IllegalStaticFormInSplice !(HsExpr GhcPs) {-| FailedToLookupThInstName is a Template Haskell error that occurrs when looking up an instance fails. Example(s): Test cases: showIface/should_fail/THPutDocNonExistent -} | FailedToLookupThInstName !TH.Type !LookupTHInstNameErrReason {-| AddInvalidCorePlugin is a Template Haskell error indicating that a Core plugin being added has an invalid module due to being in the current package. Example(s): Test cases: -} | AddInvalidCorePlugin !String -- ^ Module name {-| AddDocToNonLocalDefn is a Template Haskell error for documentation being added to a definition which is not in the current module. Example(s): Test cases: showIface/should_fail/THPutDocExternal -} | AddDocToNonLocalDefn !TH.DocLoc {-| ReportCustomQuasiError is an error or warning thrown using 'qReport' from the 'Quasi' instance of 'TcM'. Example(s): Test cases: -} | ReportCustomQuasiError !Bool -- ^ True => Error, False => Warning !String -- ^ Error body deriving (forall x. THError -> Rep THError x) -> (forall x. Rep THError x -> THError) -> Generic THError forall x. Rep THError x -> THError forall x. THError -> Rep THError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. THError -> Rep THError x from :: forall x. THError -> Rep THError x $cto :: forall x. Rep THError x -> THError to :: forall x. Rep THError x -> THError Generic -- | An error involving Template Haskell quotes or splices, e.g. nested -- quotation brackets or the use of an untyped bracket inside a typed splice. data THSyntaxError = {-| IllegalTHQuotes is an error that occurs when a Template Haskell quote is used without the TemplateHaskell extension enabled. Test case: T18251e -} IllegalTHQuotes !(HsExpr GhcPs) {-| IllegalTHSplice is an error that occurs when a Template Haskell splice occurs without having enabled the TemplateHaskell extension. Test cases: bkpfail01, bkpfail05, bkpfail09, bkpfail16, bkpfail35, bkpcabal06 -} | IllegalTHSplice {-| NestedTHBrackets is an error that occurs when Template Haskell brackets are nested without any intervening splices. Example: foo = [| [| 'x' |] |] Test cases: TH_NestedSplicesFail{5,6,7,8} -} | NestedTHBrackets {-| MismatchedSpliceType is an error that happens when a typed bracket or splice is used inside a typed splice/bracket, or the other way around. Examples: f1 = [| $$x |] f2 = [|| $y ||] f3 = $$( [| 'x' |] ) f4 = $( [|| 'y' ||] ) Test cases: TH_NestedSplicesFail{1,2,3,4} -} | MismatchedSpliceType SpliceType -- ^ type of the splice SpliceOrBracket -- ^ what's nested inside {-| BadImplicitSplice is an error thrown when a user uses top-level implicit TH-splice without enabling the TemplateHaskell extension. Example: pure [] -- on top-level Test cases: ghci/prog019/prog019 ghci/scripts/T1914 ghci/scripts/T6106 rename/should_fail/T4042 rename/should_fail/T12146 -} | BadImplicitSplice deriving (forall x. THSyntaxError -> Rep THSyntaxError x) -> (forall x. Rep THSyntaxError x -> THSyntaxError) -> Generic THSyntaxError forall x. Rep THSyntaxError x -> THSyntaxError forall x. THSyntaxError -> Rep THSyntaxError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. THSyntaxError -> Rep THSyntaxError x from :: forall x. THSyntaxError -> Rep THSyntaxError x $cto :: forall x. Rep THSyntaxError x -> THSyntaxError to :: forall x. Rep THSyntaxError x -> THSyntaxError Generic data THNameError {-| NonExactName is a Template Haskell error that occurs when the user attempts to define a binder with a 'RdrName' that is not an exact 'Name'. Example(s): Test cases: -} = NonExactName !RdrName {-| QuotedNameWrongStage is an error that can happen when a (non-top-level) Name is used at a different Template Haskell stage than the stage at which it is bound. Test cases: T16976z -} | QuotedNameWrongStage !