This gives you access to additional information that should be logged on a failure condition.
这允许您访问某个失败情况下应该被记录的额外信息。
Someone may change the callee in the future to return a failure condition.
某些人将来可能改变被调用的函数，导致返回一个失败的条件。
Someone may change the callee in the future to return a failure condition.
某些人将来可能改变被调用的函数，导致返回一个失败的条件。
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