Rust Brain Teasers

Puzzle 21

Tying a Gordian Knot

gordian_knot/src/main.rs

#[derive(Debug)]
struct Parser<'a> {
    body: String,
    subtext : &'a str,
}

fn main() {
    let mut document = Parser {
        body: "Hello".to_string(),
        subtext: ""
    };
    document.subtext = &document.body;

    let b = document;
    println!("{:?}", b);
}

Guess the Output
	Try to guess what the output is before moving to the next page.

The program will fail to compile with the following message:

error[E0505]: cannot move out of `document` because it is borrowed
 --> ...