ghc(i) crashes on instance declaration

multiple lines, ''no wiki''

{-# LANGUAGE MultiParamTypeClasses, TypeFamilies, ConstraintKinds, UndecidableInstances, FunctionalDependencies, FlexibleInstances #-}


{-
after declaring the instance 

instance TS TST TT m where

below my ghci crashes on arch linux x86_64, if you comment it out no crash happens.

ghc: panic! (the 'impossible' happened)
  (GHC version 7.6.2 for x86_64-unknown-linux):
	getClassPredTys
<<details unavailable>>

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



module Crash where

class T t where
  type TPI t :: *
       
class (T t, C (TPI t) m (TPI t)) => TC c t m | c -> t

class (T t, C (TPI t) m (TPI t)) => TS s t m | s -> t
  
data C i m o

data TST

data TT

instance TS TST TT m where

Trac metadata

Trac field	Value
Version	7.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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Architecture