protected override int ReadWorker(SymbolKeyType type)
            {
                switch (type)
                {
                case SymbolKeyType.Alias: return(AliasSymbolKey.GetHashCode(this));

                case SymbolKeyType.BodyLevel: return(BodyLevelSymbolKey.GetHashCode(this));

                case SymbolKeyType.ConstructedMethod: return(ConstructedMethodSymbolKey.GetHashCode(this));

                case SymbolKeyType.NamedType: return(NamedTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.ErrorType: return(ErrorTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.Field: return(FieldSymbolKey.GetHashCode(this));

                case SymbolKeyType.DynamicType: return(DynamicTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.Method: return(MethodSymbolKey.GetHashCode(this));

                case SymbolKeyType.Namespace: return(NamespaceSymbolKey.GetHashCode(this));

                case SymbolKeyType.PointerType: return(PointerTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.Parameter: return(ParameterSymbolKey.GetHashCode(this));

                case SymbolKeyType.Property: return(PropertySymbolKey.GetHashCode(this));

                case SymbolKeyType.ArrayType: return(ArrayTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.Assembly: return(AssemblySymbolKey.GetHashCode(this));

                case SymbolKeyType.TupleType: return(TupleTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.Module: return(ModuleSymbolKey.GetHashCode(this));

                case SymbolKeyType.Event: return(EventSymbolKey.GetHashCode(this));

                case SymbolKeyType.ReducedExtensionMethod: return(ReducedExtensionMethodSymbolKey.GetHashCode(this));

                case SymbolKeyType.TypeParameter: return(TypeParameterSymbolKey.GetHashCode(this));

                case SymbolKeyType.AnonymousType: return(AnonymousTypeSymbolKey.GetHashCode(this));

                case SymbolKeyType.TypeParameterOrdinal: return(TypeParameterOrdinalSymbolKey.GetHashCode(this));
                }

                throw new NotImplementedException();
            }