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

Comment #1 on issue 487 by allber...@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.