GNU bug report logs - #71120
29.3; buglet in cl-loop

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Package: emacs;

Reported by: Philippe Schnoebelen <phs <at> lmf.cnrs.fr>

Date: Wed, 22 May 2024 14:49:02 UTC

Severity: normal

Found in version 29.3

Done: Stefan Kangas <stefankangas <at> gmail.com>

Bug is archived. No further changes may be made.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Philippe Schnoebelen <phs <at> lmf.cnrs.fr>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.3; buglet in cl-loop
Date: Wed, 22 May 2024 10:43:36 +0200

When I need a list of 100 random dice throws I write

	(cl-loop for i from 1 to 100 collect (random 6))

It compiles just fine.

If instead I use

	(cl-loop for _i from 1 to 100 collect (random 6))

then I get a compilation warning:

	foo.el:1:18: Warning: variable ‘_i’ not left unused

It should be the other way around.

The variable 'i' is unused in the first form and that deserves a warning 
at compile time. Otherwise the compiler will not help me catch the typo in

	(cl-loop for i from 0 to 10 do
	   (cl-loop for j from 0 to 10 do
	      (foo j j))) ;; <<<=== typo, I meant (foo i j)


--ph.schnoebelen, happy and thankful GNU Emacs user since 1983 (Thanks 
to all involved!!)
This bug report was last modified 79 days ago.

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