Futures

coroutine_trait.rs

impl<A,Y,R,F> Coroutine<A> for F where F: FnMut(A) -> CoResult<Y,R> {
    type Yield = Y;
    type Return = R;
    fn call(&mut self, a: A) -> CoResult<Self::Yield, Self::Return> {
        self(a)
    }
}