| Index: sdk/lib/_internal/compiler/implementation/types/concrete_types_inferrer.dart
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| diff --git a/sdk/lib/_internal/compiler/implementation/types/concrete_types_inferrer.dart b/sdk/lib/_internal/compiler/implementation/types/concrete_types_inferrer.dart
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| index 54a5a689d74e93f9628310f826ba4798ee620611..92099de3ca075b4391699b1ddd6f72b1d9c7087e 100644
 | 
| --- a/sdk/lib/_internal/compiler/implementation/types/concrete_types_inferrer.dart
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| +++ b/sdk/lib/_internal/compiler/implementation/types/concrete_types_inferrer.dart
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| @@ -1183,7 +1183,7 @@ class ConcreteTypesInferrer extends TypesInferrer {
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|          compiler.listClass.lookupConstructor(
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|              new Selector.callConstructor(const SourceString(''),
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|                                           compiler.listClass.getLibrary()));
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| -    nullTypeMask = new TypeMask.exact(compiler.nullClass.computeType(compiler));
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| +    nullTypeMask = new TypeMask.empty();
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|    }
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|  
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|    /**
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| 
 |