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bug#11258: 24.1.50; lexical binding inconsistencies

From: Michael Heerdegen
Subject: bug#11258: 24.1.50; lexical binding inconsistencies
Date: Mon, 16 Apr 2012 22:03:30 +0200


I have an elisp file with this content:

; Test  -*- lexical-binding: t -*-

(defun test1 (arg)
  (interactive "i")
  (funcall (lambda () arg)))

(defun test2 (arg)
  (interactive "i")
  ((lambda () arg)))

;; (test1 nil)
;; (test2 nil)

I visit the file and do M-x eval-buffer.  Then I do the following:

1(a) Put point after (test1 nil) and hit C-x C-e: nil
1(b) M-x test1: nil
2(a) Put point after (test2 nil) and hit C-x C-e
     If I had loaded my .emacs before, I get nil
     With emacs -Q, I get: Lisp error: (void-variable arg)
2(b) M-x test2: Lisp error: (void-variable arg)

Now, byte compile the file, and load the compiled code.  Now, repeat
the above four tests.  You always get nil, and no error.

That's strange - shouldn't the result always be nil?  If not, this
(surprising) behavior should be documented in the manual.

I've experimented a lot, and found that the results for 2(a) are not
always the same.

OTOH, the compiled code always works as expected (result nil).



In GNU Emacs (i486-pc-linux-gnu, GTK+ Version 3.2.3)
 of 2012-04-10 on zelenka, modified by Debian
 (emacs-snapshot package, version 2:20120410-1)
Windowing system distributor `The X.Org Foundation', version 11.0.11104000
Configured using:
 `configure '--build' 'i486-linux-gnu' '--host' 'i486-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--without-compress-info' '--with-crt-dir=/usr/lib/i386-linux-gnu/'
 '--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes'
 'build_alias=i486-linux-gnu' 'host_alias=i486-linux-gnu'

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