[xmonad] Issue 507 in xmonad: Pattern match failure in do expression at XMonad/Prompt.hs:601:3-14

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Comment #4 on issue 507 by smp... at gmail.com: Pattern match failure in do  
expression at XMonad/Prompt.hs:601:3-14
http://code.google.com/p/xmonad/issues/detail?id=507

I wanna that fix to be done in some future xmonad releases.