Add documentation on str::starts_with
#120764
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Add documentation about a current footgun of `str::starts_with`
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m-ou-se
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Feb 8, 2024
library/core/src/str/mod.rs
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| /// Note that there is a footgun to this method when using a slice of [`char`]s. | ||
| /// Some users may expect that a slice of chars will behave similarly to a `&str` with this method. | ||
| /// That is not currently the case. When you pass a slice of [`char`]s to this method, it will return true | ||
| /// if any of the [`char`]s in the slice is the first [`char`] of this string slice. It does not work for | ||
| /// sequentially comparing a slice of [`char`]s to a string slice. See the second example below. |
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I don't think this wording (with "footgun", "some users", "currently", etc.) is very useful.
How about instead just adding a bit more detail to the paragraph above? Maybe something in this direction?
- /// The [pattern] can be a `&str`, [`char`], a slice of [`char`]s, or a
- /// function or closure that determines if a character matches.
+ /// The [pattern] can be a `&str` to check for a prefix,
+ /// or a [`char`], slice of [`char`]s, or function or closure
+ /// to check the first character for a match.
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@m-ou-se how does that look? |
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Thanks! @bors r+ rollup |
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…iaskrgr Rollup of 8 pull requests Successful merges: - rust-lang#117614 (static mut: allow mutable reference to arbitrary types, not just slices and arrays) - rust-lang#120719 (Remove support for `associated_type_bound` nested in `dyn` types) - rust-lang#120764 (Add documentation on `str::starts_with`) - rust-lang#120823 (Clarify that atomic and regular integers can differ in alignment) - rust-lang#120859 (Loosen an assertion to account for stashed errors.) - rust-lang#120865 (Turn the "no saved object file in work product" ICE into a translatable fatal error) - rust-lang#120866 (Remove unnecessary `#![feature(min_specialization)]`) - rust-lang#120870 (Allow restricted trait impls under `#[allow_internal_unstable(min_specialization)]`) r? `@ghost` `@rustbot` modify labels: rollup
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Rollup merge of rust-lang#120764 - Alfriadox:master, r=m-ou-se Add documentation on `str::starts_with` Add documentation about a current footgun of `str::starts_with`
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Add documentation about a current footgun of
str::starts_with