GNU bug report logs - #28254
26.0.50; SRFI-2 and-let*

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Message #62 received at 28254 <at> debbugs.gnu.org (full text, mbox):

From: Mark Oteiza <mvoteiza <at> udel.edu>
To: Noam Postavsky <npostavs <at> users.sourceforge.net>
Cc: Michael Heerdegen <michael_heerdegen <at> web.de>, 28254 <at> debbugs.gnu.org
Subject: Re: bug#28254: 26.0.50; SRFI-2 and-let*
Date: Fri, 8 Sep 2017 20:33:55 -0400

On 04/09/17 at 11:55pm, Mark Oteiza wrote:
>On 03/09/17 at 09:13pm, Mark Oteiza wrote:
>>On 02/09/17 at 02:41pm, Noam Postavsky wrote:
>>>On Sat, Sep 2, 2017 at 9:36 AM, Mark Oteiza <mvoteiza <at> udel.edu> wrote:
>>>>This single tuple special case is troublesome IMO:
>>>>
>>>>(if-let* (x) "dogs" "cats") => "cats"
>>>>(if-let* (x (y 2)) "dogs" "cats") => (void-function y)
>>>>(if-let* (x (y 1) (z 2)) "dogs" "cats") => "cats"
>>>>
>>>>I'm curious if this was brought up in the old discussion when this was
>>>>implemented.
>>
>>FWIW, this was brought up in the original thread.
>>https://lists.gnu.org/archive/html/emacs-devel/2014-08/msg00228.html
>>
>>IMO the original suggestion of having if-let and when-let be exclusively
>>single binding, while the starred versions excluding the single binding
>>special case would be more sane.
>>
>>P.S. I just realized I didn't copy the tuple part of if-let* into
>>and-let* in the patch I just sent, and therefore missed the problem this
>>special case causes in tests.
>
>This is a patch implementing the above: if-let and when-let only take
>single tuple, while {if,when,and}-let* lose the single tuple special
>case.

Any comments?

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