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>
Subject: bug#19699: closed (Re: bug#19699: 25.0.50; lexical-let + mapcar
 cause infloop)
Date: Tue, 27 Jan 2015 23:56:02 +0000

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Your bug report

#19699: 25.0.50; lexical-let + mapcar cause infloop

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 19699 <at> debbugs.gnu.org.

-- 
19699: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19699
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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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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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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