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This paper removes the try_append_range from inplace_vector and changes the return type of try_emplace_back and try_push_back to optional<_Tp&> per: P4022R0: Remove try_append_range from inplace_vector for now. P3981R2: Better return types in std::inplace_vector and std::exception_ptr_cast. The test are also expanded to cover type Y, that is convertible to optional<Y&>, and require return type to be constructed using in_place. libstdc++-v3/ChangeLog: * include/bits/version.def (inplace_vector): Bump to 202603. * include/bits/version.h: Regenerate. * include/std/inplace_vector (inplace_vector::try_emplace_back) (inplace_vector::try_push_back): Change return type to optional<_Tp&> and adjust implementation accordingly. (inplace_vector::try_append_range): Remove. * include/debug/inplace_vector (inplace_vector::try_emplace_back) (inplace_vector::try_push_back, inplace_vector::try_append_range): Likewise. * testsuite/23_containers/inplace_vector/modifiers/single_insert.cc: Updated check for the optional<T&> return. Added test for type convertible to optional<T&> * testsuite/23_containers/inplace_vector/debug/invalidation/try_emplace_back.cc: Use has_value() to check if engaged optional is returned. * testsuite/23_containers/inplace_vector/debug/invalidation/try_push_back.cc: Likewise. * testsuite/23_containers/inplace_vector/modifiers/multi_insert.cc: Remove try_append_range tests. * testsuite/23_containers/inplace_vector/debug/invalidation/try_append_range.cc: Removed. * testsuite/23_containers/inplace_vector/version.cc: Updated expected feature test macro value. Reviewed-by: Jonathan Wakely <jwakely@redhat.com> Signed-off-by: Tomasz Kamiński <tkaminsk@redhat.com>