// **Exercise 11.1**: We made the arbitrary choice of using `i32` for the arguments. Generalize the data structures above
// to work with an arbitrary type `T` that's passed to the callbacks. Since you need to call multiple callbacks with the
-// same `t: T`, you will either have to restrict `T` to `Copy` types, or pass a reference.
+// same `val: T` (in our `call` function), you will either have to restrict `T` to `Copy` types, or pass a reference.
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