Struct enum variants

struct_variants.rs

enum TestEnum {
    DataA { f: String, l: String },
    DataB { n: String },
}

impl std::fmt::Display for TestEnum {
    fn fmt(&self, fmt: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
        match self {
            &TestEnum::DataA { ref f, ref l } => write!(fmt, "{}, {}", l, f),
            &TestEnum::DataB { ref n } => fmt.write_str(&n),
        }
    }
}

fn main() {
    let x = TestEnum::DataA {
        f: "Maximus".to_string(),
        l: "Hardcorion".to_string(),
    };

    let y = TestEnum::DataB {
        n: "Maximus Hardcorion".to_string(),
    };

    println!("{}", x);
    println!("{}", y);
}