Use `const_error!` when possible
Replace usages of `io::Error::new(io::ErrorKind::Variant, "constant string")` with `io::const_error!(io::ErrorKind::Variant, "constant string")` to avoid allocations when possible. Additionally, fix `&&str` error messages in SGX and missing/misplaced trailing commas in `const_error!`.
Apply unsafe_op_in_unsafe_fn to the standard library
This applies unsafe_op_in_unsafe_fn to the standard library in preparation for updating to Rust 2024.
Closes https://github.com/rust-lang/rust/issues/127747 (I think?) cc ``@workingjubilee``
I have been testing a variety of targets, and I feel like they are all pretty much covered. I'll continue doing some testing async, but I don't expect to catch any more.
Forward all default methods for I/O impls
Forward all default methods for `&mut T` and `Box<T>` to the inner `io::Read`, `io::Write`, `io::Seek`, and `io::BufRead` types.
Windows: Update generated bindings
Update to windows-bindgen 0.59.
This update is aimed at reducing churn in the future, but means a bit more churn now:
- `bindings.txt` no longer needs us to write the namespace for each item. This is good because it means in the future we won't need to change them if the namespace changes. However, there are a few where we still need to disambiguate due to duplicate items (this is a bug in the upstream metadata).
- The output in `windows-sys.rs` is now sorted. It was mostly sorted before but not intentionally. This should mean future changes are less noisy.
The actual code changes are minimal here. A few types are now `bool` instead of `BOOLEAN`, which is more convenient.
Implement Extend<AsciiChar> for String
Implement `Extend<AsciiChar>` for `String` as suggested in https://github.com/rust-lang/rust/issues/110998#issuecomment-2590122968. Also implements `Extend<&AsciiChar>` since there's an analogous impl for `Extend<&char>`, but happy to remove if not thought useful.
r? `@scottmcm`
since you requested it, but no pressure to review!
Prepare standard library for Rust 2024 migration
This includes a variety of commits preparing the standard library for migration to Rust 2024.
The actual migration is blocked on a few things, so I wanted to get this out of the way in a relatively digestable PR.
Stabilize `const_is_char_boundary` and `const_str_split_at`.
Tracking issues: #131516, #131518
Stabilized const API:
```rs
// in `core`
impl str {
// const_is_char_boundary feature
const fn is_char_boundary(&self, index: usize) -> bool;
// const_str_split_at feature, depends on const_is_char_boundary
const fn split_at(&self, mid: usize) -> (&str, &str);
const fn split_at_mut(&mut self, mid: usize) -> (&mut str, &mut str);
const fn split_at_checked(&self, mid: usize) -> Option<(&str, &str)>;
const fn split_at_mut_checked(&mut self, mid: usize) -> Option<(&mut str, &mut str)>;
}
```
This will allow safely splitting string slices during const-eval.
Closes#131516, Closes#131518
This will need FCP.
r? libs-api
IIUC these do not use any new const language features (i.e. they are implementable manually on stable 1.83.0 using `unsafe`: [playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=3679632cd1041084796241b7ac8edfbd)).
Cc ``@rust-lang/wg-const-eval`` (I don't know if I have the permissions for this ping; if not, someone else please ping wg-const-eval if it is necessary)
These functions were changed to be safe in
https://github.com/rust-lang/rust/pull/127763, but this particular UWP
version was missed. Otherwise this causes unnecessary unsafe block
warnings/errors.
alloc boxed: docs: use MaybeUninit::write instead of as_mut_ptr
In the deferred initialization pattern, the docs were needlessly going through `as_mut_ptr().write()` to initialize, which is unnecessary use of a pointer, needs to be inside an `unsafe` block, and may weaken alias analysis.
Remove the common prelude module
This fixes the issues described in https://github.com/rust-lang/rust/issues/136102. Primarily, this resolves some issues with how the documentation for the prelude is generated:
- It avoids showing "unstable" for macros in the prelude that are actually stable.
- Avoids duplication of some pages due to the previous lack of `doc(no_inline)`.
- Makes the different edition preludes consistent, and sets a pattern that can be used by future editions.
We may need to rearrange these modules in the future if we decide to remove anything from the prelude again. If we do, I think we should look into a different solution that avoids the documentation problems.
Closes https://github.com/rust-lang/rust/issues/136102
`transmute` should also assume non-null pointers
Previously it only did integer-ABI things, but this way it does data pointers too. That gives more information in general to the backend, and allows slightly simplifying one of the helpers in slice iterators.
[AIX] expect `EINVAL` for `pthread_mutex_destroy`
Calling `pthread_mutex_destory` on a mutex initalized with the static initializer macro `PTHREAD_MUTEX_INITIALIZER` will result in `EINVAL` if the mutex is not lock/unlocked prior to calling `pthread_mutex_destroy`.
This generates a warning of irrefutable patterns. I decided to slightly
tweak the example so the closure returns unit, since the intent wasn't
to show the weird behavior of returning `!`.
A small workaround for https://github.com/rust-lang/rust/issues/136899,
rustdoc's invalid_rust_codeblocks was not handling this well in 2024.
This may be needed when migrating to 2024 when building with stage0.
In the deferred initialization pattern, the docs were needlessly going
through as_mut_ptr().write() to initialize, which is unnecessary use of
a pointer, needs to be inside an unsafe block, and may weaken alias
analysis.
