Constant VND_RESTFUL_JSON 

pub const VND_RESTFUL_JSON: Mime;

[Stephen_Mizell]

let media = mime2::application::VND_RESTFUL_JSON;
assert_eq!(media.ttype, "application");
assert_eq!(media.subtype, "vnd.restful+json");
assert_eq!(media.to_string(), "application/vnd.restful+json");