fixes #175, fixed arrays

test/browser/runtime_tests.js

 // Copyright (c) 2015, 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.
 
 var assert = chai.assert;
 
 suite('generic', () => {
   "use strict";
 
   let generic = dart.generic;
@@ skipping 373 matching lines @@
     let n = 42;
     let intHash = dart.hashCode(n);
     checkType(intHash, core.int);
 
     let intString = dart.toString(n);
     assert.equal(intString, '42');
     let intType = dart.runtimeType(n);
     assert.equal(intType, core.int);
   });
 });
+
+suite('primitives', function() {
+  'use strict';
+
+  test('fixed length list', () => {
+    let list = new core.List(10);
+    list[0] = 42;
+    assert.throws(() => list.add(42));
+  });
+});