# Example usage of IO::Async in Perl
use IO::Async::Loop;
use IO::Async::Timer::Countdown;
my $loop = IO::Async::Loop->new;
my $timer = IO::Async::Timer::Countdown->new(
delay => 5,
on_done => sub { print "Timer expired!\n" },
);
$loop->add($timer);
$timer->start;
$loop->run;
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