(HsQuote GhcPs) deriving (forall x. THNameError -> Rep THNameError x) -> (forall x. Rep THNameError x -> THNameError) -> Generic THNameError forall x. Rep THNameError x -> THNameError forall x. THNameError -> Rep THNameError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. THNameError -> Rep THNameError x from :: forall x. THNameError -> Rep THNameError x $cto :: forall x. Rep THNameError x -> THNameError to :: forall x. Rep THNameError x -> THNameError Generic data THReifyError = {-| CannotReifyInstance is a Template Haskell error for when an instance being reified via `reifyInstances` is not a class constraint or type family application. Example(s): Test cases: -} CannotReifyInstance !Type {-| CannotReifyOutOfScopeThing is a Template Haskell error indicating that the given name is not in scope and therefore cannot be reified. Example(s): Test cases: th/T16976f -} | CannotReifyOutOfScopeThing !TH.Name {-| CannotReifyThingNotInTypeEnv is a Template Haskell error occurring when the given name is not in the type environment and therefore cannot be reified. Example(s): Test cases: -} | CannotReifyThingNotInTypeEnv !Name {-| NoRolesAssociatedWithName is a Template Haskell error for when the user tries to reify the roles of a given name but it is not something that has roles associated with it. Example(s): Test cases: -} | NoRolesAssociatedWithThing !TcTyThing {-| CannotRepresentThing is a Template Haskell error indicating that a type cannot be reified because it does not have a representation in Template Haskell. Example(s): Test cases: -} | CannotRepresentType !UnrepresentableTypeDescr !Type deriving (forall x. THReifyError -> Rep THReifyError x) -> (forall x. Rep THReifyError x -> THReifyError) -> Generic THReifyError forall x. Rep THReifyError x -> THReifyError forall x. THReifyError -> Rep THReifyError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. THReifyError -> Rep THReifyError x from :: forall x. THReifyError -> Rep THReifyError x $cto :: forall x. Rep THReifyError x -> THReifyError to :: forall x. Rep THReifyError x -> THReifyError Generic data AddTopDeclsError = {-| InvalidTopDecl is a Template Haskell error occurring when one of the 'Dec's passed to 'addTopDecls' is not a function, value, annotation, or foreign import declaration. Example(s): Test cases: -} InvalidTopDecl !(HsDecl GhcPs) {-| UnexpectedDeclarationSplice is an error that occurs when a Template Haskell splice appears inside top-level declarations added with 'addTopDecls'. Example(s): none Test cases: none -} | AddTopDeclsUnexpectedDeclarationSplice | AddTopDeclsRunSpliceFailure !RunSpliceFailReason deriving (forall x. AddTopDeclsError -> Rep AddTopDeclsError x) -> (forall x. Rep AddTopDeclsError x -> AddTopDeclsError) -> Generic AddTopDeclsError forall x. Rep AddTopDeclsError x -> AddTopDeclsError forall x. AddTopDeclsError -> Rep AddTopDeclsError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. AddTopDeclsError -> Rep AddTopDeclsError x from :: forall x. AddTopDeclsError -> Rep AddTopDeclsError x $cto :: forall x. Rep AddTopDeclsError x -> AddTopDeclsError to :: forall x. Rep AddTopDeclsError x -> AddTopDeclsError Generic data TypedTHError = {-| SplicePolymorphicLocalVar is the error that occurs when the expression inside typed Template Haskell brackets is a polymorphic local variable. Example(s): x = \(y :: forall a. a -> a) -> [|| y ||] Test cases: quotes/T10384 -} SplicePolymorphicLocalVar !Id {-| TypedTHWithPolyType is an error that signifies the illegal use of a polytype in a typed Template Haskell expression. Example(s): bad :: (forall a. a -> a) -> () bad = $$( [|| \_ -> () ||] ) Test cases: th/T11452 -} | TypedTHWithPolyType !TcType deriving (forall x. TypedTHError -> Rep TypedTHError x) -> (forall x. Rep TypedTHError x -> TypedTHError) -> Generic TypedTHError forall x. Rep TypedTHError x -> TypedTHError forall x. TypedTHError -> Rep TypedTHError x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TypedTHError -> Rep TypedTHError x from :: forall x. TypedTHError -> Rep TypedTHError x $cto :: forall x. Rep TypedTHError x -> TypedTHError to :: forall x. Rep TypedTHError x -> TypedTHError Generic data SpliceFailReason = {-| SpliceThrewException is an error that occurs when running a Template Haskell splice throws an exception. Example(s): Test cases: annotations/should_fail/annfail12 perf/compiler/MultiLayerModulesTH_Make perf/compiler/MultiLayerModulesTH_OneShot th/T10796b th/T19470 th/T19709d th/T5358 th/T5976 th/T7276a th/T8987 th/TH_exn1 th/TH_exn2 th/TH_runIO -} SpliceThrewException !SplicePhase !SomeException !String -- ^ Result of showing the exception (cannot be done safely outside IO) !