Is it possible to make WP7 Beta compile code with Tuples?

When I开发者_如何学Python use Tuples, compile breaks. Anybody knows if it possible to use Tuples within WP7 without re-implementing?

There are quite a number of types and methods in .NET 4 and Silverlight 4 that do not appear in WP7's framework, including Tuple. That said, Tuple shouldn't be all that hard to implement.