id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
4972	ghc-7.0.1.20110217 crash	maeder		"{{{
[386 of 549] Compiling Logic.Comorphism ( Logic/Comorphism.hs, Logic/Comorphism.o )
ghc: panic! (the 'impossible' happened)
  (GHC version 7.0.1.20110217 for x86_64-apple-darwin):
        initC: srt_lbl

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

make: *** [hets] Error 1
}}}

I'll see if this happens under linux, too.
"	bug	closed	normal		Compiler	7.0.1	duplicate			Unknown/Multiple	Unknown/Multiple	Compile-time crash