Is there a better version to remove the extra control?

#!env raku

my Channel $channel-job-notifier .= new;
my Channel $channel .= new;

my @p = do for 0 .. 2 -> $idx {
    start {
        loop {
            last
                if $channel.closed;
            my $d = try { $channel.receive } // last;

            $channel-job-notifier.send(("$idx", $d));

            my @args = (3);
            if $idx == 2 {
                @args = (10);
            }

            my $proc = Proc::Async.new: 'sleep', |@args;

            $proc.stdout.lines.tap(-> $v {
                # $output-fp.IO.spurt: "$v\n", :append;
            });

            await $proc.start;
        }
    };
}

for dir('./test/') -> $d is copy {
    $channel.send($d);

    my ($idx, $d-processing) = $channel-job-notifier.receive;

    "Start processing $d".say;
}

$channel.close;

await @p;