fn index(&self, index: ops::RangeToInclusive<usize>) -> &str {
        Index::index(&**self, index)
    }
A trait for converting a value to a `String`.

This trait is automatically implemented for any type which implements the
[`Display`] trait. As such, `ToString` shouldn't be implemented directly:
[`Display`] should be implemented
benchmarks/haystacks/code/rust-library.rs