Implement hashCode for classes with equals().

pkg/analyzer/lib/src/generated/element.dart

 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.element;
 
 import 'dart:collection';
 import 'java_core.dart';
 import 'java_engine.dart';
 import 'utilities_collection.dart';
 import 'source.dart';
@@ skipping 5066 matching lines @@
     return ElementKind.SETTER;
   }
 
   String get name {
     if (isSetter) {
       return "${super.name}=";
     }
     return super.name;
   }
 
+  int get hashCode => ObjectUtilities.combineHashCodes(super.hashCode, isGetter ? 1 : 2);
+
   bool get isAbstract => hasModifier(Modifier.ABSTRACT);
 
   bool get isGetter => hasModifier(Modifier.GETTER);
 
   bool get isSetter => hasModifier(Modifier.SETTER);
 
   bool get isStatic => hasModifier(Modifier.STATIC);
 
   /**
    * Set whether this accessor is abstract to correspond to the given value.
@@ skipping 987 matching lines @@
    */
   static BottomTypeImpl get instance => _INSTANCE;
 
   /**
    * Prevent the creation of instances of this class.
    */
   BottomTypeImpl() : super(null, "<bottom>");
 
   bool operator ==(Object object) => identical(object, this);
 
+  int get hashCode => 0;
+
   bool get isBottom => true;
 
   bool isSupertypeOf(Type2 type) => false;
 
   BottomTypeImpl substitute2(List<Type2> argumentTypes, List<Type2> parameterTypes) => this;
 
   bool internalIsMoreSpecificThan(Type2 type, bool withDynamic, Set<TypeImpl_TypePair> visitedTypePairs) => true;
 
   bool internalIsSubtypeOf(Type2 type, Set<TypeImpl_TypePair> visitedTypePairs) => true;
 }
@@ skipping 16 matching lines @@
    */
   static DynamicTypeImpl get instance => _INSTANCE;
 
   /**
    * Prevent the creation of instances of this class.
    */
   DynamicTypeImpl() : super(new DynamicElementImpl(), Keyword.DYNAMIC.syntax) {
     (element as DynamicElementImpl).type = this;
   }
 
-  bool operator ==(Object object) => object is DynamicTypeImpl;
+  bool operator ==(Object object) => identical(object, this);
+
+  int get hashCode => 0;
 
   bool get isDynamic => true;
 
   bool isSupertypeOf(Type2 type) => true;
 
   Type2 substitute2(List<Type2> argumentTypes, List<Type2> parameterTypes) {
     int length = parameterTypes.length;
     for (int i = 0; i < length; i++) {
       if (parameterTypes[i] == this) {
         return argumentTypes[i];
@@ skipping 1461 matching lines @@
    */
   static VoidTypeImpl get instance => _INSTANCE;
 
   /**
    * Prevent the creation of instances of this class.
    */
   VoidTypeImpl() : super(null, Keyword.VOID.syntax);
 
   bool operator ==(Object object) => identical(object, this);
 
+  int get hashCode => 0;
+
   bool get isVoid => true;
 
   VoidTypeImpl substitute2(List<Type2> argumentTypes, List<Type2> parameterTypes) => this;
 
   bool internalIsMoreSpecificThan(Type2 type, bool withDynamic, Set<TypeImpl_TypePair> visitedTypePairs) => isSubtypeOf(type);
 
   bool internalIsSubtypeOf(Type2 type, Set<TypeImpl_TypePair> visitedTypePairs) => identical(type, this) || identical(type, DynamicTypeImpl.instance);
 }
 
 /**
@@ skipping 605 matching lines @@
 
 /**
  * The interface `VoidType` defines the behavior of the unique object representing the type
  * `void`.
  *
  * @coverage dart.engine.type
  */
 abstract class VoidType implements Type2 {
   VoidType substitute2(List<Type2> argumentTypes, List<Type2> parameterTypes);
 }