A std::unique_ptr is moved into a lambda via init-capture, then the lambda is assigned to a std::function (C++17). What happens at line X?

#include <memory> #include <functional> auto up = std::make_unique<int>(5); auto lam = [p = std::move(up)]() { return *p; }; std::function<int()> f = std::move(lam); // line X