Void completed (v result, a attachment) executes if a task completes with a result of type v.
voidcompleted (vresult,a attachment)在任务完成结果中具有类型v时执行。
However, it returns nothing, as indicated by the v, which stands for void.
但正如V所示(表示void)，它不返回任何值。
However, it returns nothing, as indicated by the v, which stands for void.
但正如V所示(表示void)，它不返回任何值。
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