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

[Stephen Tetley]

The code for the book is written in Haskell '98, but recent versions
of GHC default to Haskell2010.

A salient difference between H98 and H2012 is the removed of n + k
patterns which generates the error you are seeing.

I can't find the exact command to use in the GHC docs to enable H98,
but you could try the following old flag which disables GHCs
extensions:

> ghci 	-fno-glasgow-exts