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From: | Reuben Thomas |
Subject: | bug#46331: provided-mode-derived-p doesn't work on aliases |
Date: | Sat, 6 Feb 2021 11:22:31 +0000 |
Reuben Thomas <rrt@sc3d.org> writes:
> _javascript_-mode is an alias for js-mode, and some third-party modes (e.g.
> json-mode) derive from it.
>
> (provided-mode-derived-p 'js-mode 'prog-mode) == t
>
> but
>
> (provided-mode-derived-p '_javascript_-mode 'prog-mode) == nil
>
> Hence in json-mode, (derived-mode-p 'prog-mode) evaluates to nil, which seems
> unfortunate.
Yup. I've now changed the function to also work on MODE parameters that
are function aliases.
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