GNU bug report logs - #31718
26.1; Strange behavior of `cond'

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From: Noam Postavsky <npostavs <at> gmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Robert Cochran <robert-emacs <at> cochranmail.com>, Jay Kamat <jaygkamat <at> gmail.com>, Ikumi Keita <ikumi <at> ikumi.que.jp>, Héctor Enríquez Ramón <hector.e.r <at> gmail.com>, Vibhav Pant <vibhavp <at> gmail.com>, "Basil L. Contovounesios" <contovob <at> tcd.ie>, 31718 <at> debbugs.gnu.org, Pierre Téchoueyres <pierre.techoueyres <at> free.fr>, Andreas Schwab <schwab <at> suse.de>, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#31718: 26.1; Strange behavior of `cond'
Date: Sat, 16 Jun 2018 11:23:33 -0400

Paul Eggert <eggert <at> cs.ucla.edu> writes:

> A small problem: gensym does not guarantee that the resulting symbol
> is unique so the generated symbol could in theory appear in the input

What?

    gensym is a compiled Lisp function in ‘subr.el’.

    (gensym &optional PREFIX)

    Return a new uninterned symbol.
             ^^^

How could a new symbol have already appeared in the input?

(I have no objection to the alternative you used, just wondering why
gensym is not also correct)

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