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Subject: |
Lisp reader: dotted pair notation not working when initial elements are omitted |
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Date: |
Tue, 7 Mar 2023 02:14:02 +0100 |
According to the Elisp docs
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Dotted-Pair-Notation.html),
one should be able to evaluate e.g.:
(. 1)
to:
1
This works correctly in Emacs 28.1 However, in the emacs-29 branch
(bd07cec) this results in:
*** Read error *** Invalid read syntax: "."
Since the description in the docs are the same in the emacs-29 I
assume this is a bug.
I believe this may have been caused by the changes implementing the
nonrecursive Lisp reader.
I believe the fix would be roughly:
- in read0 (lread.c), when handling c == '.', ensure we handle not
only the case where the top of the read stack is RE_list but *also*
RE_list_start.
- if the top of the stack was effectively RE_list_start, then the top
of the stack needs to be manipulated somehow so that at the end of
read0 the correct value is returned, when emptying the stack.
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--- Begin Message ---
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Subject: |
Re: bug#62020: Lisp reader: dotted pair notation not working when initial elements are omitted |
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Date: |
Sun, 12 Mar 2023 18:10:39 +0100 |
11 mars 2023 kl. 13.19 skrev Eli Zaretskii <eliz@gnu.org>:
>>> Documentation changes are always fine for a release branch, but I'd
>>> prefer to discuss a specific patch, if you don't mind posting one.
>>
>> Not at all. There's not much to see here -- the minimal change would just
>> remove a paragraph:
>
> OK, thanks.
Pushed to emacs-29.
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