[Bug libstdc++/101055] [11/12 Regression] should use __has_cpp_attribute() with __ prefixed/suffixed names

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101055

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>