[Template-haskell] problem with quasi-quoting instance declaration

[Ganesh Sittampalam]

Using 6.0.1 or the 20030903 CVS snapshot:

ghc-6.1: panic! (the `impossible' happened, GHC version 6.1):
        Failed binder lookup: GHCziShow.show {- v r4H -}

If I try to compile the following code. Commenting out the line defining
show (but not the instance line itself) makes the error go away.

Cheers,

Ganesh

module TH2 where

code =
 [d|
   data Foo = Foo

   instance Show Foo where
     show Foo = "foo"
 |]