[m-dev.] diff: map__lookup error message

[Tyson Richard DOWD]

> 
> To accomodate this, this change implements a mechanism to override 
> definitions of predicates for particular Prologs. This mechanism makes
> explicit which .no or .ql files contain preds overriding others, and so
> makes things a bit more robust.

> library/Mmakefile:
> 	Set new environment variables, MERCURY_NU_OVERRIDDEN_LIB_OBJS or
> 	MERCURY_SP_OVERRIDDEN_LIB_OBJS to be the files which are to be
> 	linked, but contain definitions which override others.

Can I suggest adding these two explanations to the Mmakefile as well?

-- 
       Tyson Dowd           # 
                            #  Surreal humour isn't eveyone's cup of
     trd at cs.mu.oz.au        #  fur.
http://www.cs.mu.oz.au/~trd #