We inline List allocations in dart2js to get the right behavior when the passed length is null. Thi…

tests/lib/mirrors/list_constructor_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 "package:expect/expect.dart";
+
+import 'dart:mirrors';
+
+main() {
+  var cls = reflectClass(List);
+  Expect.throws(() => cls.newInstance(const Symbol(''), [null]),
+                (e) => e is ArgumentError);
+
+  var list = cls.newInstance(const Symbol(''), [42]).reflectee;
+  // Check that the list is fixed.
+  Expect.equals(42, list.length);
+  Expect.throws(() => list.add(2), (e) => e is UnsupportedError);
+  list[0] = 1;
+  Expect.equals(1, list[0]);
+
+  testGrowableList(); /// 01: ok
+}
+
+testGrowableList() {
+  var cls = reflectClass(List);
+  var list = cls.newInstance(const Symbol(''), []).reflectee;
+  // Check that the list is growable.
+  Expect.equals(0, list.length);
+  list.add(42);
+  Expect.equals(1, list.length);
+}