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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/103549] [12 regression] Uninitialized member warning
 from regex header
Date: Sat, 04 Dec 2021 01:00:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103549

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-12-04
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think this is intentional, or at least not a bug. The match_results type
can't be used for much until it's "ready" and the member will be set then.

But it looks like this would read the indeterminate value:

cmatch m1, m2;
m1.swap(m2);

So we should initialize it as you suggest.=