Issue 27689. Fix incremental resolution with body modifiers changes.

pkg/analyzer/test/src/task/incremental_element_builder_test.dart

Index: pkg/analyzer/test/src/task/incremental_element_builder_test.dart
diff --git a/pkg/analyzer/test/src/task/incremental_element_builder_test.dart b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
index 7147906dcc36794c09da38e490ee5e76a8cd0e30..cf154c95649b72352d1ae795df89355eeb97a838 100644
--- a/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
+++ b/pkg/analyzer/test/src/task/incremental_element_builder_test.dart
@@ -711,6 +711,43 @@ class A {
     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'''