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Within LTS Haskell 24.51 (ghc-9.10.3)
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splitForAllCo_maybe :: Coercion -> Maybe (TyCoVar, ForAllTyFlag, ForAllTyFlag, Coercion, Coercion)ghc-lib-parser GHC.Core.Coercion No documentation available.
splitForAllCo_ty_maybe :: Coercion -> Maybe (TyVar, ForAllTyFlag, ForAllTyFlag, Coercion, Coercion)ghc-lib-parser GHC.Core.Coercion Like splitForAllCo_maybe, but only returns Just for tyvar binder
splitFunCo_maybe :: Coercion -> Maybe (Coercion, Coercion)ghc-lib-parser GHC.Core.Coercion No documentation available.
topNormaliseNewType_maybe :: Type -> Maybe (Coercion, Type)ghc-lib-parser GHC.Core.Coercion Sometimes we want to look through a newtype and get its associated coercion. This function strips off newtype layers enough to reveal something that isn't a newtype. Specifically, here's the invariant:
topNormaliseNewType_maybe rec_nts ty = Just (co, ty')
then (a) co : ty ~R ty'. (b) ty' is not a newtype. The function returns Nothing for non-newtypes, or unsaturated applications This function does *not* look through type families, because it has no access to the type family environment. If you do have that at hand, consider to use topNormaliseType_maybe, which should be a drop-in replacement for topNormaliseNewType_maybe If topNormliseNewType_maybe ty = Just (co, ty'), then co : ty ~R ty'coAxiomRuleBranch_maybe :: CoAxiomRule -> Maybe (TyCon, Role, CoAxBranch)ghc-lib-parser GHC.Core.Coercion.Axiom No documentation available.
coAxiomSingleBranch_maybe :: forall (br :: BranchFlag) . CoAxiom br -> Maybe CoAxBranchghc-lib-parser GHC.Core.Coercion.Axiom No documentation available.
isNewtypeAxiomRule_maybe :: CoAxiomRule -> Maybe (TyCon, CoAxBranch)ghc-lib-parser GHC.Core.Coercion.Axiom No documentation available.
dataConFieldType_maybe :: DataCon -> FieldLabelString -> Maybe (FieldLabel, Type)ghc-lib-parser GHC.Core.DataCon Extract the label and type for any given labelled field of the DataCon, or return Nothing if the field does not belong to it
dataConWrapId_maybe :: DataCon -> Maybe Idghc-lib-parser GHC.Core.DataCon Get the Id of the DataCon wrapper: a function that wraps the "actual" constructor so it has the type visible in the source program: c.f. dataConWorkId. Returns Nothing if there is no wrapper, which occurs for an algebraic data constructor and also for a newtype (whose constructor is inlined compulsorily)
splitDataProductType_maybe :: Type -> Maybe (TyCon, [Type], DataCon, [Scaled Type])ghc-lib-parser GHC.Core.DataCon Extract the type constructor, type argument, data constructor and it's representation argument types from a type if it is a product type. Precisely, we return Just for any data type that is all of:
- Concrete (i.e. constructors visible)
- Single-constructor
- ... which has no existentials