Mask ResolvableLibrary hashCode.

pkg/analyzer/lib/src/generated/resolver.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 engine.resolver;
 
 import "dart:math" as math;
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/utilities_collection.dart';
@@ skipping 10067 matching lines @@
   static List<ResolvableLibrary> _EMPTY_ARRAY = new List<ResolvableLibrary>(0);
 
   /**
    * The next artificial hash code.
    */
   static int _NEXT_HASH_CODE = 0;
 
   /**
    * The artifitial hash code for this object.
    */
-  final int _hashCode = _NEXT_HASH_CODE++;
+  final int _hashCode = _nextHashCode();
 
   /**
    * The source specifying the defining compilation unit of this library.
    */
   final Source librarySource;
 
   /**
    * A list containing all of the libraries that are imported into this library.
    */
   List<ResolvableLibrary> _importedLibraries = _EMPTY_ARRAY;
@@ skipping 219 matching lines @@
     for (int i = 0; i < count; i++) {
       if (_compilationUnits[i].source == source) {
         return _compilationUnits[i].compilationUnit;
       }
     }
     return null;
   }
 
   @override
   String toString() => librarySource.shortName;
+
+  static int _nextHashCode() {
+    int next = (_NEXT_HASH_CODE + 1) & 0xFFFFFF;
+    _NEXT_HASH_CODE = next;
+    return next;
+  }
 }
 
 /**
  * The enumeration `ResolverErrorCode` defines the error codes used for errors
  * detected by the resolver. The convention for this class is for the name of
  * the error code to indicate the problem that caused the error to be generated
  * and for the error message to explain what is wrong and, when appropriate, how
  * the problem can be corrected.
  */
 class ResolverErrorCode extends ErrorCode {
@@ skipping 5349 matching lines @@
    * library.
    */
   final HashSet<String> members = new HashSet<String>();
 
   /**
    * Names of resolved or unresolved class members that are read in the
    * library.
    */
   final HashSet<String> readMembers = new HashSet<String>();
 }