X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/f5a79e8aaa07e56cf2dd8fe8438d96624dd84fbc..d9fc9a4d89d8e4950f43308318962d9179bd1177:/src/part05.rs

diff --git a/src/part05.rs b/src/part05.rs
index 03c10d3..84f14ff 100644
--- a/src/part05.rs
+++ b/src/part05.rs
@@ -110,6 +110,9 @@ impl<T: Clone> Clone for SomethingOrNothing<T> {
 // Again, Rust will generate this implementation automatically if you add
 // `#[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?
+
 // ## 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
 // have to rule out mutation in the presence of aliasing. First, we define an `enum` that can hold either