Package: emacs;
Reported by: Gemini Lasswell <gazally <at> runbox.com>
Date: Fri, 4 Nov 2016 15:58:01 UTC
Severity: normal
Found in version 26.0.50
Done: Johan Bockgård <bojohan <at> gnu.org>
Bug is archived. No further changes may be made.
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
Minor modes in effect:
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ws-butler-global-mode: t
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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))
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