using System;
using System.Collections;
using System.Collections.Generic;

class D
{
	static void Main()
	{
		Console.WriteLine(new D() == (Action)null); // error CS0019: Operator '==' cannot be applied to operands of type 'D' and 'System.Action'
	}

	public static implicit operator D(Action x)
	{
		return null;
	}
}