8,19d7
< // We also introduce the handy ".?" shortcut:
< //
< //     const foo = bar.?;
< //
< // is the same as
< //
< //     const foo = bar orelse unreachable;
< //
< // See if you can find where we use this shortcut below.
< //
< // Now let's make those elephant tails optional!
< //
24c12
<     tail: *Elephant = null, // Hmm... tail needs something...
---
>     tail: ?*Elephant = null, // <---- make this optional!
54c42
<         if (e.tail == null) ???;
---
>         if (e.tail == null) break;