cvs commit: fptools/libraries/base/Control/Monad MonadRec.hs

[erkok@glass.cse.ogi.edu]

erkok       2002/09/27 16:10:23 PDT

  Added files:
    libraries/base/Control/Monad MonadRec.hs 
  Log:
  The MonadRec.hs library, stolen from the Hugs release.
  
  Note: There's a clear overlap with the library Control.Monad.Fix.
  
        Unfortunately, the names of the classes are different, mainly
        for historical reasons (MonadFix vs MonadRec.) There was some
        discussion on how to resolve this a while back, but I guess
        Hugs and GHC went their own ways. Once the dust settles, we
        can agree on something common, and make Hugs and GHC use the same
        names. (Note that this duplication also exists in the current
        release of Hugs as well.) For the time being, this file helps
        keep things simple with regard to the already existing code
        that uses the mdo-notation.. (i.e., it also defines instances
        for the LazyST, ST, and list monads in addition
        to the ones defined in Fix.hs: IO and maybe.)
  
  We can also name this file just "Rec", but "MonadRec" sounds less
  confusing, and more inline with the Hugs release.
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