Rollup of 7 pull requests #102632
Merged
Rollup of 7 pull requests #102632
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.
…ssary `Default` bounds
Co-Authored-By: Mark Rousskov <mark.simulacrum@gmail.com>
Co-authored-by: Michael Goulet <michael@errs.io>
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
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`?
…compiler-errors Add diagnostic struct for const eval error in `rustc_middle` Part of rust-lang#100717. r? `@ghost`
rustbot
added
A-translation
|
@bors r+ rollup=never p=7 |
bors
added
the
S-waiting-on-bors
|
☀️ Test successful - checks-actions |
|
📌 Perf builds for each rolled up PR: previous master: 0922559768 In the case of a perf regression, run the following command for each PR you suspect might be the cause: |
This was referenced Oct 4, 2022
Closed
|
Finished benchmarking commit (f83e026): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
Footnotes |
davidtwco
removed
the
A-translation
# 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)rustc_middle#102486 (Add diagnostic struct for const eval error inrustc_middle)Failed merges:
r? @ghost
@rustbot modify labels: rollup
Create a similar rollup