Trait Pair
eventual
pub trait Pair { type Tx; fn pair() -> (Self::Tx, Self); }
type Tx
fn pair() -> (Self::Tx, Self)
impl<T: Send + 'static, E: Send + 'static> Pair for Future<T, E>
impl<T: Send + 'static, E: Send + 'static> Pair for Stream<T, E>