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Showing content from https://doc.rust-lang.org/nightly/std/fmt/type.Result.html below:

Result in std::fmt - Rust

pub type Result = Result<(), Error>;

The type returned by formatter methods.

use std::fmt;

#[derive(Debug)]
struct Triangle {
    a: f32,
    b: f32,
    c: f32
}

impl fmt::Display for Triangle {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "({}, {}, {})", self.a, self.b, self.c)
    }
}

let pythagorean_triple = Triangle { a: 3.0, b: 4.0, c: 5.0 };

assert_eq!(format!("{pythagorean_triple}"), "(3, 4, 5)");

pub enum Result {
    Ok(()),
    Err(Error),
}

Contains the success value

Contains the error value

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