But that's not really even a pattern match? Here's what a pattern match looks like: [This is from day 10 of last year's Advent of Code.]

            match (state, pipe) {
                (State::None, Pipe::Ground) => {
                    if inside {
                        n += 1;
                    }
                }
                (State::None, Pipe::Vert) => {
                    inside = !inside;
                }
                (State::None, Pipe::Se) => {
                    state = State::South;
                }
                (State::None, Pipe::Ne) => {
                    state = State::North;
                }

                // Horizontal lines make no difference to anything
                (State::North | State::South, Pipe::Horiz) => {}

                // U-turns
                (State::South, Pipe::Sw) | (State::North, Pipe::Nw) => {
                    state = State::None;
                }

                // Form a vertical line
                (State::South, Pipe::Nw) | (State::North, Pipe::Sw) => {
                    inside = !inside;
                    state = State::None;
                }

                _ => {
                    panic!("Unexpected sequence {state:?} {pipe:?}");
                }
            }