Safe Haskell | None |
---|---|
Language | Haskell98 |
Functions relating to skolemization used during typechecking
- newSkolemConstant :: MonadState CheckState m => m Int
- introduceSkolemScope :: MonadState CheckState m => Type -> m Type
- newSkolemScope :: MonadState CheckState m => m SkolemScope
- skolemize :: String -> Int -> SkolemScope -> Maybe SourceSpan -> Type -> Type
- skolemizeTypesInValue :: String -> Int -> SkolemScope -> Maybe SourceSpan -> Expr -> Expr
- skolemEscapeCheck :: (MonadError MultipleErrors m, MonadState CheckState m) => Expr -> m ()
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, MonadState CheckState m) => Expr -> m () Source
Ensure skolem variables do not escape their scope