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tokio 0.2.19

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications.
Documentation 
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macro_rules! ready {
    ($e:expr $(,)?) => {
        match $e {
            std::task::Poll::Ready(t) => t,
            std::task::Poll::Pending => return std::task::Poll::Pending,
        }
    };
}