GNU bug report logs - #63586
29.x: dotimes (possible) problem

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From: balducci <at> units.it
To: 63586 <at> debbugs.gnu.org
Subject: bug#63586: 29.x: dotimes (possible) problem
Date: Fri, 19 May 2023 17:10:44 +0200

hello

the dotimes macro behaves differently in 29.x with respect to previous
versions

Basically: changing the value of the loop variable in the body of
dotimes does not seem to have any effect, where for versions <29.x it
used to.

Here is a minimal stretch of dummy code clarifying the problem I'm
reporting.

emacs-29.0.91 (or 29.0.90)
==========================

(dotimes (ii 10)
(insert (format "%2d " ii))
(when (= ii 4)(setq ii 11))
)
==>  0  1  2  3  4  5  6  7  8  9 

emacs-28.2 (or any version <29.x)
=================================

(dotimes (ii 10)
(insert (format "%2d " ii))
(when (= ii 4)(setq ii 11))
)
==>  0  1  2  3  4 

The ability to jump out of the loop by pushing the loop variable over
the upper limit is something that I happen to use in my scripts, so
29.x breaks them somehow

Of course, there are very many other equivalent ways to
accomplish the same result, but I don't see why this one
shouldn't be supported (any longer)

Is the changed behavior intentional? Am I missing some blatant point here?

AFAICS, changing the value of the loop variable from inside the loop
body is supported by any other language which I know about

thank you very much in advance for any hint/feedback

ciao
-gabriele

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