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bug#31027: 27.0.50; xref, tags-location-ring equivalent

From: Juri Linkov
Subject: bug#31027: 27.0.50; xref, tags-location-ring equivalent
Date: Wed, 04 Apr 2018 23:59:13 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

>>> What about 'M-x previous error'? Or 'C-u - M-x next-error', to mirror
>>> your example.
>> That's useful, but also different in nature and scope to a global
>> ring, which would not use a local variable (`next-error-function') to
> Whether next-error-function is going to be local or not, is subject to
> discussion, see https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20489 and
> https://debbugs.gnu.org/cgi/bugreport.cgi?bug=30674.

I have a wish to close these overgrown bugreports and redesign this feature
from scratch ;)

>> navigate to other "errors".  An "xref-location-ring" would be simpler.
> What's simpler about that? You'd need some new commands to use it as
> well, right?

Is the idea to use a ring of next-error capable buffers?
So that the next-error command in the current buffer
will return a list of all potentially next-error capable buffers
and allow the user to select the required one.

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