#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_assignments)]

fn main() {
    let ambient = 5;

    let pred = |v: u64| {
        let x = v*3-7;
        if x < 200 {
            println!("x is too small");
        }

        x == ambient
    };

    println!("{}", pred(5));
    println!("{}", pred(4));
}