f you all the time的意思|示意

If the test case produces an error, you see an E. If any assertion is not true, you see an F. Next, you see that all tests that you requested finished and the time it took to complete them.

如果某个断言不是true，那么将看到F。接下来，可以看到所请求的全部测试都将完成，以及完成这些测试需要的时间。

In order for the command-line compiler to find the runtime error with -f, you must compile the program with all the same command-line parameters you used the first time you compiled it.

为了命令行编译器能用- F选项查找运行期间错误，你必须传递与第一次编译时相同的指令列表。