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bug#16103: 24.3.50; `read' and circular objects
From: |
Drew Adams |
Subject: |
bug#16103: 24.3.50; `read' and circular objects |
Date: |
Tue, 10 Dec 2013 12:51:16 -0800 (PST) |
Dunno whether this is a bug. If it is not, I'd appreciate some help
understanding it. (elisp) `Circular Objects' does not seem to cover it,
AFAICT.
This Lisp code is in a file:
((last-sort-comparer
(bmkp-info-cp bmkp-gnus-cp bmkp-url-cp bmkp-local-file-type-cp)
bmkp-alpha-p)
(last-reverse-sort-p)
(last-reverse-multi-sort-p)
(last-latest-bookmark-alist #1=(#4=#("setq" 0 4
(bmkp-full-record #1#))
(filename . "~/.emacs")
(buffer-name . ".emacs")
(front-context-string . " (append (l")
(rear-context-string . "(setq load-path\n")
(front-context-region-string)
(rear-context-region-string)
(visits . 0)
(time . #2=(21158 44564 146055 551000))
(created . #2#)
(position . 17)))
(last-bmenu-omitted-bookmarks)
(last-bmenu-marked-bookmarks)
(last-bmenu-filter-function)
(last-bmenu-filter-pattern . #3="")
(last-bmenu-title . #3#)
(last-bmenu-bookmark . #4#)
(last-specific-buffer . #3#)
(last-specific-file . #3#)
(last-bmenu-toggle-filenames . t)
(last-bmenu-before-hide-marked-alist)
(last-bmenu-before-hide-unmarked-alist)
(last-bookmark-file . "/home/fcihh/.emacs.bmk"))
With point at bob in the file, I do (read (current-buffer)), and this
is the result:
((last-sort-comparer
(bmkp-info-cp bmkp-gnus-cp bmkp-url-cp bmkp-local-file-type-cp)
bmkp-alpha-p)
(last-reverse-sort-p)
(last-reverse-multi-sort-p)
(last-latest-bookmark-alist
(#("setq" 0 4
(bmkp-full-record #2))
(filename . "~/.emacs")
(buffer-name . ".emacs")
(front-context-string . " (append (l")
(rear-context-string . "(setq load-path\n")
(front-context-region-string)
(rear-context-region-string)
(visits . 0)
(time 21158 44564 146055 551000)
(created 21158 44564 146055 551000)
(position . 17)))
(last-bmenu-omitted-bookmarks)
(last-bmenu-marked-bookmarks)
(last-bmenu-filter-function)
(last-bmenu-filter-pattern . "")
(last-bmenu-title . "")
(last-bmenu-bookmark .
#("setq" 0 4
(bmkp-full-record
(#2
(filename . "~/.emacs")
(buffer-name . ".emacs")
(front-context-string . " (append (l")
(rear-context-string . "(setq load-path\n")
(front-context-region-string)
(rear-context-region-string)
(visits . 0)
(time 21158 44564 146055 551000)
(created 21158 44564 146055 551000)
(position . 17)))))
(last-specific-buffer . "")
(last-specific-file . "")
(last-bmenu-toggle-filenames . t)
(last-bmenu-before-hide-marked-alist)
(last-bmenu-before-hide-unmarked-alist)
(last-bookmark-file . "/home/fcihh/.emacs.bmk"))
Notice the remaining #2 occurrences. I would have expected the above
pp-written sexp to be similar to what was in the file: a representation
of similar circular list structure.
Or if not that, I would at least expect that all #-notation references
to shared structure would be resolved, so that there are no orphaned
references like #2.
I would prefer to have `read' give me the (equivalent/similar) list
structure, with circularities. But I could probably live with
`read' giving me a tree with copies where there originally was shared
structure (i.e., all # references resolved).
What I'm seeing looks to me like a bug. Help understanding is
appreciated. I write out a list structure that has circularities,
and I want to `read' the result to get back a similar structure. What
should I be doing differently, or what is it that I need to be aware
of, that I'm currently missing? Thx.
In GNU Emacs 24.3.50.2 (i686-pc-mingw32)
of 2013-11-28 on LEG570
Bzr revision: 115271 rgm@gnu.org-20131128203155-qjc1xsp19z2k64b2
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
`configure --enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1'
- bug#16103: 24.3.50; `read' and circular objects,
Drew Adams <=