[Bug libstdc++/115046] meta-recursion when apply join_view with as_const_view

[hewillk at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115046

--- Comment #1 from 康桓瑋 <hewillk at gmail dot com> ---
Oh, maybe this is just because MSVC does not use std::optional but uses
_Defaultabox.