GHC.Tc.Errors.Types

Main types

data TcRnMessage where

An error which might arise during typechecking/renaming.

Constructors

TcRnUnknownMessage :: UnknownDiagnostic -> TcRnMessage

Simply wraps an unknown Diagnostic message a. It can be used by plugins to provide custom diagnostic messages originated during typechecking/renaming.

TcRnMessageWithInfo

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.

Fields

• :: !UnitState

  The UnitState will allow us to pretty-print some diagnostics with more detail.

• -> !TcRnMessageDetailed
• -> TcRnMessage

TcRnWithHsDocContext :: !HsDocContext -> !TcRnMessage -> TcRnMessage

TcRnWithHsDocContext annotates an error message with the context in which it originated.

TcRnSolverReport :: SolverReportWithCtxt -> DiagnosticReason -> [GhcHint] -> 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 the TcSolverReportMsg datatype for an overview of the different errors.

TcRnRedundantConstraints

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.

Fields

• :: [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

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.

Fields

• :: Implication

  The implication containing a contradiction.

• -> SolverReportWithCtxt

  The contradiction.

• -> TcRnMessage

TcRnTypeDoesNotHaveFixedRuntimeRep :: !Type -> !FixedRuntimeRepProvenance -> !ErrInfo -> 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

TcRnImplicitLift :: Name -> !ErrInfo -> 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

TcRnUnusedPatternBinds :: HsBind GhcRn -> 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}

TcRnDodgyImports :: RdrName -> TcRnMessage

TcRnDodgyImports is a warning (controlled with -Wdodgy-imports) that occurs when a datatype T is imported with all constructors, i.e. 'T(..)', but has been exported abstractly, i.e. T.

Test cases: renameshould_compileT7167

TcRnDodgyExports :: Name -> TcRnMessage

TcRnDodgyExports is a warning (controlled by -Wdodgy-exports) that occurs when a datatype T is exported with all constructors, i.e. 'T(..)', but is it just a type synonym or a type/data family.

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: warningsshould_compileDodgyExports01

TcRnMissingImportList :: IE GhcPs -> 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: renameshould_compileT4489

TcRnUnsafeDueToPlugin :: 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

TcRnModMissingRealSrcSpan :: Module -> TcRnMessage

TcRnModMissingRealSrcSpan is an error that occurs when compiling a module that lacks an associated RealSrcSpan.

Test cases: None

TcRnIdNotExportedFromModuleSig :: Name -> 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: backpackshould_failbkpfail36

TcRnIdNotExportedFromLocalSig :: Name -> 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: backpackshould_failbkpfail30 backpackshould_failbkpfail31 backpackshould_failbkpfail34

TcRnShadowedName :: OccName -> ShadowedNameProvenance -> 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: typecheckshould_compileT10971a renameshould_compilern039 renameshould_compilern064 renameshould_compileT1972 renameshould_failT2723 renameshould_compileT3262 driver/werror

TcRnDuplicateWarningDecls :: !(LocatedN RdrName) -> !RdrName -> TcRnMessage

TcRnDuplicateWarningDecls is an error that occurs whenever a warning is declared twice.

Examples(s): None.

Test cases: None.

TcRnSimplifierTooManyIterations

TcRnDuplicateWarningDecls is an error that occurs whenever the constraint solver in the simplifier hits the iterations' limit.

Examples(s): None.

Test cases: None.

Fields

• :: Cts
• -> !IntWithInf

  The limit.

• -> WantedConstraints
• -> TcRnMessage

TcRnIllegalPatSynDecl :: !(LIdP GhcPs) -> 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: patsynshould_faillocal

TcRnLinearPatSyn :: !Type -> TcRnMessage

TcRnLinearPatSyn is an error that occurs whenever a pattern synonym signature uses a field that is not unrestricted.

Example(s): None

Test cases: linearshould_failLinearPatSyn2

TcRnEmptyRecordUpdate :: 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

TcRnIllegalFieldPunning :: !(Located RdrName) -> 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: parsershould_failRecordDotSyntaxFail12

TcRnIllegalWildcardsInRecord :: !RecordFieldPart -> 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: parsershould_failRecordWildCardsFail

TcRnIllegalWildcardInType

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

Fields

• :: Maybe Name

  the wildcard name, or Nothing for an anonymous wildcard

• -> !BadAnonWildcardContext
• -> TcRnMessage

TcRnDuplicateFieldName :: !RecordFieldPart -> NonEmpty RdrName -> TcRnMessage

TcRnDuplicateFieldName is an error that occurs whenever there are duplicate field names in a record.

Examples(s): None.

Test cases: None.

TcRnIllegalViewPattern :: !(Pat GhcPs) -> 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: parsershould_failViewPatternsFail

TcRnCharLiteralOutOfRange :: !Char -> TcRnMessage

TcRnCharLiteralOutOfRange is an error that occurs whenever a character is out of range.

Examples(s): None

Test cases: None

TcRnIllegalWildcardsInConstructor :: !Name -> TcRnMessage

TcRnIllegalWildcardsInConstructor is an error that occurs whenever the record wildcards '..' are used inside a constructor without labeled fields.

Examples(s): None

Test cases: None

TcRnIgnoringAnnotations :: [LAnnDecl GhcRn] -> 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

TcRnAnnotationInSafeHaskell :: TcRnMessage

TcRnAnnotationInSafeHaskell is an error that occurs if annotation pragmas are used in conjunction with Safe Haskell.

Example(s): None

Test cases: annotationsshould_failT10826

TcRnInvalidTypeApplication :: Type -> LHsWcType GhcRn -> 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: overloadedrecfldsshould_failoverloadedlabelsfail03 typecheckshould_failExplicitSpecificity1 typecheckshould_failExplicitSpecificity10 typecheckshould_failExplicitSpecificity2 typecheckshould_failT17173 typecheckshould_failVtaFail

TcRnTagToEnumMissingValArg :: 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

TcRnTagToEnumUnspecifiedResTy :: Type -> 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: typecheckshould_failtcfail164

TcRnTagToEnumResTyNotAnEnum :: 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: typecheckshould_failtcfail164

TcRnArrowIfThenElsePredDependsOnResultTy :: 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

TcRnIllegalHsBootFileDecl :: TcRnMessage

TcRnIllegalHsBootFileDecl is an error that occurs when an hs-boot file contains declarations that are not allowed, such as bindings.

Example(s): None

Test cases: None

TcRnRecursivePatternSynonym :: LHsBinds GhcRn -> 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: patsynshould_failT16900

TcRnPartialTypeSigTyVarMismatch

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-sigsshould_failT14449

Fields

• :: Name

  first type variable

• -> Name

  second type variable

• -> Name

  function name

• -> LHsSigWcType GhcRn
• -> TcRnMessage

TcRnPartialTypeSigBadQuantifier

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-sigshould_failT14479

Fields

• :: 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

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

Test cases: T11077 (top-level bindings) T12484 (pattern synonyms) T19564 (kind signatures)

Fields

• :: MissingSignature
• -> Exported
• -> Bool

  True: -Wmissing-signatures overrides -Wmissing-exported-signatures, or -Wmissing-pattern-synonym-signatures overrides -Wmissing-exported-pattern-synonym-signatures

• -> TcRnMessage

TcRnPolymorphicBinderMissingSig :: Name -> Type -> 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: warningsshould_compileT12574

TcRnOverloadedSig :: TcIdSigInfo -> 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: typecheckshould_compileT11339

TcRnTupleConstraintInst :: !Class -> 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

TcRnAbstractClassInst :: !Class -> TcRnMessage

TcRnAbstractClassInst is an error that occurs whenever an instance of an abstract class is specified.

Examples(s): -- 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
• - Main.hs import A main = print (f :: Int)

Test cases: typecheckshould_failT13068

TcRnNoClassInstHead :: !Type -> TcRnMessage

TcRnNoClassInstHead is an error that occurs whenever an instance head is not headed by a class.

Examples(s): instance c

Test cases: typecheckrenameT5513 typecheckrenameT16385

TcRnUserTypeError :: !Type -> 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: typecheckshould_failCustomTypeErrors02 typecheckshould_failCustomTypeErrors03

TcRnConstraintInKind :: !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: dependentshould_failT13895 polykinds/T16263 saksshould_failsaks_fail004 typecheckshould_failT16059a typecheckshould_failT18714

TcRnUnboxedTupleOrSumTypeFuncArg

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: derivingshould_failT15073.hs derivingshould_failT15073a.hs typecheckshould_failT16059d

Fields

• :: UnboxedTupleOrSum

  whether this is an unboxed tuple or an unboxed sum

• -> !Type
• -> TcRnMessage

TcRnLinearFuncInKind :: !Type -> TcRnMessage

TcRnLinearFuncInKind is an error that occurs whenever a linear function is specified in a kind.

Examples(s): data A :: * %1 -> *

Test cases: linearshould_failLinearKind linearshould_failLinearKind2 linearshould_failLinearKind3

TcRnForAllEscapeError :: !Type -> !Kind -> 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-datatypesshould_failUnlDataNullaryPoly

TcRnVDQInTermType :: !(Maybe Type) -> 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: dependentshould_failT15859 dependentshould_failT16326_Fail1 dependentshould_failT16326_Fail2 dependentshould_failT16326_Fail3 dependentshould_failT16326_Fail4 dependentshould_failT16326_Fail5 dependentshould_failT16326_Fail6 dependentshould_failT16326_Fail7 dependentshould_failT16326_Fail8 dependentshould_failT16326_Fail9 dependentshould_failT16326_Fail10 dependentshould_failT16326_Fail11 dependentshould_failT16326_Fail12 dependentshould_failT17687 dependentshould_failT18271

TcRnBadQuantPredHead :: !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

TcRnIllegalTupleConstraint :: !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: typecheckshould_failtcfail209a

TcRnNonTypeVarArgInConstraint :: !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: ghciscriptsT13202 ghciscriptsT13202a polykinds/T12055a typecheckshould_failT10351 typecheckshould_failT19187 typecheckshould_failT6022 typecheckshould_failT8883

TcRnIllegalImplicitParam :: !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 typecheckshould_failT8912 typecheckshould_failtcfail041 typecheckshould_failtcfail211 typecheckshould_failtcrun045

TcRnIllegalConstraintSynonymOfKind :: !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: typecheckshould_failtcfail209

TcRnIllegalClassInst :: !TyConFlavour -> TcRnMessage

TcRnIllegalClassInst is an error that occurs whenever a class instance is specified for a non-class.

Examples(s): type C1 a = (Show (a -> Bool)) instance C1 Int where

Test cases: polykinds/T13267

TcRnOversaturatedVisibleKindArg :: !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: typecheckshould_failT15793 typecheckshould_failT16255

TcRnBadAssociatedType :: !Name -> !Name -> TcRnMessage

TcRnBadAssociatedType is an error that occurs whenever a class doesn't have an 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

TcRnForAllRankErr :: !Rank -> !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: - ghcishould_runT15806 - indexed-typesshould_failSimpleFail15 - typecheckshould_failT11355 - typecheckshould_failT12083a - typecheckshould_failT12083b - typecheckshould_failT16059c - typecheckshould_failT16059e - typecheckshould_failT17213 - typecheckshould_failT18939_Fail - typecheckshould_failT2538 - typecheckshould_failT5957 - typecheckshould_failT7019 - typecheckshould_failT7019a - typecheckshould_failT7809 - typecheckshould_failT9196 - typecheckshould_failtcfail127 - typecheckshould_failtcfail184 - typecheckshould_failtcfail196 - typecheckshould_failtcfail197

TcRnMonomorphicBindings :: [Name] -> TcRnMessage

TcRnMonomorphicBindings is a warning (controlled by -Wmonomorphism-restriction) that arise 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: typecheckshould_compileT13785

TcRnOrphanInstance :: ClsInst -> TcRnMessage

TcRnOrphanInstance is a warning (controlled by -Wwarn-orphans) that arises when a typeclass instance is an "orphan", i.e. if it appears in a module in which neither the class nor the type being instanced are declared in the same module.

Examples(s): None

Test cases: warningsshould_compileT9178 typecheckshould_compileT4912

TcRnFunDepConflict :: !UnitState -> NonEmpty ClsInst -> TcRnMessage

TcRnFunDepConflict is an error that occurs when there are functional dependencies conflicts between instance declarations.

