It removes debugging breakpoints in M-files and reinitializes persistent variables, since the breakpoints for a function and persistent variables are cleared whenever the M-file is changed or cleared.

不论m - file是否被改变或删除，如果函数和永恒变量的断点被删除了，那么M - file中调试断点和初始化的断点变量都将被删除。

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