[xmonad] Re: Issue 336 in xmonad: xmonad won't start: Irrefutable pattern failed for pattern (Data.Maybe.Just nbc_)

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Comment #8 on issue 336 by sonomute: xmonad won't start: Irrefutable  
pattern failed for pattern (Data.Maybe.Just nbc_)
http://code.google.com/p/xmonad/issues/detail?id=336

same problem here,trying to install following this
guide...http://www.lanternthree.com/blog/index.php/2010/03/05/minimalist-x-window-managers-xmonad-
on-apple-os-x-snow-leopard-10-6/