trait_mixin1.rs

struct StdoutLogger {}

impl std::fmt::Display for StdoutLogger {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        writeln!(f, "I am StdoutLogger")
    }
}

fn main() {
    let l = StdoutLogger {};
    println!("{}", l);
}