__swap_cur_stree
orig_stree = __swap_cur_stree(stree);
__swap_cur_stree(orig_stree);
orig = __swap_cur_stree(stree);
__swap_cur_stree(orig);
struct stree *__swap_cur_stree(struct stree *stree);
orig = __swap_cur_stree(all_return_states);
__swap_cur_stree(orig);