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Add a test case for tricky type synonyms involving visible dependent kinds

    • Closed Issue created by Ryan Scott @RyanGlScott

    This code does not typecheck on GHC 8.6.1:

    {-# LANGUAGE DataKinds #-}
{-# LANGUAGE PolyKinds #-}
module Bug where

import Data.Kind

data A :: Type -> Type
data B a :: A a -> Type
type C a = B a

    However, it //does// typecheck on GHC HEAD, after commit 5e45ad10 (Finish fix for #14880 (closed).). This is very cool, although it does alarm me that there is no test case which checks for this at the moment. Let's add one to ensure that this stays fixed.

    Trac metadata
    Trac field Value
    Version 8.7
    Type Bug
    TypeOfFailure OtherFailure
    Priority normal
    Resolution Unresolved
    Component Compiler (Type checker)
    Test case
    Differential revisions
    BlockedBy
    Related
    Blocking
    CC
    Operating system
    Architecture
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