gistfile1.txt

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Threading.Tasks;



class A : IAsyncResult

{

	#region IAsyncResult implementation

	public object AsyncState {

		get {

			throw new NotImplementedException ();

		}

	}



	public System.Threading.WaitHandle AsyncWaitHandle {

		get {

			throw new NotImplementedException ();

		}

	}



	public bool CompletedSynchronously {

		get {

			throw new NotImplementedException ();

		}

	}



	public bool IsCompleted {

		get {

			throw new NotImplementedException ();

		}

	}

	#endregion

}



class C

{

	public static void Main ()

	{

		var f = new TaskFactory<int> ();

		f.FromAsync (new A (), null);

		

		return;

	}

}