using System;

public struct KeyValuePair[K,V]
{
  public this (_k : K, _v :  V)
  { }

  public this (_k : K)
  { }
}

class X
{
  static Main () :  void
  {
     _ = KeyValuePair.[int, string] ();
  }
}
/*
BEGIN-OUTPUT
END-OUTPUT
*/