Function f2

example/when_any.cpp:20–25

}

task<void> f2() {
    printf("f2 start.\n");
    co_await timeout(std::chrono::seconds{2});
    printf("f2 done.\n");
    co_return;
}

task<> run() {
    // var : std::variant<std::monostate, int, const char *>;