Noam Postavsky <npostavs@users.sourceforge.net> schrieb am So., 24. Sep.
2017 um 17:44 Uhr:

> Philipp Stephani <p.stephani2@gmail.com> writes:
>
> > * lisp/emacs-lisp/gv.el (buffer-local-value): Remove.
>
> Is it possible to just give an obsolete warning first?
>

I don't think it's possible in the sense of `make-obsolete' because the
expander is not a named function.
It would be possible to use `display-warning' within the body of the
setter, but that would only annoy users.
If necessary, we might add additional code to the `setf' macro to warn
about this form in particular during byte compilation.