Re: [xmonad] Issue 226 in xmonad: XMonad.Prompt lockups with ghc 6.10

Comment #12 on issue 226 by SpencerJanssen: XMonad.Prompt lockups with ghc 6.10

http://code.google.com/p/xmonad/issues/detail?id=226

This seems to be a GHC optimization bug. As a workaround, try this in xmonad-contrib:

...

runghc Setup clean runghc Setup configure --disable-optimization # and any other flags you usually pass

Yes, xmobar and xmonad-contrib work on 64 bit ghc-6.10.1 with --disable-optimization.