Function parse_contact 

pub fn parse_contact<T>(contact: &T) -> Result<Contact>
where
    T: AsRef<str> + ?Sized,

Parse only a single Contact, ignore the rest

Just like parse_address_list, this function “fails” with Error::Empty when the supplied string is empty.

Examples

Single contact:

let single = parse_contact("<retpoŝto+kontakto@example.org>").unwrap();

assert!(single.deep_eq(&Contact::new("retpoŝto+kontakto@example.org")));

Multiple contacts:

let multiple = parse_contact("courriel@example.org, exemple@example.org").unwrap();

assert!(multiple.deep_eq(&Contact::new("courriel@example.org")));

Not a contact:

match parse_contact("Mist").unwrap() {
    Contact::Garbage(_) => assert!(true),
    Contact::Email(_) => assert!(false),
}

Empty input:

match parse_contact(",") {
    Err(error::Error::Empty) => assert!(true),
    Ok(_) | Err(_) => assert!(false),
}