darcs patch: Control.Monad: add 'ignore' function

[gwern0 at gmail.com]

Thu Jun 11 21:29:53 EDT 2009  gwern0 at gmail.com
  * Control.Monad: add 'ignore' function
  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.).
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