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e654460418
```
cd /d D:\a\pybind11\pybind11\build3\tests && D:\a\_temp\msys64\mingw64\bin\c++.exe -DPYBIND11_ENABLE_TYPE_CASTER_ODR_GUARD_IF_AVAILABLE -DPYBIND11_TEST_BOOST -DPYBIND11_TEST_EIGEN -Dpybind11_tests_EXPORTS @CMakeFiles/pybind11_tests.dir/includes_CXX.rsp -Os -DNDEBUG -fvisibility=hidden -Wall -Wextra -Wconversion -Wcast-qual -Wdeprecated -Wundef -Wnon-virtual-dtor -Werror -std=c++17 -MD -MT tests/CMakeFiles/pybind11_tests.dir/test_stl.cpp.obj -MF CMakeFiles\pybind11_tests.dir\test_stl.cpp.obj.d -o CMakeFiles\pybind11_tests.dir\test_stl.cpp.obj -c D:\a\pybind11\pybind11\tests\test_stl.cpp
In file included from D:/a/pybind11/pybind11/include/pybind11/stl.h:32,
from D:\a\pybind11\pybind11\tests\test_stl.cpp:10:
In member function 'std::enable_if_t<((__exactly_once<std::variant<_Types>::__accepted_type<_Tp&&, typename std::enable_if<__not_self<_Tp&&>, void>::type> > && is_constructible_v<std::variant<_Types>::__accepted_type<_Tp&&, typename std::enable_if<__not_self<_Tp&&>, void>::type>, _Tp>) && is_assignable_v<std::variant<_Types>::__accepted_type<_Tp&&, typename std::enable_if<__not_self<_Tp&&>, void>::type>&, _Tp>), std::variant<_Types>&> std::variant<_Types>::operator=(_Tp&&) [with _Tp = std::nullptr_t; _Types = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]',
inlined from 'std::enable_if_t<((__exactly_once<std::variant<_Types>::__accepted_type<_Tp&&, typename std::enable_if<__not_self<_Tp&&>, void>::type> > && is_constructible_v<std::variant<_Types>::__accepted_type<_Tp&&, typename std::enable_if<__not_self<_Tp&&>, void>::type>, _Tp>) && is_assignable_v<std::variant<_Types>::__accepted_type<_Tp&&, typename std::enable_if<__not_self<_Tp&&>, void>::type>&, _Tp>), std::variant<_Types>&> std::variant<_Types>::operator=(_Tp&&) [with _Tp = std::nullptr_t; _Types = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]' at D:/a/_temp/msys64/mingw64/include/c++/12.1.0/variant:1469:2,
inlined from 'bool pybind11::detail::variant_caster<V<Ts ...> >::load_alternative(pybind11::handle, bool, pybind11::detail::type_list<U, Us ...>) [with U = std::nullptr_t; Us = {}; V = std::variant; Ts = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]' at D:/a/pybind11/pybind11/include/pybind11/stl.h:375:19,
inlined from 'bool pybind11::detail::variant_caster<V<Ts ...> >::load_alternative(pybind11::handle, bool, pybind11::detail::type_list<U, Us ...>) [with U = double; Us = {std::nullptr_t}; V = std::variant; Ts = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]' at D:/a/pybind11/pybind11/include/pybind11/stl.h:378:32,
inlined from 'bool pybind11::detail::variant_caster<V<Ts ...> >::load_alternative(pybind11::handle, bool, pybind11::detail::type_list<U, Us ...>) [with U = std::__cxx11::basic_string<char>; Us = {double, std::nullptr_t}; V = std::variant; Ts = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]' at D:/a/pybind11/pybind11/include/pybind11/stl.h:378:32,
inlined from 'bool pybind11::detail::variant_caster<V<Ts ...> >::load_alternative(pybind11::handle, bool, pybind11::detail::type_list<U, Us ...>) [with U = int; Us = {std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}; V = std::variant; Ts = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]' at D:/a/pybind11/pybind11/include/pybind11/stl.h:378:32:
D:/a/_temp/msys64/mingw64/include/c++/12.1.0/variant:1475:38: error: 'caster.pybind11::detail::type_caster_odr_guard<std::nullptr_t, pybind11::detail::type_caster<std::nullptr_t, void> >::<unnamed>.pybind11::detail::type_caster<std::nullptr_t, void>::<unnamed>.pybind11::detail::void_caster<std::nullptr_t>::value' may be used uninitialized [-Werror=maybe-uninitialized]
1475 | std::get<__index>(*this) = std::forward<_Tp>(__rhs);
| ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
D:/a/pybind11/pybind11/include/pybind11/stl.h: In function 'bool pybind11::detail::variant_caster<V<Ts ...> >::load_alternative(pybind11::handle, bool, pybind11::detail::type_list<U, Us ...>) [with U = int; Us = {std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}; V = std::variant; Ts = {int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, std::nullptr_t}]':
D:/a/pybind11/pybind11/include/pybind11/stl.h:373:14: note: 'caster.pybind11::detail::type_caster_odr_guard<std::nullptr_t, pybind11::detail::type_caster<std::nullptr_t, void> >::<unnamed>.pybind11::detail::type_caster<std::nullptr_t, void>::<unnamed>.pybind11::detail::void_caster<std::nullptr_t>::value' was declared here
373 | auto caster = make_caster<U>();
| ^~~~~~
cc1plus.exe: all warnings being treated as errors
```
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