フルパス指定(Fully qualified path)(@Rust)

    let username = UsernameWidget::get(&form);
    assert_eq!("rustacean".to_owned(), username);
    let age = AgeWidget::get(&form);
    assert_eq!(28, age);

trait UsernameWidget {
    // Get the selected username out of this widget
    fn get(&self) -> String;
    fn new(name: String, age: u8) -> Self;
}

trait AgeWidget {
    // Get the selected age out of this widget
    fn get(&self) -> u8;
}

// A form with both a UsernameWidget and an AgeWidget
struct Form {
    username: String,
    age: u8,
}

impl UsernameWidget for Form {
    fn get(&self) -> String {
        self.username.clone()
    }

    fn new(str: String, age: u8) -> Self {
        Form {
            username: str,
            age: age,
        }
    }
}

impl AgeWidget for Form {
    fn get(&self) -> u8 {
        self.age
    }
}

fn main() {
    // both UsernameWidget & AgeWidget are implemeneted to Form, you can use Form::new() instead of  
    // the fully-qualified path <form as="" usernamewidget="">::new(...) 
    let form = Form::new(String::from("John"), 30); 
    let username = UsernameWidget::get(&form); 
    assert_eq!("John".to_owned(), username); 
    let age = AgeWidget::get(&form); assert_eq!(30, age); 
}