From: Drew Adams <drew.adams@oracle.com>
To: Gemini Lasswell <gazally@runbox.com>,
Noam Postavsky <npostavs@gmail.com>
Cc: 31688@debbugs.gnu.org
Subject: bug#31688: 26.1.50; Byte compiler confuses two string variables
Date: Sat, 2 Jun 2018 17:40:47 -0700 (PDT) [thread overview]
Message-ID: <197f6fee-36ae-4c55-bf9d-229146343937@default> (raw)
In-Reply-To: <87o9gsztqg.fsf@runbox.com>
> just searched the Elisp reference
> looking for any any warnings not to use destructive functions on
> literals, and didn't find anything.
It's not really about destructive functions.
It's about the fact that you might not have two different
strings, and you should not assume that you do.
It's about `eq'. For the Emacs byte-compiler, apparently,
multiple occurrences of a string literal in the code are
compiled to the same string object. Thinking you have two
separate strings is the problem. Anything you might want
to think or say about the use of "destructive" functions
follows from the fact that you have a single string.
next prev parent reply other threads:[~2018-06-03 0:40 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-02 17:51 bug#31688: 26.1.50; Byte compiler confuses two string variables Gemini Lasswell
2018-06-02 18:02 ` Noam Postavsky
2018-06-02 22:52 ` Gemini Lasswell
2018-06-02 23:25 ` Noam Postavsky
2018-06-03 0:40 ` Drew Adams [this message]
2018-06-02 23:03 ` Drew Adams
2018-06-02 23:38 ` Phil Sainty
2018-06-02 23:54 ` Noam Postavsky
2018-06-03 12:32 ` Phil Sainty
2018-06-03 13:05 ` Andreas Schwab
2018-06-04 10:02 ` Phil Sainty
2018-06-04 15:58 ` Eli Zaretskii
2018-06-04 17:01 ` Andreas Schwab
2018-06-08 15:09 ` Eli Zaretskii
2018-06-03 0:02 ` Michael Heerdegen
2018-06-03 0:46 ` Drew Adams
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