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bug#37659: rx additions: anychar, unmatchable, unordered-or

From: Paul Eggert
Subject: bug#37659: rx additions: anychar, unmatchable, unordered-or
Date: Thu, 13 Feb 2020 10:50:41 -0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 2/13/20 10:38 AM, Mattias Engdegård wrote:
Now the regexp-opt KEEP-ORDER argument no longer serves any purpose; it was 
added for use by rx, and has no obvious use elsewhere. It could safely be 
removed to save some weight, unless you prefer it be kept as scar tissue.

Simplest would be to remove it in Emacs 27, and merge that change into master.

If that's too drastic, we can mark it as deprecated in Emacs 27 (though it is odd for a release to add a feature that is immediately deprecated), and remove it in the master branch.

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