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By trying to reuse the existing std::_Construct function as a wrapper for std::construct_at I introduced regressions, because changing std::_Construct to return non-void made it ill-formed for array types. The solution is to revert _Construct to its former state, and change allocator_traits::construct to explicitly call construct_at instead. This decouples all the existing callers of _Construct from the new construct_at requirements. PR libstdc++/94831 * include/bits/alloc_traits.h (_S_construct): Restore placement new-expression for C++11/14/17 and call std::construct_at directly for C++20. * include/bits/stl_construct.h (_Construct): Revert to non-constexpr function returning void. * testsuite/20_util/specialized_algorithms/ uninitialized_value_construct/94831.cc: New test. * testsuite/23_containers/vector/cons/94831.cc: New test.
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