| Index: pkg/analyzer/lib/src/generated/type_system.dart
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| diff --git a/pkg/analyzer/lib/src/generated/type_system.dart b/pkg/analyzer/lib/src/generated/type_system.dart
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| index ed117afc63938a632ccaf1cd4f18d1bdd1d801e2..93dda91c0b7731ea8d5c7dff0bd8e6e6dbf572ff 100644
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| --- a/pkg/analyzer/lib/src/generated/type_system.dart
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| +++ b/pkg/analyzer/lib/src/generated/type_system.dart
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| @@ -24,7 +24,7 @@ import 'package:analyzer/src/generated/utilities_general.dart'
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|      show JenkinsSmiHash;
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|  
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|  bool _isBottom(DartType t, {bool dynamicIsBottom: false}) {
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| -  return (t.isDynamic && dynamicIsBottom) || t.isBottom;
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| +  return (t.isDynamic && dynamicIsBottom) || t.isBottom || t.isDartCoreNull;
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|  }
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|  
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|  bool _isTop(DartType t, {bool dynamicIsBottom: false}) {
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| 
 |