[xmonad] Issue 487 in xmonad: XMonad.Util.Run documentation is incorrect

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Comment #1 on issue 487 by allber... at gmail.com: XMonad.Util.Run  
documentation is incorrect
http://code.google.com/p/xmonad/issues/detail?id=487

Actually this is because ghc has become more pedantic of late, and no  
longer allows the postfix section extension by default.  (It used to be lax  
about requiring, or even providing, LANGUAGE pragmas for extensions that  
couldn't break standard-compliant programs.)

You now need {-# LANGUAGE PostfixOperators #-} to enable it, whereas in  
earlier ghc versions it quietly worked by default.