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Warn about the risks of using catch-all patterns (#200)

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Daniel Wagner-Hall 2024-12-18 10:05:01 +00:00 committed by GitHub
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book/src/05_ticket_v2/02_match.md
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@ -68,3 +68,10 @@ match status {
```
The `_` pattern matches anything that wasn't matched by the previous patterns.
<div class="warning">
By using this catch-all pattern, you _won't_ get the benefits of compiler-driven refactoring.\
If you add a new enum variant, the compiler _won't_ tell you that you're not handling it.
If you're keen on correctness, avoid using catch-alls. Leverage the compiler to re-examine all matching sites and determine how new enum variants should be handled.
</div>