| Index: tests/compiler/dart2js/union_type_test.dart
 | 
| diff --git a/tests/compiler/dart2js/union_type_test.dart b/tests/compiler/dart2js/union_type_test.dart
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| index 4ae2dac475ca8311fb8930621ab6fda7cf704c32..3b6a6b810ec07888b78bfab78e4591b365309a54 100644
 | 
| --- a/tests/compiler/dart2js/union_type_test.dart
 | 
| +++ b/tests/compiler/dart2js/union_type_test.dart
 | 
| @@ -22,7 +22,7 @@ main() {
 | 
|        }
 | 
|        """,
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|        useMockCompiler: false);
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| -    World world = env.compiler.world;
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| +    World world = env.compiler.closedWorld;
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|      world.populate();
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|      FlatTypeMask mask1 = new FlatTypeMask.exact(env.getElement('A'));
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|      FlatTypeMask mask2 = new FlatTypeMask.exact(env.getElement('B'));
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| 
 |