purescript-0.9.3: PureScript Programming Language Compiler

Safe HaskellNone
LanguageHaskell98

Language.PureScript.TypeChecker.Skolems

Description

Functions relating to skolemization used during typechecking

Synopsis

Documentation

newSkolemConstant :: MonadState CheckState m => m Int Source #

Generate a new skolem constant

introduceSkolemScope :: MonadState CheckState m => Type -> m Type Source #

Introduce skolem scope at every occurence of a ForAll

newSkolemScope :: MonadState CheckState m => m SkolemScope Source #

Generate a new skolem scope

skolemize :: String -> Int -> SkolemScope -> Maybe SourceSpan -> Type -> Type Source #

Skolemize a type variable by replacing its instances with fresh skolem constants

skolemizeTypesInValue :: String -> Int -> SkolemScope -> Maybe SourceSpan -> Expr -> Expr Source #

This function has one purpose - to skolemize type variables appearing in a SuperClassDictionary placeholder. These type variables are somewhat unique since they are the only example of scoped type variables.

skolemEscapeCheck :: MonadError MultipleErrors m => Expr -> m () Source #

Ensure skolem variables do not escape their scope