Overview 概要
The elements returned by this iterator appear in the order that the tasks completed, not in the order that those tasks were added to the task group. このイテレータによって返される要素それらは、タスクそれらが完了した順番に現れます、それらタスクがタスクグループに加えられた順番にではなく。
This iterator terminates after all tasks have completed. After iterating over the results of each task, it’s valid to make a new iterator for the task group, which you can use to iterate over the results of new tasks you add to the group. For example: 例えば：
group.addTask { 1 }
for await r in group { print(r) }
// Add a new child task and iterate again.
group.addTask { 2 }
for await r in group { print(r) }