Implemented struct pointer types

examples/point/point.q

@@ -7,10 +7,19 @@ struct Point {
 }
 
 main() {
+	p := construct()
+	print(p)
+	delete(p)
+}
+
+construct() -> *Point {
 	p := new(Point)
 	p.x = 1
 	p.y = 2
+	return p
+}
 
+print(p *Point) {
 	out := mem.alloc(8)
 	out[0] = 'x'
 	out[1] = ' '
@@ -21,7 +30,5 @@ main() {
 	out[6] = '0' + p.y
 	out[7] = '\n'
 	sys.write(1, out, 8)
-	mem.free(out)
-
-	delete(p)
+	mem.free(out, 8)
 }