gistfile1.txt

using System;

interface IExplicit {
	void M ();
}

interface IImplicit : IExplicit {
}

class C1 : IImplicit {
	public void M ()
	{
		Console.WriteLine ("C1.M");
	}
}

class C2 : C1, IImplicit {
	public void M ()
	{
		Console.WriteLine ("C2.M");
	}
}

class F{
	static void Main ()
	{
		var c = new C2 ();
		IExplicit ie = c;

		c.M ();
		ie.M ();
	}
}