bug#23164: 25.1.50; xref-find-definitions with local tags-file-name fails

[Josiah Schwab]

Hello,

I receive an error from commands like the original bug

> (setq-local tags-file-name "fruits/TAGS")
> (xref-find-definitions "apple")

and the proposed workaround

> (visit-tags-table "fruits/TAGS" t)
> (xref-find-definitions "apple")

under emacs 25.1 and git master (at c542fab).

I used a trivial TAGS file, available from

  https://github.com/jschwab/emacs-tags-issues/blob/master/fruits/TAGS

but any simple tags file (that doesn't include other TAGS files; see
earlier in this thread) ought to work.

Josiah