Examples(s): None

Test cases: typecheckshould_failT2307 typecheckshould_failtcfail096 typecheckshould_failtcfail202

TcRnDupInstanceDecls :: !UnitState -> 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: cabalT12733T12733 typecheckshould_failtcfail035 typecheckshould_failtcfail023 backpackshould_failbkpfail18 typecheckshould_failTcNullaryTCFail typecheckshould_failtcfail036 typecheckshould_failtcfail073 module/mod51 module/mod52 module/mod44

TcRnConflictingFamInstDecls :: NonEmpty FamInst -> TcRnMessage

TcRnConflictingFamInstDecls is an error that occurs when there are conflicting family instance declarations.

Examples(s): None.

Test cases: indexed-typesshould_failExplicitForAllFams4b indexed-typesshould_failNoGood indexed-typesshould_failOver indexed-typesshould_failOverDirectThisMod indexed-typesshould_failOverIndirectThisMod indexed-typesshould_failSimpleFail11a indexed-typesshould_failSimpleFail11b indexed-typesshould_failSimpleFail11c indexed-typesshould_failSimpleFail11d indexed-typesshould_failSimpleFail2a indexed-typesshould_failSimpleFail2b indexed-typesshould_failT13092/T13092 indexed-typesshould_failT13092c/T13092c indexed-typesshould_failT14179 indexed-typesshould_failT2334A indexed-typesshould_failT2677 indexed-typesshould_failT3330b indexed-typesshould_failT4246 indexed-typesshould_failT7102a indexed-typesshould_failT9371 polykinds/T7524 typecheckshould_failUnliftedNewtypesOverlap

TcRnFamInstNotInjective :: InjectivityErrReason -> TyCon -> NonEmpty CoAxBranch -> TcRnMessage

TcRnBangOnUnliftedType :: !Type -> 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: typecheckshould_compileT20187a typecheckshould_compileT20187b

TcRnLazyBangOnUnliftedType :: !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: typecheckshould_compileT21951a typecheckshould_compileT21951b

TcRnMultipleDefaultDeclarations :: [LDefaultDecl GhcRn] -> TcRnMessage

TcRnMultipleDefaultDeclarations is an error that occurs when a module has more than one default declaration.

Example: default (Integer, Int) default (Double, Float) -- 2nd default declaration not allowed

Text cases: module/mod58

TcRnBadDefaultType :: Type -> [Class] -> 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: typecheckshould_failT11974b

TcRnPatSynBundledWithNonDataCon :: 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: patsynshould_failexport-class

TcRnPatSynBundledWithWrongType :: Type -> Type -> 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: patsynshould_failexport-ps-rec-sel patsynshould_failexport-type-synonym patsynshould_failexport-type

TcRnDupeModuleExport :: ModuleName -> 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

TcRnExportedModNotImported :: 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 renameshould_failrnfail028 backpackshould_failbkpfail48

TcRnNullExportedModule :: 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

TcRnMissingExportList :: 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: typecheckshould_failMissingExportList03

TcRnExportHiddenComponents :: IE GhcPs -> 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

TcRnDuplicateExport :: GreName -> IE GhcPs -> 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 overloadedrecfldsshould_failDuplicateExports patsynshould_compileT11959

TcRnExportedParentChildMismatch :: Name -> TyThing -> GreName -> [Name] -> 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 overloadedrecfldsshould_failNoParent

TcRnConflictingExports

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 overloadedrecfldsshould_failT14953 overloadedrecfldsshould_failoverloadedrecfldsfail10 renameshould_failrnfail029 renameshould_failrnfail040 typecheckshould_failT16453E2 typecheckshould_failtcfail025 typecheckshould_failtcfail026

Fields

• :: OccName

  Occurrence name shared by both exports

• -> GreName

  Name of first export

• -> GlobalRdrElt

  Provenance for definition site of first export

• -> IE GhcPs

  Export decl of first export

• -> GreName

  Name of second export

• -> GlobalRdrElt

  Provenance for definition site of second export

• -> IE GhcPs

  Export decl of second export

• -> TcRnMessage

TcRnAmbiguousField

TcRnAmbiguousField is a warning controlled by -Wambiguous-fields occurring when a record update's type cannot be precisely determined. 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: overloadedrecfldsshould_failoverloadedrecfldsfail06

Fields

• :: HsExpr GhcRn

  Field update

• -> TyCon

  Record type

• -> TcRnMessage

TcRnMissingFields :: ConLike -> [(FieldLabelString, TcType)] -> 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: deSugarshould_compileT13870 deSugarshould_compileds041 patsynshould_compileT11283 renameshould_compileT5334 renameshould_compileT12229 renameshould_compileT5892a warningsshould_failWerrorFail2

TcRnFieldUpdateInvalidType :: [(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: patsynshould_failrecords-exquant typecheckshould_failT3323

TcRnNoConstructorHasAllFields :: [FieldLabelString] -> TcRnMessage

TcRnNoConstructorHasAllFields is an error that occurs when a record update has fields that no single constructor encompasses.

Example(s): data Foo = A { x :: Bool } | B { y :: Int } foo = (A False) { x = True, y = 5 }

Test cases: overloadedrecfldsshould_failoverloadedrecfldsfail08 patsynshould_failmixed-pat-syn-record-sels typecheckshould_failT7989

TcRnMixedSelectors

Fields

• :: Name

  Record

• -> [Id]

  Record selectors

• -> Name

  Pattern synonym

• -> [Id]

  Pattern selectors

• -> TcRnMessage

TcRnMissingStrictFields :: ConLike -> [(FieldLabelString, TcType)] -> TcRnMessage

TcRnNoPossibleParentForFields :: [LHsRecUpdField GhcRn] -> TcRnMessage

TcRnBadOverloadedRecordUpdate :: [LHsRecUpdField GhcRn] -> TcRnMessage

TcRnStaticFormNotClosed :: Name -> NotClosedReason -> TcRnMessage

TcRnSpecialClassInst

TcRnSpecialClassInst is an error that occurs when a user attempts to define an instance for a built-in typeclass such as Coercible, Typeable, or KnownNat, outside of a signature file.

Test cases: derivingshould_failT9687 derivingshould_failT14916 polykinds/T8132 typecheckshould_failTcCoercibleFail2 typecheckshould_failT12837 typecheckshould_failT14390

Fields

• :: !Class
• -> !Bool

  Whether the error is due to Safe Haskell being enabled

• -> TcRnMessage

TcRnUselessTypeable :: 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: warningsshould_compileDerivingTypeable

TcRnDerivingDefaults :: !Class -> 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: typecheckshould_compileT15839a derivingshould_compileT16179

TcRnNonUnaryTypeclassConstraint :: !(LHsSigType GhcRn) -> 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: derivingshould_failT7959 derivingshould_faildrvfail005 derivingshould_faildrvfail009 derivingshould_faildrvfail006

TcRnPartialTypeSignatures :: !SuggestPartialTypeSignatures -> !ThetaType -> 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: dependentshould_compileT11241 dependentshould_compileT15076 dependentshould_compileT14880-2 typecheckshould_compileT17024 typecheckshould_compileT10072 partial-sigsshould_failTidyClash2 partial-sigsshould_failDefaulting1MROff partial-sigsshould_failWildcardsInPatternAndExprSig partial-sigsshould_failT10615 partial-sigsshould_failT14584a partial-sigsshould_failTidyClash partial-sigsshould_failT11122 partial-sigsshould_failT14584 partial-sigsshould_failT10045 partial-sigsshould_failPartialTypeSignaturesDisabled partial-sigsshould_failT10999 partial-sigsshould_failExtraConstraintsWildcardInExpressionSignature partial-sigsshould_failExtraConstraintsWildcardInPatternSplice partial-sigsshould_failWildcardInstantiations partial-sigsshould_runT15415 partial-sigsshould_compileT10463 partial-sigsshould_compileT15039a partial-sigsshould_compileT16728b partial-sigsshould_compileT15039c partial-sigsshould_compileT10438 partial-sigsshould_compileSplicesUsed partial-sigsshould_compileT18008 partial-sigsshould_compileExprSigLocal partial-sigsshould_compileT11339a partial-sigsshould_compileT11670 partial-sigsshould_compileWarningWildcardInstantiations partial-sigsshould_compileT16728 partial-sigsshould_compileT12033 partial-sigsshould_compileT15039b partial-sigsshould_compileT10403 partial-sigsshould_compileT11192 partial-sigsshould_compileT16728a partial-sigsshould_compileTypedSplice partial-sigsshould_compileT15039d partial-sigsshould_compileT11016 partial-sigsshould_compileT13324_compile2 linearshould_failLinearPartialSig polykinds/T14265 polykinds/T14172

TcRnCannotDeriveInstance

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: genericsT10604T10604_no_PolyKinds derivingshould_faildrvfail009 derivingshould_faildrvfail-functor2 derivingshould_failT10598_fail3 derivingshould_failderiving-via-fail2 derivingshould_failderiving-via-fail derivingshould_failT16181

Fields

• :: !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 :: TcRnMessage

TcRnLazyGADTPattern is an error that occurs when a user writes a nested GADT pattern match inside a lazy (~) pattern.

Test case: gadt/lazypat

TcRnArrowProcGADTPattern :: TcRnMessage

TcRnArrowProcGADTPattern is an error that occurs when a user writes a GADT pattern inside arrow proc notation.

Test case: arrowsshould_failarrowfail004.

TcRnForallIdentifier :: RdrName -> TcRnMessage

TcRnForallIdentifier is a warning (controlled with -Wforall-identifier) that occurs when a definition uses forall as an identifier.

Example: forall x = () g forall = ()

Test cases: T20609 T20609a T20609b T20609c T20609d

TcRnTypeEqualityOutOfScope :: 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: T18862b

TcRnTypeEqualityRequiresOperators :: 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

TcRnIllegalTypeOperator :: !SDoc -> !RdrName -> 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

TcRnIllegalTypeOperatorDecl :: !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

TcRnGADTMonoLocalBinds :: 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

TcRnNotInScope

The TcRnNotInScope constructor is used for various not-in-scope errors. See NotInScopeError for more details.

Fields

• :: 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

TcRnUntickedPromotedThing :: UntickedPromotedThing -> 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.

TcRnIllegalBuiltinSyntax

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.

Fields

• :: SDoc

  what kind of thing this is (a binding, fixity declaration, ...)

• -> RdrName
• -> TcRnMessage

TcRnWarnDefaulting

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.

Fields

• :: [Ct]

  Wanted constraints in which defaulting occurred

• -> Maybe TyVar

  The type variable being defaulted

• -> Type

  The default type

• -> TcRnMessage

TcRnIncorrectNameSpace

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:

f x = Int

Test cases: T18740a, T20884.

