Subject: bug#19699: closed (Re: bug#19699: 25.0.50; lexical-let + mapcar cause infloop)

From: [email-masked] (GNU bug Tracking System)
Date: Tue, 27 Jan 2015 23:56:02 +0000

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 [email-masked].

-- 
19699: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=19699
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: Re: bug#19699: 25.0.50; lexical-let + mapcar cause infloop
From: Katsumi Yamaoka <[email-masked]>
To: [email-masked]
Date: Wed, 28 Jan 2015 08:55:39 +0900
List-Id: <debbugs-submit.debbugs.gnu.org>

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.

Subject: 25.0.50; lexical-let + mapcar cause infloop
From: Katsumi Yamaoka <[email-masked]>
To: [email-masked]
Date: Tue, 27 Jan 2015 17:06:44 +0900
List-Id: <debbugs-submit.debbugs.gnu.org>

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'