await

my $c = Channel.new;
Promise.in(1).then({$c.send(100500)});
say await $c;

my $c2 = Channel.new;
await (^5).map: {
    start {
        my $r = rand;
        sleep $r;
        $c2.send($r);
    }
}
$c2.close;
say $c2.list;

my $c3 = Channel.new;
await Promise.allof(
    start { sleep 0.5; $c3.send('1'); },
    start { sleep 0.1; $c3.send('2'); }
);
$c3.close;
say $c3.list.join: ', ';

my @promises;
for (3,1,5,2) -> $a {
    @promises.push(start {
        sleep $a;
        say $a;
    })
}
await(|@promises);

say "It took $(now - ENTER now) seconds to run";