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Re: default-toplevel-value and set-default-toplevel-value
From: |
Stefan Monnier |
Subject: |
Re: default-toplevel-value and set-default-toplevel-value |
Date: |
Mon, 12 Dec 2016 11:57:09 -0500 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux) |
> These functions were evidently introduced in Emacs 24.4, but they are
> not documented, neither in NEWS nor in the ELisp manual. The doc
> strings are minimal, and leave me confused about how these are
> different from default-value and set-default. Is this just about a
> possible let-binding of a localized variable,
Yes.
> or is there something else involved?
No, that's it.
> And why did the commit that added these functions also made changes in
> Custom functions?
Because this was introduced to make defvar (and defcustom) operate on
the default-toplevel-value rather than on the default-value, to avoid
problems when loading, from within a let-binding of foo-bar, a file `foo`
which defines foo-bar. E.g. this happens when `foo-operate` is
autoloaded in code like:
(let ((foo-bar t))
(foo-operate ...))
-- Stefan
- default-toplevel-value and set-default-toplevel-value, Eli Zaretskii, 2016/12/12
- Re: default-toplevel-value and set-default-toplevel-value,
Stefan Monnier <=
- Re: default-toplevel-value and set-default-toplevel-value, Eli Zaretskii, 2016/12/24
- Re: default-toplevel-value and set-default-toplevel-value, Eli Zaretskii, 2016/12/25
- Re: default-toplevel-value and set-default-toplevel-value, Stefan Monnier, 2016/12/25
- Re: default-toplevel-value and set-default-toplevel-value, Eli Zaretskii, 2016/12/26
- Re: default-toplevel-value and set-default-toplevel-value, Stefan Monnier, 2016/12/26
- Re: default-toplevel-value and set-default-toplevel-value, Eli Zaretskii, 2016/12/26
- Re: default-toplevel-value and set-default-toplevel-value, Stefan Monnier, 2016/12/26