Maybe you could look at Helium [http://www.cs.uu.nl/wiki/bin/view/Helium/WebHome].
From what I understand, it's a subset of Haskell specially designed for teaching. I heard that it provides also very good error messages and hints about typical errors.


2013/5/21 Rustom Mody <rustompmody@gmail.com>
We are offering a MOOC on haskell :
https://moocfellowship.org/submissions/the-dance-of-functional-programming-languaging-with-haskell-and-python

Full Announcement on beginners list :
http://www.haskell.org/pipermail/beginners/2013-May/012013.html

One question that I have been grappling with in this regard:
How to run ghc in lightweight/beginner mode?

2 examples of what I mean:

1. gofer used to come with an alternative standard prelude -- 'simple.pre'
    Using this, gofer would show many of the type-class based errors as simple (non-type-class based) errors.
    This was very useful for us teachers to help noobs start off without intimidating them.
2. Racket comes with a couple of levels.  The easier numbers were not completely consistent with scheme semantics, but
    was gentle to beginners

Any thoughts/inputs on this will be welcomed

Rusi

_______________________________________________
Haskell-Cafe mailing list
Haskell-Cafe@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe