GeneralizedNewtypeDeriving and PolyKinds

The following code

{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}

class C (a :: k)

instance C Int

newtype MyInt = MyInt Int deriving C

fails with this error:

    Cannot derive well-kinded instance of form `C k (MyInt ...)'
      Class `C' expects an argument of kind `k'
    In the newtype declaration for `MyInt'

I believe this should work, and I think I know what's going on. I'm working on it.

Trac metadata

Trac field	Value
Version	7.6.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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Operating system
Architecture