GHC.Core.TyCo.Tidy

Tidying types and coercions for printing in error messages.

Tidying type related things up for printing

tidyType :: TidyEnv -> Type -> Type

Tidy a Type

See Note [Strictness in tidyType and friends]

tidyTypes :: TidyEnv -> [Type] -> [Type]

Tidy a list of Types

See Note [Strictness in tidyType and friends]

tidyOpenType :: TidyEnv -> Type -> (TidyEnv, Type)

tidyOpenTypes :: TidyEnv -> [Type] -> (TidyEnv, [Type])

Grabs the free type variables, tidies them and then uses tidyType to work over the type itself

tidyVarBndr :: TidyEnv -> TyCoVar -> (TidyEnv, TyCoVar)

tidyVarBndrs :: TidyEnv -> [TyCoVar] -> (TidyEnv, [TyCoVar])

This tidies up a type for printing in an error message, or in an interface file.

It doesn't change the uniques at all, just the print names.

tidyFreeTyCoVars :: TidyEnv -> [TyCoVar] -> TidyEnv

Add the free TyVars to the env in tidy form, so that we can tidy the type they are free in

avoidNameClashes :: [TyCoVar] -> TidyEnv -> TidyEnv

tidyOpenTyCoVar :: TidyEnv -> TyCoVar -> (TidyEnv, TyCoVar)

Treat a new TyCoVar as a binder, and give it a fresh tidy name using the environment if one has not already been allocated. See also tidyVarBndr

tidyOpenTyCoVars :: TidyEnv -> [TyCoVar] -> (TidyEnv, [TyCoVar])

tidyTyCoVarOcc :: TidyEnv -> TyCoVar -> TyCoVar

tidyTopType :: Type -> Type

Calls tidyType on a top-level type (i.e. with an empty tidying environment)

tidyCo :: TidyEnv -> Coercion -> Coercion

Tidy a Coercion

See Note [Strictness in tidyType and friends]

tidyCos :: TidyEnv -> [Coercion] -> [Coercion]

tidyForAllTyBinder :: TidyEnv -> VarBndr TyCoVar vis -> (TidyEnv, VarBndr TyCoVar vis)

tidyForAllTyBinders :: TidyEnv -> [VarBndr TyCoVar vis] -> (TidyEnv, [VarBndr TyCoVar vis])