Trying to declare an infix newtype yields ghc panic

The following code:

newtype (f <.> g) a = Compose (f (g a))

makes GHC output the following on the command line:

ghc-6.6: panic! (the 'impossible' happened)
  (GHC version 6.6 for i386-unknown-linux):
        MkIface.addAvail <.>{tv} main:Utils.Compose{d rCo}

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

Trac metadata

Trac field	Value
Version	6.6
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC	benja.fallenstein@gmail.com
Operating system
Architecture