From: Marius Vollmer <marius.vollmer@uni-dortmund.de>
Cc: bug-guile@gnu.org
Subject: Re: Strange undefined binding bug coupled to module system
Date: Wed, 15 Dec 2004 18:29:08 +0100 [thread overview]
Message-ID: <lj8y7zpj17.fsf@troy.dt.e-technik.uni-dortmund.de> (raw)
In-Reply-To: <xy7y8hadr3q.fsf@nada.kth.se> (Mikael Djurfeldt's message of "10 Nov 2004 09:51:21 +0100")
Mikael Djurfeldt <djurfeldt@nada.kth.se> writes:
> Marius Vollmer <marius.vollmer@uni-dortmund.de> writes:
>
>> Mikael Djurfeldt <djurfeldt@nada.kth.se> writes:
>>
>> > 2004-04-22 Dirk Herrmann <dirk@dirk-herrmanns-seiten.de>
>> >
>> > (scm_m_define): Change order to first create binding and
>> > evaluating the expression afterwards.
>> >
>> > While this change works in the R5RS situation without a module system,
>> > the presence of a module system, with the difference between imported
>> > and local bindings, introduces complications.
>>
>> What would happen if you just revert that change?
>
> The change is a bugfix for another bug, so reverting it would swap one
> bug for another.
Ahh, I see. I'd say a good behavior for 'define' then is the following:
- When the defined name has a local binding, use that binding.
- When the defined name has an imported binding, look up the value of
that binding and make a new local binding initialized with that
value.
- When the defined name has no binding, make a new one and initialize
it with #<unspecified>.
Then the expression is evaluated and the new (or old local) binding
from above is set to the resulting value.
Ok?
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next prev parent reply other threads:[~2004-12-15 17:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-20 13:12 Strange undefined binding bug coupled to module system Mikael Djurfeldt
2004-10-24 18:55 ` Mikael Djurfeldt
2004-11-04 14:10 ` Marius Vollmer
2004-11-10 8:51 ` Mikael Djurfeldt
2004-12-15 17:29 ` Marius Vollmer [this message]
2004-12-15 19:16 ` Mikael Djurfeldt
2004-12-22 15:35 ` Marius Vollmer
2004-12-22 20:29 ` Mikael Djurfeldt
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