The line number displayed may not always be where the actual error originated.
错误消息中显示的行号不一定是出现错误的实际位置。
If you have a nested build, you might need to thread up through a bunch of error messages to find the actual error.
如果有一个嵌套的编译,可能会需要通过对一组错误消息来仔细进行分析,才能找到确切的错误。
This construct is used to return to the calling application the actual error that caused the statement to fail, as shown in Listing 17.
该结构用于将实际的错误返回给调用应用程序,这个错误致使语句执行失败,如清单17所示。
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