bug#46268: 27.1.91; Error in occur-rename-buffer

[Stefan Monnier]

> +             (mapconcat (lambda (boo)
> +                          (or (and (buffer-live-p boo)
> +                                   (buffer-name boo))

`buffer-name` used to be the function that provided the functionality of
`buffer-live-p`, so you can replace

    (and (buffer-live-p boo)
         (buffer-name boo))

with just

    (buffer-live-p boo)

By definition of a buffer is live iff it has a name.

> +                              (and (overlayp boo)
> +                                   (buffer-live-p (overlay-buffer boo))
> +                                   (buffer-name (overlay-buffer boo)))))

And here you can further simplify because `overlay-buffer` only returns
non-nil if the buffer is live.


        Stefan