bug#55039: [PATCH] Use VC-relative file names in ChangeLog entries

[Lars Ingebrigtsen <larsi@gnus.org>]

Philip Kaludercic <philipk@posteo.net> writes:

> Generally speaking, the ability to set a variable only if the symbol is
> bound would be useful for features like these.

Yes, that would be very nice.  But I think introducing something like
that would be difficult...

Introduce a new syntax like

;; Local Variables:
;; foo-bar: t boundp
;; End:

is difficult to make backwards-compatible, but perhaps we can come up
with something that older Emacsen will ignore but newer ones can parse?

We could also introduce a new section for these variables:

;; Boundp Local Variables:
;; foo-bar: t
;; End:

But...  I'm not much fan of that.