[Haskell-cafe] What is MonadPlus good for?

Benjamin Pierce bcpierce at cis.upenn.edu
Sat Feb 12 13:08:59 EST 2005

I have seen lots of examples that show how it's useful to make some type
constructor into an instance of Monad.

Where can I find examples showing why it's good to take the trouble to show
that something is also a MonadPlus?  (I know there are many examples of
things that *are* MonadPluses; what I want to know is why this is
interesting. :-)


     - Benjamin

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