kindFunResult panic when type checking wrongly-kinded function

While working on some writing about recursion schemes and morphisms, I wrote the following well-known catamorphism:

import Control.Arrow
newtype Fix f = Fix { unFix :: f (Fix f) }
bottomUp f = unFix >>> fmap (bottomUp f) >>> Fix >>> f

On a lark, I decided to reverse the direction of the arrows in the above statement and see what the typechecker had to say about it:

nonsense f = unFix <<< fmap (nonsense f) <<< Fix <<< f

This function is (I think) not well-kinded, but during type checking (both from ghci and ghc) I get the following error:

ghc: panic! (the 'impossible' happened)
  (GHC version 7.6.3 for i386-apple-darwin):
	kindFunResult
<<details unavailable>>

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

I am running 32-bit GHC 7.6.3 (from the Haskell Platform) on an x86_64 machine running OS X 10.9. I have attached the output of ghc -v.

Trac metadata

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