Compilation crash with "kindFunResult"

The following (invalid) program triggers this error :

$ ghc -Wall test.hs 
[1 of 1] Compiling Xxx              ( test.hs, test.o )

test.hs:11:12:ghc: panic! (the 'impossible' happened)
  (GHC version 7.6.3 for x86_64-unknown-linux):
	kindFunResult ghc-prim:GHC.Prim.*{(w) tc 34d}

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

module Xxx where

import qualified Test.Hspec as H
import qualified Test.Hspec.Core as HC
import Control.Monad.Reader

type PSpecM = ReaderT [Int] HC.SpecM
type PSpec = PSpecM ()

describe :: String -> PSpec -> PSpec
describe = lift . H.describe

Trac metadata

Trac field	Value
Version	7.6.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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