add diagnostic items for clippy's `trim_split_whitespace`
Adding the following diagnostic items:
* str_split_whitespace,
* str_trim,
* str_trim_start,
* str_trim_end
They are needed for https://github.com/rust-lang/rust-clippy/pull/8575
r? `@flip1995`
add module-level documentation for vec's in-place iteration
As requested in the last libs team meeting and during previous reviews.
Feel free to point out any gaps you encounter, after all non-obvious things may with hindsight seem obvious to me.
r? `@yaahc`
CC `@steffahn`
Rename `~const Drop` to `~const Destruct`
r? `@oli-obk`
Completely switching to `~const Destructible` would be rather complicated, so it seems best to add it for now and wait for it to be backported to beta in the next release.
The rationale is to prevent complications such as #92149 and #94803 by introducing an entirely new trait. And `~const Destructible` reads a bit better than `~const Drop`. Name Bikesheddable.
Add u16::is_utf16_surrogate
Right now, there are methods in the standard library for encoding and decoding UTF-16, but at least for the moment, there aren't any methods specifically for `u16` to help work with UTF-16 data. Since the full logic already exists, this wouldn't really add any code, just expose what's already there.
This method in particular is useful for working with the data returned by Windows `OsStrExt::encode_wide`. Initially, I was planning to also offer a `TryFrom<u16> for char`, but decided against it for now. There is plenty of code in rustc that could be rewritten to use this method, but I only checked within the standard library to replace them.
I think that offering more UTF-16-related methods to u16 would be useful, but I think this one is a good start. For example, one useful method might be `u16::is_pattern_whitespace`, which would check if something is the Unicode `Pattern_Whitespace` category. We can get away with this because all of the `Pattern_Whitespace` characters are in the basic multilingual plane, and hence we don't need to check for surrogates.
Provide more useful documentation of conversion methods
I thought that the documentation for these methods needed to be a bit more explanatory for new users. For advanced users, the comments are relatively unnecessary. I think it would be useful to explain precisely what the method does. As a new user, when you see the `into` method, where the type is inferred, if you are new you don't even know what you convert to, because it is implicit. I believe this can help new users understand.
I thought that the documentation for these methods needed to be a bit more explanatory for new users. For advanced users, the comments are relatively unnecessary. I think it would be useful to explain precisely what the method does. As a new user, when you see the `into` method, where the type is inferred, if you are new you don't even know what you convert to, because it is implicit. I believe this can help new users understand.
Document that `Option<extern "abi" fn>` discriminant elision applies for any ABI
The current phrasing was not very clear on that aspect.
r? `@RalfJung`
`@rustbot` modify labels: A-docs A-ffi
Derive Eq for std::cmp::Ordering, instead of using manual impl.
This allows consts of type Ordering to be used in patterns, and with feature(adt_const_params) allows using `Ordering` as a const generic parameter.
Currently, `std::cmp::Ordering` implements `Eq` using a manually written `impl Eq for Ordering {}`, instead of `derive(Eq)`. This means that it does not implement `StructuralEq`.
This commit removes the manually written impl, and adds `derive(Eq)` to `Ordering`, so that it will implement `StructuralEq`.
Let `try_collect` take advantage of `try_fold` overrides
No public API changes.
With this change, `try_collect` (#94047) is no longer going through the `impl Iterator for &mut impl Iterator`, and thus will be able to use `try_fold` overrides instead of being forced through `next` for every element.
Here's the test added, to see that it fails before this PR (once a new enough nightly is out): https://play.rust-lang.org/?version=nightly&mode=debug&edition=2021&gist=462f2896f2fed2c238ee63ca1a7e7c56
This might as well go to the same person as my last `try_process` PR (#93572), so
r? ``@yaahc``
Stabilize ADX target feature
This is a continuation of #60109, which noted that while the ADX intrinsics were stabilized, the corresponding target feature never was.
This PR follows the same general structure and stabilizes the ADX target feature.
See also https://github.com/rust-lang/rust/issues/44839 - tracking issue for target feature
Format core and std macro rules, removing needless surrounding blocks
Many of the asserting and printing macros in `core` and `std` are written with prehistoric-looking formatting, like this:
335ffbfa54/library/std/src/macros.rs (L96-L101)
In modern Rust style this would conventionally be written as follows instead, always using braces and a trailing semicolon on the macro arms:
af53809c87/library/std/src/macros.rs (L98-L105)
Getting rid of the unneeded braces inside the expansion reduces extraneous indentation in macro-expanded code. For example:
```rust
println!("repro {}", true);
```
```rust
// before:
{
::std::io::_print(
::core::fmt::Arguments::new_v1(
&["repro ", "\n"],
&[::core::fmt::ArgumentV1::new_display(&true)],
),
);
};
```
```rust
// after:
::std::io::_print(
::core::fmt::Arguments::new_v1(
&["repro ", "\n"],
&[::core::fmt::ArgumentV1::new_display(&true)],
),
);
```
This is a continuation of #60109, which noted that while the ADX
intrinsics were stabilized, the corresponding target feature never was.
This PR follows the same general structure and stabilizes the ADX target
feature.
