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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Find tags with dot character
Date: Mon, 22 Jul 2019 20:32:48 +0300
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Mon, 22 Jul 2019 11:36:39 -0400
> 
> I know the general issue of namespaces is not handled very well by the
> etags support.

In general, this support requires something in etags the program: it
should know about class-qualified identifiers and put in TAGS both the
qualified and the unqualified forms.  Then M-. will suggest both as
possible candidates.