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    use {channel};
    use std::{fmt, io, error, any};

    pub enum NotifyError<T> {
        Io(io::Error),
        Full(T),
        Closed(Option<T>),
    }

    impl<M> fmt::Debug for NotifyError<M> {
        fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
            match *self {
                NotifyError::Io(ref e) => {
                    write!(fmt, "NotifyError::Io({:?})", e)
                }
                NotifyError::Full(..) => {
                    write!(fmt, "NotifyError::Full(..)")
                }
                NotifyError::Closed(..) => {
                    write!(fmt, "NotifyError::Closed(..)")
                }
            }
        }
    }

    impl<M> fmt::Display for NotifyError<M> {
        fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
            match *self {
                NotifyError::Io(ref e) => {
                    write!(fmt, "IO error: {}", e)
                }
                NotifyError::Full(..) => write!(fmt, "Full"),
                NotifyError::Closed(..) => write!(fmt, "Closed")
            }
        }
    }

    impl<M: any::Any> error::Error for NotifyError<M> {
        fn description(&self) -> &str {
            match *self {
                NotifyError::Io(ref err) => err.description(),
                NotifyError::Closed(..) => "The receiving end has hung up",
                NotifyError::Full(..) => "Queue is full"
            }
        }

        fn cause(&self) -> Option<&error::Error> {
            match *self {
                NotifyError::Io(ref err) => Some(err),
                _ => None
            }
        }
    }

    impl<M> From<channel::TrySendError<M>> for NotifyError<M> {
        fn from(src: channel::TrySendError<M>) -> NotifyError<M> {
            match src {
                channel::TrySendError::Io(e) => NotifyError::Io(e),
                channel::TrySendError::Full(v) => NotifyError::Full(v),
                channel::TrySendError::Disconnected(v) => NotifyError::Closed(Some(v)),
            }
        }
    }

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