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header! {
    /// `From` header, defined in [RFC7231](http://tools.ietf.org/html/rfc7231#section-5.5.1)
    ///
    /// The `From` header field contains an Internet email address for a
    /// human user who controls the requesting user agent.  The address ought
    /// to be machine-usable.
    /// # ABNF
    /// ```plain
    /// From    = mailbox
    /// mailbox = <mailbox, see [RFC5322], Section 3.4>
    /// ```
    ///
    /// # Example
    /// ```
    /// use hyper::header::{Headers, From};
    ///
    /// let mut headers = Headers::new();
    /// headers.set(From("webmaster@example.org".to_owned()));
    /// ```
    // FIXME: Maybe use mailbox?
    (From, "From") => [String]

    test_from {
        test_header!(test1, vec![b"webmaster@example.org"]);
    }
}