public static boolean tuple_assignment_expression(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "tuple_assignment_expression")) return false;
    if (!nextTokenIsSmart(b, T_LPAREN)) return false;
    boolean r;
    Marker m = enter_section_(b);
    r = single_tuple_assignment(b, l + 1);
    if (!r) r = multi_tuple_assignment(b, l + 1);
    exit_section_(b, m, TUPLE_ASSIGNMENT_EXPRESSION, r);
    return r;
  }
public static boolean tuple_assignment_expression(PsiBuilder b, int l)