Cannot access inherited property on derived interface

[jayrulez]

interface IParent
{
	bool IsEnabled {get; set;}
}

interface IChild : IParent
{
}

class Implementation : IChild{
	public bool IsEnabled {get; set;}
}

class Program 
{
	public static void Main()
	{
		IChild c = scope Implementation();
		var enabled = c.IsEnabled;
	}
}

A compiler error is reported by the line: var enabled = c.IsEnabled;