Scriptable error messages

[Stefan Holdermans]

Daniel,

> A while ago we were at a presentation of Feldspar, a
> Embedded Domain Specific Language, and one of the negative points of
> using haskell was that the error messages could be cryptic due to the
> various ways it was implemented.

Incidentally, but actually by no means surprisingly, this very same  
issue. amongst others, was once more brought up by Jeremy Siek in his  
invited talk at PEPM 2010, just a few days ago:

   http://ecee.colorado.edu/~siek/pepm-keynote.pdf .

Cheers,

   Stefan