public static boolean single_parameter_lambda_expression(PsiBuilder b, int l) {
    if (!recursion_guard_(b, l, "single_parameter_lambda_expression")) return false;
    boolean r;
    Marker m = enter_section_(b, l, _NONE_, LAMBDA_EXPRESSION, "<single parameter lambda expression>");
    r = single_parameter_lambda_expression_0(b, l + 1);
    if (!r) r = clear_variants_and_fail(b, l + 1);
    exit_section_(b, l, m, r, false, null);
    return r;
  }
public static boolean single_parameter_lambda_expression(PsiBuilder b, int l)