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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/99402] [10/11 Regression] std::copy creates
 _GLIBCXX_DEBUG false positive for attempt to subscript a dereferenceable
 (start-of-sequence) iterator
Date: Fri, 05 Mar 2021 12:16:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99402

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
      Known to work|                            |9.3.0
   Target Milestone|---                         |10.3
            Summary|std::copy creates           |[10/11 Regression]
                   |_GLIBCXX_DEBUG false        |std::copy creates
                   |positive for attempt to     |_GLIBCXX_DEBUG false
                   |subscript a dereferenceable |positive for attempt to
                   |(start-of-sequence)         |subscript a dereferenceable
                   |iterator                    |(start-of-sequence)
                   |                            |iterator
                 CC|                            |fdumont at gcc dot gnu.org
      Known to fail|                            |10.1.0, 10.2.0, 11.0
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-03-05

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Probably caused by r276600=