Rollup of 7 pull requests #102626
Closed
Rollup of 7 pull requests #102626
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
The wording is copied from `std::sync::atomic::AtomicPtr`, with additional advice on how to `#[cfg]` for it.
In particular, be clear that it is sound to specify memory not originating from a previous `Vec` allocation. That is already suggested in other parts of the documentation about zero-alloc conversions to Box<[T]>. Incorporate a constraint from `slice::from_raw_parts` that was missing but needs to be fulfilled, since a `Vec` can be converted into a slice.
- Explicitly mention that `AsRef` and `AsMut` do not auto-dereference generally for all dereferencable types (but only if inner type is a shared and/or mutable reference) - Give advice to not use `AsRef` or `AsMut` for the sole purpose of dereferencing - Suggest providing a transitive `AsRef` or `AsMut` implementation for types which implement `Deref` - Add new section "Reflexivity" in documentation comments for `AsRef` and `AsMut` - Provide better example for `AsMut` - Added heading "Relation to `Borrow`" in `AsRef`'s docs to improve structure Issue rust-lang#45742 and a corresponding FIXME in the libcore suggest that `AsRef` and `AsMut` should provide a blanket implementation over `Deref`. As that is difficult to realize at the moment, this commit updates the documentation to better describe the status-quo and to give advice on how to use `AsRef` and `AsMut`.
Fixed examples in sections "Generic Implementations" of `AsRef`'s and `AsMut`'s doc comments, which failed tests.
Better conform to Rust API Documentation Conventions
Changed wording in sections on "Reflexivity": replaced "that is there is" with "i.e. there would be" and removed comma before "with" Reason: "there is" somewhat contradicted the "would be" hypothetical. A slightly redundant wording has now been chosen for better clarity. The comma seemed to be superfluous.
lines_any method was replaced with lines method, so it makes sense to rename this structure to match new name. Co-authored-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
Previously "bare\r" was split into ["bare"] even though the documentation said that only LF and CRLF count as newlines. This fix is a behavioural change, even though it brings the behaviour into line with the documentation, and into line with that of `std::io::BufRead::lines()`. This is an alternative to rust-lang#91051, which proposes to document rather than fix the behaviour. Fixes rust-lang#94435. Co-authored-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
…ssary `Default` bounds
Co-Authored-By: Mark Rousskov <mark.simulacrum@gmail.com>
Document the conditional existence of `alloc::sync` and `alloc::task`. `alloc` declares ```rust #[cfg(target_has_atomic = "ptr")] pub mod sync; ``` but there is no public documentation of this condition. This PR fixes that, so that users of `alloc` can understand how to make their code compile everywhere `alloc` does, if they are writing a library with impls for `Arc`. The wording is copied from `std::sync::atomic::AtomicPtr`, with additional advice on how to `#[cfg]` for it. I feel quite uncertain about whether the paragraph I added to `Arc`'s documentation should actually be there, as it is a distraction for anyone using `std`. On the other hand, maybe more reminders that no_std exists would benefit the ecosystem. Note: `target_has_atomic` is [stabilized](rust-lang#32976) but [not yet documented in the reference](rust-lang/reference#1171).
docs: be less harsh in wording for Vec::from_raw_parts In particular, be clear that it is sound to specify memory not originating from a previous `Vec` allocation. That is already suggested in other parts of the documentation about zero-alloc conversions to Box<[T]>. Incorporate a constraint from `slice::from_raw_parts` that was missing but needs to be fulfilled, since a `Vec` can be converted into a slice. Fixes rust-lang#98780.
…riplett docs: Improve AsRef / AsMut docs on blanket impls There are several issues with the current state of `AsRef` and `AsMut` as [discussed here on IRLO](https://internals.rust-lang.org/t/semantics-of-asref/17016). See also rust-lang#39397, rust-lang#45742, rust-lang#73390, rust-lang#98905, and the FIXMEs [here](https://github.com/rust-lang/rust/blob/1.62.0/library/core/src/convert/mod.rs#L509-L515) and [here](https://github.com/rust-lang/rust/blob/1.62.0/library/core/src/convert/mod.rs#L530-L536). These issues are difficult to fix. This PR aims to update the documentation to better reflect the status-quo and to give advice on how `AsRef` and `AsMut` should be used. In particular: - Explicitly mention that `AsRef` and `AsMut` do not auto-dereference generally for all dereferencable types (but only if inner type is a shared and/or mutable reference) - Give advice to not use `AsRef` or `AsMut` for the sole purpose of dereferencing - Suggest providing a transitive `AsRef` or `AsMut` implementation for types which implement `Deref` - Add new section "Reflexivity" in documentation comments for `AsRef` and `AsMut` - Provide better example for `AsMut` - Added heading "Relation to `Borrow`" in `AsRef`'s docs to improve structure
…, r=joshtriplett Fix handling of trailing bare CR in str::lines Continuing from rust-lang#91191. Fixes rust-lang#94435.
Tweak `FpCategory` example order. Follow same order for variable declarations and assertions.
…default-annotated-derive, r=joshtriplett
Fix `#[derive(Default)]` on a generic `#[default]` enum adding unnecessary `Default` bounds
That is, given something like:
```rs
// #[default] on a generic enum does not add `Default` bounds to the type params.
#[derive(Default)]
enum MyOption<T> {
#[default]
None,
Some(T),
}
```
then `MyOption<T> : Default`_as currently implemented_ only holds when `T : Default`, as reported by `@5225225` [over Zulip](https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/.23.5Bderive.28Default.29.5D.20for.20enums.20with.20fields).
This is contrary to [what the accepted RFC proposes](https://rust-lang.github.io/rfcs/3107-derive-default-enum.html#generated-bounds) (_i.e._, that `T` be allowed not to be itself `Default`), and indeed seems to be a rather unnecessary limitation.
…git, r=joshtriplett
introduce `{char, u8}::is_ascii_octdigit`
This feature adds two new APIs: `char::is_ascii_octdigit` and `u8::is_ascii_octdigit`, under the feature gate `is_ascii_octdigit`. These methods are shorthands for `char::is_digit(self, 8)` and `u8::is_digit(self, 8)`:
```rust
// core::char
impl char {
pub fn is_ascii_octdigit(self) -> bool;
}
// core::num
impl u8 {
pub fn is_ascii_octdigit(self) -> bool;
}
```
---
Couple of things I need help understanding:
- `const`ness: have I used the right attribute in this case?
- is there a way to run the tests for `core::char` alone, instead of `./x.py test library/core`?
rustbot
added
T-compiler
|
@bors r+ rollup=never p=7 |
bors
added
the
S-waiting-on-bors
|
The job Click to see the possible cause of the failure (guessed by this bot) |
|
⌛ Testing commit 7c7a12f with merge 281bb50141864363e1986e607242c612374088a9... |
|
💔 Test failed - checks-actions |
bors
added
S-waiting-on-review
|
The job Click to see the possible cause of the failure (guessed by this bot) |
# for free
to join this conversation on GitHub.
Already have an account?
# to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Successful merges:
alloc::syncandalloc::task. #98218 (Document the conditional existence ofalloc::syncandalloc::task.)FpCategoryexample order. #100470 (TweakFpCategoryexample order.)#[derive(Default)]on a generic#[default]enum adding unnecessaryDefaultbounds #101040 (Fix#[derive(Default)]on a generic#[default]enum adding unnecessaryDefaultbounds){char, u8}::is_ascii_octdigit#101308 (introduce{char, u8}::is_ascii_octdigit)Failed merges:
r? @ghost
@rustbot modify labels: rollup
Create a similar rollup