失败原因:状态错误:没有用于BuiltList的生成器工厂

import 'package:built_collection/built_collection.dart';
import 'package:built_value/built_value.dart';

abstract class MyModel implements Built<MyModel, MyModelBuilder> {
  // 定义模型的属性和方法

  // 为BuiltList提供生成器工厂
  factory MyModel([void Function(MyModelBuilder) updates]) = _$MyModel;
  MyModel._();
}

flutter packages pub run build_runner build

var myList = BuiltList<int>.build((b) => b..addAll([1, 2, 3]));