using System;

class A : IDisposable{
  public void Dispose(){
    Console.WriteLine("Dispose A");
    throw new Exception();
  }
}

class B : IDisposable{
  public void Dispose(){
    Console.WriteLine("Dispose B");
  }
}

class C : IDisposable{
  A a = new A();
  B b = new B();
  public void Dispose(){
    a.Dispose();
    b.Dispose();
  }
}

class D : IDisposable{
  A a = new A();
  B b = new B();
  public void Dispose(){
    using(a)
    using(b)
    {}
  }
}

class E : IDisposable{
  A a = new A();
  B b = new B();
  public void Dispose(){
    try{a.Dispose();}finally{
    try{b.Dispose();}finally{
    }
    }
  }
}

public class Test{
  public static void Main(){
    try{
      using(C c = new C()){
        Console.WriteLine("using C");
      }
    }
    catch(Exception e){Console.WriteLine("catch");}

    Console.WriteLine("------------");

    try{
      using(D d = new D()){
        Console.WriteLine("using D");
      }
    }
    catch(Exception e){Console.WriteLine("catch");}

    Console.WriteLine("------------");

    try{
      using(E e = new E()){
        Console.WriteLine("using E");
      }
    }
    catch(Exception e){Console.WriteLine("catch");}
  }
}