Generate artificial hashCode for often used classes.

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 10060 matching lines @@
  * some (possibly different) library. They are not intended to be used except
  * during the resolution process.
  */
 class ResolvableLibrary {
   /**
    * An empty array that can be used to initialize lists of libraries.
    */
   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++;
+
+  /**
    * 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 99 matching lines @@
     this._exportedLibraries = exportedLibraries;
   }
 
   /**
    * Return an array containing the libraries that are exported from this library.
    *
    * @return an array containing the libraries that are exported from this library
    */
   List<ResolvableLibrary> get exports => _exportedLibraries;
 
+  @override
+  int get hashCode => _hashCode;
+
   /**
    * Set the libraries that are imported into this library to be those in the given array.
    *
    * @param importedLibraries the libraries that are imported into this library
    */
   void set importedLibraries(List<ResolvableLibrary> importedLibraries) {
     this._importedLibraries = importedLibraries;
   }
 
   /**
@@ skipping 5464 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>();
 }