Rollup of 4 pull requests #66184
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Rollup of 4 pull requests #66184
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Add ERROR Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>
Co-Authored-By: Mazdak Farrokhzad <twingoow@gmail.com>
…, r=kinnison [rustdoc] add sub settings This PR is to give a finer control over what types are automatically expanded or not as well as the possibility to add sub-settings in the settings page.  r? @Mark-Simulacrum
Stabilize --extern flag without a path. This stabilizes the `--extern` flag without a path, implemented in rust-lang#54116. This flag is used to add a crate that may be found in the search path to the extern prelude. The intent of stabilizing this now is to change Cargo to emit this flag for `proc_macro` when building a proc-macro crate. This will allow the ability to elide `extern crate proc_macro;` for proc-macros, one of the few places where it is still necessary. It is intended that Cargo may also use this flag for other cases in the future as part of the [std-aware work](https://github.com/rust-lang/wg-cargo-std-aware/). There will likely be some kind of syntax where users may declare dependencies on other crates (such as `alloc`), and Cargo will use this flag so that they may be used like any other crate. At this time there are no short-term plans to use it for anything other than proc-macro. This will not help for non-proc-macro crates that use `proc_macro`, which I believe is not too common? An alternate approach for proc-macro is to use the `meta` crate, but from my inquiries there doesn't appear to be anyone interested in pushing that forward. The `meta` crate also doesn't help with things like `alloc` or `test`. cc rust-lang#57288
…nieu
Add `MaybeUninit` methods `uninit_array`, `slice_get_ref`, `slice_get_mut`
Eventually these will hopefully become the idiomatic way to work with partially-initialized stack buffers.
All methods are unstable. Note that `uninit_array` takes a type-level `const usize` parameter, so it is blocked (at least in its current form) on const generics.
Example:
```rust
use std::mem::MaybeUninit;
let input = b"Foo";
let f = u8::to_ascii_uppercase;
let mut buffer: [MaybeUninit<u8>; 32] = MaybeUninit::uninit_array();
let vec;
let output = if let Some(buffer) = buffer.get_mut(..input.len()) {
buffer.iter_mut().zip(input).for_each(|(a, b)| { a.write(f(b)); });
unsafe { MaybeUninit::slice_get_ref(buffer) }
} else {
vec = input.iter().map(f).collect::<Vec<u8>>();
&vec
};
assert_eq!(output, b"FOO");
```
invalid_value lint: fix help text Now that we also warn about `MaybUninit::uninit().assume_init()`, just telling people "use `MaybeUninit`" isn't always sufficient. And anyway this seems like an important enough point to mention it here.
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Successful merges:
MaybeUninitmethodsuninit_array,slice_get_ref,slice_get_mut#65580 (AddMaybeUninitmethodsuninit_array,slice_get_ref,slice_get_mut)Failed merges:
r? @ghost