trpl-zh-cn/listings/ch20-advanced-features/no-listing-20-impl-hellomacro-for-pancakes/pancakes/src/main.rs

use hello_macro::HelloMacro;

struct Pancakes;

impl HelloMacro for Pancakes {
    fn hello_macro() {
        println!("Hello, Macro! My name is Pancakes!");
    }
}

fn main() {
    Pancakes::hello_macro();
}