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All functions in testsuite_iterators.h are now marked constexpr, targeting the earliest possible standard. Most functions use C++14 due to multi-statement bodies, with exceptions: * BoundsContainer and some constructors are C++11 compatible. * OutputContainer is C++20 due to operator new/delete usage. Before C++23, each constexpr templated function requires a constexpr -suitable instantiation. Functions delegating to _GLIBCXX14_CONSTEXPR must also be _GLIBCXX14_CONSTEXPR; e.g., forward_iterator_wrapper's constructor calling input_iterator_wrapper's constructor, or operator-> calling operator*. For classes defined C++20 or later (e.g., test_range), constexpr is applied unconditionally. PR libstdc++/119137 libstdc++-v3/ChangeLog: * testsuite/23_containers/inplace_vector/cons/from_range.cc: Run iterators and range test at compile-time. * testsuite/23_containers/inplace_vector/modifiers/assign.cc: Likewise. * testsuite/23_containers/inplace_vector/modifiers/multi_insert.cc: Likewise. * testsuite/util/testsuite_iterators.h (__gnu_test::BoundsContainer) (__gnu_test::OutputContainer, __gnu_test::WritableObject) (__gnu_test::output_iterator_wrapper, __gnu_test::input_iterator_wrapper) (__gnu_test::forward_iterator_wrapper) (__gnu_test::bidirectional_iterator_wrapper) (__gnu_test::random_access_iterator_wrapper) (__gnu_test::test_container): Add appropriate _GLIBCXXNN_CONSTEXPR macros to member functions. (__gnu_test::contiguous_iterator_wrapper) (__gnu_test::input_iterator_wrapper_rval) (__gnu_test::test_range, __gnu_test::test_range_nocopy) (__gnu_test::test_sized_range_sized_sent) (__gnu_test::test_sized_range): Add constexpr specifier to member functions.