CVS HEAD ghc fails with "Panic!"

[Peter Simons]

Hi,

the GHC version from the current CVS HEAD aborts with an
internal error when doing this:

 $ darcs get http://cryp.to/hsemail
 $ cd hsemail
 $ ghc -O2 --make -o message-test message-test.hs
 | Chasing modules from: message-test.hs
 | Compiling Rfc2234          ( ./Rfc2234.hs, ./Rfc2234.o )
 | ghc-6.3: panic! (the `impossible' happened, GHC version 6.3):
 |         app_match: unbound tpl c{tv a1a9}

Compiling with -O instead of -O2 works, though.

Peter