let twice = fn(f, x) {
	return f(f(x));
};
let addTwo = fn(x) {
	return x + 2;
};
twice(addTwo, 2);

let unless = macro(condition, consequence, alternative) {
	quote(if (!(unquote(condition))) {
		unquote(consequence);
	} else {
		unquote(alternative);
	});
};
unless(10 > 5, puts("not greater"), puts("greater"));