bug#57102: 29.0.50; Peculiar file-name-split edge case

[Lars Ingebrigtsen]

Stefan Kangas <stefankangas@gmail.com> writes:

> But, thinking more about this, maybe we would want a new function.
> Because this is not fun:
>
>     (apply #'file-name-concat (file-name-split "/foo/bar"))
>     => "foo/bar"

Uhm...  is that a bug, though?

> I'd like it better if it worked like this:
>
>     (file-name-join (file-name-split "/foo/bar"))
>     => "/foo/bar"
>
> And then there are the issues Mattias has pointed out.  One small step
> in the right direction would be to make sure that:
>
>     (equal (file-name-split "/foo")
>            (file-name-split "//foo"))

That seems like a bug.  :-/