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bug#27016: possible bug in `defsetf'
From: |
npostavs |
Subject: |
bug#27016: possible bug in `defsetf' |
Date: |
Mon, 22 May 2017 17:18:32 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
tags 27016 - unreproducible
found 27016 24.4
found 27016 25.2
quit
Rafael D Sorkin <rsorkin@perimeterinstitute.ca> writes:
> Following your suggestion I tried starting with "emacs -Q" and
> got the same results as you did. However if I (require 'cl)
> then the bug returns. (I normally require CL automatically on
> starting emacs.) So perhaps it's an incompatibility between CL
> and the new way that defsetf is implemented.
Oh, right, I see it now. It happens in 24.4 and later. I'm not sure
it's a bug though. My guess is that the difference is eager
macroexpansion. When I compile, then I get the same behaviour with 24.3
(that's my earliest working Emacs build) as well.
$ emacs -Q -batch -l cl -f batch-byte-compile bug-27016-defsetf.el
In toplevel form:
bug-27016-defsetf.el:1:1:Warning: cl package required at runtime
bug-27016-defsetf.el:3:1:Warning: global/dynamic var `pair' lacks a prefix
Wrote /home/npostavs/src/emacs/bug-27016-defsetf.elc
$ emacs -Q -batch -l bug-27016-defsetf.elc
pair: (0 . 4)
where bug-27016-defsetf.el has contents:
(require 'cl)
(defvar pair nil)
(setq pair (cons 3 4)) ; (3 . 4)
(unless t
(defalias 'foobar 'cons)
(defsetf foobar setcar)) ; nil
(setf (foobar pair) 0) ; 0 !
(message "pair: %S" pair)
- bug#27016: possible bug in `defsetf', Rafael D Sorkin, 2017/05/22
- bug#27016: possible bug in `defsetf', npostavs, 2017/05/22
- bug#27016: possible bug in `defsetf', Rafael D Sorkin, 2017/05/22
- bug#27016: possible bug in `defsetf',
npostavs <=
- bug#27016: possible bug in `defsetf', Michael Heerdegen, 2017/05/22
- bug#27016: possible bug in `defsetf', npostavs, 2017/05/22
- bug#27016: possible bug in `defsetf', Michael Heerdegen, 2017/05/22
- bug#27016: possible bug in `defsetf', npostavs, 2017/05/22
- bug#27016: possible bug in `defsetf', Michael Heerdegen, 2017/05/22
bug#27016: possible bug in `defsetf', Rafael D Sorkin, 2017/05/22
bug#27016: possible bug in `defsetf', Rafael D Sorkin, 2017/05/24