module Async
module Async::Clock
module Async::Debug
module Kernel
class Async::Condition
class Async::Debug::LeakError
class Async::Debug::Monitor
class Async::Debug::Selector
class Async::LimitedQueue
class Async::Node
class Async::Notification
class Async::Queue
class Async::Reactor
class Async::Semaphore
class Async::Stop
class Async::Task
class Async::TimeoutError
class Async::Wrapper
class Async::Wrapper::Cancelled
class Async::Wrapper::WaitError
async
1.20.0
# add_child
def add_child child ||= Set.new << child