Simple Exmaple on plugins to MAIN sub

Doubler.pm6

module Doubler {
    sub doubler ( Cool() $x ) { $x *2 }

    #| Doubles the given value
    multi sub MAIN( "double", Cool() $x ) is export(:main) {
        say "double( {$x} ) => {doubler($x)}";
    }
}

script.p6

#!/usr/bin/perl6

use v6;

use Doubler :main;

#| Various numeric operations
multi sub MAIN( Bool :h(:$help) where so * ) {
    say $*USAGE;
}