Rollup of 8 pull requests #102630
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Rollup of 8 pull requests #102630
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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>
…triplett
Add `Option::owned`
This PR adds the following public library APIs:
```rust
impl<T: ?Sized> Option<&T> {
pub const fn owned(self) -> Option<T::Owned>
where
T: ~const ToOwned;
}
impl<T: ?Sized> Option<&mut T> {
pub fn owned(self) -> Option<T::Owned>
where
T: ~const ToOwned;
}
```
`Option::owned` is similar to `Option::cloned` and `Option::copied`, but uses the `ToOwned` trait.
---
I thought that would be easier, but since `ToOwned` is defined in the alloc crate this becomes incoherent :')
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`
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Successful merges:
Option::owned#98061 (AddOption::owned)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
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