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close!

  • (close! chan)
Closes a channel. The channel will no longer accept any puts (they
will be ignored). Data in the channel remains available for taking, until
exhausted, after which takes will return nil. If there are any
pending takes, they will be dispatched with nil. Closing a closed
channel is a no-op. Returns nil.
 Logically closing happens after all puts have been delivered. Therefore, any
blocked or parked puts will remain blocked/parked until a taker releases them.