Expressions

Special care has been taken than anything can be used inside an expression. While the following would not work in languages like C

fn main() {
    let x = return;
}

this is perfectly valid kommando syntax and x (although unreachable) would get the type unit.

An expression followed by a semicolon is called a statement. Every expression must be a statement, except optionally for the very last one in a block:

fn xor(a: u8, b: u8) -> u8 {
    a ^ b
}

is equivalent to:

fn xor(a: u8, b: u8) -> u8 {
    return a ^ b;
}

This allows you to yield values from arbitrary blocks:

let r = { // r is now 25
    let a = 5;
    a * a
};