Fields

• :: Name
• -> Bool

  whether the error is happening in a Template Haskell tick (so we should give a Template Haskell hint)

• -> TcRnMessage

TcRnForeignImportPrimExtNotSet :: ForeignImport GhcRn -> TcRnMessage

TcRnForeignImportPrimSafeAnn :: ForeignImport GhcRn -> TcRnMessage

TcRnForeignFunctionImportAsValue :: ForeignImport GhcRn -> TcRnMessage

TcRnFunPtrImportWithoutAmpersand :: ForeignImport GhcRn -> TcRnMessage

TcRnIllegalForeignDeclBackend :: Either (ForeignExport GhcRn) (ForeignImport GhcRn) -> Backend -> ExpectedBackends -> TcRnMessage

TcRnUnsupportedCallConv :: Either (ForeignExport GhcRn) (ForeignImport GhcRn) -> UnsupportedCallConvention -> TcRnMessage

TcRnIllegalForeignType :: !(Maybe ArgOrResult) -> !IllegalForeignTypeReason -> TcRnMessage

TcRnInvalidCIdentifier :: !CLabelString -> TcRnMessage

TcRnExpectedValueId :: !TcTyThing -> TcRnMessage

TcRnNotARecordSelector :: !Name -> TcRnMessage

TcRnRecSelectorEscapedTyVar :: !OccName -> TcRnMessage

TcRnPatSynNotBidirectional :: !Name -> TcRnMessage

TcRnSplicePolymorphicLocalVar :: !Id -> TcRnMessage

TcRnIllegalDerivingItem :: !(LHsSigType GhcRn) -> TcRnMessage

TcRnUnexpectedAnnotation :: !(HsType GhcRn) -> !HsSrcBang -> TcRnMessage

TcRnIllegalRecordSyntax :: !(HsType GhcRn) -> TcRnMessage

TcRnUnexpectedTypeSplice :: !(HsType GhcRn) -> TcRnMessage

TcRnInvalidVisibleKindArgument

Fields

• :: !(LHsType GhcRn)

  The visible kind argument

• -> !Type

  Target of the kind application

• -> TcRnMessage

TcRnTooManyBinders :: !Kind -> ![LHsTyVarBndr () GhcRn] -> TcRnMessage

TcRnDifferentNamesForTyVar :: !Name -> !Name -> TcRnMessage

TcRnInvalidReturnKind

Fields

• :: !DataSort

  classification of thing being returned

• -> !AllowedDataResKind

  allowed kind

• -> !Kind

  the return kind

• -> !(Maybe SuggestUnliftedTypes)

  suggested extension

• -> TcRnMessage

TcRnClassKindNotConstraint :: !Kind -> TcRnMessage

TcRnUnpromotableThing :: !Name -> !PromotionErr -> TcRnMessage

TcRnMatchesHaveDiffNumArgs :: !MatchArgsContext -> !MatchArgBadMatches -> TcRnMessage

TcRnCannotBindScopedTyVarInPatSig :: !(NonEmpty (Name, TcTyVar)) -> TcRnMessage

TcRnCannotBindTyVarsInPatBind :: !(NonEmpty (Name, TcTyVar)) -> TcRnMessage

TcRnTooManyTyArgsInConPattern

Fields

• :: !ConLike
• -> !Int

  Expected number of args

• -> !Int

  Actual number of args

• -> TcRnMessage

TcRnMultipleInlinePragmas

Fields

• :: !Id

  Target of the pragmas

• -> !(LocatedA InlinePragma)

  The first pragma

• -> !(NonEmpty (LocatedA InlinePragma))

  Other pragmas

• -> TcRnMessage

TcRnUnexpectedPragmas :: !Id -> !(NonEmpty (LSig GhcRn)) -> TcRnMessage

TcRnNonOverloadedSpecialisePragma :: !(LIdP GhcRn) -> TcRnMessage

TcRnSpecialiseNotVisible :: !Name -> TcRnMessage

TcRnNameByTemplateHaskellQuote :: !RdrName -> TcRnMessage

TcRnIllegalBindingOfBuiltIn :: !OccName -> TcRnMessage

TcRnPragmaWarning

Fields

• :: { pragma_warning_occ :: OccName
•    , pragma_warning_msg :: WarningTxt GhcRn
•    , pragma_warning_import_mod :: ModuleName
•    , pragma_warning_defined_mod :: ModuleName
•    } -> TcRnMessage

TcRnIllegalHsigDefaultMethods

TcRnIllegalHsigDefaultMethods is an error that occurs when a binding for a class default method is provided in a Backpack signature file.

Test case: bkpfail40

Fields

• :: !Name

  Name of the class

• -> NonEmpty (LHsBind GhcRn)

  default methods

• -> TcRnMessage

TcRnBadGenericMethod

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: testsuiteteststypecheckshould_failMissingDefaultMethodBinding.hs

Fields

• :: !Name

  Name of the class

• -> !Name

  Problematic method

• -> TcRnMessage

TcRnWarningMinimalDefIncomplete :: ClassMinimalDef -> 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: testsuitetestswarningsminimalWarnMinimal.hs:

TcRnDefaultMethodForPragmaLacksBinding

TcRnDefaultMethodForPragmaLacksBinding is an error that occurs when a default method pragma is missing an accompanying binding.

Test cases: testsuiteteststypecheckshould_failT5084.hs testsuiteteststypecheckshould_failT2354.hs

Fields

• :: Id

  method

• -> Sig GhcRn

  the pragma

• -> TcRnMessage

TcRnIgnoreSpecialisePragmaOnDefMethod :: !Name -> TcRnMessage

TcRnIgnoreSpecialisePragmaOnDefMethod is a warning that occurs when a specialise pragma is put on a default method.

Test cases: none

TcRnBadMethodErr

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: testsuiteteststh/T12387

Fields

• :: { badMethodErrClassName :: !Name
•    , badMethodErrMethodName :: !Name
•    } -> TcRnMessage

TcRnNoExplicitAssocTypeOrDefaultDeclaration :: Name -> TcRnMessage

TcRnNoExplicitAssocTypeOrDefaultDeclaration is an error that occurs when a class instance does not provide an expected associated type or default declaration.

Test cases: testsuitetestsderivingshould_compileT14094 testsuitetestsindexed-typesshould_compileSimple2 testsuiteteststypecheckshould_compiletc254

TcRnIllegalNewtype

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: testsuitetestsgadt/T14719 testsuitetestsindexed-typesshould_failT14033 testsuitetestsindexed-typesshould_failT2334A testsuitetestslinearshould_failLinearGADTNewtype testsuitetestsparsershould_failreadFail008 testsuitetestspolykinds/T11459 testsuiteteststypecheckshould_failT15523 testsuiteteststypecheckshould_failT15796 testsuiteteststypecheckshould_failT17955 testsuiteteststypecheckshould_failT18891a testsuiteteststypecheckshould_failT21447 testsuiteteststypecheckshould_failtcfail156

Fields

• :: DataCon
• -> Bool

  True if linear types enabled

• -> IllegalNewtypeReason
• -> TcRnMessage

TcRnIllegalTypeData :: TcRnMessage

TcRnIllegalTypeData is an error that occurs when a type data declaration occurs without the TypeOperators extension.

See Note [Type data declarations]

Test case: testsuiteteststype-datashould_failTDNoPragma

TcRnTypeDataForbids :: !TypeDataForbids -> 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: testsuiteteststype-datashould_failTDDeriving testsuiteteststype-datashould_failTDRecordsGADT testsuiteteststype-datashould_failTDRecordsH98 testsuiteteststype-datashould_failTDStrictnessGADT testsuiteteststype-datashould_failTDStrictnessH98

TcRnTypedTHWithPolyType :: !TcType -> TcRnMessage

TcRnTypedTHWithPolyType 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

TcRnSpliceThrewException

TcRnSpliceThrewException is an error that occurrs when running a template haskell splice throws an exception.

Example(s):

Test cases: annotationsshould_failannfail12 perfcompilerMultiLayerModulesTH_Make perfcompilerMultiLayerModulesTH_OneShot th/T10796b th/T19470 th/T19709d th/T5358 th/T5976 th/T7276a th/T8987 th/TH_exn1 th/TH_exn2 th/TH_runIO

Fields

• :: !SplicePhase
• -> !SomeException
• -> !String

  Result of showing the exception (cannot be done safely outside IO)

• -> !(LHsExpr GhcTc)
• -> !Bool
• -> TcRnMessage

TcRnInvalidTopDecl :: !(HsDecl GhcPs) -> TcRnMessage

TcRnInvalidTopDecl is a template haskell error occurring when one of the Decs passed to addTopDecls is not a function, value, annotation, or foreign import declaration.

Example(s):

Test cases:

TcRnNonExactName :: !RdrName -> TcRnMessage

TcRnNonExactName is a template haskell error for when a declaration being added is bound to a name that is not fully known.

Example(s):

Test cases:

TcRnAddInvalidCorePlugin

TcRnAddInvalidCorePlugin 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:

Fields

• :: !String

  Module name

• -> TcRnMessage

TcRnAddDocToNonLocalDefn :: !DocLoc -> TcRnMessage

TcRnAddDocToNonLocalDefn is a template haskell error for documentation being added to a definition which is not in the current module.

Example(s):

Test cases: showIfaceshould_failTHPutDocExternal

TcRnFailedToLookupThInstName :: !Type -> !LookupTHInstNameErrReason -> TcRnMessage

TcRnFailedToLookupThInstName is a template haskell error that occurrs when looking up an instance fails.

Example(s):

Test cases: showIfaceshould_failTHPutDocNonExistent

TcRnCannotReifyInstance :: !Type -> TcRnMessage

TcRnCannotReifyInstance 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:

TcRnCannotReifyOutOfScopeThing :: !Name -> TcRnMessage

TcRnCannotReifyOutOfScopeThing 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

TcRnCannotReifyThingNotInTypeEnv :: !Name -> TcRnMessage

TcRnCannotReifyThingNotInTypeEnv 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:

TcRnNoRolesAssociatedWithThing :: !TcTyThing -> TcRnMessage

TcRnNoRolesAssociatedWithName 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:

TcRnCannotRepresentType :: !UnrepresentableTypeDescr -> !Type -> TcRnMessage

TcRnCannotRepresentThing 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:

TcRnRunSpliceFailure

TcRnRunSpliceFailure 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/T17379a th/T17379b 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

Fields

• :: !(Maybe String)

  Name of the function used to run the splice

• -> !RunSpliceFailReason
• -> TcRnMessage

TcRnReportCustomQuasiError :: !Bool -> !String -> TcRnMessage

TcRnUserErrReported is an error or warning thrown using qReport from the Quasi instance of TcM.

Example(s):

Test cases:

TcRnInterfaceLookupError :: !Name -> !SDoc -> TcRnMessage

TcRnInterfaceLookupError is an error resulting from looking up a name in an interface file.

Example(s):

Test cases:

TcRnUnsatisfiedMinimalDef :: ClassMinimalDef -> 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: testsuiteteststypecheckprog001typecheck.prog001 testsuiteteststypecheckshould_compiletc126 testsuiteteststypecheckshould_compileT7903 testsuiteteststypecheckshould_compiletc116 testsuiteteststypecheckshould_compiletc175 testsuiteteststypecheckshould_compileHasKey testsuiteteststypecheckshould_compiletc125 testsuiteteststypecheckshould_compiletc078 testsuiteteststypecheckshould_compiletc161 testsuiteteststypecheckshould_failT5051 testsuiteteststypecheckshould_failT21583 testsuitetestsbackpackshould_compilebkp47 testsuitetestsbackpackshould_failbkpfail25 testsuitetestsparsershould_compileT2245 testsuitetestsparsershould_compileread014 testsuitetestsindexed-typesshould_compileClass3 testsuitetestsindexed-typesshould_compileSimple2 testsuitetestsindexed-typesshould_failT7862 testsuitetestsderivingshould_compilederiving-1935 testsuitetestsderivingshould_compileT9968a testsuitetestsderivingshould_compiledrv003 testsuitetestsderivingshould_compileT4966 testsuitetestsderivingshould_compileT14094 testsuitetestsperfcompilerT15304 testsuitetestswarningsminimalWarnMinimal testsuitetestssimplCoreshould_compilesimpl020 testsuitetestsdeSugarshould_compileT14546d testsuitetestsghciscriptsT5820 testsuitetestsghciscriptsghci019

TcRnMisplacedInstSig :: Name -> LHsSigType GhcRn -> 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: testsuitetestsmodule/mod45

TcRnBadBootFamInstDecl

TcRnBadBootFamInstDecl is an error that is triggered by a type family instance being declared in an hs-boot file.

Test case: testsuitetestsindexed-typesshould_failHsBootFam

Fields

•    } -> TcRnMessage

TcRnIllegalFamilyInstance :: TyCon -> TcRnMessage

TcRnIllegalFamilyInstance is an error that occurs when an associated type or data family is given a top-level instance.

Test case: testsuitetestsindexed-typesshould_failT3092

TcRnMissingClassAssoc :: TyCon -> TcRnMessage

TcRnMissingClassAssoc is an error that occurs when a class instance for a class with an associated type or data family is missing a corresponding family instance declaration.

Test case: testsuitetestsindexed-typesshould_failSimpleFail7

TcRnBadFamInstDecl :: TyCon -> TcRnMessage

TcRnBadFamInstDecl is an error that is triggered by a type or data family instance without the TypeFamilies extension.

Test case: testsuitetestsindexed-typesshould_failBadFamInstDecl

TcRnNotOpenFamily :: TyCon -> TcRnMessage

TcRnNotOpenFamily is an error that is triggered by attempting to give a top-level (open) type family instance for a closed type family.

Test cases: testsuitetestsindexed-typesshould_failOverlap7 testsuitetestsindexed-typesshould_failOverlap3

TcRnNoRebindableSyntaxRecordDot :: TcRnMessage

TcRnNoRebindableSyntaxRecordDot is an error triggered by an overloaded record update without RebindableSyntax enabled.

