question idea: parentheses-dependent code

[rodrimati1992]

Credit goes to helix65535 (on the Rust Programming Language Community server)

This is code that does two different things depending purely on parenthetization:

use std::ops::{Sub, Neg};

struct Evil;

impl Sub<Evil> for () {
    type Output = &'static str;
    fn sub(self, _: Evil) -> &'static str {
        "sub"
    }
}

impl Neg for Evil {
    type Output = &'static str;
    fn neg(self) -> &'static str {
        "neg"
    }
}

fn main() {
    println!("{}", {
        loop { break; } - Evil
    });
    println!("{}", {(
        loop { break; } - Evil
    )});
}

it prints

neg
sub