A Default Method You Can Override

10 points

Summary::summarize has a default body. Implement it for Tweet so it overrides the default with "@username: content". Draft's impl is already given, empty — it deliberately falls through to the default, which your Tweet impl must not touch.

Required signature

pub trait Summary {     fn summarize(&self) -> String {         String::from("(no summary available)")     } }  pub struct Tweet {     pub username: String,     pub content: String, }  impl Summary for Tweet {     fn summarize(&self) -> String; }  pub struct Draft;  impl Summary for Draft {}

Visible tests

overrides_for_tweet

#[test]
fn overrides_for_tweet() {
    let t = Tweet { username: "rustlang".to_string(), content: "1.80 is out".to_string() };
    assert_eq!(t.summarize(), "@rustlang: 1.80 is out");
}

A Default Method You Can Override

Required signature

Visible tests

Your solution