ghc-lib-parser-9.8.2.20240223: The GHC API, decoupled from GHC versions
Safe HaskellNone
LanguageHaskell2010

GHC.Core.TyCo.Compare

Description

Type equality and comparison

Synopsis

Type comparison

eqType :: Type -> Type -> Bool #

Type equality on source types. Does not look through newtypes, PredTypes or type families, but it does look through type synonyms. This first checks that the kinds of the types are equal and then checks whether the types are equal, ignoring casts and coercions. (The kind check is a recursive call, but since all kinds have type Type, there is no need to check the types of kinds.) See also Note [Non-trivial definitional equality] in GHC.Core.TyCo.Rep.

eqTypeX :: RnEnv2 -> Type -> Type -> Bool #

Compare types with respect to a (presumably) non-empty RnEnv2.

eqTypes :: [Type] -> [Type] -> Bool #

Type equality on lists of types, looking through type synonyms but not newtypes.

nonDetCmpTc :: TyCon -> TyCon -> Ordering #

Compare two TyCons. See Note [nonDetCmpType nondeterminism]

pickyEqType :: Type -> Type -> Bool #

Like pickyEqTypeVis, but returns a Bool for convenience

tcEqType :: HasDebugCallStack => Type -> Type -> Bool #

tcEqType implements typechecker equality It behaves just like eqType, but is implemented differently (for now)

tcEqTypeNoKindCheck :: Type -> Type -> Bool #

Just like tcEqType, but will return True for types of different kinds as long as their non-coercion structure is identical.

tcEqTypeVis :: Type -> Type -> Bool #

Like tcEqType, but returns True if the visible part of the types are equal, even if they are really unequal (in the invisible bits)

tcEqTyConApps :: TyCon -> [Type] -> TyCon -> [Type] -> Bool #

Check whether two TyConApps are the same; if the number of arguments are different, just checks the common prefix of arguments.

Visiblity comparision

eqForAllVis :: ForAllTyFlag -> ForAllTyFlag -> Bool #

Do these denote the same level of visibility? Required arguments are visible, others are not. So this function equates Specified and Inferred. Used for printing.

cmpForAllVis :: ForAllTyFlag -> ForAllTyFlag -> Ordering #

Do these denote the same level of visibility? Required arguments are visible, others are not. So this function equates Specified and Inferred. Used for printing.