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= help: the trait `SliceIndex<[{integer}]>` is not implemented for `u8`
= help: the trait `SliceIndex<[T]>` is implemented for `usize`
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= help: the trait `SliceIndex<[{integer}]>` is not implemented for `u8`
= help: the trait `SliceIndex<[T]>` is implemented for `usize`