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b7ddd09fab
Adjust error text and naming to conform with best practices. Use `map_err()` instead of `or()`. Wrap lower-level errors instead of ignoring their details. Also, don't "cheat" by bypassing the `new()` function in tests. Fix a dangling reference in the try_from_into hints.
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 |