Boolean

true
false

fn main() {
    //explicitly define a bool
    let is_bool:bool = true;
    println!("explicitly_defined: {}", is_bool);
    
    // implicit
    let a = true;
    let b = false;
    println!("a: {}", a);
    println!("b: {}", b);

}

Expression result

fn main() {
    // get a value from an expression
    let c = 10 > 2;
    println!("c: {}", c);
}