Observe same-sender FIFO with send then request

Observe same-sender FIFO with send then request

Canonical source: protos/examples/concurrency/actor-send-fifo.protos at locked revision e99b712ecf658a527b1fe82c8beba2c1286d8dc9.

This executable example is rendered from the exact Protos source consumed by the website. Its program body is copied without modification.

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// Same-sender messages to one concrete Actor preserve FIFO at acceptance.
worker: Actor.spawn("std:collections/Set", "call")
worker.send("atPut", "ready", true)
print(worker.request("size").value())
worker.stop()

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