// @dart = 2.9
library test;

class C<T> {
  T y;
  void set x(T t) {}
}

class D implements C<num> {
  num x;
  num y;
}

class E implements C<num> {
  num get y => null;
  void set x(num t) {}
  void set y(num t) {}
}

void main() {}