daviddoji/100-exercises-to-learn-rust
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
Daniel Wagner-Hall 2024-12-18 10:05:01 +00:00 committed by GitHub
parent fd6a56fd84
commit ab1eb5d80c
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
book/src/05_ticket_v2/02_match.md
View File

@ -68,3 +68,10 @@ match status {
``` ```
The `_` pattern matches anything that wasn't matched by the previous patterns. 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>