test "" {
    // There are 2 ways to specify how the type of x is determined:
    // Option 1: peer(peer(x, y), z)
    // Option 2: peer(x, y, z)
    const x = if (a) outer: {
        if (b) inner: {
            break :inner x;
        } else inner: {
            break :inner y;
        }
    } else outer: {
        break :outer z;
    };
}