& Lesson 4: Making functions and naming them

& It's tedious to type out the whole `repeat 4 {...}` scene.
& Let's give this set of commands a name:

fn box! () -> repeat 4 {
	forward! (100)
	right! (0.25)
}

& fn box! () -> repeat 4 {
& fn                       `fn` is a special form
&                          It creates a function.
&    box!                  `box!` is the name of our new function
&                          Note that it ends with `!`: by convention,
&                          all commands end with a "bang" like this.
&         ()               `box!` doesn't take arguments.
&                          This represents an empty list of args.
&            ->            This arrow is basically punctuation.
&               repeat 4 { We already know what this is.

& Run this code. What happens?

& If you want to actually draw a box, what does that look like?