<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thank you.<br><br>I assumed when I saw this:<br> <br>"we could use <code>Maybe</code>'s
<code>mplus</code> to define a function,
<code>parent s = (mother s) `mplus` (father s)</code>"<br><br>that mplus was *already* present in Maybe.<br><br>Michael<br><br><br>--- On <b>Fri, 5/1/09, Neil Mitchell <i><ndmitchell@gmail.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Neil Mitchell <ndmitchell@gmail.com><br>Subject: Re: [Haskell-cafe] chr/ord?<br>To: "michael rice" <nowgate@yahoo.com><br>Cc: "haskell-cafe@haskell.org" <haskell-cafe@haskell.org>, "Anton van Straaten" <anton@appsolutions.com><br>Date: Friday, May 1, 2009, 6:32 AM<br><br><div class="plainMail">Hi<br><br>> But I get this when I try to use it:<br>><br>> sheep.hs:30:22: Not in scope: `mplus'<br>> [michael@localhost ~]$<br><br>You need to import Control.Monad. You can find answers to these sorts<br>of questions with Hoogle: <a
href="http://haskell.org/hoogle/?hoogle=mplus" target="_blank">http://haskell.org/hoogle/?hoogle=mplus</a><br><br>Thanks<br><br>Neil<br></div></blockquote></td></tr></table><br>