NewsArticle { pub headline: String, pub location: String, pub author: String, pub content: String, } impl Summary for NewsArticle { fn summarize(&self) -> String { format!("{} pub content: String, pub reply: bool, pub repost: bool, } impl Summary for SocialPost { fn summarize(&self) -> String { format!("{}: {}", self.username, self.content) } } fn main() { let post = SocialPost { username: String::from("horse_ebooks"), content: String::from( "of course, as you probably already know, people", ),