type family panic: Coercion.splitCoercionKindOf

as seen in #2146 (closed)##2432 (closed), confirmed with GHCi, version 6.9.20080709

{-# LANGUAGE TypeFamilies #-}
type family F a :: * -> *

foo3 :: (F Int ~ fi, F Bool ~ fb, fi a ~ fb a) => a
foo3 = undefined

ghc.exe: panic! (the 'impossible' happened)
  (GHC version 6.9.20080709 for i386-unknown-mingw32):
        Coercion.splitCoercionKindOf
    ghc-prim:GHC.Prim.left{(w) tc 34B} $co${tc a7j} [tv]
    <pred>fi{tv a6W} [sk] ~ fb{tv a6X} [sk]

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

Trac metadata

Trac field	Value
Version	6.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown
Architecture	Unknown