Example(s):

Test cases: parsershould_failRecordDotSyntaxFail5

TcRnNoFieldPunsRecordDot :: 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: parsershould_failRecordDotSyntaxFail12

TcRnIllegalStaticExpression :: HsExpr GhcPs -> 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

TcRnIllegalStaticFormInSplice :: HsExpr GhcPs -> TcRnMessage

TcRnIllegalStaticFormInSplice is an error when a user attempts to define a static pointer in a Template Haskell splice.

Example(s):

Test cases: th/TH_StaticPointers02

TcRnListComprehensionDuplicateBinding :: Name -> TcRnMessage

TcRnListComprehensionDuplicateBinding is an error triggered by duplicate let-bindings in a list comprehension.

Example(s): [ () | let a = 13 | let a = 17 ]

Test cases: typecheckshould_failtcfail092

TcRnEmptyStmtsGroup :: EmptyStatementGroupErrReason -> 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: renameshould_failRnEmptyStatementGroup1

TcRnLastStmtNotExpr :: HsStmtContext GhcRn -> UnexpectedStatement -> 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: renameshould_failT6060 parsershould_failT3811g parsershould_failreadFail028

TcRnUnexpectedStatementInContext :: HsStmtContext GhcRn -> UnexpectedStatement -> Maybe Extension -> 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: parsershould_failreadFail042 parsershould_failreadFail038 parsershould_failreadFail043

TcRnIllegalTupleSection :: TcRnMessage

TcRnIllegalTupleSection is an error triggered by usage of a tuple section without enabling the TupleSections extension.

Example(s): (5,)

Test cases: renameshould_failrnfail056

TcRnIllegalImplicitParameterBindings :: Either (HsLocalBindsLR GhcPs GhcPs) (HsLocalBindsLR GhcRn GhcPs) -> TcRnMessage

TcRnIllegalImplicitParameterBindings is an error triggered by binding an implicit parameter in an mdo block.

Example(s): mdo { let { ?x = 5 }; () }

Test cases: renameshould_failRnImplicitBindInMdoNotation

TcRnSectionWithoutParentheses :: HsExpr GhcPs -> TcRnMessage

TcRnSectionWithoutParentheses is an error triggered by attempting to use an operator section without parentheses.

Example(s): (head x, ())

Test cases: renameshould_failT2490 renameshould_failT5657

Instances

Generic TcRnMessage

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep TcRnMessage :: Type -> Type

Methods

from :: TcRnMessage -> Rep TcRnMessage x

to :: Rep TcRnMessage x -> TcRnMessage

Diagnostic TcRnMessage

Defined in GHC.Tc.Errors.Ppr

Associated Types

type DiagnosticOpts TcRnMessage

Methods

defaultDiagnosticOpts :: DiagnosticOpts TcRnMessage

diagnosticMessage :: DiagnosticOpts TcRnMessage -> TcRnMessage -> DecoratedSDoc

diagnosticReason :: TcRnMessage -> DiagnosticReason

diagnosticHints :: TcRnMessage -> [GhcHint]

diagnosticCode :: TcRnMessage -> Maybe DiagnosticCode

type Rep TcRnMessage

Defined in GHC.Tc.Errors.Types

type Rep TcRnMessage = D1 ('MetaData "TcRnMessage" "GHC.Tc.Errors.Types" "ghc" 'False) (((((((C1 ('MetaCons "TcRnUnknownMessage" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 UnknownDiagnostic)) :+: C1 ('MetaCons "TcRnMessageWithInfo" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 UnitState) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcRnMessageDetailed))) :+: (C1 ('MetaCons "TcRnWithHsDocContext" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 HsDocContext) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcRnMessage)) :+: (C1 ('MetaCons "TcRnSolverReport" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SolverReportWithCtxt) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 DiagnosticReason) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [GhcHint]))) :+: C1 ('MetaCons "TcRnRedundantConstraints" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Id]) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (SkolemInfoAnon, Bool)))))) :+: ((C1 ('MetaCons "TcRnInaccessibleCode" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Implication) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SolverReportWithCtxt)) :+: (C1 ('MetaCons "TcRnTypeDoesNotHaveFixedRuntimeRep" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 FixedRuntimeRepProvenance) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 ErrInfo))) :+: C1 ('MetaCons "TcRnImplicitLift" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 ErrInfo)))) :+: (C1 ('MetaCons "TcRnUnusedPatternBinds" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (HsBind GhcRn))) :+: (C1 ('MetaCons "TcRnDodgyImports" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RdrName)) :+: C1 ('MetaCons "TcRnDodgyExports" 'PrefixI 'False) (S1 ('MetaSel 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Name)) :+: C1 ('MetaCons "TcRnShadowedName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 OccName) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ShadowedNameProvenance))))) :+: ((C1 ('MetaCons "TcRnDuplicateWarningDecls" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (LocatedN RdrName)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 RdrName)) :+: (C1 ('MetaCons "TcRnSimplifierTooManyIterations" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Cts) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 IntWithInf) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 WantedConstraints))) :+: C1 ('MetaCons "TcRnIllegalPatSynDecl" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (LIdP GhcPs))))) :+: (C1 ('MetaCons "TcRnLinearPatSyn" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type)) :+: (C1 ('MetaCons "TcRnEmptyRecordUpdate" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TcRnIllegalFieldPunning" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (Located RdrName)))))))) :+: ((((C1 ('MetaCons "TcRnIllegalWildcardsInRecord" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 RecordFieldPart)) :+: C1 ('MetaCons "TcRnIllegalWildcardInType" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe Name)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 BadAnonWildcardContext))) :+: (C1 ('MetaCons "TcRnDuplicateFieldName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 RecordFieldPart) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (NonEmpty RdrName))) :+: (C1 ('MetaCons "TcRnIllegalViewPattern" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (Pat GhcPs))) :+: C1 ('MetaCons "TcRnCharLiteralOutOfRange" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Char))))) :+: ((C1 ('MetaCons "TcRnIllegalWildcardsInConstructor" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Name)) :+: (C1 ('MetaCons "TcRnIgnoringAnnotations" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [LAnnDecl GhcRn])) :+: C1 ('MetaCons "TcRnAnnotationInSafeHaskell" 'PrefixI 'False) (U1 :: Type -> Type))) :+: (C1 ('MetaCons "TcRnInvalidTypeApplication" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (LHsWcType GhcRn))) :+: (C1 ('MetaCons "TcRnTagToEnumMissingValArg" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TcRnTagToEnumUnspecifiedResTy" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type)))))) :+: (((C1 ('MetaCons "TcRnTagToEnumResTyNotAnEnum" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type)) :+: (C1 ('MetaCons "TcRnArrowIfThenElsePredDependsOnResultTy" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TcRnIllegalHsBootFileDecl" 'PrefixI 'False) (U1 :: Type -> Type))) :+: (C1 ('MetaCons "TcRnRecursivePatternSynonym" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (LHsBinds GhcRn))) :+: (C1 ('MetaCons "TcRnPartialTypeSigTyVarMismatch" 'PrefixI 'False) ((S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name)) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (LHsSigWcType GhcRn)))) :+: C1 ('MetaCons "TcRnPartialTypeSigBadQuantifier" 'PrefixI 'False) ((S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name)) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe Type)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (LHsSigWcType GhcRn))))))) :+: ((C1 ('MetaCons "TcRnMissingSignature" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 MissingSignature) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Exported) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Bool))) :+: (C1 ('MetaCons "TcRnPolymorphicBinderMissingSig" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 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Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SomeException)) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 String) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (LHsExpr GhcTc)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Bool)))) :+: C1 ('MetaCons "TcRnInvalidTopDecl" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (HsDecl GhcPs)))))) :+: ((C1 ('MetaCons "TcRnNonExactName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 RdrName)) :+: (C1 ('MetaCons "TcRnAddInvalidCorePlugin" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 String)) :+: C1 ('MetaCons "TcRnAddDocToNonLocalDefn" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 DocLoc)))) :+: (C1 ('MetaCons "TcRnFailedToLookupThInstName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 LookupTHInstNameErrReason)) :+: (C1 ('MetaCons "TcRnCannotReifyInstance" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type)) :+: C1 ('MetaCons "TcRnCannotReifyOutOfScopeThing" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Name))))))) :+: ((((C1 ('MetaCons "TcRnCannotReifyThingNotInTypeEnv" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Name)) :+: (C1 ('MetaCons "TcRnNoRolesAssociatedWithThing" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcTyThing)) :+: C1 ('MetaCons "TcRnCannotRepresentType" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 UnrepresentableTypeDescr) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type)))) :+: (C1 ('MetaCons "TcRnRunSpliceFailure" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (Maybe String)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 RunSpliceFailReason)) :+: (C1 ('MetaCons "TcRnReportCustomQuasiError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Bool) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 String)) :+: C1 ('MetaCons "TcRnInterfaceLookupError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Name) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SDoc))))) :+: ((C1 ('MetaCons "TcRnUnsatisfiedMinimalDef" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ClassMinimalDef)) :+: (C1 ('MetaCons "TcRnMisplacedInstSig" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (LHsSigType GhcRn))) :+: C1 ('MetaCons "TcRnBadBootFamInstDecl" 'PrefixI 'False) (U1 :: Type -> Type))) :+: (C1 ('MetaCons "TcRnIllegalFamilyInstance" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyCon)) :+: (C1 ('MetaCons "TcRnMissingClassAssoc" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyCon)) :+: C1 ('MetaCons "TcRnBadFamInstDecl" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyCon)))))) :+: (((C1 ('MetaCons "TcRnNotOpenFamily" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyCon)) :+: (C1 ('MetaCons "TcRnNoRebindableSyntaxRecordDot" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TcRnNoFieldPunsRecordDot" 'PrefixI 'False) (U1 :: Type -> Type))) :+: (C1 ('MetaCons "TcRnIllegalStaticExpression" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (HsExpr GhcPs))) :+: (C1 ('MetaCons "TcRnIllegalStaticFormInSplice" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (HsExpr GhcPs))) :+: C1 ('MetaCons "TcRnListComprehensionDuplicateBinding" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name))))) :+: ((C1 ('MetaCons "TcRnEmptyStmtsGroup" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 EmptyStatementGroupErrReason)) :+: (C1 ('MetaCons "TcRnLastStmtNotExpr" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (HsStmtContext GhcRn)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 UnexpectedStatement)) :+: C1 ('MetaCons "TcRnUnexpectedStatementInContext" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (HsStmtContext GhcRn)) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 UnexpectedStatement) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe Extension)))))) :+: (C1 ('MetaCons "TcRnIllegalTupleSection" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "TcRnIllegalImplicitParameterBindings" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Either (HsLocalBindsLR GhcPs GhcPs) (HsLocalBindsLR GhcRn GhcPs)))) :+: C1 ('MetaCons "TcRnSectionWithoutParentheses" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (HsExpr GhcPs)))))))))))

type DiagnosticOpts TcRnMessage

Defined in GHC.Tc.Errors.Ppr

type DiagnosticOpts TcRnMessage = TcRnMessageOpts

mkTcRnUnknownMessage :: (Diagnostic a, Typeable a, DiagnosticOpts a ~ NoDiagnosticOpts) => a -> TcRnMessage

data TcRnMessageDetailed

TcRnMessageDetailed is an "internal" type (used only inside Monad that wraps a TcRnMessage while also providing any extra info needed to correctly pretty-print this diagnostic later on.

Constructors

TcRnMessageDetailed

Fields

• !ErrInfo

  Extra info associated with the message

• !TcRnMessage

Instances

Generic TcRnMessageDetailed

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep TcRnMessageDetailed :: Type -> Type

Methods

from :: TcRnMessageDetailed -> Rep TcRnMessageDetailed x

to :: Rep TcRnMessageDetailed x -> TcRnMessageDetailed

type Rep TcRnMessageDetailed

Defined in GHC.Tc.Errors.Types

type Rep TcRnMessageDetailed = D1 ('MetaData "TcRnMessageDetailed" "GHC.Tc.Errors.Types" "ghc" 'False) (C1 ('MetaCons "TcRnMessageDetailed" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 ErrInfo) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TcRnMessage)))

data TypeDataForbids

Things forbidden in type data declarations. See Note [Type data declarations]

Constructors

TypeDataForbidsDatatypeContexts

TypeDataForbidsLabelledFields

TypeDataForbidsStrictnessAnnotations

TypeDataForbidsDerivingClauses

Instances

Generic TypeDataForbids

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep TypeDataForbids :: Type -> Type

Methods

from :: TypeDataForbids -> Rep TypeDataForbids x

to :: Rep TypeDataForbids x -> TypeDataForbids

Outputable TypeDataForbids

Defined in GHC.Tc.Errors.Types

Methods

ppr :: TypeDataForbids -> SDoc

type Rep TypeDataForbids

Defined in GHC.Tc.Errors.Types

type Rep TypeDataForbids = D1 ('MetaData "TypeDataForbids" "GHC.Tc.Errors.Types" "ghc" 'False) ((C1 ('MetaCons "TypeDataForbidsDatatypeContexts" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TypeDataForbidsLabelledFields" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "TypeDataForbidsStrictnessAnnotations" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "TypeDataForbidsDerivingClauses" 'PrefixI 'False) (U1 :: Type -> Type)))

data ErrInfo

Constructors

ErrInfo

Fields

• errInfoContext :: !SDoc

  Extra context associated to the error.

