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bug#4755: 23.1; case where `C-M-x' on defcustom doesn't seem to work
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bug#4755: 23.1; case where `C-M-x' on defcustom doesn't seem to work |
Date: |
Tue, 05 Jul 2016 00:14:55 -0400 |
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Gnus/5.13 (Gnus v5.13) Emacs/25.0.93 (gnu/linux) |
tags 4755 unreproducible
quit
"Drew Adams" <drew.adams@oracle.com> writes:
> emacs -Q
>
> (defcustom foo '(("foo" (f1 f2) f3) ("bar" (b1 b2) b3))
> "..."
> :type '(repeat
> (cons
> (choice :tag "a" string symbol)
> (choice
> (const :tag "b" nil)
> (function :tag "c")
> (list :tag "d"
> (repeat (function :tag "e"))
> (choice
> (const :tag "f" nil)
> (function :tag "g")))))))
>
> (defcustom toto (copy-sequence foo)
> "..."
> :type '(repeat
> (cons
> (choice :tag "r" string symbol)
> (choice
> (const :tag "s" nil)
> (function :tag "t")
> (list :tag "u"
> (repeat (function :tag "v"))
> (choice
> (const :tag "w" nil)
> (function :tag "x")))))))
>
> (defun f1 ())
> (defun f2 ())
> (defun f3 ())
>
> (defun b1 ())
> (defun b2 ())
> (defun b3 ())
>
> Then M-x customize-option foo
>
> Insert another alist element, then set the value for the session, so
> foo's value now has 3 alist elements. Option toto's value is like
> foo's, but it is missing the first alist element (the new one).
>
> Put point on toto's defcustom and do `C-M-x'. The value is not updated
> to be a copy of foo's current value. The value looks like it hasn't
> changed.
>
> AFAIK, there are no side effects going on here. And if you explicitly
> do (setq toto (copy-sequence foo)), then it of course does get updated
> to reflect the latest foo value.
>
> Seems like a bug. There's no doubt a simpler test case, but I have this
> ready-to-hand and don't feel like paring it down.
>
>
>
> In GNU Emacs 23.1.1 (i386-mingw-nt5.1.2600)
> of 2009-07-29 on SOFT-MJASON
> Windowing system distributor `Microsoft Corp.', version 5.1.2600
> configured using `configure --with-gcc (4.4)'
>
Can't reproduce on Emacs 23.4, perhaps it was fixed?
- bug#4755: 23.1; case where `C-M-x' on defcustom doesn't seem to work,
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