TAILQ_INSERT_TAIL
TAILQ_INSERT_TAIL(free_tailq, scb, links.tqe);
TAILQ_INSERT_TAIL(untagged_q, scb, links.tqe);
TAILQ_INSERT_TAIL(&cs_tailq, new_cs, links);
TAILQ_INSERT_TAIL(&SLIST_FIRST(&scope_stack)->inner_scope,