rust doc

main.rs

fn main() {
    let r: i32 = sum(4,5);
    println!("{:?}", r);
    println!("Hello, world!");
}


/// # Examples
///
/// ```
/// let r: i32 = sum(4,5);
/// println!("{:?}", r);
/// 9
/// ```
pub fn sum(a: i32, b: i32) -> i32 {
    a + b
}