bug#54359: 29.0.50; [PATCH] Undo breaking change to project interface

[Dmitry Gutov]

On 17.03.2022 13:28, Lars Ingebrigtsen wrote:
> Rudolf Adamkovič<salutis@me.com>  writes:
>
> > I did not post the patch, but I too noticed the breakage when I could
> > not open a project at work out of sudden.  I had to change my
> > configuration file as follows:
> >
> >   (defun my/project-try-local (dir)
> >     "Find projects marked with a '.project' stamp file."
> >     (let ((project-dir (locate-dominating-file dir ".project")))
> > -    (if project-dir (cons 'vc project-dir) nil)))
> > +    (if project-dir `(vc Git ,project-dir) nil)))
> Right.  Then I think Dick's patch seems like the right solution here,
> but I'm largely unfamiliar with project.el.  Dmitry?

Of course not.

And my/project-try-local shouldn't reuse the data type belonging to the 
vc project type either.

If it used its own type tag and generic method implementations, it 
wouldn't see this kind of breakage.