use constant SCROLL_X => 1;
use constant SCROLL_Y => 2;
use constant FLOW_X   => 3;
use constant FLOW_Y   => 4;

##</code><code>##

use canstant {
    SCROLL_X => 1,
    SCROLL_Y => 2,
    FLOW_X   => 3,
    FLOW_Y   => 4,
};