Add missing functions to ListMixin.

tests/corelib/iterable_expand_test.dart

Index: tests/corelib/iterable_expand_test.dart
diff --git a/tests/corelib/iterable_expand_test.dart b/tests/corelib/iterable_expand_test.dart
index 5737a9b24cab8305605dcbc02a879f23ab0fe6d1..9c60541f2f41523200972ef83f8ecd1337e06204 100644
--- a/tests/corelib/iterable_expand_test.dart
+++ b/tests/corelib/iterable_expand_test.dart
@@ -3,6 +3,21 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import "package:expect/expect.dart";
+import 'dart:collection';
+
+class MyList extends ListBase {
+  List list;
+  MyList(this.list);
+
+  get length => list.length;
+  set length(val) { list.length = val; }
+
+  operator [](index) => list[index];
+  operator []=(index, val) => list[index] = val;
+
+  String toString() => "[" + join(", ") + "]";
+}
+
 
 main() {
   test(expectation, iterable) {
@@ -25,6 +40,16 @@ main() {
   test([1, 1, 2, 2, 3, 3], [1, 2, 3].expand((x) => [x, x]));
   test([1, 1, 2], [1, 2, 3].expand((x) => [x, x, x].skip(x)));
 
+  test([1], new MyList([1]).expand((x) => [x]));
+  test([1, 2, 3], new MyList([1, 2, 3]).expand((x) => [x]));
+
+  test([], new MyList([1]).expand((x) => []));
+  test([], new MyList([1, 2, 3]).expand((x) => []));
+  test([2], new MyList([1, 2, 3]).expand((x) => x == 2 ? [2] : []));
+
+  test([1, 1, 2, 2, 3, 3], new MyList([1, 2, 3]).expand((x) => [x, x]));
+  test([1, 1, 2], new MyList([1, 2, 3]).expand((x) => [x, x, x].skip(x)));
+
   // if function throws, iteration is stopped.
   Iterable iterable = [1, 2, 3].expand((x) {
     if (x == 2) throw "FAIL";