Black Hole's in Hugs?

[pablocardenal@laplatavive.com]

Hello again, 
Thanks to Alastair Reid for your excellent response for
my previous question !!!

The concrete question now is: The order of constraints 
in a class definition are important?

=======================================================
========= More info can look here =====================
=======================================================

I'm try to look for the infinte loop in my previous
example and i can't find it anywhere, but i discover
that investing the order of the constranints in a
class definition, the infinite loop disappears
and program now works fine, i.e.:

if i replace

>class  (Rule e r, SubResult r) => SubRule e r where ...

by 

>class  (SubResult r, Rule e r) => SubRule e r where ...

the infinite loop error disappears

Then, the order of constraints in a class definition
 are important?


Saludos,

Pablo_pc Cardenal
Student at UNLP, La Plata, Buenos Aires, Argentina.