处理序失败。
隐含转换只在处理序不遗失资料时才会成功，否则会失败并且产生编译或执行阶段错误。
Implicit conversions succeed only when the process loses no data; otherwise they fail and generate a compile or run-time error.
如果未指定这个旗标，任何要开启档案以进行读取或写入的要求(由这个处理序或其他处理序)将会失败，直到关闭档案。
If this flag is not specified, any request to open the file for reading or writing (by this process or another process) will fail until the file is closed.
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