Fix some tests and do some cleanup.

test/precedence_test.inx

@@ -0,0 +1,7 @@
+vertex main :: () {
+	x : float = 2.0;
+	y : float = 5.0;
+	z : float = 10.0;
+
+	w : float = (x * y) + y * (z - x / (y * x));
+}