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use std::fmt;
#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
pub struct Greeting<'a>(&'a str);
impl<'a> Greeting<'a> {
pub fn greet(target: &str) -> Greeting {
Greeting(target)
}
}
impl<'a> fmt::Display for Greeting<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Greetings, {}!", self.0)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
#[test]
fn greet_author() {
let greeter = Greeting::greet("CAD97");
assert_eq!(greeter.to_string(), "Greetings, CAD97!");
}
}