[Bug libstdc++/65499] Missing "using namespace literals::chrono_literals" in std::chrono

[marejde at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65499

--- Comment #1 from Martin Ejdestig <marejde at gmail dot com> ---
See the end of 20.12.2 ("Header <chrono> synopsis").

Maybe it is too late for 5.0?