Paul Hodges <p...@cassland.org> writes:

> Thanks for the updates; I have places they will help!
>
> On simultaneous slurs, I guess that the identifiers were introduced in 
> 2.20, later than I've revisited that part of the manuals - the 2.18 
> learning manual still states the prohibition.

2.19.29 for \=

commit cf4323bf84b6880082f8e8bafcac87a282a0da7e
Author: David Kastrup <d...@gnu.org>
Date:   Sat Oct 3 07:58:57 2015 +0200

    Issue 4626/1: Create \= command for setting spanner-id

but the underlying feature is from 2.15.5:

commit 32776795a1be5c0ec472f59694510705607673b0
Author: Reinhold Kainhofer <reinh...@kainhofer.com>
Date:   Sat Jul 2 22:23:53 2011 +0200

    Fix issues 75 and 1256: Allow multiple concurrent slurs

and it's trivial to add a definition for \= (or a different name) in
code intended to run on 2.18.  The work is all there, just without a
tolerably convenient user interface and convincing documentation.

-- 
David Kastrup

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