CVS HEAD ghc fails with "Panic!"

[Peter Simons]

Simon,

I had answered to your e-mail almost two days ago, then I
resent my reply today, but apparently my e-mail doesn't
reach you! I see that it was delivered correctly here on my
machine:

  Oct 21 18:56:51 peti sm-mta[11337]: i9LGunqM011335:
      to=<simonpj at microsoft.com>,<simonmar at microsoft.com>,
      ctladdr=<simons at cryp.to> (1000/100), delay=00:00:02,
      xdelay=00:00:02, mailer=esmtp, pri=61578,
      relay=mailc.microsoft.com. [207.46.121.52], dsn=2.0.0,
      stat=Sent ( <87r7nsj9gv.fsf at peti.cryp.to> Queued mail
      for delivery)

Maybe the Microsoft mail server doesn't like me? Anyway,
here is the URL you needed to check the bug report:

  http://cryp.to/hsemail/hsemail-2004-10-12.tar.gz

Peter