From: Stefan Monnier <monnier@IRO.UMontreal.CA>
To: Michael Heerdegen <michael_heerdegen@web.de>
Cc: Mark Oteiza <mvoteiza@udel.edu>,
npostavs@users.sourceforge.net, emacs-devel@gnu.org
Subject: Re: if-let/if-let*/and-let/..
Date: Mon, 12 Feb 2018 12:32:06 -0500 [thread overview]
Message-ID: <jwvy3jyw1wd.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <jwv8tbyyx4x.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Mon, 12 Feb 2018 11:58:43 -0500")
Resending with correct Cc. Sorry 'bout that and thanks Mark for the
heads up,
Stefan
Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>>> This if/when/and-let/let* business looks pretty messy to me:
>>>
>>> - why do we have and-let* ? According to its docstring the only case
>>> when it differs from when-let* is when body is nil, but in that case
>>> you're better off moving the last binding to the body (and use
>>> when-let*).
>>
>> The discussion about this was in bug#28254. The original and-let*
>> version was much more different from `when-let*', but AFAIR Noam vetoed
>> against this version, so they got more similar in the end.
>
> Is it worth keeping this "more similar" result at all?
>
>> The original reason was that we decided that the names without "*" are
>> quite confusing and we wanted to get rid of them in the future.
>
> Is the benefit of slightly reducing confusion (I really find it hard to
> believe the confusion is serious, since the dependencies between the
> different steps would make it rather inconvenient to provide a real
> "parallel-let" semantics) worth the burden of those
> compatibility/obsolescence issues (I'd also mention the confusing
> aspect of having an extra * for a construct that doesn't exist without
> a *, even though traditionally the * is used to mark an "alternative"
> definition, as in list*, mapcar*, ...).
>
> Another question is why aren't when-let and when-let* aliases of
> each other? Currently we have 5 variants (2 of which are deprecated)
> each with very slightly different semantics.
>
>
> Stefan
>
>
> PS: I'm also biased against when-let* because I find this * ugly.
next prev parent reply other threads:[~2018-02-12 17:32 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-11 23:51 if-let/if-let*/and-let/ Stefan Monnier
[not found] ` <87wozijhpk.fsf@web.de>
[not found] ` <jwv8tbyyx4x.fsf-monnier+emacs@gnu.org>
2018-02-12 17:32 ` Stefan Monnier [this message]
2018-02-13 18:23 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-13 19:24 ` if-let/if-let*/and-let/ Stefan Monnier
2018-02-13 20:52 ` if-let/if-let*/and-let/ John Wiegley
2018-02-13 19:31 ` if-let/if-let*/and-let/ Mark Oteiza
2018-02-13 20:49 ` if-let/if-let*/and-let/ Stefan Monnier
2018-02-14 0:07 ` if-let/if-let*/and-let/ Mark Oteiza
2018-02-14 23:07 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-15 3:37 ` if-let/if-let*/and-let/ Stefan Monnier
2018-02-21 4:26 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-22 1:08 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-22 5:10 ` if-let/if-let*/and-let/ Stefan Monnier
2018-02-22 7:55 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-03 14:12 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-06 15:03 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-06 15:31 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-06 15:34 ` if-let/if-let*/and-let/ John Wiegley
2018-03-06 16:03 ` if-let/if-let*/and-let/ Stefan Monnier
2018-03-06 17:40 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-06 19:12 ` if-let/if-let*/and-let/ Radon Rosborough
2018-03-07 2:13 ` if-let/if-let*/and-let/ James Nguyen
2018-03-07 3:42 ` if-let/if-let*/and-let/ Kaushal Modi
2018-03-06 17:40 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-07 14:15 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-07 15:13 ` if-let/if-let*/and-let/ Nicolas Petton
2018-03-07 20:43 ` if-let/if-let*/and-let/ John Wiegley
2018-03-08 13:53 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-09 15:16 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-09 15:32 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-09 16:07 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-09 16:24 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-09 16:33 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-09 18:22 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-09 22:24 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-10 8:02 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-10 15:54 ` if-let/if-let*/and-let/ Stefan Monnier
2018-03-10 16:07 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-10 16:29 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-10 17:16 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-03-10 17:29 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-06 16:04 ` if-let/if-let*/and-let/ Eli Zaretskii
2018-03-06 17:35 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-13 20:54 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-13 21:57 ` if-let/if-let*/and-let/ Eric Abrahamsen
2018-02-13 22:39 ` if-let/if-let*/and-let/ Michael Heerdegen
2018-02-13 22:51 ` if-let/if-let*/and-let/ Eric Abrahamsen
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