Code shared from the Rust Playground

playground.rs

const fn true_fn() -> bool { true }

fn main() -> Result<(), Box<std::error::Error>> {
    let num = true;
    
    const TRUE: bool = true_fn();
    match num {
        TRUE => println!("Is u64::max_value()"),
        false => println!("Is boring")
    }
    Ok(())
}