Validate_ptrs If a pointer that was previously not allocated by malloc is passed to the free call, an error message is thrown and the program is aborted.

validate_ptrs如果向free调用传递的指针并不是以前由malloc分配的，那么将会引发一个错误消息，而该程序将被中止。

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The remaining text on each line is just free-form text from the system logging the error message.

每行上的其余文本只是系统记录错误消息的自由格式文本。

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A "No results found" message if an error-free query found no results.

如果查询没有错误，但却未找到结果，就会输出一个 “No results found” 消息。

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