improve addressof

example/main.nub

@@ -5,15 +5,19 @@ struct Human {
 }
 
 export func main(args: []^string): i64 {
-    let x = [3]f64
+    let age: u64 = 23
 
-    x[0] = 1
-    x[1] = 2
-    x[2] = 3
+    let me = alloc Human {
+        age = &age
+    }
 
-    c::printf("%f\n", x[0])
-    c::printf("%f\n", x[1])
-    c::printf("%f\n", x[2])
+    me.age^ = 24.5
+
+    test(me.age^)
 
     return 0
 }
+
+func test(me: u64) {
+    c::printf("%d\n", me)
+}