[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
bug#15718: 24.3.50; `C-M-x' does not work, with `defcustom' inside `when
From: |
Lars Ingebrigtsen |
Subject: |
bug#15718: 24.3.50; `C-M-x' does not work, with `defcustom' inside `when' |
Date: |
Wed, 14 Aug 2019 19:57:02 -0700 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Drew Adams <drew.adams@oracle.com> writes:
> emacs -Q
>
> (when t
> (defcustom foo nil
> "..."
> :type boolean))
>
> M-x set-variable foo t
>
> Put point on foo in the defcustom sexp, and do `C-M-x'. `foo' is echoed
> in the echo area, giving you the impression that the defcustom was
> reevaluated, reinitializing `foo'.
>
> C-h v foo ;; => t, not nil.
>
> Without the `when', i.e., with the `defcustom' at top level, the value
> is nil, as a user would expect.
I think this works as documented:
--
Evaluate the top-level form containing point, or after point.
If the current defun is actually a call to ‘defvar’ or ‘defcustom’,
evaluating it this way resets the variable using its initial value
expression (using the defcustom’s :set function if there is one), even
if the variable already has some other value. (Normally ‘defvar’ and
‘defcustom’ do not alter the value if there already is one.)
--
So only if the def* is top-level does the magic DWIM value-setting thing
happen.
Closing.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
- bug#15718: 24.3.50; `C-M-x' does not work, with `defcustom' inside `when',
Lars Ingebrigtsen <=