当错误发生时，v8会抛出一个异常。比如，当一个脚本或者函数试图去访问一个并不存在的属性，或者调用一个并不是函数的函数。

V8 will throw an exception if an error occurs - for example, when a script or function attempts to read a property that does not exist, or if a function is called that is not a function.

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否则，Vimscript将假设该函数调用实际上是一个内置的Vim命令，并且很可能会发出报警，指出并不存在这类命令。

Otherwise, Vimscript will assume that the function call is actually a built-in Vim command and will most likely complain that no such command exists.

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QueryXBitmaps和QueryXExtents的协议请求处理程序中还存在一个整数溢出漏洞，这两个请求导致调用build_range函数。

An integer overflow vulnerability exists within the handlers for the QueryXBitmaps and QueryXExtents protocol requests. Both requests result in a call to the build_range function.

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