(LHsExpr GhcTc) !Bool -- True <=> Print the expression {-| RunSpliceFailure is an error indicating that a Template Haskell splice failed to be converted into a valid expression. Example(s): Test cases: th/T10828a th/T10828b th/T12478_4 th/T15270A th/T15270B th/T16895a th/T16895b th/T16895c th/T16895d th/T16895e th/T18740d th/T2597b th/T2674 th/T3395 th/T7484 th/T7667a th/TH_implicitParamsErr1 th/TH_implicitParamsErr2 th/TH_implicitParamsErr3 th/TH_invalid_add_top_decl -} | RunSpliceFailure !RunSpliceFailReason deriving (forall x. SpliceFailReason -> Rep SpliceFailReason x) -> (forall x. Rep SpliceFailReason x -> SpliceFailReason) -> Generic SpliceFailReason forall x. Rep SpliceFailReason x -> SpliceFailReason forall x. SpliceFailReason -> Rep SpliceFailReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. SpliceFailReason -> Rep SpliceFailReason x from :: forall x. SpliceFailReason -> Rep SpliceFailReason x $cto :: forall x. Rep SpliceFailReason x -> SpliceFailReason to :: forall x. Rep SpliceFailReason x -> SpliceFailReason Generic data RunSpliceFailReason = ConversionFail !ThingBeingConverted !ConversionFailReason deriving (forall x. RunSpliceFailReason -> Rep RunSpliceFailReason x) -> (forall x. Rep RunSpliceFailReason x -> RunSpliceFailReason) -> Generic RunSpliceFailReason forall x. Rep RunSpliceFailReason x -> RunSpliceFailReason forall x. RunSpliceFailReason -> Rep RunSpliceFailReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. RunSpliceFailReason -> Rep RunSpliceFailReason x from :: forall x. RunSpliceFailReason -> Rep RunSpliceFailReason x $cto :: forall x. Rep RunSpliceFailReason x -> RunSpliceFailReason to :: forall x. Rep RunSpliceFailReason x -> RunSpliceFailReason Generic -- | Identifies the TH splice attempting to be converted data ThingBeingConverted = ConvDec !TH.Dec | ConvExp !TH.Exp | ConvPat !TH.Pat | ConvType !TH.Type -- | The reason a TH splice could not be converted to a Haskell expression data ConversionFailReason = IllegalOccName !OccName.NameSpace !String | SumAltArityExceeded !TH.SumAlt !TH.SumArity | IllegalSumAlt !TH.SumAlt | IllegalSumArity !TH.SumArity | MalformedType !TypeOrKind !TH.Type | IllegalLastStatement !HsDoFlavour !(LStmt GhcPs (LHsExpr GhcPs)) | KindSigsOnlyAllowedOnGADTs | IllegalDeclaration !THDeclDescriptor !IllegalDecls | CannotMixGADTConsWith98Cons | EmptyStmtListInDoBlock | NonVarInInfixExpr | MultiWayIfWithoutAlts | CasesExprWithoutAlts | ImplicitParamsWithOtherBinds | InvalidCCallImpent !String -- ^ Source | RecGadtNoCons | GadtNoCons | InvalidTypeInstanceHeader !TH.Type | InvalidTyFamInstLHS !TH.Type | InvalidImplicitParamBinding | DefaultDataInstDecl ![LDataFamInstDecl GhcPs] | FunBindLacksEquations !TH.Name deriving (forall x. ConversionFailReason -> Rep ConversionFailReason x) -> (forall x. Rep ConversionFailReason x -> ConversionFailReason) -> Generic ConversionFailReason forall x. Rep ConversionFailReason x -> ConversionFailReason forall x. ConversionFailReason -> Rep ConversionFailReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. ConversionFailReason -> Rep ConversionFailReason x from :: forall x. ConversionFailReason -> Rep ConversionFailReason x $cto :: forall x. Rep ConversionFailReason x -> ConversionFailReason to :: forall x. Rep ConversionFailReason x -> ConversionFailReason Generic data IllegalDecls = IllegalDecls !(NE.NonEmpty (LHsDecl GhcPs)) | IllegalFamDecls !(NE.NonEmpty (LFamilyDecl GhcPs)) -- | Label for a TH declaration data THDeclDescriptor = InstanceDecl | WhereClause | LetBinding | LetExpression | ClssDecl -- | The phase in which an exception was encountered when dealing with a TH splice data SplicePhase = SplicePhase_Run | SplicePhase_CompileAndLink data LookupTHInstNameErrReason = NoMatchesFound | CouldNotDetermineInstance data UnrepresentableTypeDescr = LinearInvisibleArgument | CoercionsInTypes -- FFI error types data IllegalForeignTypeReason = TypeCannotBeMarshaled !Type TypeCannotBeMarshaledReason | ForeignDynNotPtr !Type -- ^ Expected type !Type -- ^ Actual type | SafeHaskellMustBeInIO | IOResultExpected | UnexpectedNestedForall | LinearTypesNotAllowed | OneArgExpected | AtLeastOneArgExpected deriving (forall x. IllegalForeignTypeReason -> Rep IllegalForeignTypeReason x) -> (forall x. Rep IllegalForeignTypeReason x -> IllegalForeignTypeReason) -> Generic IllegalForeignTypeReason forall x. Rep IllegalForeignTypeReason x -> IllegalForeignTypeReason forall x. IllegalForeignTypeReason -> Rep IllegalForeignTypeReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. IllegalForeignTypeReason -> Rep IllegalForeignTypeReason x from :: forall x. IllegalForeignTypeReason -> Rep IllegalForeignTypeReason x $cto :: forall x. Rep IllegalForeignTypeReason x -> IllegalForeignTypeReason to :: forall x. Rep IllegalForeignTypeReason x -> IllegalForeignTypeReason Generic -- | Reason why a type cannot be marshalled through the FFI. data TypeCannotBeMarshaledReason = NotADataType | NewtypeDataConNotInScope !TyCon ![Type] | UnliftedFFITypesNeeded | NotABoxedMarshalableTyCon | ForeignLabelNotAPtr | NotSimpleUnliftedType | NotBoxedKindAny deriving (forall x. TypeCannotBeMarshaledReason -> Rep TypeCannotBeMarshaledReason x) -> (forall x. Rep TypeCannotBeMarshaledReason x -> TypeCannotBeMarshaledReason) -> Generic TypeCannotBeMarshaledReason forall x. Rep TypeCannotBeMarshaledReason x -> TypeCannotBeMarshaledReason forall x. TypeCannotBeMarshaledReason -> Rep TypeCannotBeMarshaledReason x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TypeCannotBeMarshaledReason -> Rep TypeCannotBeMarshaledReason x from :: forall x. TypeCannotBeMarshaledReason -> Rep TypeCannotBeMarshaledReason x $cto :: forall x. Rep TypeCannotBeMarshaledReason x -> TypeCannotBeMarshaledReason to :: forall x. Rep TypeCannotBeMarshaledReason x -> TypeCannotBeMarshaledReason Generic data TcRnNoDerivStratSpecifiedInfo where {-| 'TcRnNoDerivStratSpecified TcRnNoDerivingClauseStrategySpecified' is a warning implied by -Wmissing-deriving-strategies and triggered by a deriving clause without a specified deriving strategy. Example: newtype T = T Int deriving (Eq, Ord, Show) Here we would suggest fixing the deriving clause to: deriving stock (Show) deriving newtype (Eq, Ord) Test cases: deriving/should_compile/T15798a deriving/should_compile/T15798c deriving/should_compile/T24955a deriving/should_compile/T24955b -} TcRnNoDerivingClauseStrategySpecified :: Map AssumedDerivingStrategy [LHsSigType GhcRn] -> TcRnNoDerivStratSpecifiedInfo {-| 'TcRnNoDerivStratSpecified TcRnNoStandaloneDerivingStrategySpecified' is a warning implied by -Wmissing-deriving-strategies and triggered by a standalone deriving declaration without a specified deriving strategy. Example: data T a = T a deriving instance Show a => Show (T a) Here we would suggest fixing the instance to: deriving stock instance Show a => Show (T a) Test cases: deriving/should_compile/T15798b deriving/should_compile/T24955c -} TcRnNoStandaloneDerivingStrategySpecified :: AssumedDerivingStrategy -> LHsSigWcType GhcRn -- ^ The instance signature (e.g @Show a => Show (T a)@) -> TcRnNoDerivStratSpecifiedInfo -- | Label for syntax that may occur in terms (expressions) only as part of a -- required type argument. data TypeSyntax = TypeKeywordSyntax -- ^ @type t@ | ContextArrowSyntax -- ^ @ctx => t@ | FunctionArrowSyntax -- ^ @t1 -> t2@ | ForallTelescopeSyntax -- ^ @forall tvs. t@ deriving (forall x. TypeSyntax -> Rep TypeSyntax x) -> (forall x. Rep TypeSyntax x -> TypeSyntax) -> Generic TypeSyntax forall x. Rep TypeSyntax x -> TypeSyntax forall x. TypeSyntax -> Rep TypeSyntax x forall a. (forall x. a -> Rep a x) -> (forall x. Rep a x -> a) -> Generic a $cfrom :: forall x. TypeSyntax -> Rep TypeSyntax x from :: forall x. TypeSyntax -> Rep TypeSyntax x $cto :: forall x. Rep TypeSyntax x -> TypeSyntax to :: forall x. Rep TypeSyntax x -> TypeSyntax Generic typeSyntaxExtension :: TypeSyntax -> LangExt.Extension typeSyntaxExtension :: TypeSyntax -> Extension typeSyntaxExtension TypeSyntax TypeKeywordSyntax = Extension LangExt.ExplicitNamespaces typeSyntaxExtension TypeSyntax ContextArrowSyntax = Extension LangExt.RequiredTypeArguments typeSyntaxExtension TypeSyntax FunctionArrowSyntax = Extension LangExt.RequiredTypeArguments typeSyntaxExtension TypeSyntax ForallTelescopeSyntax = Extension LangExt.RequiredTypeArguments