Stabilize feature `cstr_from_bytes_until_nul`
This PR seeks to stabilize `cstr_from_bytes_until_nul`.
Partially addresses #95027
This function has only been on nightly for about 10 months, but I think it is simple enough that there isn't harm discussing stabilization. It has also had at least a handful of mentions on both the user forum and the discord, so it seems like it's already in use or at least known.
This needs FCP still.
Comment on potential discussion points:
- eventual conversion of `CStr` to be a single thin pointer: this function will still be useful to provide a safe way to create a `CStr` after this change.
- should this return a length too, to address concerns about the `CStr` change? I don't see it as being particularly useful, and it seems less ergonomic (i.e. returning `Result<(&CStr, usize), FromBytesUntilNulError>`). I think users that also need this length without the additional `strlen` call are likely better off using a combination of other methods, but this is up for discussion
- `CString::from_vec_until_nul`: this is also useful, but it doesn't even have a nightly implementation merged yet. I propose feature gating that separately, as opposed to blocking this `CStr` implementation on that
Possible alternatives:
A user can use `from_bytes_with_nul` on a slice up to `my_slice[..my_slice.iter().find(|c| c == 0).unwrap()]`. However; that is significantly less ergonomic, and is a bit more work for the compiler to optimize compared the direct `memchr` call that this wraps.
## New stable API
```rs
// both in core::ffi
pub struct FromBytesUntilNulError(());
impl CStr {
pub const fn from_bytes_until_nul(
bytes: &[u8]
) -> Result<&CStr, FromBytesUntilNulError>
}
```
cc ```@ericseppanen``` original author, ```@Mark-Simulacrum``` original reviewer, ```@m-ou-se``` brought up some issues on the thin pointer CStr
```@rustbot``` modify labels: +T-libs-api +needs-fcp
Rollup of 8 pull requests
Successful merges:
- #100599 (Add compiler error E0523 long description and test)
- #107471 (rustdoc: do not include empty default-settings tag in HTML)
- #107555 (Modify existing bounds if they exist)
- #107662 (Turn projections into copies in CopyProp.)
- #107695 (Add test for Future inflating arg size to 3x )
- #107700 (Run the tools builder on all PRs)
- #107706 (Mark 'atomic_mut_ptr' methods const)
- #107709 (Fix problem noticed in PR106859 with char -> u8 suggestion)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Fix suggestions rendering when the diff span is multiline
Fixes#92741
cc `@estebank`
I think, I finally fixed. I still want to go back and try to clean up the code a bit. I'm open to suggestions.
Some examples of the new suggestions:
```
help: consider removing the borrow
|
2 - &
|
```
```
help: consider removing the borrow
|
2 - &
3 - mut
|
```
```
help: consider removing the borrow
|
2 - &
3 - mut if true { true } else { false }
2 + if true { true } else { false }
|
```
Should we add a test to ensure this behavior doesn't disappear in the future?
Run `expand-yaml-anchors` in `x test tidy`
Previously, the pre-commit hook which runs `x test tidy` could pass only to have CI fail within the first 30 seconds. This adds about 30 seconds to `test tidy` (for an initial run, much less after the tool is built the first time) in exchange for catching errors in `.github/workflows/ci.yml` before they're pushed.
Adds the extended error documentation for E0523 to indicate that the
error is no longer produced by the compiler.
Update the E0464 documentation to include example code that produces the
error.
Remove the error message E0523 from the compiler and replace it with an
internal compiler error.
Previously, the pre-commit hook which runs `x test tidy` could pass only to have CI fail within the first 30 seconds.
This adds about 30 seconds to `test tidy` (for an initial run, much less after the tool is built the first time)
in exchange for catching errors in `.github/workflows/ci.yml` before they're pushed.
Implement epoll_wait
This PR continues working on https://github.com/rust-lang/miri/issues/602.
This is an implementation for `sleep`, though admittedly not a good one. It just does busy waiting.
Update cargo
18 commits in 3c5af6bed9a1a243a693e8e22ee2486bd5b82a6c..e84a7928d93a31f284b497c214a2ece69b4d7719 2023-01-24 15:48:15 +0000 to 2023-01-31 22:18:09 +0000
- chore: Add autolabel for `Command-*` labels (rust-lang/cargo#11664)
- Update cross test instructions for aarch64-apple-darwin (rust-lang/cargo#11663)
- Make cargo install report needed features (rust-lang/cargo#11647)
- docs(contrib): Remove out-of-date process step (rust-lang/cargo#11662)
- Do not error for `auth-required: true` without `-Z sparse-registry` (rust-lang/cargo#11661)
- Warn on commits to non-default branches. (rust-lang/cargo#11655)
- Avoid saving the same future_incompat warning multiple times (rust-lang/cargo#11648)
- Mention current default value in `publish.timeout` docs (rust-lang/cargo#11652)
- Make cargo aware of dwp files. (rust-lang/cargo#11572)
- Reduce target info rustc query calls (rust-lang/cargo#11633)
- Bump to 0.70.0; update changelog (rust-lang/cargo#11640)
- Enable sparse protocol in CI (rust-lang/cargo#11632)
- Fix split-debuginfo support detection (rust-lang/cargo#11347)
- refactor(toml): Move `TomlWorkspaceDependency` out of `TomlDependency` (rust-lang/cargo#11565)
- book: describe how the current resolver sometimes duplicates deps (rust-lang/cargo#11604)
- `cargo add` check `[dependencies]` order without considering the dotted item (rust-lang/cargo#11612)
- Link CoC to www.rust-lang.org/conduct.html (rust-lang/cargo#11622)
- Add more labels to triagebot (rust-lang/cargo#11621)
r? `@ghost`
make unaligned_reference a hard error
The `unaligned_references` lint has been warn-by-default since Rust 1.53 (https://github.com/rust-lang/rust/pull/82525) and deny-by-default with mention in cargo future-incompat reports since Rust 1.62 (https://github.com/rust-lang/rust/pull/95372). Current nightly will become Rust 1.66, so (unless major surprises show up with crater) I think it is time we make this a hard error, and close this old soundness gap in the language.
EDIT: Turns out this will only land for Rust 1.67, so there is another 6 weeks of time here for crates to adjust.
Fixes https://github.com/rust-lang/rust/issues/82523.
Bump bootstrap compiler to 1.68
This also changes our stage0.json to include the rustc component for the rustfmt pinned nightly toolchain, which is currently necessary due to rustfmt dynamically linking to that toolchain's librustc_driver and libstd.
r? `@pietroalbini`
