RUST

..= in rust

..=	..=expr, expr..=expr	Right-inclusive range literal	PartialOrd

..= is an operator that is used to generate ranges

what is () in rust

// The () type, also called “unit”.
// The () type has exactly one value (),
// and is used when there is no other meaningful value that could be returned:

fn long() -> () {}

fn short() {}