anchor.diff:    @override
     void visitSwitchCase(SwitchCase node) {
       _visitChildren(node, {
  +      'labels': node.labels,
         'expression': node.expression,
         'statements': node.statements,
       });
  
positive.code:   @override
    void visitClassTypeAlias(ClassTypeAlias node) {
      _visitChildren(node, {
        'abstractKeyword': node.abstractKeyword,
        'name': node.name,
        'typeParameters': node.typeParameters,
  
negative.code:       'documentationComment': node.documentationComment,
        'metadata': node.metadata,
        'name': node.name,
        'typeParameters': node.typeParameters,
        'onClause': node.onClause,
        'implementsClause': node.implementsClause,
        'members': node.members,
  