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    use core::fmt::{self, Display, Debug};

    use Fail;
    use Error;

    /// Constructs a `Fail` type from a string.
    ///
    /// This is a convenient way to turn a string into an error value that
    /// can be passed around, if you do not want to create a new `Fail` type for
    /// this use case.
    pub fn err_msg<D: Display + Debug + Sync + Send + 'static>(msg: D) -> Error {
        Error::from(ErrorMessage { msg })
    }

    /// A `Fail` type that just contains an error message. You can construct
    /// this from the `err_msg` function.
    #[derive(Debug)]
    struct ErrorMessage<D: Display + Debug + Sync + Send + 'static> {
        msg: D,
    }

    impl<D: Display + Debug + Sync + Send + 'static> Fail for ErrorMessage<D> { }

    impl<D: Display + Debug + Sync + Send + 'static> Display for ErrorMessage<D> {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            Display::fmt(&self.msg, f)
        }
    }

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