| Index: tests/compiler/dart2js/container_mask_equal_test.dart | 
| diff --git a/tests/compiler/dart2js/container_mask_equal_test.dart b/tests/compiler/dart2js/container_mask_equal_test.dart | 
| index e56167b4c82c1df45d2bdbda70a081107f99deb4..1d6a92e63ed074321b7d843e54f050103ce7653c 100644 | 
| --- a/tests/compiler/dart2js/container_mask_equal_test.dart | 
| +++ b/tests/compiler/dart2js/container_mask_equal_test.dart | 
| @@ -44,7 +44,7 @@ main() { | 
| element = compiler.mainApp.find('d'); | 
| var mask4 = typesInferrer.getReturnTypeOfElement(element); | 
|  | 
| -    Expect.notEquals(mask1.union(mask2, compiler.world), | 
| -                     mask3.union(mask4, compiler.world)); | 
| +    Expect.notEquals(mask1.union(mask2, compiler.closedWorld), | 
| +                     mask3.union(mask4, compiler.closedWorld)); | 
| }); | 
| } | 
|  |