static boolean pattern_aux(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "pattern_aux")) return false;
    boolean r;
    r = concatenated_pattern(b, l + 1);
    if (!r) r = elemental_pattern(b, l + 1);
    return r;
  }
static boolean pattern_aux(PsiBuilder b, int l)