#![allow(unused_variables, dead_code)]

pub trait Summary {
    fn summarize(&self) -> String;
}

pub struct Tweet {
    pub username: String,
    pub content: String,
    pub reply: bool,
    pub retweet: bool,
}

impl Summary for Tweet {
    fn summarize(&self) -> String {
        format!("{}: {}", self.username, self.content)
    }
}

// Use trait bounds to say what functionality the param must implement.
fn notify<T: Summary>(item: T) {
    println!("Breaking news! {}", item.summarize());
}

fn main() {
    let tweet = Tweet {
        username: String::from("horse_ebooks"),
        content: String::from("of course, as you probably already know, people"),
        reply: false,
        retweet: false,
    };

    notify(tweet);
}