构造函数速记中必需的命名参数

Question

如何修复

// Inside the class Bicycle
Bicycle({@required int this.cadence, @required int this.speed, \
          @required int this.gear});

是否可以将整个命名参数集标记为@required？还是其他选择？

Bicycle(@required {int this.cadence, int this.speed, int this.gear});

我是飞镖新手。