library test;

int getInt() => 0;
num getNum() => 0;
double getDouble() => 0.0;

abstract class Test1 {
  int operator [](String s);
  void operator []=(String s, int v);
  void test() {}
}

abstract class Test2 {
  int operator [](String s);
  void operator []=(String s, num v);
  void test() {}
}

abstract class Test3 {
  int operator [](String s);
  void operator []=(String s, double v);
  void test() {}
}

abstract class Test4 {
  num operator [](String s);
  void operator []=(String s, int v);
  void test() {}
}

abstract class Test5 {
  num operator [](String s);
  void operator []=(String s, num v);
  void test() {}
}

abstract class Test6 {
  num operator [](String s);
  void operator []=(String s, double v);
  void test() {}
}

abstract class Test7 {
  double operator [](String s);
  void operator []=(String s, int v);
  void test() {}
}

abstract class Test8 {
  double operator [](String s);
  void operator []=(String s, num v);
  void test() {}
}

abstract class Test9 {
  double operator [](String s);
  void operator []=(String s, double v);
  void test() {}
}

main() {}