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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 `String` cannot be indexed by `{integer}`
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--> src/main.rs:3:13
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3 | let h = s1[0];
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| ^^^^^ `String` cannot be indexed by `{integer}`
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= help: the trait `Index<{integer}>` is not implemented for `String`
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= help: the following other types implement trait `Index<Idx>`:
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<String as Index<RangeFrom<usize>>>
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<String as Index<RangeFull>>
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<String as Index<RangeInclusive<usize>>>
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<String as Index<RangeTo<usize>>>
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<String as Index<RangeToInclusive<usize>>>
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<String as Index<std::ops::Range<usize>>>
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<str as Index<I>>
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For more information about this error, try `rustc --explain E0277`.
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error: could not compile `collections` due to previous error
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