Value swap macros for Haxe

Swap.hx

class Main {
	macro static function swap(a, b) {
		return macro { var v = $a; $a = $b; $b = v; };
	}
	static function main() {
		var i = 10, j = 15;
		trace(i, j); // 10, 15
		swap(i, j);
		trace(i, j); // 15, 10
	}
}