collect_local_variables_in_iseq  742 vm.c               while (collect_local_variables_in_iseq(env->block.iseq, vars), (prev_envval = rb_vm_env_prev_envval(env)) != Qfalse) {
collect_local_variables_in_iseq  775 vm.c               while (collect_local_variables_in_iseq(iseq, &vars)) {