https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121068
--- Comment #19 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I'm seeing a new libstdc++ testsuite failure since r16-3022-gbc42128330c0ea
FAIL: 20_util/variant/102912.cc -std=gnu++20 (test for excess errors)
FAIL: 20_util/variant/102912.cc -std=gnu++23 (test for excess errors)
FAIL: 20_util/variant/102912.cc -std=gnu++26 (test for excess errors)
The error is:
in 'constexpr' expansion of 'std::destroy_at<const int>(__pointer)'
/home/jwakely/gcc/15/include/c++/15.1.1/bits/stl_construct.h:164:22:
164 | std::destroy_at(__pointer);
| ~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/jwakely/gcc/15/include/c++/15.1.1/bits/stl_construct.h:88:9: error:
modifying a const object '* __location' is not allowed in a constant expression
88 | __location->~_Tp();
| ^~~~~~~~~~
/home/jwakely/gcc/15/include/c++/15.1.1/variant:246:13: note: originally
declared 'const' here
246 | _Type _M_storage;
| ^~~~~~~~~~
