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/// Extracts the successful type of a `Poll<T>`.
///
/// This macro bakes in propagation of `Pending` signals by returning early.
#[macro_export]
macro_rules! ready {
    ($e:expr) => (match $e {
        $crate::core_reexport::task::Poll::Ready(t) => t,
        $crate::core_reexport::task::Poll::Pending =>
            return $crate::core_reexport::task::Poll::Pending,
    })
}