Rename ContributionPoint and error result

pkg/analyzer/lib/task/model.dart

 // Copyright (c) 2015, 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 analyzer.task.model;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisTask;
 import 'package:analyzer/src/generated/java_engine.dart';
@@ skipping 209 matching lines @@
     }
   }
 }
 
 /**
  * A [ResultDescriptor] that denotes an analysis result that is a union of
  * one or more other results.
  *
  * Clients are not expected to subtype this class.
  */
-abstract class ContributionPoint<V> extends ResultDescriptor<V> {
+abstract class CompositeResultDescriptor<V> extends ResultDescriptor<V> {
   /**
-   * Initialize a newly created contribution point to have the given [name].
+   * Initialize a newly created composite result to have the given [name].
    */
-  factory ContributionPoint(String name) = ContributionPointImpl;
+  factory CompositeResultDescriptor(
+      String name) = CompositeResultDescriptorImpl;
 
   /**
    * Return a list containing the descriptors of the results that are unioned
-   * together to comprise the value of this result.
+   * together to compose the value of this result.
    *
    * Clients must not modify the returned list.
    */
   List<ResultDescriptor<V>> get contributors;
 }
 
 /**
  * A description of an analysis result that can be computed by an [AnalysisTask].
  *
  * Clients are not expected to subtype this class.
  */
 abstract class ResultDescriptor<V> {
   /**
    * Initialize a newly created analysis result to have the given [name]. If a
-   * contribution point is specified, then this result will contribute to it.
+   * composite result is specified, then this result will contribute to it.
    */
   factory ResultDescriptor(String name, V defaultValue,
-      {ContributionPoint<V> contributesTo}) = ResultDescriptorImpl;
+      {CompositeResultDescriptor<V> contributesTo}) = ResultDescriptorImpl;
 
   /**
    * Return the default value for results described by this descriptor.
    */
   V get defaultValue;
 
   /**
    * Return the name of this descriptor.
    */
   String get name;
@@ skipping 106 matching lines @@
    * be computed, or `false` if the inputs have been computed.
    *
    * It is safe to invoke [moveNext] after it has returned `false`. In this case
    * [moveNext] has no effect and will again return `false`.
    *
    * Throws a [StateError] if the value of the current result has not been
    * provided using [currentValue].
    */
   bool moveNext();
 }