Tasks

tasks.sub

fn work() {
  let a = spawn(fn() {
    print("a runs")
    1
  })
  let b = spawn(fn() {
    print("b never runs")
    2
  })
  let r = await(a) or 0
  r + 10
}
print(work())

a runs
11

A task is lazy and structured. spawn makes it, await runs it and gives its result, and a task nobody awaited is cancelled when its function ends. b never runs is never printed.