Verifying Method return value on async methods

[JanSdot]

Maybe I just don't know how to do it, but for me it seems that it is right now not possible to verify return parameters of a method, if that method is async, so actually return a Task<TReturn> where there Return is what you actually want to check.

It would be great if this would be added or a hint how this could be accomplished!

Great framework by the way!