//@ `#[derive(Clone)]` right before the definition of `SomethingOrNothing`.
// **Exercise 05.2**: Write some more functions on `BigInt`. What about a function that returns the number of
-// digits? The number of non-zero digits? The smallest/largest digit?
+// digits? The number of non-zero digits? The smallest/largest digit? Of course, these should all just borrow `self`.
// ## Mutation + aliasing considered harmful (part 2)
//@ Now that we know how to borrow a part of an `enum` (like `v` above), there's another example for why we
Variant::Number(ref mut n) => ptr = n,
Variant::Text(_) => return,
}
- /* var = Variant::Text(text); */
+ /* var = Variant::Text(text); */ /* BAD! */
*ptr = 1337;
}
//@ Now, imagine what would happen if we were permitted to also mutate `var`. We could, for example,