[m-dev.] context "macros"

[Ralph Becket]

Julien Fischer, Tuesday, 25 March 2008:
> 
> On Tue, 25 Mar 2008, Peter Wang wrote:
> 
> >What do you think of adding support for __file__, __pred__, __line__
> >"macros"?  These would expand into strings or integers like the
> >corresponding C macros.
> 
> I have often though something like this would be useful, particularly
> given that the this_file/0 functions we use in the compiler don't
> extend well when sub-modules are involved (you have to qualify them
> if the parent also defines a this_file/0 function.)
> 
> >My concern was just about the syntax.  __foo__ has the advantages of
> >following C and requiring no changes to the parser.
> 
> >__line__ is a
> >little bit sticky for referential transparency, but __file__ and
> >__pred__ would just act like variables assigned at the start of the
> >predicate.
> 
> An alternative syntax suggestion: @line@, @file@ etc ...

We haven't used the # symbol yet, as I recall.
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