parse.y:5520
static void
local_pop()
{
    struct local_vars *local = lvtbl->prev;

    if (lvtbl->tbl) {
	if (!lvtbl->nofree) free(lvtbl->tbl);
	else lvtbl->tbl[0] = lvtbl->cnt;
    }
    ruby_dyna_vars = lvtbl->dyna_vars;
    free(lvtbl);
    lvtbl = local;
}
