GNU bug report logs - #24876
26.0.50; alist copied by copy-tree shares structure with original

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

From: Gemini Lasswell <gazally <at> runbox.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50; alist copied by copy-tree shares structure with original
Date: Fri, 04 Nov 2016 08:51:36 -0700

copy-tree will recursively copy structures inside of vectors if you pass
it a non-nil vecp argument. But it fails to recursively copy structures
inside of vectors in alists constructed with dotted pairs. To reproduce,
enter the following code into *scratch* and M-x eval-buffer RET:

(defun my-copy-tree-bug ()
  (let* ((vec-ab (vector 'a 'b))
	 (vec-abcd (vector vec-ab (vector 'c 'd)))
	 (vec-alist (list (list 'key vec-abcd)))
	 (vec-alist-copy (copy-tree vec-alist t))
	 (vec-dotted-alist (list (cons 'key vec-abcd)))
	 (vec-dotted-alist-copy (copy-tree vec-dotted-alist t)))
    (message "Before:")
    (message " Original: %S \tCopy: %S" vec-alist vec-alist-copy)
    (message " Original: %S \tCopy: %S" vec-dotted-alist vec-dotted-alist-copy)

    (aset vec-ab 0 'foo)
    (message "After change to original:")
    (message " Original: %S \tCopy: %S" vec-alist vec-alist-copy)
    (message " Original: %S \tCopy: %S" vec-dotted-alist vec-dotted-alist-copy)))

(my-copy-tree-bug)

Result:
The copy is independent of the original of the alist constructed
with a list but not independent of the original of the alist constructed
with a dotted pair.



In GNU Emacs 26.0.50.23 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version 10.11.6 (Build 15G1004))
 of 2016-11-03 built on rainbow.local
Repository revision: 1a2e210db7d85d8cf5f7205a0e4acc49f2ac6e67
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
 Original: ((key . [(foo b) (c d)])) 	Copy: ((key . [(foo b) (c d)]))
" Original: ((key . [(foo b) (c d)])) 	Copy: ((key . [(foo b) (c d)]))"
my-copy-tree-bug
Before:
 Original: ((key [[a b] [c d]])) 	Copy: ((key [[a b] [c d]]))
 Original: ((key . [[a b] [c d]])) 	Copy: ((key . [[a b] [c d]]))
After change to original:
 Original: ((key [[foo b] [c d]])) 	Copy: ((key [[a b] [c d]]))
 Original: ((key . [[foo b] [c d]])) 	Copy: ((key . [[foo b] [c d]]))
" Original: ((key . [[foo b] [c d]])) 	Copy: ((key . [[foo b] [c d]]))"

Configured using:
 'configure --with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

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Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 755982 118671)
 (symbols 48 47054 1)
 (miscs 40 3486 3707)
 (strings 32 120683 149916)
 (string-bytes 1 3559912)
 (vectors 16 77911)
 (vector-slots 8 1922399 95872)
 (floats 8 1077 1577)
 (intervals 56 28644 4185)
 (buffers 976 37))

Message #10 received at 24876-done <at> debbugs.gnu.org (full text, mbox):

From: Johan Bockgård <bojohan <at> gnu.org>
To: 24876-done <at> debbugs.gnu.org
Subject: Re: bug#24876: 26.0.50;
 alist copied by copy-tree shares structure with original
Date: Sat, 05 Nov 2016 16:38:04 +0100

Fixed in master.

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