OK, I changed the line code as suggested. It is successfully compiled.<br>But it still has one warning:<br>stdm.lhs:38:10:<br> Warning: In the use of `catch'<br> (imported from Prelude, but defined in System.IO.Error):<br>
Deprecated: "Please use the new exceptions variant, Control.Exception.catch"<br><br>I don't know the effect but as long as I can use it for my course, I don't mind. Thank you for your help.<br>
<br><div class="gmail_quote">On Tue, Sep 4, 2012 at 1:46 PM, Eugene Perederey <span dir="ltr"><<a href="mailto:eugene.perederey@gmail.com" target="_blank">eugene.perederey@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
What version of ghc are you using?<br>
In recent versions ghc doesn't support pattern matching of expressions<br>
like (n+1).<br>
You can rewrite that factorial function as<br>
factorial n = n * factorial (n-1)<br>
instead.<br>
<br>
best,<br>
Eugene<br>
<div><div class="h5"><br>
On 3 September 2012 22:08, Iwan Awaludin <<a href="mailto:awaludin@gmail.com">awaludin@gmail.com</a>> wrote:<br>
> Dear Sir/Madam<br>
> I Installed Haskell Platform 2012.2.0.0 for Windows and try to load Stdm.lhs<br>
> which is downloaded from<br>
> <a href="http://www.dcs.gla.ac.uk/~jtod/discrete-mathematics/Stdm.lhs" target="_blank">http://www.dcs.gla.ac.uk/~jtod/discrete-mathematics/Stdm.lhs</a><span onmouseout="cancel = false; window.setTimeout(WRCHideContent, 1000); clearTimeout(showTimer);" onmouseover=" var self = this; showTimer = window.setTimeout(function(){WRCShowContent({'rating':{'value':100,'weight':13},'flags':{},'single':false,'ttl':7200,'expireTime':'20120906114225'}, self.className)},600);" class="wrc11" style="padding-right:16px;width:16px;height:16px"></span><br>
> I have this error:<br>
> stdm.lhs:1160:14: Parse error in pattern: n + 1<br>
> Failed, modules loaded: none.<br>
><br>
> Is there anything I should do to make it right?<br>
> Thank you.<br>
><br>
> --<br>
> Iwan Awaludin<br>
><br>
><br>
><br>
><br>
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</blockquote></div><br><br clear="all"><br>-- <br>Iwan Awaludin<br><a href="http://www.schoolofuniverse.com">http://www.schoolofuniverse.com</a><br><br><br>