Issue 27689. Fix incremental resolution with body modifiers changes.

pkg/analyzer/test/src/task/incremental_element_builder_test.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.test.src.task.incremental_element_builder_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
@@ skipping 693 matching lines @@
     expect(helper.element.methods, [newElementA, elementB]);
     // verify delta
     expect(helper.delta.addedConstructors, isEmpty);
     expect(helper.delta.removedConstructors, isEmpty);
     expect(helper.delta.addedAccessors, isEmpty);
     expect(helper.delta.removedAccessors, isEmpty);
     expect(helper.delta.addedMethods, unorderedEquals([newElementA]));
     expect(helper.delta.removedMethods, unorderedEquals([oldElementA]));
   }
 
+  solo_test_classDelta_method_async_addStar() {

[Brian Wilkerson, 2016/11/14 18:17:43]

Remove "solo_".

+    var helper = new _ClassDeltaHelper('A');
+    _buildOldUnit(r'''
+class A {
+  Stream test() async {}
+}
+''');
+    helper.initOld(oldUnit);
+    _buildNewUnit(r'''
+class A {
+  Stream test() async* {}
+}
+''');
+    helper.initNew(newUnit, unitDelta);
+    // nodes
+    ClassMember oldNodeA = helper.oldMembers[0];
+    ClassMember newNodeA = helper.newMembers[0];
+    expect(newNodeA, isNot(same(oldNodeA)));
+    // elements
+    MethodElement oldElement = oldNodeA.element;
+    MethodElement newElement = newNodeA.element;
+    expect(newElement, isNotNull);
+    expect(newElement.name, 'test');
+    expect(oldElement.isAsynchronous, isTrue);
+    expect(oldElement.isGenerator, isFalse);
+    expect(newElement.isAsynchronous, isTrue);
+    expect(newElement.isGenerator, isTrue);
+    expect(helper.element.methods, [newElement]);
+    // verify delta
+    expect(helper.delta.addedConstructors, isEmpty);
+    expect(helper.delta.removedConstructors, isEmpty);
+    expect(helper.delta.addedAccessors, isEmpty);
+    expect(helper.delta.removedAccessors, isEmpty);
+    expect(helper.delta.addedMethods, unorderedEquals([newElement]));
+    expect(helper.delta.removedMethods, unorderedEquals([oldElement]));
+  }
+
   test_classDelta_method_changeName() {
     var helper = new _ClassDeltaHelper('A');
     _buildOldUnit(r'''
 class A {
   aaa(int ap) {
     int av = 1;
     af(afp) {}
   }
   bbb(int bp) {
     int bv = 1;
@@ skipping 1579 matching lines @@
           unitMember is ClassDeclaration && unitMember.name.name == name);
 }
 
 class _MaterializeLazyElementsVisitor extends GeneralizingElementVisitor {
   @override
   visitExecutableElement(ExecutableElement element) {
     element.parameters;
     super.visitExecutableElement(element);
   }
 }