RHS of associated type not kind-checked

The following code compiles without complaint:

{-# LANGUAGE TypeFamilies, PolyKinds #-}

class Foo a where
  type Bar a

instance Foo Int where
  type Bar Int = Maybe

instance Foo Bool where
  type Bar Bool = Double

We can see here that Bar is ill-kinded. When I try :k Bar in GHCi, I get an assertion failure, not unexpectedly.

I will fix in ongoing work.

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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