version: '3'

silent: true

tasks:
  default:
    # Without failfast the run waits for `owner` anyway, hiding what is tested.
    failfast: true
    deps: [owner, joiner]

  # Holds the shared task far longer than `joiner` waits, so `joiner` reaches
  # the deduplication path while it is still running.
  owner:
    cmds:
      - task: shared

  joiner:
    cmds:
      - sleep 0.2
      - task: shared
        timeout: 500ms
      - echo "should not be reached"

  shared:
    run: once
    cmds:
      - sleep 10