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Re: Items blocking release 1.6.1 (2002-04-21)
From: |
Marius Vollmer |
Subject: |
Re: Items blocking release 1.6.1 (2002-04-21) |
Date: |
23 Apr 2002 20:16:20 +0200 |
User-agent: |
Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 |
Thien-Thi Nguyen <address@hidden> writes:
> Ok, I'll looker closer into this, and I now have to say that we can't
> 'fix' it. We would be changing the default default value from '#f'
> to something else. That would be an unacceptable interface change.
>
> but removing `bound?' is acceptable?
Yes. The way the old 'bound?' was implemented was a bug. The mistake
(my mistake) back then was to fix this bug in a sub-optimal way, by
just removing the functionality. Now it is too late to change it
again; and changing it would be quite gratuitous, too.
Using #f as the default default value is a sensible thing, I'd say,
and should even be recommended. From a robustness standpoint,
distinguishing between explicitely specifying a keyword with its
default value in a function call, and not specifying it, should not be
done. That is, it is better to say "When you don't specify the :foo
keyword, it's value is defaulted to #f. A value of #f means bla."
instead of "When you don't specify the :foo keyword, it means bla."
> Since it is easy for the user to provide the functionality on its
> own, we can just leave it as it is.
>
> to provide out of band info, you can use out of band methods (in fact,
> this is the fix i thought you were going to consider).
Yes, but we would have to change the semantics of (ice-9 optargs) in a
way that could lead to silent failures. Removing 'bound?' did not do
that.
> cc'ing guile-user to see who complains (besides me). maybe someone can
> send a patch to do a clean fix, and explain it. maybe it's time to fork
> guile (again).
I think it would be smarter to just fork (ice-9 optargs), if you can
make such fine distinctions.
- Re: Items blocking release 1.6.1 (2002-04-21), (continued)
Re: Items blocking release 1.6.1 (2002-04-21), Chris Beggy , 2002/04/23
Re: Items blocking release 1.6.1 (2002-04-21), Bill Gribble, 2002/04/22
Re: Items blocking release 1.6.1 (2002-04-21),
Marius Vollmer <=
Re: Items blocking release 1.6.1 (2002-04-21), Marius Vollmer, 2002/04/28
Re: Items blocking release 1.6.1 (2002-04-21), spu, 2002/04/28