[m-dev.] proposal: extension to pragma obsolete

[Julien Fischer]

On Tue, 9 Sep 2014, Paul Bone wrote:

> On Tue, Sep 09, 2014 at 05:52:20PM +1000, Peter Wang wrote:
>> On Tue, 9 Sep 2014 17:18:16 +1000 (EST), Julien Fischer <jfischer at opturion.com> wrote:
>>>
>>> The main question I have is what should the second argument actually be.  There
>>> are three proposals below: (1) use a string literal, (2) use a list of string
>>> literals or (3) make (some of) the functionality of the error_util library
>>> available so we can mark up the warning messages.
>>>
>>>      (1) :- pragma obsolete(bar.baz/2, "Use predicate `bar.baz_to_int'/2 instead.").
>>>      (2) :- pragma obsolete(bar.baz/2, ["Use predicate",
>>>           "`bar.baz_to_int'/2 instead"]).
>>>      (3) :- pragma obsolete(bar.baz/2, [words("Use predicate"), sym_name_and_arity("bar.baz_to_int", 2),
>>>         words("instead.")]).
>>
>> I think it's unnecessary, as a comment on the predicate declaration is
>> fine.  Otherwise my vote is for (1) literal string.
>>
>
> Oh, I should have said.  I agree with Peter 1 is best as it's the easiest to
> use.

My only issue with (1) is that while it's fine for short messages, it's
going to get a bit messy for longer ones.

Cheers,
Julien.