bug report

[Simon Marlow]

> I am reporting a bug in the GHCi Haskell interpreter as requested by 
> the program itself. GHC is 5.04.2 running on SunOS 5.8.
> 
> The interpreter encountered a panic condition when trying to load a
> parser produced by Happy the parser generator.

Yes, this is a known bug in 5.04.2 (although I don't think it was
reported on the lists, so you can be forgiven for not having seen it!).
The workaround is to avoid using the 'a' and 'g' flags to Happy, or to
compile the parser using GHC before loading it into GHCi.

The bug was fixed in the HEAD, but was deemed to difficult to fix in the
5.04.x branch too.

Cheers,
	Simon