• errInfoSupplementary :: !SDoc

  Extra supplementary info associated to the error.

data FixedRuntimeRepProvenance

In what context did we require a type to have a fixed runtime representation?

Used by checkTypeHasFixedRuntimeRep for throwing representation polymorphism errors when validity checking.

See Note [Representation polymorphism checking] in GHC.Tc.Utils.Concrete

Constructors

FixedRuntimeRepDataConField

Data constructor fields must have a fixed runtime representation.

Tests: T11734, T18534.

FixedRuntimeRepPatSynSigArg

Pattern synonym signature arguments must have a fixed runtime representation.

Test: RepPolyPatSynArg.

FixedRuntimeRepPatSynSigRes

Pattern synonym signature scrutinee must have a fixed runtime representation.

Test: RepPolyPatSynRes.

pprFixedRuntimeRepProvenance :: FixedRuntimeRepProvenance -> SDoc

data ShadowedNameProvenance

Where a shadowed name comes from

Constructors

ShadowedNameProvenanceLocal !SrcLoc

The shadowed name is local to the module

ShadowedNameProvenanceGlobal [GlobalRdrElt]

The shadowed name is global, typically imported from elsewhere.

data RecordFieldPart

Which parts of a record field are affected by a particular error or warning.

Constructors

RecordFieldConstructor !Name

RecordFieldPattern !Name

RecordFieldUpdate

data IllegalNewtypeReason

Why the particular illegal newtype error arose together with more information, if any.

Constructors

DoesNotHaveSingleField !Int

IsNonLinear

IsGADT

HasConstructorContext

HasExistentialTyVar

HasStrictnessAnnotation

Instances

Generic IllegalNewtypeReason

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep IllegalNewtypeReason :: Type -> Type

Methods

from :: IllegalNewtypeReason -> Rep IllegalNewtypeReason x

to :: Rep IllegalNewtypeReason x -> IllegalNewtypeReason

type Rep IllegalNewtypeReason

Defined in GHC.Tc.Errors.Types

type Rep IllegalNewtypeReason = D1 ('MetaData "IllegalNewtypeReason" "GHC.Tc.Errors.Types" "ghc" 'False) ((C1 ('MetaCons "DoesNotHaveSingleField" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Int)) :+: (C1 ('MetaCons "IsNonLinear" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "IsGADT" 'PrefixI 'False) (U1 :: Type -> Type))) :+: (C1 ('MetaCons "HasConstructorContext" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "HasExistentialTyVar" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "HasStrictnessAnnotation" 'PrefixI 'False) (U1 :: Type -> Type))))

data InjectivityErrReason

Why the particular injectivity error arose together with more information, if any.

Constructors

InjErrRhsBareTyVar [Type]

InjErrRhsCannotBeATypeFam

InjErrRhsOverlap

InjErrCannotInferFromRhs !TyVarSet !HasKinds !SuggestUndecidableInstances

data HasKinds

Constructors

YesHasKinds

NoHasKinds

Instances

Show HasKinds

Defined in GHC.Tc.Errors.Types

Methods

showsPrec :: Int -> HasKinds -> ShowS

show :: HasKinds -> String

showList :: [HasKinds] -> ShowS

Eq HasKinds

Defined in GHC.Tc.Errors.Types

Methods

(==) :: HasKinds -> HasKinds -> Bool

(/=) :: HasKinds -> HasKinds -> Bool

hasKinds :: Bool -> HasKinds

data SuggestUndecidableInstances

Constructors

YesSuggestUndecidableInstaces

NoSuggestUndecidableInstaces

Instances

Show SuggestUndecidableInstances

Defined in GHC.Tc.Errors.Types

Methods

showsPrec :: Int -> SuggestUndecidableInstances -> ShowS

show :: SuggestUndecidableInstances -> String

showList :: [SuggestUndecidableInstances] -> ShowS

Eq SuggestUndecidableInstances

Defined in GHC.Tc.Errors.Types

Methods

(==) :: SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool

(/=) :: SuggestUndecidableInstances -> SuggestUndecidableInstances -> Bool

suggestUndecidableInstances :: Bool -> SuggestUndecidableInstances

data SuggestUnliftedTypes

Constructors

SuggestUnliftedNewtypes

SuggestUnliftedDatatypes

data DataSort

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.

Constructors

DataDeclSort NewOrData

DataInstanceSort NewOrData

DataFamilySort

ppDataSort :: DataSort -> SDoc

data AllowedDataResKind

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.

Constructors

AnyTYPEKind

AnyBoxedKind

LiftedKind

data NotClosedReason

A data type to describe why a variable is not closed. See Note [Not-closed error messages] in GHC.Tc.Gen.Expr

Constructors

NotLetBoundReason

NotTypeClosed VarSet

NotClosed Name NotClosedReason

data SuggestPartialTypeSignatures

Constructors

YesSuggestPartialTypeSignatures

NoSuggestPartialTypeSignatures

Instances

Show SuggestPartialTypeSignatures

Defined in GHC.Tc.Errors.Types

Methods

showsPrec :: Int -> SuggestPartialTypeSignatures -> ShowS

show :: SuggestPartialTypeSignatures -> String

showList :: [SuggestPartialTypeSignatures] -> ShowS

Eq SuggestPartialTypeSignatures

Defined in GHC.Tc.Errors.Types

Methods

(==) :: SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool

(/=) :: SuggestPartialTypeSignatures -> SuggestPartialTypeSignatures -> Bool

suggestPartialTypeSignatures :: Bool -> SuggestPartialTypeSignatures

data DeriveInstanceErrReason

Why a particular typeclass instance couldn't be derived.

Constructors

DerivErrNotWellKinded

The typeclass instance is not well-kinded.

Fields

• !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

DerivErrGNDUsedOnData

We cannot use GND on non-newtype types

DerivErrNullaryClasses

We cannot derive instances of nullary classes

DerivErrLastArgMustBeApp

Last arg must be newtype or data application

DerivErrNoFamilyInstance !TyCon [Type]

DerivErrNotStockDeriveable !DeriveAnyClassEnabled

DerivErrHasAssociatedDatatypes !HasAssociatedDataFamInsts !AssociatedTyLastVarInKind !AssociatedTyNotParamOverLastTyVar

DerivErrNewtypeNonDeriveableClass

DerivErrCannotEtaReduceEnough !Bool

DerivErrOnlyAnyClassDeriveable

Fields

• !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

DerivErrNotAClass !PredType

The given PredType is not a class.

DerivErrNoConstructors !TyCon

The given (representation of the) TyCon has no data constructors.

DerivErrLangExtRequired !Extension

DerivErrDunnoHowToDeriveForType !Type

GHC simply doesn't how to how derive the input Class for the given Type.

DerivErrMustBeEnumType !TyCon

The given TyCon must be an enumeration. See Note [Enumeration types] in GHC.Core.TyCon

DerivErrMustHaveExactlyOneConstructor !TyCon

The given TyCon must have precisely one constructor.

DerivErrMustHaveSomeParameters !TyCon

The given data type must have some parameters.

DerivErrMustNotHaveClassContext !TyCon !ThetaType

The given data type must not have a class context.

DerivErrBadConstructor !(Maybe HasWildcard) [DeriveInstanceBadConstructor]

We couldn't derive an instance for a particular data constructor for a variety of reasons.

DerivErrGenerics [DeriveGenericsErrReason]

We couldn't derive a Generic instance for the given type for a variety of reasons

DerivErrEnumOrProduct !DeriveInstanceErrReason !DeriveInstanceErrReason

We couldn't derive an instance either because the type was not an enum type or because it did have more than one constructor.

Instances

Generic DeriveInstanceErrReason

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep DeriveInstanceErrReason :: Type -> Type

Methods

from :: DeriveInstanceErrReason -> Rep DeriveInstanceErrReason x

to :: Rep DeriveInstanceErrReason x -> DeriveInstanceErrReason

type Rep DeriveInstanceErrReason

Defined in GHC.Tc.Errors.Types

type Rep DeriveInstanceErrReason = D1 ('MetaData "DeriveInstanceErrReason" "GHC.Tc.Errors.Types" "ghc" 'False) ((((C1 ('MetaCons "DerivErrNotWellKinded" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Kind) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Int))) :+: (C1 ('MetaCons "DerivErrSafeHaskellGenericInst" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "DerivErrDerivingViaWrongKind" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Kind) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Kind))))) :+: (C1 ('MetaCons "DerivErrNoEtaReduce" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type)) :+: (C1 ('MetaCons "DerivErrBootFileFound" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "DerivErrDataConsNotAllInScope" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon))))) :+: ((C1 ('MetaCons "DerivErrGNDUsedOnData" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "DerivErrNullaryClasses" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "DerivErrLastArgMustBeApp" 'PrefixI 'False) (U1 :: Type -> Type))) :+: ((C1 ('MetaCons "DerivErrNoFamilyInstance" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Type])) :+: C1 ('MetaCons "DerivErrNotStockDeriveable" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 DeriveAnyClassEnabled))) :+: (C1 ('MetaCons "DerivErrHasAssociatedDatatypes" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 HasAssociatedDataFamInsts) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 AssociatedTyLastVarInKind) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 AssociatedTyNotParamOverLastTyVar))) :+: C1 ('MetaCons "DerivErrNewtypeNonDeriveableClass" 'PrefixI 'False) (U1 :: Type -> Type))))) :+: (((C1 ('MetaCons "DerivErrCannotEtaReduceEnough" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Bool)) :+: (C1 ('MetaCons "DerivErrOnlyAnyClassDeriveable" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 DeriveAnyClassEnabled)) :+: C1 ('MetaCons "DerivErrNotDeriveable" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 DeriveAnyClassEnabled)))) :+: ((C1 ('MetaCons "DerivErrNotAClass" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 PredType)) :+: C1 ('MetaCons "DerivErrNoConstructors" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon))) :+: (C1 ('MetaCons "DerivErrLangExtRequired" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Extension)) :+: C1 ('MetaCons "DerivErrDunnoHowToDeriveForType" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type))))) :+: ((C1 ('MetaCons "DerivErrMustBeEnumType" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon)) :+: (C1 ('MetaCons "DerivErrMustHaveExactlyOneConstructor" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon)) :+: C1 ('MetaCons "DerivErrMustHaveSomeParameters" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon)))) :+: ((C1 ('MetaCons "DerivErrMustNotHaveClassContext" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TyCon) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 ThetaType)) :+: C1 ('MetaCons "DerivErrBadConstructor" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (Maybe HasWildcard)) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [DeriveInstanceBadConstructor]))) :+: (C1 ('MetaCons "DerivErrGenerics" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [DeriveGenericsErrReason])) :+: C1 ('MetaCons "DerivErrEnumOrProduct" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 DeriveInstanceErrReason) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 DeriveInstanceErrReason)))))))

data UsingGeneralizedNewtypeDeriving

Constructors

YesGeneralizedNewtypeDeriving

NoGeneralizedNewtypeDeriving

Instances

Eq UsingGeneralizedNewtypeDeriving

Defined in GHC.Tc.Errors.Types

Methods

(==) :: UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool

(/=) :: UsingGeneralizedNewtypeDeriving -> UsingGeneralizedNewtypeDeriving -> Bool

usingGeneralizedNewtypeDeriving :: Bool -> UsingGeneralizedNewtypeDeriving

data DeriveAnyClassEnabled

Constructors

YesDeriveAnyClassEnabled

NoDeriveAnyClassEnabled

Instances

Eq DeriveAnyClassEnabled

Defined in GHC.Tc.Errors.Types

Methods

(==) :: DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool

(/=) :: DeriveAnyClassEnabled -> DeriveAnyClassEnabled -> Bool

deriveAnyClassEnabled :: Bool -> DeriveAnyClassEnabled

data DeriveInstanceBadConstructor

Constructors

DerivErrBadConExistential !DataCon

The given DataCon must be truly polymorphic in the last argument of the data type.

