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$ cargo run
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Compiling collections v0.1.0 (file:///projects/collections)
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error[E0277]: the type `str` cannot be indexed by `{integer}`
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--> src/main.rs:3:16
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3 | let h = s1[0];
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| ^ string indices are ranges of `usize`
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= help: the trait `SliceIndex<str>` is not implemented for `{integer}`, which is required by `String: Index<_>`
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= note: you can use `.chars().nth()` or `.bytes().nth()`
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for more information, see chapter 8 in The Book: <https://doc.rust-lang.org/book/ch08-02-strings.html#indexing-into-strings>
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= help: the trait `SliceIndex<[_]>` is implemented for `usize`
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= help: for that trait implementation, expected `[_]`, found `str`
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= note: required for `String` to implement `Index<{integer}>`
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For more information about this error, try `rustc --explain E0277`.
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error: could not compile `collections` (bin "collections") due to 1 previous error
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