gistfile1.txt

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

interface IMethod
{
}

class C
{
	public IEnumerable<IEnumerable<IMethod>> GetExtensionMethods()
	{
		List<List<IMethod>> extensionMethods = null;
		return extensionMethods ?? Enumerable.Empty<IEnumerable<IMethod>>();
	}
	
	public static void Main ()
	{
	}
}