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Showing content from https://doc.rust-lang.org/nightly/alloc/string/trait.ToString.html below:

ToString in alloc::string - Rust

pub trait ToString {
    // Required method
    fn to_string(&self) -> String;
}

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 instead, and you get the ToString implementation for free.

Converts the given value to a String.

let i = 5;
let five = String::from("5");

assert_eq!(five, i.to_string());

In this implementation, the to_string method panics if the Display implementation returns an error. This indicates an incorrect Display implementation since fmt::Write for String never returns an error itself.

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