// user defined function
func foo :: (a, b) -> Bool = {
    return a == b;
};

// entry point
func main :: () -> Int = {
    // if else in variable definition
    let cond_str :: String = if true { return "t" } else { return "f" };

    // Infix operator
    let n :: Bool = 2 == 2;
    // Prefix operator
    let m :: Bool = !n;
};