[Bug libstdc++/122425] optional is not ranges::borrowed_range

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122425

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
#include <ranges>
#include <optional>

static_assert(std::ranges::borrowed_range<std::optional<int&>>);