Handle instance methods.

dart/tests/try/web/incremental_compilation_update_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 trydart.incremental_compilation_update_test;
 
 import 'dart:html';
 
 import 'dart:async' show
     Future;
@@ skipping 141 matching lines @@
   }
 }
 var instance;
 main() {
   if (instance == null) {
     instance = new C();
   }
   instance.m();
 }
 """,
-            // TODO(ahe): This test is failing, should print "v2".
+            const <String> ['v2']),
+    ],
+
+    // Test that a stored instance tearoff changes behavior when updated.
+    const <ProgramResult>[
+        const ProgramResult(
+            """
+class C {
+  m() {
+    print('v1');
+  }
+}
+var closure;
+main() {
+  if (closure == null) {
+    closure = new C().m;
+  }
+  closure();
+}
+""",
             const <String> ['v1']),
+        const ProgramResult(
+            """
+class C {
+  m() {
+    print('v2');
+  }
+}
+var closure;
+main() {
+  if (closure == null) {
+    closure = new C().m;
+  }
+  closure();
+}
+""",
+            const <String> ['v2']),
     ],
 ];
 
 void main() {
   listener.start();
 
   return asyncTest(() => Future.forEach(tests, compileAndRun));
 }
 
 Future compileAndRun(List<ProgramResult> programs) {
@@ skipping 52 matching lines @@
 
 void logger(x) {
   print(x);
   bool isCheckedMode = false;
   assert(isCheckedMode = true);
   int timeout = isCheckedMode ? TIMEOUT * 2 : TIMEOUT;
   if (listener.elapsed > timeout) {
     throw 'Test timed out.';
   }
 }