public static void DoSomething<TFoo>(this TFoo foo) where TFoo : IFoo<IChild>
{
IFoo<IChild> bar = foo;
//Added by Ashwani
((IFoo<IChild>)foo).DoSomethingElse();//Will Complie
foo.DoSomethingElseTotally(); //Will Complie
//foo.DoSomethingElse(); // Doesn't compile -- why not?
bar.DoSomethingElse(); // OK
DoSomethingElse(foo); // Also OK!
}