// The types are so similar, that we can provide a generic function to construct a `SomethingOrNothing<T>`
// from an `Option<T>`, and vice versa.
-// **Exercise**: Implement such functions! I provided a skeleton of the solution. Here,
+// **Exercise 02.1**: Implement such functions! I provided a skeleton of the solution. Here,
// `panic!` is another macro. This one terminates execution with the given message.
//
// Notice the syntax for giving generic implementations to generic types: Think of the first `<T>`