The other two factory methods, Promise.in and Promise.at, create a promise, which will be kept after a given number of seconds or by a given time. For example:
my $p = Promise.in(3);
for 1..5 {
say $p.status;
sleep 1;
}
The programme prints the following lines.
Planned Planned Planned Kept Kept
That means that the promise was kept after three seconds.