[Haskell-beginners] Error Loading Stdm.lhs in Haskell platform 2012

[Iwan Awaludin]

Dear Sir/Madam
I Installed *Haskell Platform 2012.2.0.0 for
Windows<http://lambda.haskell.org/platform/download/2012.2.0.0/HaskellPlatform-2012.2.0.0-setup.exe>
*and try to load Stdm.lhs which is downloaded from
http://www.dcs.gla.ac.uk/~jtod/discrete-mathematics/Stdm.lhs
I have this error:
stdm.lhs:1160:14: Parse error in pattern: n + 1
Failed, modules loaded: none.

Is there anything I should do to make it right?
Thank you.

-- 
Iwan Awaludin
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