--- exercises/046_optionals2.zig	2023-10-03 22:15:22.122241138 +0200
+++ answers/046_optionals2.zig	2023-10-05 20:04:07.049433424 +0200
@@ -21,7 +21,7 @@
 
 const Elephant = struct {
     letter: u8,
-    tail: *Elephant = null, // Hmm... tail needs something...
+    tail: ?*Elephant = null, // <---- make this optional!
     visited: bool = false,
 };
 
@@ -51,7 +51,7 @@
         // We should stop once we encounter a tail that
         // does NOT point to another element. What can
         // we put here to make that happen?
-        if (e.tail == null) ???;
+        if (e.tail == null) break;
 
         e = e.tail.?;
     }