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bug#19554: 25.0.50; void-function xref-marker-stack-empty-p and subseque

From: Stefan Monnier
Subject: bug#19554: 25.0.50; void-function xref-marker-stack-empty-p and subsequent abort
Date: Tue, 13 Jan 2015 10:21:25 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) 
>> :visible (and (featurep 'xref) (not (xref-marker-stack-empty-p)))

It's generally better to use (and (fboundp 'xref-marker-stack-empty-p)
(not (xref-marker-stack-empty-p))).  E.g. the compiler understands it
(tho in this case, the compiler doesn't see this code anyway).


        Stefan
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