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Document how `MaybeUninit<Struct>` can be initialized.
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Stabilize `peekable_next_if`
This PR stabilizes the `peekable_next_if` feature
Resolves #72480
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Update LayoutError/LayoutErr stability attributes
`LayoutError` ended up not making it into 1.49.0, updating the stability attributes to reflect that.
I also pushed `LayoutErr` deprecation back a release to allow 2 releases before the deprecation comes into effect.
This change should be backported to beta.
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Make `Allocator` object-safe
This allows rust-lang/wg-allocators#83: polymorphic allocators
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Revert stabilizing integer::BITS.
We agreed in the libs meeting just now to revert stablization, since the [breakage](https://github.com/rust-lang/rust/issues/81654) is significant throughout the ecosystem, through `lexical-core`.
cc https://github.com/rust-lang/rust/issues/76904
Fixes https://github.com/rust-lang/rust/issues/81654
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Add lint for `panic!(123)` which is not accepted in Rust 2021.
This extends the `panic_fmt` lint to warn for all cases where the first argument cannot be interpreted as a format string, as will happen in Rust 2021.
It suggests to add `"{}",` to format the message as a string. In the case of `std::panic!()`, it also suggests the recently stabilized
`std::panic::panic_any()` function as an alternative.
It renames the lint to `non_fmt_panic` to match the lint naming guidelines.
This is part of #80162.
r? ```@estebank```
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add test to ensure object-safety
This allows for runtime polymorphic allocators
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Add some links to the cell docs.
This adds a few links to the cell module docs to make it a little easier to navigate to the types and functions it references.
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Fixed formatting typo in map_while docs
changes `` ` None` `` to ``[`None`]`` for consistency
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Fix bug with assert!() calling the wrong edition of panic!().
The span of `panic!` produced by the `assert` macro did not carry the right edition. This changes `assert` to call the right version.
Also adds tests for the 2021 edition of panic and assert, that would've caught this.
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Add doc aliases for "delete"
This patch adds doc aliases for "delete". The added aliases are supposed to reference usages `delete` in other programming languages.
- `HashMap::remove`, `BTreeMap::remove` -> `Map#delete` and `delete` keyword in JavaScript.
- `HashSet::remove`, `BTreeSet::remove` -> `Set#delete` in JavaScript.
- `mem::drop` -> `delete` keyword in C++.
- `fs::remove_file`, `fs::remove_dir`, `fs::remove_dir_all`-> `File#delete` in Java, `File#delete` and `Dir#delete` in Ruby.
Before this change, searching for "delete" in documentation returned no results.
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Bump rustfmt version
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Also switches on formatting of the mir build module
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Implement `TrustedLen` for `Fuse<I: TrustedLen>`
This looks like it was simply forgotten.
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The span of `panic!` produced by the `assert` macro did not carry the
right edition. This changes `assert` to call the right version.
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Implement Rust 2021 panic
This implements the Rust 2021 versions of `panic!()`. See https://github.com/rust-lang/rust/issues/80162 and https://github.com/rust-lang/rfcs/pull/3007.
It does so by replacing `{std, core}::panic!()` by a bulitin macro that expands to either `$crate::panic::panic_2015!(..)` or `$crate::panic::panic_2021!(..)` depending on the edition of the caller.
This does not yet make std's panic an alias for core's panic on Rust 2021 as the RFC proposes. That will be a separate change: https://github.com/rust-lang/rust/pull/80879/commits/c5273bdfb266c35e8eab9413aa8d58d27fdbe114 That change is blocked on figuring out what to do with https://github.com/rust-lang/rust/issues/80846 first.
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This patch adds doc aliases for "delete". The added aliases are
supposed to reference usages `delete` in other programming
languages.
- `HashMap::remove`, `BTreeMap::remove` -> `Map#delete` and `delete`
keyword in JavaScript.
- `HashSet::remove`, `BTreeSet::remove` -> `Set#delete` in JavaScript.
- `mem::drop` -> `delete` keyword in C++.
- `fs::remove_file`, `fs::remove_dir`, `fs::remove_dir_all`
-> `File#delete` in Java, `File#delete` and `Dir#delete` in Ruby.
Before this change, searching for "delete" in documentation
returned no results.
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Clarify that InPlaceIterable guarantees extend to all advancing iterator methods.
