Fixed examples wrt new location code and added one more

examples/dereference.expected

+N 4 6 -> obj 14 4
+NI 5 9 -> null 9 25
+NI 5 9 -> obj 9 21
+N 10 2 -> null 12 7
+N 10 2 -> obj 9 15
+NO 16 9 -> null 12 7
+NO 16 9 -> obj 9 15

examples/dereference.teal

+type T(x : string, y : int);
+
+
+fun f(a : nonnull array[int], y : int) : int = {
+  return a[y];
+}
+
+fun main() = {
+  var b : T := new T("", null);
+  var c : nonnull T := b;
+
+  b := null;
+
+  f([1, 2], c.y);
+
+  return b.x;
+}

examples/pair.expected

-N 6 29 -> obj 6 29
-N 8 4 -> null 3 50
+N 14 4 -> null 12 13
+N 14 4 -> null 5 14
+N 14 4 -> obj 11 29
+N 14 4 -> obj 11 32

examples/pair.teal

 type Pair(fst : nonnull int, snd : int);
 
-fun null_producer(n : int) = if (n == 0) { return null; } else { return n; }
+fun null_producer(n : int) = {
+    if (n == 0) {
+       return null;
+    }
+    return n;
+}
 
-fun main(n : int) = {
+fun main(n : int) : nonnull int = {
     var p : Pair := new Pair(0, 1);
-    p.snd := null; // this should be fine
+    p.snd := null;
     p.fst := null_producer(n);
     return p.fst;
-}
\ No newline at end of file
+}

examples/simple-struct.expected

-N 4 25 -> obj 4 25
-N 4 28 -> obj 4 28
-N 5 15 -> obj 5 15
-N 5 18 -> obj 5 18
-N 8 6 -> obj 4 17
-N 8 6 -> obj 5 7
-N 8 6 -> null 4 31
\ No newline at end of file
+N 8 2 -> null 4 31
+N 8 2 -> obj 4 17
+N 8 2 -> obj 4 25
+N 8 2 -> obj 4 28
+N 8 2 -> obj 5 15
+N 8 2 -> obj 5 18
+N 8 2 -> obj 5 7

examples/simple-struct.teal

-type ABC(a : nonnull int, b : nonnull int, c : ABC);
+type ABC(a : int, b : int, c : ABC);
 
 fun main() = {
   var x : ABC := new ABC(1, 2, null);
   x := new ABC(3, 4, x);
 
   var sum : int := 0;
-  var it : nonnull ABC := x; 
+  var it : nonnull ABC := x;
   while it != null {
     print(it.a);
     sum := sum + it.b;
     it := it.c;
   }
   return sum;
-}
\ No newline at end of file
+}