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Within LTS Haskell 24.51 (ghc-9.10.3)
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expandUnfolding_maybe :: Unfolding -> Maybe CoreExprghc GHC.Core No documentation available.
getCoVar_maybe :: Coercion -> Maybe CoVarghc GHC.Core.Coercion Extract a covar, if possible. This check is dirty. Be ashamed of yourself. (It's dirty because it cares about the structure of a coercion, which is morally reprehensible.)
instNewTyCon_maybe :: TyCon -> [Type] -> Maybe (Type, Coercion)ghc GHC.Core.Coercion If `instNewTyCon_maybe T ts = Just (rep_ty, co)` then `co :: T ts ~R# rep_ty` Checks for a newtype, and for being saturated
isGReflCo_maybe :: Coercion -> Maybe (Type, Role)ghc GHC.Core.Coercion Returns the type coerced if this coercion is a generalized reflexive coercion. Guaranteed to work very quickly.
isReflCoVar_maybe :: Var -> Maybe Coercionghc GHC.Core.Coercion No documentation available.
isReflCo_maybe :: Coercion -> Maybe (Type, Role)ghc GHC.Core.Coercion Returns the type coerced if this coercion is reflexive. Guaranteed to work very quickly. Sometimes a coercion can be reflexive, but not obviously so. c.f. isReflexiveCo_maybe
isReflexiveCo_maybe :: Coercion -> Maybe (Type, Role)ghc GHC.Core.Coercion Extracts the coerced type from a reflexive coercion. This potentially walks over the entire coercion, so avoid doing this in a loop.
setNominalRole_maybe :: Role -> Coercion -> Maybe CoercionNghc GHC.Core.Coercion Converts a coercion to be nominal, if possible. See Note [Role twiddling functions]
splitAppCo_maybe :: Coercion -> Maybe (Coercion, Coercion)ghc GHC.Core.Coercion Attempt to take a coercion application apart.
splitForAllCo_co_maybe :: Coercion -> Maybe (CoVar, ForAllTyFlag, ForAllTyFlag, Coercion, Coercion)ghc GHC.Core.Coercion Like splitForAllCo_maybe, but only returns Just for covar binder