DerivErrBadConCovariant !DataCon

The given DataCon must not use the type variable in a function argument"

DerivErrBadConFunTypes !DataCon

The given DataCon must not contain function types

DerivErrBadConWrongArg !DataCon

The given DataCon must use the type variable only as the last argument of a data type

DerivErrBadConIsGADT !DataCon

The given DataCon is a GADT so we cannot directly derive an istance for it.

DerivErrBadConHasExistentials !DataCon

The given DataCon has existentials type vars in its type.

DerivErrBadConHasConstraints !DataCon

The given DataCon has constraints in its type.

DerivErrBadConHasHigherRankType !DataCon

The given DataCon has a higher-rank type.

data HasWildcard

Constructors

YesHasWildcard

NoHasWildcard

Instances

Eq HasWildcard

Defined in GHC.Tc.Errors.Types

Methods

(==) :: HasWildcard -> HasWildcard -> Bool

(/=) :: HasWildcard -> HasWildcard -> Bool

hasWildcard :: Bool -> HasWildcard

data BadAnonWildcardContext

A context in which we don't allow anonymous wildcards.

Constructors

WildcardNotLastInConstraint

ExtraConstraintWildcardNotAllowed SoleExtraConstraintWildcardAllowed

WildcardsNotAllowedAtAll

data SoleExtraConstraintWildcardAllowed

Whether a sole extra-constraint wildcard is allowed, e.g. _ => .. as opposed to ( .., _ ) => ...

Constructors

SoleExtraConstraintWildcardNotAllowed

SoleExtraConstraintWildcardAllowed

data DeriveGenericsErrReason

Constructors

DerivErrGenericsMustNotHaveDatatypeContext !TyCon

The type must not have some datatype context.

DerivErrGenericsMustNotHaveExoticArgs !DataCon

The data constructor must not have exotic unlifted or polymorphic arguments.

DerivErrGenericsMustBeVanillaDataCon !DataCon

The data constructor must be a vanilla constructor.

DerivErrGenericsMustHaveSomeTypeParams !TyCon

The type must have some type parameters. check (d) from Note [Requirements for deriving Generic and Rep] in GHC.Tc.Deriv.Generics.

DerivErrGenericsMustNotHaveExistentials !DataCon

The data constructor must not have existential arguments.

DerivErrGenericsWrongArgKind !DataCon

The derivation applies a type to an argument involving the last parameter but the applied type is not of kind * -> *.

data HasAssociatedDataFamInsts

A type representing whether or not the input type has associated data family instances.

Constructors

YesHasAdfs

NoHasAdfs

Instances

Eq HasAssociatedDataFamInsts

Defined in GHC.Tc.Errors.Types

Methods

(==) :: HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool

(/=) :: HasAssociatedDataFamInsts -> HasAssociatedDataFamInsts -> Bool

hasAssociatedDataFamInsts :: Bool -> HasAssociatedDataFamInsts

data AssociatedTyLastVarInKind

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.

Constructors

YesAssocTyLastVarInKind !TyCon

The associated type family of the class

NoAssocTyLastVarInKind

Instances

Eq AssociatedTyLastVarInKind

Defined in GHC.Tc.Errors.Types

Methods

(==) :: AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool

(/=) :: AssociatedTyLastVarInKind -> AssociatedTyLastVarInKind -> Bool

associatedTyLastVarInKind :: Maybe TyCon -> AssociatedTyLastVarInKind

data AssociatedTyNotParamOverLastTyVar

If NoAssociatedTyNotParamOverLastTyVar, the associated type of a typeclass is not parameterized over the last type variable of the class

Constructors

YesAssociatedTyNotParamOverLastTyVar !TyCon

The associated type family of the class

NoAssociatedTyNotParamOverLastTyVar

Instances

Eq AssociatedTyNotParamOverLastTyVar

Defined in GHC.Tc.Errors.Types

Methods

(==) :: AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool

(/=) :: AssociatedTyNotParamOverLastTyVar -> AssociatedTyNotParamOverLastTyVar -> Bool

associatedTyNotParamOverLastTyVar :: Maybe TyCon -> AssociatedTyNotParamOverLastTyVar

data MissingSignature

What kind of thing is missing a type signature?

Used for reporting "missing signature" warnings, see tcRnMissingSignature.

Constructors

MissingTopLevelBindingSig Name Type

MissingPatSynSig PatSyn

MissingTyConKindSig TyCon Bool

whether -XCUSKs is enabled

data Exported

Is the object we are dealing with exported or not?

Used for reporting "missing signature" warnings, see TcRnMissingSignature.

Constructors

IsNotExported

IsExported

Instances

Outputable Exported

Defined in GHC.Tc.Errors.Types

Methods

ppr :: Exported -> SDoc

data HsDocContext

Constructors

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)

ConDeclCtx [LocatedN Name]

ClassDeclCtx (LocatedN RdrName)

ExprWithTySigCtx

TypBrCtx

HsTypeCtx

HsTypePatCtx

GHCiCtx

SpliceTypeCtx (LHsType GhcPs)

ClassInstanceCtx

GenericCtx SDoc

data FixedRuntimeRepErrorInfo

Stores the information to be reported in a representation-polymorphism error message.

Constructors

FRR_Info

Fields

• frr_info_origin :: FixedRuntimeRepOrigin

  What is the original type we checked for representation-polymorphism, and what specific check did we perform?

• frr_info_not_concrete :: Maybe (TcTyVar, TcType)

  Which non-concrete type did we try to unify this concrete type variable with?

data ErrorItem

A predicate with its arising location; used to encapsulate a constraint that will give rise to a diagnostic.

Constructors

EI

Fields

• ei_pred :: PredType
• ei_evdest :: Maybe TcEvDest
• ei_flavour :: CtFlavour
• ei_loc :: CtLoc
• ei_m_reason :: Maybe CtIrredReason
• ei_suppress :: Bool

Instances

Outputable ErrorItem

Defined in GHC.Tc.Errors.Types

Methods

ppr :: ErrorItem -> SDoc

errorItemOrigin :: ErrorItem -> CtOrigin

errorItemEqRel :: ErrorItem -> EqRel

errorItemPred :: ErrorItem -> PredType

errorItemCtLoc :: ErrorItem -> CtLoc

data SolverReport

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 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.

Constructors

SolverReport

Fields

• sr_important_msg :: SolverReportWithCtxt
• sr_supplementary :: [SolverReportSupplementary]
• sr_hints :: [GhcHint]

data SolverReportSupplementary

Additional information to print in a SolverReport, after the important messages and after the error context.

See Note [Error report].

Constructors

SupplementaryBindings RelevantBindings

SupplementaryHoleFits ValidHoleFits

SupplementaryCts [(PredType, RealSrcSpan)]

data SolverReportWithCtxt

A TcSolverReportMsg, together with context (e.g. enclosing implication constraints) that are needed in order to report it.

Constructors

SolverReportWithCtxt

Fields

• reportContext :: SolverReportErrCtxt

  Context for what we wish to report. This can change as we enter implications, so is stored alongside the content.

• reportContent :: TcSolverReportMsg

  The content of the message to report.

Instances

Generic SolverReportWithCtxt

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep SolverReportWithCtxt :: Type -> Type

Methods

from :: SolverReportWithCtxt -> Rep SolverReportWithCtxt x

to :: Rep SolverReportWithCtxt x -> SolverReportWithCtxt

type Rep SolverReportWithCtxt

Defined in GHC.Tc.Errors.Types

type Rep SolverReportWithCtxt = D1 ('MetaData "SolverReportWithCtxt" "GHC.Tc.Errors.Types" "ghc" 'False) (C1 ('MetaCons "SolverReportWithCtxt" 'PrefixI 'True) (S1 ('MetaSel ('Just "reportContext") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SolverReportErrCtxt) :*: S1 ('MetaSel ('Just "reportContent") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TcSolverReportMsg)))

data SolverReportErrCtxt

Context needed when reporting a TcSolverReportMsg, such as the enclosing implication constraints or whether we are deferring type errors.

Constructors

CEC

Fields

• cec_encl :: [Implication]

  Enclosing implications (innermost first) ic_skols and givens are tidied, rest are not

• cec_tidy :: TidyEnv
• cec_binds :: EvBindsVar

  We make some errors (depending on cec_defer) into warnings, and emit evidence bindings into cec_binds for unsolved constraints

• cec_defer_type_errors :: DiagnosticReason

  Whether to defer type errors until runtime

• cec_expr_holes :: DiagnosticReason

  Reason for reporting holes in expressions.

• cec_type_holes :: DiagnosticReason

  Reason for reporting holes in types.

• cec_out_of_scope_holes :: DiagnosticReason

  Reason for reporting out of scope holes.

• cec_warn_redundant :: Bool

  True = -Wredundant-constraints

• cec_expand_syns :: Bool

  True = -fprint-expanded-synonyms

• 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]

Instances

Outputable SolverReportErrCtxt

Defined in GHC.Tc.Errors.Ppr

Methods

ppr :: SolverReportErrCtxt -> SDoc

getUserGivens :: SolverReportErrCtxt -> [UserGiven]

discardProvCtxtGivens :: CtOrigin -> [UserGiven] -> [UserGiven]

data TcSolverReportMsg

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.

Constructors

BadTelescope TyVarBndrs [TyCoVar]

Quantified variables appear out of dependency order.

Example:

forall (a :: k) k. ...

Test cases: BadTelescope2, T16418, T16247, T16726, T18451.

UserTypeError Type

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.

ReportHoleError Hole HoleError

We want to report an out of scope variable or a typed hole. See HoleError.

UntouchableVariable

Trying to unify an untouchable variable, e.g. a variable from an outer scope.

Test case: Simple14

Fields

• untouchableTyVar :: TyVar
• untouchableTyVarImplication :: Implication

CannotUnifyVariable

Cannot unify a variable, because of a type mismatch.

Fields

• mismatchMsg :: MismatchMsg
• cannotUnifyReason :: CannotUnifyVariableReason

Mismatch

A mismatch between two types.

Fields

• mismatchMsg :: MismatchMsg
• mismatchTyVarInfo :: Maybe TyVarInfo
• mismatchAmbiguityInfo :: [AmbiguityInfo]
• mismatchCoercibleInfo :: Maybe CoercibleMsg

FixedRuntimeRepError [FixedRuntimeRepErrorInfo]

A violation of the representation-polymorphism invariants.

See FixedRuntimeRepErrorInfo and FixedRuntimeRepContext for more information.

BlockedEquality ErrorItem

An equality between two types is blocked on a kind equality between their kinds.

Test cases: none.

ExpectingMoreArguments Int TypedThing

Something was not applied to sufficiently many arguments.

Example:

instance Eq Maybe where {..}

Test case: T11563.

UnboundImplicitParams (NonEmpty ErrorItem)

Trying to use an unbound implicit parameter.

Example:

foo :: Int foo = ?param

Test case: tcfail130.

AmbiguityPreventsSolvingCt

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.

Fields

• ErrorItem

  always a class constraint

• ([TyVar], [TyVar])

  ambiguous kind and type variables, respectively

CannotResolveInstance

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.

Fields

• cannotResolve_item :: ErrorItem
• cannotResolve_unifiers :: [ClsInst]
• cannotResolve_candidates :: [ClsInst]
• cannotResolve_importErrors :: [ImportError]
• cannotResolve_suggestions :: [GhcHint]
• cannotResolve_relevant_bindings :: RelevantBindings

OverlappingInstances

Could not solve a constraint using available instances because the instances overlap.

Test cases: tcfail118, tcfail121, tcfail218.

Fields

• overlappingInstances_item :: ErrorItem
• overlappingInstances_matches :: NonEmpty ClsInst
• overlappingInstances_unifiers :: [ClsInst]

UnsafeOverlap

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}.

