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$ cargo run
Compiling collections v0.1.0 (file:///projects/collections)
error[E0277]: the type `String` cannot be indexed by `{integer}`
--> src/main.rs:3:13
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3 | let h = s1[0];
| ^^^^^ `String` cannot be indexed by `{integer}`
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= help: the trait `Index<{integer}>` is not implemented for `String`
= help: the following other types implement trait `Index<Idx>`:
<String as Index<RangeFrom<usize>>>
<String as Index<RangeFull>>
<String as Index<RangeInclusive<usize>>>
<String as Index<RangeTo<usize>>>
<String as Index<RangeToInclusive<usize>>>
<String as Index<std::ops::Range<usize>>>
<str as Index<I>>
For more information about this error, try `rustc --explain E0277`.
error: could not compile `collections` due to previous error
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