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This implements the wording changes in P2415R2 "What is a view?", which is a DR for C++20. libstdc++-v3/ChangeLog: * include/bits/ranges_base.h (__detail::__is_initializer_list): Define. (viewable_range): Adjust as per P2415R2. * include/bits/ranges_cmp.h (__cpp_lib_ranges): Adjust value. * include/std/ranges (owning_view): Define as per P2415R2. (enable_borrowed_range<owning_view>): Likewise. (views::__detail::__can_subrange): Replace with ... (views::__detail::__can_owning_view): ... this. (views::_All::_S_noexcept): Sync with operator(). (views::_All::operator()): Use owning_view instead of subrange as per P2415R2. * include/std/version (__cpp_lib_ranges): Adjust value. * testsuite/std/ranges/adaptors/all.cc (test06): Adjust now that views::all uses owning_view instead of subrange. (test08): New test. * testsuite/std/ranges/adaptors/lazy_split.cc (test09): Adjust now that rvalue non-view non-borrowed ranges are viewable. * testsuite/std/ranges/adaptors/split.cc (test06): Likewise.