darcs patch: Improve Control.Monad.filterM:

4 Aug 2006


      Fri Aug  4 13:49:57 CDT 2006  Spencer Janssen 
  * Improve Control.Monad.filterM:
   * filterM is defined in terms of foldr, making it a good consumer in GHC's 
     fusion framework
   * filterM uses linear stack space with respect to the number of items that 
     the predicate returns true, rather than the total number of elements in 
     the input.