Fields

• unsafeOverlap_item :: ErrorItem
• unsafeOverlap_match :: ClsInst
• unsafeOverlapped :: NonEmpty ClsInst

Instances

Generic TcSolverReportMsg

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep TcSolverReportMsg :: Type -> Type

Methods

from :: TcSolverReportMsg -> Rep TcSolverReportMsg x

to :: Rep TcSolverReportMsg x -> TcSolverReportMsg

type Rep TcSolverReportMsg

Defined in GHC.Tc.Errors.Types

type Rep TcSolverReportMsg = D1 ('MetaData "TcSolverReportMsg" "GHC.Tc.Errors.Types" "ghc" 'False) (((C1 ('MetaCons "BadTelescope" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyVarBndrs) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [TyCoVar])) :+: (C1 ('MetaCons "UserTypeError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type)) :+: C1 ('MetaCons "ReportHoleError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Hole) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 HoleError)))) :+: ((C1 ('MetaCons "UntouchableVariable" 'PrefixI 'True) (S1 ('MetaSel ('Just "untouchableTyVar") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyVar) :*: S1 ('MetaSel ('Just "untouchableTyVarImplication") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Implication)) :+: C1 ('MetaCons "CannotUnifyVariable" 'PrefixI 'True) (S1 ('MetaSel ('Just "mismatchMsg") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 MismatchMsg) :*: S1 ('MetaSel ('Just "cannotUnifyReason") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 CannotUnifyVariableReason))) :+: (C1 ('MetaCons "Mismatch" 'PrefixI 'True) ((S1 ('MetaSel ('Just "mismatchMsg") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 MismatchMsg) :*: S1 ('MetaSel ('Just "mismatchTyVarInfo") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe TyVarInfo))) :*: (S1 ('MetaSel ('Just "mismatchAmbiguityInfo") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [AmbiguityInfo]) :*: S1 ('MetaSel ('Just "mismatchCoercibleInfo") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe CoercibleMsg)))) :+: C1 ('MetaCons "FixedRuntimeRepError" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [FixedRuntimeRepErrorInfo]))))) :+: ((C1 ('MetaCons "BlockedEquality" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem)) :+: (C1 ('MetaCons "ExpectingMoreArguments" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Int) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TypedThing)) :+: C1 ('MetaCons "UnboundImplicitParams" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (NonEmpty ErrorItem))))) :+: ((C1 ('MetaCons "AmbiguityPreventsSolvingCt" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ([TyVar], [TyVar]))) :+: C1 ('MetaCons "CannotResolveInstance" 'PrefixI 'True) ((S1 ('MetaSel ('Just "cannotResolve_item") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: (S1 ('MetaSel ('Just "cannotResolve_unifiers") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [ClsInst]) :*: S1 ('MetaSel ('Just "cannotResolve_candidates") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [ClsInst]))) :*: (S1 ('MetaSel ('Just "cannotResolve_importErrors") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [ImportError]) :*: (S1 ('MetaSel ('Just "cannotResolve_suggestions") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [GhcHint]) :*: S1 ('MetaSel ('Just "cannotResolve_relevant_bindings") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 RelevantBindings))))) :+: (C1 ('MetaCons "OverlappingInstances" 'PrefixI 'True) (S1 ('MetaSel ('Just "overlappingInstances_item") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: (S1 ('MetaSel ('Just "overlappingInstances_matches") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (NonEmpty ClsInst)) :*: S1 ('MetaSel ('Just "overlappingInstances_unifiers") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [ClsInst]))) :+: C1 ('MetaCons "UnsafeOverlap" 'PrefixI 'True) (S1 ('MetaSel ('Just "unsafeOverlap_item") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: (S1 ('MetaSel ('Just "unsafeOverlap_match") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ClsInst) :*: S1 ('MetaSel ('Just "unsafeOverlapped") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (NonEmpty ClsInst))))))))

data CannotUnifyVariableReason

Constructors

CannotUnifyWithPolytype ErrorItem TyVar Type (Maybe TyVarInfo)

A type equality between a type variable and a polytype.

Test cases: T12427a, T2846b, T10194, ...

OccursCheck

An occurs check.

Fields

• occursCheckInterestingTyVars :: [TyVar]
• occursCheckAmbiguityInfos :: [AmbiguityInfo]

SkolemEscape ErrorItem Implication [TyVar]

A skolem type variable escapes its scope.

Example:

data Ex where { MkEx :: a -> MkEx } foo (MkEx x) = x

Test cases: TypeSkolEscape, T11142.

DifferentTyVars TyVarInfo

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.

RepresentationalEq TyVarInfo (Maybe CoercibleMsg)

Instances

Generic CannotUnifyVariableReason

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep CannotUnifyVariableReason :: Type -> Type

Methods

from :: CannotUnifyVariableReason -> Rep CannotUnifyVariableReason x

to :: Rep CannotUnifyVariableReason x -> CannotUnifyVariableReason

type Rep CannotUnifyVariableReason

Defined in GHC.Tc.Errors.Types

type Rep CannotUnifyVariableReason = D1 ('MetaData "CannotUnifyVariableReason" "GHC.Tc.Errors.Types" "ghc" 'False) ((C1 ('MetaCons "CannotUnifyWithPolytype" 'PrefixI 'False) ((S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyVar)) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe TyVarInfo)))) :+: C1 ('MetaCons "OccursCheck" 'PrefixI 'True) (S1 ('MetaSel ('Just "occursCheckInterestingTyVars") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [TyVar]) :*: S1 ('MetaSel ('Just "occursCheckAmbiguityInfos") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [AmbiguityInfo]))) :+: (C1 ('MetaCons "SkolemEscape" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Implication) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [TyVar]))) :+: (C1 ('MetaCons "DifferentTyVars" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyVarInfo)) :+: C1 ('MetaCons "RepresentationalEq" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TyVarInfo) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe CoercibleMsg))))))

data MismatchMsg

Constructors

BasicMismatch

Couldn't unify two types or kinds.

Example:

3 + 3# -- can't match a lifted type with an unlifted type

Test cases: T1396, T8263, ...

Fields

• mismatch_ea :: MismatchEA

  Should this be phrased in terms of expected vs actual?

• mismatch_item :: ErrorItem

  The constraint in which the mismatch originated.

• mismatch_ty1 :: Type

  First type (the expected type if if mismatch_ea is True)

• mismatch_ty2 :: Type

  Second type (the actual type if mismatch_ea is True)

• mismatch_whenMatching :: Maybe WhenMatching
• mismatch_mb_same_occ :: Maybe SameOccInfo

KindMismatch

A type has an unexpected kind.

Test cases: T2994, T7609, ...

Fields

• kmismatch_what :: TypedThing

  What thing is kmismatch_actual the kind of?

• kmismatch_expected :: Type
• kmismatch_actual :: Type

TypeEqMismatch

A mismatch between two types, which arose from a type equality.

Test cases: T1470, tcfail212.

Fields

• teq_mismatch_ppr_explicit_kinds :: Bool
• teq_mismatch_item :: ErrorItem
• teq_mismatch_ty1 :: Type
• teq_mismatch_ty2 :: Type
• teq_mismatch_expected :: Type

  The overall expected type

• teq_mismatch_actual :: Type

  The overall actual type

• teq_mismatch_what :: Maybe TypedThing

  What thing is teq_mismatch_actual the kind of?

• teq_mb_same_occ :: Maybe SameOccInfo

CouldNotDeduce

Couldn't solve some Wanted constraints using the Givens. Used for messages such as "No instance for ..." and "Could not deduce ... from".

Fields

• cnd_user_givens :: [Implication]
• cnd_wanted :: NonEmpty ErrorItem

  The Wanted constraints we couldn't solve.

  N.B.: the ErrorItem at the head of the list has been tidied, perhaps not the others.

• cnd_extra :: Maybe CND_Extra

  Some additional info consumed by mk_supplementary_ea_msg.

Instances

Generic MismatchMsg

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep MismatchMsg :: Type -> Type

Methods

from :: MismatchMsg -> Rep MismatchMsg x

to :: Rep MismatchMsg x -> MismatchMsg

type Rep MismatchMsg

Defined in GHC.Tc.Errors.Types

type Rep MismatchMsg = D1 ('MetaData "MismatchMsg" "GHC.Tc.Errors.Types" "ghc" 'False) ((C1 ('MetaCons "BasicMismatch" 'PrefixI 'True) ((S1 ('MetaSel ('Just "mismatch_ea") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 MismatchEA) :*: (S1 ('MetaSel ('Just "mismatch_item") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem) :*: S1 ('MetaSel ('Just "mismatch_ty1") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type))) :*: (S1 ('MetaSel ('Just "mismatch_ty2") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type) :*: (S1 ('MetaSel ('Just "mismatch_whenMatching") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe WhenMatching)) :*: S1 ('MetaSel ('Just "mismatch_mb_same_occ") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe SameOccInfo))))) :+: C1 ('MetaCons "KindMismatch" 'PrefixI 'True) (S1 ('MetaSel ('Just "kmismatch_what") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TypedThing) :*: (S1 ('MetaSel ('Just "kmismatch_expected") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type) :*: S1 ('MetaSel ('Just "kmismatch_actual") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type)))) :+: (C1 ('MetaCons "TypeEqMismatch" 'PrefixI 'True) (((S1 ('MetaSel ('Just "teq_mismatch_ppr_explicit_kinds") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Bool) :*: S1 ('MetaSel ('Just "teq_mismatch_item") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 ErrorItem)) :*: (S1 ('MetaSel ('Just "teq_mismatch_ty1") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type) :*: S1 ('MetaSel ('Just "teq_mismatch_ty2") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type))) :*: ((S1 ('MetaSel ('Just "teq_mismatch_expected") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type) :*: S1 ('MetaSel ('Just "teq_mismatch_actual") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Type)) :*: (S1 ('MetaSel ('Just "teq_mismatch_what") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe TypedThing)) :*: S1 ('MetaSel ('Just "teq_mb_same_occ") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe SameOccInfo))))) :+: C1 ('MetaCons "CouldNotDeduce" 'PrefixI 'True) (S1 ('MetaSel ('Just "cnd_user_givens") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [Implication]) :*: (S1 ('MetaSel ('Just "cnd_wanted") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (NonEmpty ErrorItem)) :*: S1 ('MetaSel ('Just "cnd_extra") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe CND_Extra))))))

data MismatchEA

Whether to use expected/actual in a type mismatch message.

Constructors

NoEA

Don't use expected/actual.

EA

Use expected/actual.

Fields

• mismatch_mbEA :: Maybe ExpectedActualInfo

  Whether to also mention type synonym expansion.

mkPlainMismatchMsg :: MismatchMsg -> TcSolverReportMsg

Report a mismatch error without any extra information.

mkBasicMismatchMsg :: MismatchEA -> ErrorItem -> Type -> Type -> MismatchMsg

Construct a basic mismatch message between two types.

See pprMismatchMsg for how such a message is displayed to users.

data WhenMatching

Explain how a kind equality originated.

Constructors

WhenMatching TcType TcType CtOrigin (Maybe TypeOrKind)

Instances

Generic WhenMatching

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep WhenMatching :: Type -> Type

Methods

from :: WhenMatching -> Rep WhenMatching x

to :: Rep WhenMatching x -> WhenMatching

type Rep WhenMatching

Defined in GHC.Tc.Errors.Types

type Rep WhenMatching = D1 ('MetaData "WhenMatching" "GHC.Tc.Errors.Types" "ghc" 'False) (C1 ('MetaCons "WhenMatching" 'PrefixI 'False) ((S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TcType) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TcType)) :*: (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 CtOrigin) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 (Maybe TypeOrKind)))))

data ExpectedActualInfo

Expected/actual information.

Constructors

ExpectedActual

Display the expected and actual types.

Fields

• ea_expected, ea_actual :: Type

ExpectedActualAfterTySynExpansion

Display the expected and actual types, after expanding type synonyms.

Fields

• ea_expanded_expected, ea_expanded_actual :: Type

data TyVarInfo

A cue to print out information about type variables, e.g. where they were bound, when there is a mismatch tv1 ~ ty2.

Constructors

TyVarInfo

Fields

• thisTyVar :: TyVar
• thisTyVarIsUntouchable :: Maybe Implication
• otherTy :: Maybe TyVar

data SameOccInfo

Add some information to disambiguate errors in which two Names would otherwise appear to be identical.

See Note [Disambiguating (X ~ X) errors].

