Add Vector type to Kernel

pkg/kernel/lib/transformations/closure/mock.dart

 // Copyright (c) 2016, 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 kernel.transformations.closure.mock;
 
 import '../../ast.dart'
     show
         Arguments,
         Block,
@@ skipping 29 matching lines @@
 import '../../core_types.dart' show CoreTypes;
 
 import '../../frontend/accessors.dart'
     show
         Accessor,
         IndexAccessor,
         PropertyAccessor,
         ThisPropertyAccessor,
         VariableAccessor;
 
+/// TODO(dmitryas): make the "[]=" operator return the value.
 /// Extend the program with this mock:
 ///
 ///     class Context {
 ///       final List list;
 ///       var parent;
 ///       Context(int i) : list = new List(i);
 ///       operator[] (int i) => list[i];
 ///       operator[]= (int i, value) {
 ///         list[i] = value;
 ///       }
@@ skipping 127 matching lines @@
       fields: fields,
       procedures: procedures,
       fileUri: fileUri);
   Library mock = new Library(Uri.parse(fileUri),
       name: "mock", classes: [contextClass])..fileUri = fileUri;
   program.libraries.add(mock);
   mock.parent = program;
   program.uriToSource[mock.fileUri] = new Source(<int>[0], const <int>[]);
   return contextClass;
 }