ScopedTypeVariables and PolyKinds

The following code panics:

{-# LANGUAGE ScopedTypeVariables        #-}
{-# LANGUAGE PolyKinds                  #-}

module Bug2 where


data TypeRep = TypeRep

data Proxy t = Proxy

typeRep :: Proxy a -> TypeRep
typeRep Proxy = TypeRep

-- This one works fine:
typeOf :: forall a. a -> TypeRep
typeOf _ = typeRep (Proxy :: Proxy a)

-- But this one panics!
typeOf1 :: forall t a. t a -> TypeRep
typeOf1 _ = typeRep (Proxy :: Proxy t)

{-
panic! (the 'impossible' happened)
  (GHC version 7.5.20111216 for x86_64-unknown-linux):
        tyConKind ghc-prim:GHC.Prim.BOX{(w) tc 347}
-}

I believe the problem is an interaction between !ScopedTypeVariables and !PolyKinds.

Trac metadata

Trac field	Value
Version	7.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	jpm@cs.uu.nl
Operating system
Architecture