Fix some tests and do some cleanup.

test/wrong_argument_count.inx

@@ -0,0 +1,11 @@
+foo :: (x : float, y : float, z : float) -> float {
+	return x * y * z;
+}
+foo :: (x : float, y : float, z : float, w : float) -> float {
+	return x * y * z * w;
+}
+
+vertex main :: () {
+	foo(2.0, 3.0);
+}
+