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c5231f0ce3
Otherwise it won't actually test the change of state.message and it would fail to check if the user missed changing state.message This happened to me as I had a catch-all line in `match`
Exercise to Book Chapter mapping
| Exercise | Book Chapter |
|---|---|
| variables | §3.1 |
| functions | §3.3 |
| if | §3.5 |
| primitive_types | §3.2, §4.3 |
| vecs | §8.1 |
| move_semantics | §4.1-2 |
| structs | §5.1, §5.3 |
| enums | §6, §18.3 |
| strings | §8.2 |
| modules | §7 |
| hashmaps | §8.3 |
| options | §10.1 |
| error_handling | §9 |
| generics | §10 |
| traits | §10.2 |
| tests | §11.1 |
| lifetimes | §10.3 |
| iterators | §13.2-4 |
| threads | §16.1-3 |
| smart_pointers | §15, §16.3 |
| macros | §19.6 |
| clippy | §21.4 |
| conversions | n/a |