确保结合某一类型的错误处理策略，以处理万一客户端代码传入无效索引值的情况。

Be sure to incorporate some type of error-handling strategy to handle the chance of client code passing in an invalid index value.

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此错误指示您尝试在泛型类型中修改初始值设定项。

This error indicates that you tried to modify an initializer in a generic type.

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例如，输入了整型值的错误格式或对短型而言太大的值。

For example, entering the wrong format for an integer value or too big of a value for a short value.

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