darcs patch: Control.Monad: +void :: f a -> f ()

[gwern0 at gmail.com]

Fri Jan  8 16:44:55 EST 2010  gwern0 at gmail.com
  * Control.Monad: +void :: f a -> f ()
  See http://hackage.haskell.org/trac/ghc/ticket/3292
  Turns m a -> m (). Lets one call functions for their side-effects without
  having to get rid of their return values with '>> return ()'. Very useful
  in many contexts (parsing, IO etc.); particularly good for 'forkIO' and 'forM_',
  as they demand return types of 'IO ()' though most interesting IO functions
  return non-().
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