ghc-9.8.3: The GHC API

Safe Haskell	None
Language	Haskell2010

GHC.Core.Predicate

Synopsis

data Pred
- = ClassPred Class [Type]
- | EqPred EqRel Type Type
- | IrredPred PredType
- | ForAllPred [TyVar] [PredType] PredType
classifyPredType :: PredType -> Pred
isPredTy :: HasDebugCallStack => Type -> Bool
isEvVarType :: Type -> Bool
data EqRel
- = NomEq
- | ReprEq
eqRelRole :: EqRel -> Role
isEqPrimPred :: PredType -> Bool
isEqPred :: PredType -> Bool
getEqPredTys :: PredType -> (Type, Type)
getEqPredTys_maybe :: PredType -> Maybe (Role, Type, Type)
getEqPredRole :: PredType -> Role
predTypeEqRel :: PredType -> EqRel
mkPrimEqPred :: Type -> Type -> Type
mkReprPrimEqPred :: Type -> Type -> Type
mkPrimEqPredRole :: Role -> Type -> Type -> PredType
mkNomPrimEqPred :: Kind -> Type -> Type -> Type
mkClassPred :: Class -> [Type] -> PredType
isDictTy :: Type -> Bool
typeDeterminesValue :: Type -> Bool
isClassPred :: PredType -> Bool
isEqualityClass :: Class -> Bool
isCTupleClass :: Class -> Bool
getClassPredTys :: HasDebugCallStack => PredType -> (Class, [Type])
getClassPredTys_maybe :: PredType -> Maybe (Class, [Type])
classMethodTy :: Id -> Type
classMethodInstTy :: Id -> [Type] -> Type
isIPLikePred :: Type -> Bool
mentionsIP :: Type -> Class -> [Type] -> Bool
isIPTyCon :: TyCon -> Bool
isIPClass :: Class -> Bool
isCallStackTy :: Type -> Bool
isCallStackPred :: Class -> [Type] -> Maybe FastString
isCallStackPredTy :: Type -> Bool
isIPPred_maybe :: Class -> [Type] -> Maybe (Type, Type)
type DictId = EvId
isEvVar :: Var -> Bool
isDictId :: Id -> Bool

Documentation

data Pred Source #

A predicate in the solver. The solver tries to prove Wanted predicates from Given ones.

Constructors

ClassPred Class [Type]	A typeclass predicate.
EqPred EqRel Type Type	A type equality predicate.
IrredPred PredType	An irreducible predicate.
ForAllPred [TyVar] [PredType] PredType	A quantified predicate. See Note [Quantified constraints] in GHC.Tc.Solver.Solve

classifyPredType :: PredType -> Pred Source #

isPredTy :: HasDebugCallStack => Type -> Bool Source #

isEvVarType :: Type -> Bool Source #

data EqRel Source #

A choice of equality relation. This is separate from the type Role because Phantom does not define a (non-trivial) equality relation.

Constructors

NomEq
ReprEq

Instances

Instances details

Outputable EqRel Source #
Instance details Defined in GHC.Core.Predicate Methods ppr :: EqRel -> SDoc Source #
Eq EqRel Source #
Instance details Defined in GHC.Core.Predicate Methods (==) :: EqRel -> EqRel -> Bool # (/=) :: EqRel -> EqRel -> Bool #
Ord EqRel Source #
Instance details Defined in GHC.Core.Predicate Methods compare :: EqRel -> EqRel -> Ordering # (<) :: EqRel -> EqRel -> Bool # (<=) :: EqRel -> EqRel -> Bool # (>) :: EqRel -> EqRel -> Bool # (>=) :: EqRel -> EqRel -> Bool # max :: EqRel -> EqRel -> EqRel # min :: EqRel -> EqRel -> EqRel #

eqRelRole :: EqRel -> Role Source #

isEqPrimPred :: PredType -> Bool Source #

isEqPred :: PredType -> Bool Source #

getEqPredTys :: PredType -> (Type, Type) Source #

getEqPredTys_maybe :: PredType -> Maybe (Role, Type, Type) Source #

getEqPredRole :: PredType -> Role Source #

predTypeEqRel :: PredType -> EqRel Source #

Get the equality relation relevant for a pred type.

mkPrimEqPred :: Type -> Type -> Type Source #

Creates a primitive nominal type equality predicate. t1 ~# t2 Invariant: the types are not Coercions

mkReprPrimEqPred :: Type -> Type -> Type Source #

Creates a primitive representational type equality predicate. t1 ~R# t2 Invariant: the types are not Coercions

mkPrimEqPredRole :: Role -> Type -> Type -> PredType Source #

Makes a lifted equality predicate at the given role

mkNomPrimEqPred :: Kind -> Type -> Type -> Type Source #

Creates a primitive nominal type equality predicate with an explicit (but homogeneous) kind: (~#) k k ty1 ty2

mkClassPred :: Class -> [Type] -> PredType Source #

isDictTy :: Type -> Bool Source #

typeDeterminesValue :: Type -> Bool Source #

isClassPred :: PredType -> Bool Source #

isEqualityClass :: Class -> Bool Source #

isCTupleClass :: Class -> Bool Source #

getClassPredTys :: HasDebugCallStack => PredType -> (Class, [Type]) Source #

getClassPredTys_maybe :: PredType -> Maybe (Class, [Type]) Source #

classMethodTy :: Id -> Type Source #

classMethodInstTy :: Id -> [Type] -> Type Source #

isIPLikePred :: Type -> Bool Source #

mentionsIP :: Type -> Class -> [Type] -> Bool Source #

isIPTyCon :: TyCon -> Bool Source #

isIPClass :: Class -> Bool Source #

isCallStackTy :: Type -> Bool Source #

Is a type a CallStack?

isCallStackPred :: Class -> [Type] -> Maybe FastString Source #

Is a PredType a CallStack implicit parameter?

If so, return the name of the parameter.

isCallStackPredTy :: Type -> Bool Source #

isIPPred_maybe :: Class -> [Type] -> Maybe (Type, Type) Source #

Decomposes a predicate if it is an implicit parameter. Does not look in superclasses. See also [Local implicit parameters].

type DictId = EvId Source #

Dictionary Identifier

isEvVar :: Var -> Bool Source #

isDictId :: Id -> Bool Source #