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        # Ractor::ClosedError < rb_eStopIteration

(from ruby core)
Raised when an attempt is made to send a message to a closed port, or to
retrieve a message from a closed and empty port. Ports may be closed
explicitly with Ractor#close_outgoing/close_incoming and are closed
implicitly when a Ractor terminates.

    r = { sleep(500) }
    r.take # Ractor::ClosedError

ClosedError is a descendant of StopIteration, so the closing of the
ractor will break the loops without propagating the error:

    r = do
      loop do
        msg = receive # raises ClosedError and loop traps it
        puts "Received: #{msg}"
      puts "loop exited"

    3.times{|i| r << i}
    puts "Continue successfully"

This will print:

    Received: 0
    Received: 1
    Received: 2
    loop exited
    Continue successfully


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