Constructors

SameOcc

Fields

• sameOcc_same_pkg :: Bool

  Whether the two Names also came from the same package.

• sameOcc_lhs :: Name
• sameOcc_rhs :: Name

data AmbiguityInfo

Add some information about ambiguity

Constructors

Ambiguity

Some type variables remained ambiguous: print them to the user.

Fields

• 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."

• ambig_tyvars :: ([TyVar], [TyVar])

  Ambiguous kind and type variables, respectively. Guaranteed to not both be empty.

NonInjectiveTyFam TyCon

Remind the user that a particular type family is not injective.

data CND_Extra

Additional information to be given in a CouldNotDeduce message, which is then passed on to mk_supplementary_ea_msg.

Constructors

CND_Extra TypeOrKind Type Type

data FitsMbSuppressed

A collection of valid hole fits or refinement fits, in which some fits might have been suppressed.

Constructors

Fits

Fields

• fits :: [HoleFit]
• fitsSuppressed :: Bool

  Whether we have suppressed any fits because there were too many.

data ValidHoleFits

A collection of hole fits and refinement fits.

Constructors

ValidHoleFits

Fields

• holeFits :: FitsMbSuppressed
• refinementFits :: FitsMbSuppressed

noValidHoleFits :: ValidHoleFits

data HoleFitDispConfig

Configuration for pretty-printing valid hole fits.

Constructors

HFDC

Fields

• showWrap, showWrapVars, showType, showProv, showMatches :: Bool

data RelevantBindings

Constructors

RelevantBindings

Fields

• relevantBindingNamesAndTys :: [(Name, Type)]
• ranOutOfFuel :: Bool

  Whether we ran out of fuel generating the bindings.

pprRelevantBindings :: RelevantBindings -> SDoc

Display some relevant bindings.

data PromotionErr

Constructors

TyConPE

ClassPE

FamDataConPE

ConstrainedDataConPE PredType

PatSynPE

RecDataConPE

TermVariablePE

NoDataKindsDC

Instances

Outputable PromotionErr

Defined in GHC.Tc.Errors.Types

Methods

ppr :: PromotionErr -> SDoc

pprPECategory :: PromotionErr -> SDoc

peCategory :: PromotionErr -> String

data NotInScopeError

Some form of "not in scope" error. See also the OutOfScopeHole constructor of HoleError.

Constructors

NotInScope

A run-of-the-mill "not in scope" error.

NoExactName Name

An exact Name was not in scope.

This usually indicates a problem with a Template Haskell splice.

Test cases: T5971, T18263.

SameName [GlobalRdrElt]

always at least 2 elements

MissingBinding SDoc [GhcHint]

NoTopLevelBinding

Couldn't find a top-level binding.

Happens when specifying an annotation for something that is not in scope.

Test cases: annfail01, annfail02, annfail11.

UnknownSubordinate SDoc

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.

Instances

Generic NotInScopeError

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep NotInScopeError :: Type -> Type

Methods

from :: NotInScopeError -> Rep NotInScopeError x

to :: Rep NotInScopeError x -> NotInScopeError

type Rep NotInScopeError

Defined in GHC.Tc.Errors.Types

type Rep NotInScopeError = D1 ('MetaData "NotInScopeError" "GHC.Tc.Errors.Types" "ghc" 'False) ((C1 ('MetaCons "NotInScope" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "NoExactName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 Name)) :+: C1 ('MetaCons "SameName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [GlobalRdrElt])))) :+: (C1 ('MetaCons "MissingBinding" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SDoc) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 [GhcHint])) :+: (C1 ('MetaCons "NoTopLevelBinding" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "UnknownSubordinate" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 SDoc)))))

mkTcRnNotInScope :: RdrName -> NotInScopeError -> TcRnMessage

Create a "not in scope" error message for the given RdrName.

data ImportError

Explain a problem with an import.

Constructors

MissingModule ModuleName

Couldn't find a module with the requested name.

ModulesDoNotExport (NonEmpty Module) OccName

The imported modules don't export what we're looking for.

Instances

Outputable ImportError

Defined in GHC.Tc.Errors.Ppr

Methods

ppr :: ImportError -> SDoc

data HoleError

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.

Constructors

OutOfScopeHole [ImportError]

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.

HoleError HoleSort [TcTyVar] [(SkolemInfoAnon, [TcTyVar])]

Report a typed hole, or wildcard, with additional information.

data CoercibleMsg

A message that aims to explain why two types couldn't be seen to be representationally equal.

Constructors

UnknownRoles Type

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.

TyConIsAbstract TyCon

The fact that a TyCon is abstract prevents us from decomposing a TyConApp and deducing that two types are representationally equal.

Test cases: none.

OutOfScopeNewtypeConstructor TyCon DataCon

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.

data PotentialInstances

This datatype collates instances that match or unifier, in order to report an error message for an unsolved typeclass constraint.

Constructors

PotentialInstances

Fields

• matches :: [ClsInst]
• unifiers :: [ClsInst]

data UnsupportedCallConvention

Specifies which calling convention is unsupported on the current platform

Constructors

StdCallConvUnsupported

PrimCallConvUnsupported

JavaScriptCallConvUnsupported

Instances

Eq UnsupportedCallConvention

Defined in GHC.Tc.Errors.Types

Methods

(==) :: UnsupportedCallConvention -> UnsupportedCallConvention -> Bool

(/=) :: UnsupportedCallConvention -> UnsupportedCallConvention -> Bool

type ExpectedBackends = [Backend]

Specifies which back ends can handle a requested foreign import or export

data ArgOrResult

Whether the error pertains to a function argument or a result.

Constructors

Arg

Result

data MatchArgsContext

Context for a mismatch in the number of arguments

Constructors

EquationArgs !Name

Name of the function

PatternArgs !(HsMatchContext GhcTc)

Pattern match specifics

data MatchArgBadMatches where

The information necessary to report mismatched numbers of arguments in a match group.

Constructors

MatchArgMatches

Fields

• :: { matchArgFirstMatch :: LocatedA (Match GhcRn body)
•    , matchArgBadMatches :: NonEmpty (LocatedA (Match GhcRn body))
•    } -> MatchArgBadMatches

data ConversionFailReason

The reason a TH splice could not be converted to a Haskell expression

Constructors

IllegalOccName !NameSpace !String

SumAltArityExceeded !SumAlt !SumArity

IllegalSumAlt !SumAlt

IllegalSumArity !SumArity

MalformedType !TypeOrKind !Type

IllegalLastStatement !HsDoFlavour !(LStmt GhcPs (LHsExpr GhcPs))

KindSigsOnlyAllowedOnGADTs

IllegalDeclaration !THDeclDescriptor !IllegalDecls

CannotMixGADTConsWith98Cons

EmptyStmtListInDoBlock

NonVarInInfixExpr

MultiWayIfWithoutAlts

CasesExprWithoutAlts

ImplicitParamsWithOtherBinds

InvalidCCallImpent !String

Source

RecGadtNoCons

GadtNoCons

InvalidTypeInstanceHeader !Type

InvalidTyFamInstLHS !Type

InvalidImplicitParamBinding

DefaultDataInstDecl ![LDataFamInstDecl GhcPs]

FunBindLacksEquations !Name

Instances

Generic ConversionFailReason

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep ConversionFailReason :: Type -> Type

Methods

from :: ConversionFailReason -> Rep ConversionFailReason x

to :: Rep ConversionFailReason x -> ConversionFailReason

type Rep ConversionFailReason

Defined in GHC.Tc.Errors.Types

type Rep ConversionFailReason = D1 ('MetaData "ConversionFailReason" "GHC.Tc.Errors.Types" "ghc" 'False) ((((C1 ('MetaCons "IllegalOccName" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 NameSpace) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 String)) :+: C1 ('MetaCons "SumAltArityExceeded" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SumAlt) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SumArity))) :+: (C1 ('MetaCons "IllegalSumAlt" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SumAlt)) :+: (C1 ('MetaCons "IllegalSumArity" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 SumArity)) :+: C1 ('MetaCons "MalformedType" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 TypeOrKind) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type))))) :+: ((C1 ('MetaCons "IllegalLastStatement" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 HsDoFlavour) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 (LStmt GhcPs (LHsExpr GhcPs)))) :+: (C1 ('MetaCons "KindSigsOnlyAllowedOnGADTs" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "IllegalDeclaration" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 THDeclDescriptor) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 IllegalDecls)))) :+: (C1 ('MetaCons "CannotMixGADTConsWith98Cons" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "EmptyStmtListInDoBlock" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "NonVarInInfixExpr" 'PrefixI 'False) (U1 :: Type -> Type))))) :+: (((C1 ('MetaCons "MultiWayIfWithoutAlts" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "CasesExprWithoutAlts" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "ImplicitParamsWithOtherBinds" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "InvalidCCallImpent" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 String)) :+: C1 ('MetaCons "RecGadtNoCons" 'PrefixI 'False) (U1 :: Type -> Type)))) :+: ((C1 ('MetaCons "GadtNoCons" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "InvalidTypeInstanceHeader" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type)) :+: C1 ('MetaCons "InvalidTyFamInstLHS" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Type)))) :+: (C1 ('MetaCons "InvalidImplicitParamBinding" 'PrefixI 'False) (U1 :: Type -> Type) :+: (C1 ('MetaCons "DefaultDataInstDecl" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 [LDataFamInstDecl GhcPs])) :+: C1 ('MetaCons "FunBindLacksEquations" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 Name)))))))

data UnrepresentableTypeDescr

Constructors

LinearInvisibleArgument

CoercionsInTypes

data LookupTHInstNameErrReason

Constructors

NoMatchesFound

CouldNotDetermineInstance

data SplicePhase

The phase in which an exception was encountered when dealing with a TH splice

Constructors

SplicePhase_Run

SplicePhase_CompileAndLink

data THDeclDescriptor

Label for a TH declaration

Constructors

InstanceDecl

WhereClause

LetBinding

LetExpression

ClssDecl

data RunSpliceFailReason

Constructors

ConversionFail !ThingBeingConverted !ConversionFailReason

Instances

Generic RunSpliceFailReason

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep RunSpliceFailReason :: Type -> Type

Methods

from :: RunSpliceFailReason -> Rep RunSpliceFailReason x

to :: Rep RunSpliceFailReason x -> RunSpliceFailReason

type Rep RunSpliceFailReason

Defined in GHC.Tc.Errors.Types

type Rep RunSpliceFailReason = D1 ('MetaData "RunSpliceFailReason" "GHC.Tc.Errors.Types" "ghc" 'False) (C1 ('MetaCons "ConversionFail" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 ThingBeingConverted) :*: S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'SourceStrict 'DecidedStrict) (Rec0 ConversionFailReason)))

data ThingBeingConverted

Identifies the TH splice attempting to be converted

Constructors

ConvDec !Dec

ConvExp !Exp

ConvPat !Pat

ConvType !Type

data IllegalDecls

Constructors

IllegalDecls !(NonEmpty (LHsDecl GhcPs))

IllegalFamDecls !(NonEmpty (LFamilyDecl GhcPs))

data EmptyStatementGroupErrReason

The context for an "empty statement group" error.

Constructors

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

Instances

Generic EmptyStatementGroupErrReason

Defined in GHC.Tc.Errors.Types

Associated Types

type Rep EmptyStatementGroupErrReason :: Type -> Type

Methods

from :: EmptyStatementGroupErrReason -> Rep EmptyStatementGroupErrReason x

to :: Rep EmptyStatementGroupErrReason x -> EmptyStatementGroupErrReason

type Rep EmptyStatementGroupErrReason

Defined in GHC.Tc.Errors.Types

type Rep EmptyStatementGroupErrReason = D1 ('MetaData "EmptyStatementGroupErrReason" "GHC.Tc.Errors.Types" "ghc" 'False) ((C1 ('MetaCons "EmptyStmtsGroupInParallelComp" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "EmptyStmtsGroupInTransformListComp" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "EmptyStmtsGroupInDoNotation" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 HsDoFlavour)) :+: C1 ('MetaCons "EmptyStmtsGroupInArrowNotation" 'PrefixI 'False) (U1 :: Type -> Type)))

data UnexpectedStatement where

An existential wrapper around StmtLR GhcPs GhcPs body.

Constructors

UnexpectedStatement :: Outputable (StmtLR GhcPs GhcPs body) => StmtLR GhcPs GhcPs body -> UnexpectedStatement