class A {
  int field;
  A(this.field);
}

class B implements A {
  set field ()= ;
  0;
  get field => 0;
}

class C implements A {
  set field() {}
  get field() => 0;
}

class D implements A {
  set field(a, b) {}
  get field(a, b) => 0;
}

class E implements A {
  set field([a]) {}
  get field([a]) => 0;
}

class F implements A {
  set field({a}) {}
  get field({a}) => 0;
}

class G implements A {
  set field (){}
  get field(a) => 0;
}