File: tcallbacks.nim

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discard """
  exitcode: 0
  output: '''3
2
1
5
'''
"""
import asyncfutures

let f1: Future[int] = newFuture[int]()
f1.addCallback(proc() = echo 1)
f1.addCallback(proc() = echo 2)
f1.addCallback(proc() = echo 3)
f1.complete(10)

let f2: Future[int] = newFuture[int]()
f2.addCallback(proc() = echo 4)
f2.callback = proc() = echo 5
f2.complete(10)