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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/101055] [11/12 Regression] should use
 __has_cpp_attribute() with __ prefixed/suffixed names
Date: Mon, 14 Jun 2021 10:03:13 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101055

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |10.3.0
            Summary|should use                  |[11/12 Regression] should
                   |__has_cpp_attribute() with  |use __has_cpp_attribute()
                   |__ prefixed/suffixed names  |with __ prefixed/suffixed
                   |                            |names
      Known to fail|                            |11.1.0, 12.0

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is a regression, because this should be valid in C++11/14/17 (but not
C++20)

#define no_unique_address 1
#include <tuple>=