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

From: Johan Claesson
Subject: bug#23164: 25.1.50; xref-find-definitions with local tags-file-name fails
Date: Mon, 04 Apr 2016 10:53:41 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

I can also reproduce it on emacs-25 (commit f501116).
With valid TAGS file or /dev/zero.
I get the same backtrace.



Óscar Fuentes <address@hidden> writes:

> Dmitry Gutov <address@hidden> writes:
>> Thanks for the report, but that doesn't seem to be the case here. At
>> least if I replace "/dev/zero" with "~/vc/emacs/src/TAGS", the
>> scenario doesn't lead to an error (I just get "not found"), and if I
>> also use e.g. "CALLN" instead of "foo", the jump to the destination
>> occurs as expected.
> I can reproduce it here with an existing TAGS file, on emacs -Q.
> GNU Emacs (x86_64-unknown-linux-gnu, X toolkit) of 2016-04-03
> at commit fc3cd53900eb5e80b91b6d2615b3800fd2f59c16
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>   expand-file-name(nil)
>   tags-expand-table-name(nil)
>   visit-tags-table-buffer(t)
>   etags--xref-find-definitions("foo")
>   #[514 "\300!\207" [etags--xref-find-definitions] 4 "\n\n(fn BACKEND 
> SYMBOL)"](etags "foo")
>   apply(#[514 "\300!\207" [etags--xref-find-definitions] 4 "\n\n(fn BACKEND 
> SYMBOL)"] etags "foo")
>   xref-backend-definitions(etags "foo")
>   xref--find-xrefs("foo" definitions "foo" nil)
>   xref--find-definitions("foo" nil)
>   xref-find-definitions("foo")
>   eval((xref-find-definitions "foo") nil)
>   elisp--eval-last-sexp(nil)
>   eval-last-sexp(nil)
>   funcall-interactively(eval-last-sexp nil)
>   call-interactively(eval-last-sexp nil nil)
>   command-execute(eval-last-sexp)

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