GNU bug report logs - #19699
25.0.50; lexical-let + mapcar cause infloop

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Package: emacs;

Reported by: Katsumi Yamaoka <yamaoka <at> jpl.org>

Date: Tue, 27 Jan 2015 08:08:02 UTC

Severity: normal

Found in version 25.0.50

Done: Katsumi Yamaoka <yamaoka <at> jpl.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#19699; Package emacs. (Tue, 27 Jan 2015 08:08:02 GMT) Full text and rfc822 format available.
Acknowledgement sent to Katsumi Yamaoka <yamaoka <at> jpl.org>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Tue, 27 Jan 2015 08:08:02 GMT) Full text and rfc822 format available.

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

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; lexical-let + mapcar cause infloop
Date: Tue, 27 Jan 2015 17:06:44 +0900

A Lisp form that uses `lexical-let' and `mapcar' (or `mapc'),
like this, cannot be evaluated nor byte-compiled because it
looks like causing an infinite loop[1].

(defun testing ()
  (lexical-let (var)
    (mapcar #'identity '("Hello" "World"))))

[1] There is no means to stop infloop on Cygwin Emacs, so I'm
  hard to debug it.

In GNU Emacs 25.0.50.1 (i686-pc-cygwin, GTK+ Version 3.10.9)
 of 2015-01-27 on localhost
Windowing system distributor `The Cygwin/X Project', version 11.0.11501000
Configured using:
 `configure --verbose --with-x-toolkit=gtk3'
Reply sent to Katsumi Yamaoka <yamaoka <at> jpl.org>:
You have taken responsibility. (Tue, 27 Jan 2015 23:56:02 GMT) Full text and rfc822 format available.
Notification sent to Katsumi Yamaoka <yamaoka <at> jpl.org>:
bug acknowledged by developer. (Tue, 27 Jan 2015 23:56:02 GMT) Full text and rfc822 format available.

Message #10 received at 19699-done <at> debbugs.gnu.org (full text, mbox):

From: Katsumi Yamaoka <yamaoka <at> jpl.org>
To: 19699-done <at> debbugs.gnu.org
Subject: Re: bug#19699: 25.0.50; lexical-let + mapcar cause infloop
Date: Wed, 28 Jan 2015 08:55:39 +0900

On Tue, 27 Jan 2015 17:06:44 +0900, Katsumi Yamaoka wrote:
> A Lisp form that uses `lexical-let' and `mapcar' (or `mapc'),
> like this, cannot be evaluated nor byte-compiled because it
> looks like causing an infinite loop[1].

Oops, this is my fault that was made as the revno
<1fe087a1ab4182b2e6c1d05444461acc4e78e2d8> in cl.el.

> (defun testing ()
>   (lexical-let (var)
>     (mapcar #'identity '("Hello" "World"))))

The cause of the infinite loop is that the macro expander tries
to expand #'foo again and again.  Fixed.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Wed, 25 Feb 2015 12:24:04 GMT) Full text and rfc822 format available.
This bug report was last modified 10 years and 118 days ago.

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