// @dart = 2.6
class DynamicClass<T extends dynamic, S extends T> {
  DynamicClass(this.field1, this.field2);
  T field1;
  T field2;
  method() => field1 * field2;
}

class NumClass<T extends num, S extends T> {
  NumClass(this.field1, this.field2);
  S field2;
  T field1;
  num method1() => field1 * field2;
  num method2() => field1 + field2.length;
}

main() {}