| Index: pkg/serialization/lib/src/basic_rule.dart
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| diff --git a/pkg/serialization/lib/src/basic_rule.dart b/pkg/serialization/lib/src/basic_rule.dart
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| index 303a9e1a04a23f0b2c2a3d0da3f6ebbf2b7746a4..19a8bcab3c63f059edae35a827df76855c1c1d04 100644
 | 
| --- a/pkg/serialization/lib/src/basic_rule.dart
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| +++ b/pkg/serialization/lib/src/basic_rule.dart
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| @@ -271,7 +271,7 @@ class BasicRule extends SerializationRule {
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|   * This represents a field in an object. It is intended to be used as part of
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|   * a [_FieldList].
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|   */
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| -abstract class _Field implements Comparable {
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| +abstract class _Field implements Comparable<_Field> {
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|  
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|    /** The FieldList that contains us. */
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|    final _FieldList fieldList;
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| 
 |