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setNominalRole_maybe :: Role -> Coercion -> Maybe CoercionNghc-lib-parser GHC.Core.Coercion Converts a coercion to be nominal, if possible. See Note [Role twiddling functions]
splitAppCo_maybe :: Coercion -> Maybe (Coercion, Coercion)ghc-lib-parser GHC.Core.Coercion Attempt to take a coercion application apart.
splitForAllCo_co_maybe :: Coercion -> Maybe (CoVar, ForAllTyFlag, ForAllTyFlag, Coercion, Coercion)ghc-lib-parser GHC.Core.Coercion Like splitForAllCo_maybe, but only returns Just for covar binder
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.