Hi guys,
I ran into a repository-corrupting bug while working on a branch of GHC. As it turns out, you can trigger the bug in about 30 seconds with just a few commands. I've attached a (very short) logfile that demonstrates the bug.
I used darcs -v
2.0.1rc2 (2.0.1rc2 (+ -1 patch))
Cheers and happy bug-hunting,
John