ZigzagScan with pattern matching

ZigzagScan.rs

const X: u32 = 5;
const Y: u32 = 5;

fn step(x: u32, y: u32) -> i32 {
    dbg!((x, y));
    match (x, y) {
        (X, Y) => 1,
        (..X, 0) => match x % 2 {
            0 => step(x + 1, y),
            _ => step(x - 1, y + 1),
        },
        (0, ..Y) => match y % 2 {
            0 => step(x + 1, y - 1),
            _ => step(x, y + 1),
        },
        (X, ..Y) => match y % 2 {
            0 => step(x - 1, y + 1),
            _ => step(x, y + 1),
        },
        (..X, Y) => match x % 2 {
            0 => step(x + 1, y),
            _ => step(x + 1, y - 1),
        },
        (x, y) => match x.abs_diff(y) % 2 {
            0 => step(x + 1, y - 1),
            _ => step(x - 1, y + 1),
        },
    }
}

fn main() {
    step(0, 0);
}