When in-body incremantal resolution is performed, it should update REFERENCED_NAMES.

pkg/analyzer/test/src/context/context_test.dart

 // Copyright (c) 2014, 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.context.context_test;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 3085 matching lines @@
     _assertValidForChangedLibrary(a);
     _assertInvalid(a, LIBRARY_ERRORS_READY);
     _assertValidForDependentLibrary(b);
     _assertInvalid(b, LIBRARY_ERRORS_READY);
     _assertInvalidUnits(b, RESOLVED_UNIT4);
     // Now b.dart is analyzed and it again has the error.
     _performPendingAnalysisTasks();
     expect(context.getErrors(b).errors, hasLength(1));
   }
 
+  void test_sequence_inBodyChange_deltaChange() {

[Brian Wilkerson, 2016/07/07 20:58:41]

This will test that the newly referenced name gets added. Do we have tests that
a newly no-longer-referenced identifier will be removed correctly?

[scheglov, 2016/07/07 21:02:45]

Good idea, thank you.
I've added a new test for this case.

+    Source a = addSource(
+        '/a.dart',
+        r'''
+class A {
+}
+''');
+    Source b = addSource(
+        '/b.dart',
+        r'''
+import 'a.dart';
+main(A a) {
+}
+''');
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(b).errors, hasLength(0));
+    // Update b.dart: in-body incremental change
+    //   Should update referenced names.
+    context.setContents(
+        b,
+        r'''
+import 'a.dart';
+main(A a) {
+  a.foo;
+}
+''');
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(b).errors, hasLength(1));
+    // Update a.dart: add A.foo
+    //   b.dart is invalid, because it references 'foo'.
+    context.setContents(
+        a,
+        r'''
+class A {
+  int foo;
+}
+''');
+    _assertValidForChangedLibrary(a);
+    _assertInvalid(a, LIBRARY_ERRORS_READY);
+    _assertValidForDependentLibrary(b);
+    _assertInvalid(b, LIBRARY_ERRORS_READY);
+    _assertInvalidUnits(b, RESOLVED_UNIT4);
+    // No errors after analysis.
+    _performPendingAnalysisTasks();
+    expect(context.getErrors(b).errors, hasLength(0));
+  }
+
   void test_sequence_noChange_thenChange() {
     Source a = addSource(
         '/a.dart',
         r'''
 class A {
   A();
 }
 
 class B {
   B();
@@ skipping 625 matching lines @@
    * Initialize the visitor.
    */
   _ElementGatherer();
 
   @override
   void visitElement(Element element) {
     elements[element] = element;
     super.visitElement(element);
   }
 }