[Template-haskell] a couple of examples that cause Panic

[Isaac Jones]

Greetings.

Abe Egnor and I ran into a couple of panics in ghc-6.2 with TH in
Debian:

(ghci)

> runQ (reifyDecl show) >>= print

Actually, I think that breaks for any function in place of "show".
Similarly:

> module BugReport where
>
> data ObservedSound = ObservedSound
>
> foo = [d|instance Show ObservedSound  where
>              show _ = "" |]

Ian L. has mentioned that this may be fixed in CVS, but I figured I'd
send it out to you before I forget.

peace,

isaac