>
> The files that have a line like
>
> ;; Package-Requires: ((emacs "26.1") (xref "1.0.2"))
>
> or similar should be handled with more care, yes -- they have to be
> backwards-compatible, and `format-prompt' is new in Emacs 28.  So if you
> could re-spin the patch without changes to files like that, I'll get it
> applied (it looks good otherwise).
>
> There are some packages that are maintained for older Emacs versions,
> too, but we unfortunately have no markup to say that explicitly.
> Looking over the list, I think this affects only these two files, and
> should also be removed from the patch:
>
>  lisp/progmodes/cc-styles.el
>  lisp/progmodes/verilog-mode.el

Hi Lars,

Thanks so much for your review. Here is an updated patch that removes
the mentioned files (project.el, cc-styles.el and verilog-mode.el) and
updates the 'format-prompt' function with the suggestion from Dmitry
Gutov to consider an empty DEFAULT as nil. Let me know if something
could be improved.