`rend_client_get_random_intro_impl` returns a pointer to a newly allocated `extend_info_t`, which `rend_client_any_intro_points_usable` drops on the floor. Introduced in [commit 748350ace11fa55758fb8bafe5e5556867dd9c23](https://gitweb.torproject.org/tor.git/commitdiff/748350ace11fa55758fb8bafe5e5556867dd9c23) (0.2.2.25-alpha), when `rend_client_any_intro_points_usable` was added.