| Index: pkg/analyzer/lib/src/generated/resolver.dart | 
| diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart | 
| index b3b6594e17c4f6e16b3df4a90539863b729e108f..16b6afa974ed12a0bd360f05da11ca55ff109563 100644 | 
| --- a/pkg/analyzer/lib/src/generated/resolver.dart | 
| +++ b/pkg/analyzer/lib/src/generated/resolver.dart | 
| @@ -5156,8 +5156,8 @@ class ImplicitConstructorBuilder extends SimpleElementVisitor { | 
| ImplicitConstructorBuilder(this.errorListener, this._callback); | 
|  | 
| @override | 
| -  void visitClassElement(ClassElementImpl classElement) { | 
| -    classElement.mixinErrorsReported = false; | 
| +  void visitClassElement(ClassElement classElement) { | 
| +    (classElement as ClassElementImpl).mixinErrorsReported = false; | 
| if (classElement.isTypedef) { | 
| _visitClassTypeAlias(classElement); | 
| } else { | 
|  |