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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Katsumi Yamaoka <yamaoka <at> jpl.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#19699: closed (25.0.50; lexical-let + mapcar cause infloop)
Date: Tue, 27 Jan 2015 23:56:02 +0000

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Your message dated Wed, 28 Jan 2015 08:55:39 +0900
with message-id <b4mfvavdbic.fsf <at> jpl.org>
and subject line Re: bug#19699: 25.0.50; lexical-let + mapcar cause infloop
has caused the debbugs.gnu.org bug report #19699,
regarding 25.0.50; lexical-let + mapcar cause infloop
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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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'

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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.

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