It's
just a fact of life that major modes can't really use "new" elisp
features until they've penetrated fully into the installed user base -
after several years and several releases.
We can use this feature right away. There are a few major modes that
are distributed separately, and try to support old Emacs versions. It
is ok to do that, but that must not be an obstacle to making the next
version of Emacs work right.
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