patch applied (packages/base): Add Control.Monad.forM and forM_

[Simon Marlow]

Thu Aug 24 01:11:18 PDT 2006  Don Stewart <dons at cse.unsw.edu.au>
  * Add Control.Monad.forM and forM_
  
  flip mapM_ is more and more common, I find. Several suggestions have
  been made to add this, as foreach or something similar. This patch 
  does just that:
  
      forM  :: (Monad m) => [a] -> (a -> m b) -> m [b]
      forM_ :: (Monad m) => [a] -> (a -> m b) -> m ()
  
  So we can write:
       
      Prelude Control.Monad> forM_ [1..4] $ \x -> print x
      1
      2
      3
      4
  

    M ./Control/Monad.hs +13