Old lady swallowed the fly in rust

lady.rs

#[derive(PartialEq)]
enum Action { Once, Every, Die }

fn main() {
    let animals = [
        ("horse",  Action::Die,   "She's dead, of course!"),
        ("donkey", Action::Once,  "It was rather wonky. To swallow a donkey."),
        ("cow",    Action::Once,  "I don't know how. To swallow a cow."),
        ("goat",   Action::Once,  "She just opened her throat. To swallow a goat."),
        ("pig",    Action::Once,  "Her mouth was so big. To swallow a pig."),
        ("dog",    Action::Once,  "What a hog. To swallow a dog."),
        ("cat",    Action::Once,  "Fancy that. To swallow a cat."),
        ("bird",   Action::Once,  "Quite absurd. To swallow a bird."),
        ("spider", Action::Once,  "That wriggled and jiggled and tickled inside her."),
        ("fly",    Action::Every, "I don't know why she swallowed the fly.")];

    for (i, a) in animals.iter().rev().enumerate() {
        println!("I know an old lady who swallowed a {}.\n{}", a.0, a.2);

        if a.1 == Action::Die {
            return;
        }

        for (swallowed, to_catch) in
        animals.iter().skip(animals.len() - i - 1).zip(animals.iter().skip(animals.len() - i)) {
            println!("She swallowed the {} to catch the {}.", swallowed.0, to_catch.0);
            if to_catch.1 == Action::Every {
                println!("{}", to_catch.2);
            }
        }
        println!("Perhaps she'll die.\n");
    }
}