use std::fmt;

fn main() {
    let hell = abc_123(); //"abc 123";
    let say = TestMsg { msg: "hi there" };

    let _say:TestMsg;

    let _say_again = say.clone();
    let _psay: &TestMsg = &say;


    println!("var0. {}", hell);
    println!("var1. {}", say);
    println!("var1a. {}", (*_psay).msg);
    println!("var2. {:?}", say);
}

#[derive(Debug,Clone)]
struct TestMsg<'a> {
    msg: &'a str,
}

fn abc_123 () -> & 'static str {
     "abc 123"
}

impl<'a> fmt::Display for TestMsg<'a> {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "test1 {}", self.msg)
    }
}