[m-dev.] for review: make type class error message more accurate

[Tyson Dowd]

On 01-Dec-1998, David Jeffery <dgj at cs.mu.OZ.AU> wrote:
> 
> compiler/check_typeclass.m:
> 	Add an indication of whether or not the type class method for which
> 	we are reporting an error is a predicate or a function.

This fine.  There is a little code duplication, but it isn't a big
concern.

Feel free to check it in.

-- 

Because I dislike being quoted I lie almost constantly when talking 
about my work.
		-- Terry Gilliam

Tyson Dowd   <tyson at tyse.net>   http://tyse.net/