Irrefutable patterns

[jonathanpallant]

It might be worth adding a couple of bonus slides into Compound Types on irrefutable patterns, and how they can be used with let and also as function parameters.

pub struct Weight(f32);

pub fn process_weight(Weight(kg): Weight) {
   println!("Weight is {kg:.03}");
}

pub fn process_weight2(w: Weight) {
   let Weight(kg) = w;
   println!("Weight is {kg:.03}");
}

pub fn make_pair() -> (Weight, Weight) {
   (Weight(1.0), Weight(2.0))
}

fn main() {
   let (x, y) = make_pair(); 
   process_weight(x);
   process_weight2(y);
}

[listochkin]

Yep, I show them in code for some groups.