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error[E0277]: the type `[{integer}]` cannot be indexed by `i32`
--> $DIR/index-help.rs:3:7
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LL | x[0i32];
| ^^^^ slice indices are of type `usize` or ranges of `usize`
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= help: the trait `SliceIndex<[{integer}]>` is not implemented for `i32`
= help: the following other types implement trait `SliceIndex<T>`:
`usize` implements `SliceIndex<ByteStr>`
`usize` implements `SliceIndex<[T]>`
= note: required for `Vec<{integer}>` to implement `Index<i32>`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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