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promise-chan

  • (promise-chan)
  • (promise-chan xform)
  • (promise-chan xform ex-handler)
Creates a promise channel with an optional transducer, and an optional
exception-handler. A promise channel can take exactly one value that consumers
will receive. Once full, puts complete but val is dropped (no transfer).
Consumers will block until either a value is placed in the channel or the
channel is closed. See chan for the semantics of xform and ex-handler.