GNU bug report logs - #20123
24.4.91; Unwarranted "Unused lexical argument" for condition-case

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Package: emacs;

Reported by: Oleh Krehel <ohwoeowho <at> gmail.com>

Date: Mon, 16 Mar 2015 18:48:01 UTC

Severity: minor

Merged with 15103

Found in versions 24.3.50, 24.4.91

Fixed in version 25.1

Done: Stefan Monnier <monnier <at> IRO.UMontreal.CA>

Bug is archived. No further changes may be made.

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From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Oleh Krehel <ohwoeowho <at> gmail.com>
Cc: 20123 <at> debbugs.gnu.org
Subject: bug#20123: 24.4.91; Unwarranted "Unused lexical argument" for condition-case
Date: Mon, 16 Mar 2015 15:09:13 -0400

> Hello,
> Here's an example code:

>     (define-error 'unsupported-mode-error "Unsupported mode")
>     (condition-case e
>         (if (eq 'a 'a)
>             (message "test")
>           (signal 'unsupported-mode-error major-mode))
>       (unsupported-mode-error
>        (signal (car e) (cdr e)))
>       (error
>        (message "error")))

> As you can see, I'm trying to re-throw some of the errors, so the variable `e' is used
> inside `condition-case'. But I still get an "Unused lexical argument" warning.

Yes, IIRC this bug was introduced in 24.1.  It should be partially fixed
in 24.4 if you set byte-compile--use-old-handlers to nil.  It should be
fixed in 25.1 where this var defaults to nil.

Can you confirm?


        Stefan
This bug report was last modified 10 years and 72 days ago.

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