这个对象必须有一个名为 run() 的方法，在调用堆栈中的当前帧特别做了如上所述的标记时，由运行时执行这个方法。
This object must have a method called run(), which is executed by the runtime once the current frame in the call stack is specially marked as described above.
获取函数的元数据标记，该函数包含与此堆栈帧关联的代码。
Gets the metadata token for the function that contains the code associated with this stack frame.
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