Fix issue 17514770 (https://b2.corp.google.com/issues/17514770)

tests/language/issue_1751477_lib31.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library lib31;
+
+import 'issue_1751477_lib1.dart';
+import 'issue_1751477_lib2.dart';
+import 'issue_1751477_lib3.dart';
+import 'issue_1751477_lib4.dart';
+import 'issue_1751477_lib5.dart';
+import 'issue_1751477_lib6.dart';
+import 'issue_1751477_lib7.dart';
+import 'issue_1751477_lib8.dart';
+import 'issue_1751477_lib9.dart';
+
+import 'issue_1751477_lib11.dart';
+import 'issue_1751477_lib21.dart';
+import 'issue_1751477_lib41.dart';
+import 'issue_1751477_lib51.dart';
+import 'issue_1751477_lib61.dart';
+import 'issue_1751477_lib71.dart';
+import 'issue_1751477_lib81.dart';
+import 'issue_1751477_lib91.dart';
+
+lib31_func()
+{
+}