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

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Comment #1 on issue 507 by manpac... 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 can reproduce the same bug with xmonad-0.10-3 from ubuntu 12.0 by running  
shellPrompt and typing any character with code greater than 0x100 (utf-8  
locale), for example "ы".