switch Node.bind to interop

pkg/observe/test/path_observer_test.dart

 // Copyright (c) 2013, 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.
 
 import 'dart:async';
 import 'package:observe/observe.dart';
 import 'package:unittest/unittest.dart';
 import 'observe_test_utils.dart';
 
 // This file contains code ported from:
@@ skipping 309 matching lines @@
 
   test('object with noSuchMethod', () {
     var model = new NoSuchMethodModel();
     var observer = new PathObserver(model, 'foo');
 
     expect(observer.value, 42);
     observer.value = 'hi';
     expect(model._foo, 'hi');
     expect(observer.value, 'hi');
 
-    expect(model.log, [#foo, const Symbol('foo='), #foo, #foo]);
+    expect(model.log, [#foo, const Symbol('foo='), #foo]);
 
     // These shouldn't throw
     observer = new PathObserver(model, 'bar');
     expect(observer.value, null, reason: 'path not found');
     observer.value = 42;
     expect(observer.value, null, reason: 'path not found');
   });
 
   test('object with indexer', () {
     var model = new IndexerModel();
     var observer = new PathObserver(model, 'foo');
 
     expect(observer.value, 42);
     expect(model.log, ['[] foo']);
     model.log.clear();
 
     observer.value = 'hi';
-    expect(model.log, ['[]= foo hi', '[] foo']);
+    expect(model.log, ['[]= foo hi']);
     expect(model._foo, 'hi');
 
     expect(observer.value, 'hi');
 
     // These shouldn't throw
     model.log.clear();
     observer = new PathObserver(model, 'bar');
     expect(observer.value, null, reason: 'path not found');
     expect(model.log, ['[] bar']);
     model.log.clear();
 
     observer.value = 42;
-    expect(model.log, ['[]= bar 42', '[] bar']);
+    expect(model.log, ['[]= bar 42']);
     model.log.clear();
   });
 }
 
 /// A matcher that checks that a closure throws a NoSuchMethodError matching the
 /// given [name].
 _throwsNSM(String name) => throwsA(_isNoSuchMethodOf(name));
 
 /// A matcher that checkes whether an exception is a NoSuchMethodError matching
 /// the given [name].
@@ skipping 77 matching lines @@
 
 class WatcherModel extends Observable {
   // TODO(jmesserly): dart2js does not let these be on the same line:
   // @observable var a, b, c;
   @observable var a;
   @observable var b;
   @observable var c;
 
   WatcherModel();
 }