Thank you. I assumed when I saw this: "we could use Maybe's mplus to define a function, parent s = (mother s) `mplus` (father s)"
that mplus was *already* present in Maybe. Michael --- On Fri, 5/1/09, Neil Mitchell <ndmitch...@gmail.com> wrote: From: Neil Mitchell <ndmitch...@gmail.com> Subject: Re: [Haskell-cafe] chr/ord? To: "michael rice" <nowg...@yahoo.com> Cc: "haskell-cafe@haskell.org" <haskell-cafe@haskell.org>, "Anton van Straaten" <an...@appsolutions.com> Date: Friday, May 1, 2009, 6:32 AM Hi > But I get this when I try to use it: > > sheep.hs:30:22: Not in scope: `mplus' > [mich...@localhost ~]$ You need to import Control.Monad. You can find answers to these sorts of questions with Hoogle: http://haskell.org/hoogle/?hoogle=mplus Thanks Neil
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