A documentation update that should answer a question that came up in [this zulip discussion](https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Safety.20guarantees.20of.20InPlaceIterable/near/223743336)
CC `@SkiFire13`
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Optimize decimal formatting of 128-bit integers
## Description
This PR optimizes the `udivmod_1e19` function, which is used for formatting 128-bit integers, based on the algorithm provided in \[1\]. This optimization improves performance of formatting 128-bit integers, especially on 64-bit architectures. It also slightly reduces the output binary size.
## Assembler comparison
https://godbolt.org/z/YrG5zY
## Performance
#### previous results
```
test fmt::write_u128_max ... bench: 552 ns/iter (+/- 4)
test fmt::write_u128_min ... bench: 125 ns/iter (+/- 2)
```
#### new results
```
test fmt::write_u128_max ... bench: 205 ns/iter (+/- 13)
test fmt::write_u128_min ... bench: 129 ns/iter (+/- 5)
```
## Reference
\[1\] T. Granlund and P. Montgomery, “Division by Invariant Integers Using Multiplication” in Proc. of the SIGPLAN94 Conference on Programming Language Design and Implementation, 1994, pp. 61–72
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Remove requirement that forces symmetric and transitive PartialEq impls to exist
### Counterexample of symmetry:
If you [have](https://docs.rs/proc-macro2/1.0.24/proc_macro2/struct.Ident.html#impl-PartialEq%3CT%3E) an impl like:
```rust
impl<T> PartialEq<T> for Ident
where
T: ?Sized + AsRef<str>
```
then Rust will not even allow the symmetric impl to exist.
```console
error[E0210]: type parameter `T` must be covered by another type when it appears before the first local type (`Ident`)
--> src/main.rs:9:6
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9 | impl<T> PartialEq<Ident> for T where T: ?Sized + AsRef<str> {
| ^ type parameter `T` must be covered by another type when it appears before the first local type (`Ident`)
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= note: implementing a foreign trait is only possible if at least one of the types for which it is implemented is local, and no uncovered type parameters appear before that first local type
= note: in this case, 'before' refers to the following order: `impl<..> ForeignTrait<T1, ..., Tn> for T0`, where `T0` is the first and `Tn` is the last
```
<br>
### Counterexample of transitivity:
Consider these two existing impls from `regex` and `clap`:
```rust
// regex
/// An inline representation of `Option<char>`.
pub struct Char(u32);
impl PartialEq<char> for Char {
fn eq(&self, other: &char) -> bool {
self.0 == *other as u32
}
}
```
```rust
// clap
pub(crate) enum KeyType {
Short(char),
Long(OsString),
Position(u64),
}
impl PartialEq<char> for KeyType {
fn eq(&self, rhs: &char) -> bool {
match self {
KeyType::Short(c) => c == rhs,
_ => false,
}
}
}
```
It's nice to be able to add `PartialEq<proc_macro::Punct> for char` in libproc_macro (https://github.com/rust-lang/rust/pull/80595), but it makes no sense to force an `impl PartialEq<Punct> for Char` and `impl PartialEq<Punct> for KeyType` in `regex` and `clap` in code that otherwise has nothing to do with proc macros.
<br>
`@rust-lang/libs`
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Stabilize `core::slice::fill_with`
_Tracking issue: https://github.com/rust-lang/rust/issues/79221_
This stabilizes the `slice_fill_with` feature for Rust 1.51, following the stabilization of `slice_fill` in 1.50. This was requested by libs team members in https://github.com/rust-lang/rust/pull/79213.
This PR also adds the "memset" alias for `slice::fill_with`, mirroring the alias set on the `slice::fill` sibling API. This will ensure someone looking for "memset" will find both variants.
r? `@Amanieu`
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Stabilize by-value `[T; N]` iterator `core::array::IntoIter`
Tracking issue: https://github.com/rust-lang/rust/issues/65798
This is unblocked now that `min_const_generics` has been stabilized in https://github.com/rust-lang/rust/pull/79135.
This PR does *not* include the corresponding `IntoIterator` impl, which is https://github.com/rust-lang/rust/pull/65819. Instead, an iterator can be constructed through the `new` method.
`new` would become unnecessary when `IntoIterator` is implemented and might be deprecated then, although it will stay stable.
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Implement missing `AsMut<str>` for `str`
Allows `&mut str` to be taken by a Generic which requires `T` such that `T: AsMut<str>`. Motivating example:
```rust
impl<'i, T> From<T> for StructImmut<'i> where
T: AsRef<str> + 'i,
{
fn from(asref: T) -> Self {
let string: &str = asref.as_ref();
// ...
