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It was easy to write the filter in `count_iterator` incorrectly, as there are as many `Complete`d entries as there are other entries. This means both `.filter(|v| v == &value)` and `.filter(|v| != &value)` give the same result. This balances out so the number is different and the mistake will be caught appropriately.
Exercise to Book Chapter mapping
| Exercise | Book Chapter |
|---|---|
| variables | §3.1 |
| functions | §3.3 |
| if | §3.5 |
| move_semantics | §4.1 |
| primitive_types | §4.3 |
| structs | §5.1 |
| enums | §6 |
| modules | §7.2 |
| collections | §8.1 |
| strings | §8.2 |
| error_handling | §9 |
| generics | §10 |
| option | §10.1 |
| traits | §10.2 |
| tests | §11.1 |
| standard_library_types | §13.2 |
| threads | §16.1 |
| macros | §19.6 |
| clippy | n/a |
| conversions | n/a |