Implement `.instanceMembers`.

reflectable/lib/src/mirrors_unimpl.dart

 // Copyright (c) 2015, the Dart Team. All rights reserved. Use of this
 // source code is governed by a BSD-style license that can be found in
 // the LICENSE file.
 
 import '../mirrors.dart';
 import 'encoding_constants.dart' as constants;
 import '../capability.dart';
 export 'dart:collection' show UnmodifiableMapView, UnmodifiableListView;
 export '../capability.dart';
 export '../static_reflectable.dart';
@@ skipping 162 matching lines @@
   @override
   final DeclarationMirror owner;
 
   const MethodMirrorImpl(this.name, this.descriptor, this.owner);
 
   int get kind => constants.kindFromEncoding(descriptor);
 
   @override
   String get constructorName => name;
 
+  // We do not support reflection on abstract methods.
   @override
-  bool get isAbstract => 0 != descriptor & constants.abstractAttribute;
+  bool get isAbstract => 0 !=  descriptor & constants.abstractAttribute;
 
   @override
   bool get isConstConstructor => 0 != descriptor & constants.constAttribute;
 
   @override
   bool get isConstructor => isFactoryConstructor || isGenerativeConstructor;
 
   @override
   bool get isFactoryConstructor => kind == constants.factoryConstructor;
 
@@ skipping 74 matching lines @@
   bool get isNamed => _unsupported();
   bool get hasDefaultValue => _unsupported();
   Object get defaultValue => _unsupported();
 }
 
 abstract class SourceLocationUnimpl {
   int get line => _unsupported();
   int get column => _unsupported();
   Uri get sourceUri => _unsupported();
 }