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