Add #[must_use] to string/char transformation methods #89694
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These methods could be misconstrued as modifying their arguments instead of returning new values. Where possible I made the note recommend a method that does mutate in place.
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r=me with the copy-paste issue corrected. |
Co-authored-by: Josh Triplett <josh@joshtriplett.org>
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@bors r+ |
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📌 Commit 2ec7588 has been approved by |
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…s, r=joshtriplett Add #[must_use] to string/char transformation methods These methods could be misconstrued as modifying their arguments instead of returning new values. Where possible I made the note recommend a method that does mutate in place. Parent issue: rust-lang#89692
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…askrgr Rollup of 10 pull requests Successful merges: - rust-lang#88707 (String.split_terminator: Add an example when using a slice of chars) - rust-lang#89605 (Fix stabilization version for `bindings_after_at`) - rust-lang#89634 (rustc_driver: Enable the `WARN` log level by default) - rust-lang#89641 (make #[target_feature] work with `asm` register classes) - rust-lang#89678 (Fix minor std::thread documentation typo) - rust-lang#89684 (Fix asm docs typo) - rust-lang#89687 (Move `read2_abbreviated` function into read2.rs) - rust-lang#89693 (Add #[must_use] to stdin/stdout/stderr locks) - rust-lang#89694 (Add #[must_use] to string/char transformation methods) - rust-lang#89697 (Fix min LLVM version for bpf-types test) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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…b-methods, r=joshtriplett Add #[must_use] to non-mutating verb methods These are methods that could be misconstrued to mutate their input, similar to rust-lang#89694. I gave each one a different custom message. I wrote that `upgrade` and `downgrade` don't modify the input pointers. Logically they don't, but technically they do... Parent issue: rust-lang#89692 r? `@joshtriplett`
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| @@ -534,6 +538,7 @@ impl str { | |||
| /// [`make_ascii_uppercase`]: str::make_ascii_uppercase | |||
| /// [`to_uppercase`]: #method.to_uppercase | |||
| #[cfg(not(no_global_oom_handling))] | |||
| #[must_use = "to uppercase the value in-place, use `make_ascii_lowercase()`"] | |||
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Good catch. There was a similar copy-paste issue that was corrected, but this one wasn't.
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Submitted PR #89814
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…b-methods, r=joshtriplett Add #[must_use] to non-mutating verb methods These are methods that could be misconstrued to mutate their input, similar to rust-lang#89694. I gave each one a different custom message. I wrote that `upgrade` and `downgrade` don't modify the input pointers. Logically they don't, but technically they do... Parent issue: rust-lang#89692 r? ``@joshtriplett``
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…b-methods, r=joshtriplett Add #[must_use] to non-mutating verb methods These are methods that could be misconstrued to mutate their input, similar to rust-lang#89694. I gave each one a different custom message. I wrote that `upgrade` and `downgrade` don't modify the input pointers. Logically they don't, but technically they do... Parent issue: rust-lang#89692 r? ```@joshtriplett```
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…s-typo, r=joshtriplett Fix uppercase/lowercase error Fix rust-lang#89694 (comment) r? ``@joshtriplett``
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…s-typo, r=joshtriplett Fix uppercase/lowercase error Fix rust-lang#89694 (comment) r? ```@joshtriplett```
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…s-typo, r=joshtriplett Fix uppercase/lowercase error Fix rust-lang#89694 (comment) r? ````@joshtriplett````
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These methods could be misconstrued as modifying their arguments instead of returning new values.
Where possible I made the note recommend a method that does mutate in place.
Parent issue: #89692