GNU bug report logs - #34641
rx: (or ...) order unpredictable

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 34641 <at> debbugs.gnu.org
Subject: bug#34641: rx: (or ...) order unpredictable
Date: Sun, 24 Feb 2019 21:06:34 +0200

> From: Mattias Engdegård <mattiase <at> acm.org>
> Date: Sun, 24 Feb 2019 19:40:33 +0100
> 
> We could determine whether any string is a prefix of another. If not, regexp-opt should be safe to call. Alternatively, this check could be done in regexp-opt (activated by a flag). That would be my preferred short-term solution.

Your preferred solution is fine with me, FWIW.

> (Speaking of regexp-opt, it has another bug that does not affect rx: it returns the empty string if given an empty list of strings. The correct return value is a regexp that never matches anything. Fix it, document it, or turn it into an error?)

Fix it, I think.

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