}
}
impl<'i, T> From<T> for StructMut<'i> where
T: AsMut<str> + 'i,
{
fn from(mut asmut: T) -> Self {
let string: &mut str = asmut.as_mut();
// ...
}
}
```
The Immutable form of this structure can be constructed by `StructImmut::from(s)` where `s` may be a `&String` or a `&str`, because `AsRef<str>` is implemented for `str`. However, the mutable form of the structure can be constructed in the same way **only** with a `&mut String`, and **not** with a `&mut str`.
This change does have some precedent, because as can be seen in [the Implementors](https://doc.rust-lang.org/std/convert/trait.AsMut.html#implementors), `AsMut<[T]>` is implemented for `[T]` as well as for `Vec<T>`, but `AsMut<str>` is implemented only for `String`. This would complete the symmetry.
As a trait implementation, this should be immediately stable.
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Slight simplification of chars().count()
Slight simplification: No need to call len(), we can just count the number of non continuation bytes.
I can't see any reason not to do this, can you?
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Stabilize `unsigned_abs`
Resolves #74913.
This PR stabilizes the `i*::unsigned_abs()` method, which returns the absolute value of an integer _as its unsigned equivalent_. This has the advantage that it does not overflow on `i*::MIN`.
I have gone ahead and used this in a couple locations throughout the repository.
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Stabilize raw ref macros
This stabilizes `raw_ref_macros` (https://github.com/rust-lang/rust/issues/73394), which is possible now that https://github.com/rust-lang/rust/issues/74355 is fixed.
However, as I already said in https://github.com/rust-lang/rust/issues/73394#issuecomment-751342185, I am not particularly happy with the current names of the macros. So I propose we also change them, which means I am proposing to stabilize the following in `core::ptr`:
```rust
pub macro const_addr_of($e:expr) {
&raw const $e
}
pub macro mut_addr_of($e:expr) {
&raw mut $e
}
```
The macro name change means we need another round of FCP. Cc `````@rust-lang/libs`````
Fixes #73394
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Add `core::stream::Stream`
[[Tracking issue: #79024](https://github.com/rust-lang/rust/issues/79024)]
This patch adds the `core::stream` submodule and implements `core::stream::Stream` in accordance with [RFC2996](https://github.com/rust-lang/rfcs/pull/2996). The RFC hasn't been merged yet, but as requested by the libs team in https://github.com/rust-lang/rfcs/pull/2996#issuecomment-725696389 I'm filing this PR to get the ball rolling.
## Documentatation
The docs in this PR have been adapted from [`std::iter`](https://doc.rust-lang.org/std/iter/index.html), [`async_std::stream`](https://docs.rs/async-std/1.7.0/async_std/stream/index.html), and [`futures::stream::Stream`](https://docs.rs/futures/0.3.8/futures/stream/trait.Stream.html). Once this PR lands my plan is to follow this up with PRs to add helper methods such as `stream::repeat` which can be used to document more of the concepts that are currently missing. That will allow us to cover concepts such as "infinite streams" and "laziness" in more depth.
## Feature gate
The feature gate for `Stream` is `stream_trait`. This matches the `#[lang = "future_trait"]` attribute name. The intention is that only the APIs defined in RFC2996 will use this feature gate, with future additions such as `stream::repeat` using their own feature gates. This is so we can ensure a smooth path towards stabilizing the `Stream` trait without needing to stabilize all the APIs in `core::stream` at once. But also don't start expanding the API until _after_ stabilization, as was the case with `std::future`.
__edit:__ the feature gate has been changed to `async_stream` to match the feature gate proposed in the RFC.
## Conclusion
This PR introduces `core::stream::{Stream, Next}` and re-exports it from `std` as `std::stream::{Stream, Next}`. Landing `Stream` in the stdlib has been a mult-year process; and it's incredibly exciting for this to finally happen!
---
r? `````@KodrAus`````
cc/ `````@rust-lang/wg-async-foundations````` `````@rust-lang/libs`````
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Fuse inner iterator in FlattenCompat and improve related tests
Fixes #81248
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Make more traits of the From/Into family diagnostic items
Following traits are now diagnostic items:
- `From` (unchanged)
- `Into`
- `TryFrom`
- `TryInto`
This also adds symbols for those items:
- `into_trait`
- `try_from_trait`
- `try_into_trait`
Related: https://github.com/rust-lang/rust-clippy/pull/6620#discussion_r562482587
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