Return the last expression (no return)

• If the last thing in the function is an expression (no semi-colon at the end) then this is the returned value.
• No need for the return statement.

fn main() {
    println!("{}", add(2, 3));
    println!("{}", add(3, 4));
}

fn add(a: i32, b: i32) -> i32 {
    a + b // no semi-colon here!
}

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