Registering event listeners

using-events.pl

    submethod BUILD (:$events!) {
        $events.listen:
            'EOF' => {
                # Safety to prevent infinite loop, in case
                # the quit-on-undef logic fails
                unless $*IN.eof {
                    my $input = prompt("\n> ");
                    $events.emit('command', :$input);
                }
            },
            'quit' => { say "Goodbye!" },
            'exit' => { exit },
            'no-parse' => { print @begYourPardon.pick; },
            ;
    }