Add #[rustc_box] and use it inside alloc
This commit adds an alternative content boxing syntax, and uses it inside alloc.
```Rust
#![feature(box_syntax)]
fn foo() {
let foo = box bar;
}
```
is equivalent to
```Rust
#![feature(rustc_attrs)]
fn foo() {
let foo = #[rustc_box] Box::new(bar);
}
```
The usage inside the very performance relevant code in
liballoc is the only remaining relevant usage of box syntax
in the compiler (outside of tests, which are comparatively easy to port).
box syntax was originally designed to be used by all Rust
developers. This introduces a replacement syntax more tailored
to only being used inside the Rust compiler, and with it,
lays the groundwork for eventually removing box syntax.
[Earlier work](https://github.com/rust-lang/rust/pull/87781#issuecomment-894714878) by `@nbdd0121` to lower `Box::new` to `box` during THIR -> MIR building ran into borrow checker problems, requiring the lowering to be adjusted in a way that led to [performance regressions](https://github.com/rust-lang/rust/pull/87781#issuecomment-894872367). The proposed change in this PR lowers `#[rustc_box] Box::new` -> `box` in the AST -> HIR lowering step, which is way earlier in the compiler, and thus should cause less issues both performance wise as well as regarding type inference/borrow checking/etc. Hopefully, future work can move the lowering further back in the compiler, as long as there are no performance regressions.
[1/N] Implement Arithmetic lint
Assuming that https://github.com/rust-lang/rust-clippy/issues/8903 is OK, this PR starts the creation of the `Arithmetic` lint with configurable types.
My current struggle to get a rustc review inspired me to create smaller PRs in order to easy review and make merges as fast as possible. So the first step here only moves the `arithmetic.rs` file to `numeric_arithmetic.rs` to make room for the new lint.
--
changelog: none
Diagnose anonymous lifetimes errors more uniformly between async and regular fns
Async fns and regular fns are desugared differently. For the former, we create a generic parameter at HIR level. For the latter, we just create an anonymous region for typeck.
I plan to migrate regular fns to the async fn desugaring.
Before that, this PR attempts to merge the diagnostics for both cases.
r? ```@estebank```
Apply track_caller to closure on `expect_non_local()`
r? `@petrochenkov`
Alternatively we could remove the closure by replicating the same logic of `map_id()`. I'm happy to switch to it if you'd like.
Add Windows application manifest to rustc-main
Windows allows setting some runtime options using a manifest file. The format of the XML file is documented here: https://docs.microsoft.com/en-us/windows/win32/sbscs/application-manifests
The manifest file in this PR does three things:
* Declares which Windows versions we support. This may help avoid unnecessary compatibility shims.
* Uses the UTF-8 code page. While Rust itself uses UTF-16 APIs, other code may rely on the code page.
* Makes the application long path aware (if also enabled by the user). This allows for the current directory to be longer than `PATH_MAX`.
These changes only affect the `rustc` process and not any other DLLs or compiled programs.
Make docs more consistent
changelog: none
This just fixes some docs to make them more consistent. I mostly just changed `// Good`, `// Bad`, etc to `Use instead:`.
The change was "Show invisible delimiters (within comments) when pretty
printing". It's useful to show these delimiters, but is a breaking
change for some proc macros.
Fixes#97608.
rename PointerAddress → PointerExposeAddress
`PointerAddress` sounds a bit too much like `ptr.addr()`, but this corresponds to `ptr.expose_addr()`.
r? `@tmiasko`
Move conditions out of recover/report functions.
`Parser` has six recover/report functions that are passed a boolean, and
nothing is done if the boolean has a particular value.
This PR moves the tests outside the functions. This has the following effects.
- The number of lines of code goes down.
- Some `use` items become shorter.
- Avoids the strangeness whereby 11 out of 12 calls to
`maybe_recover_from_bad_qpath` pass `true` as the second argument.
- Makes it clear at the call site that only one of
`maybe_recover_from_bad_type_plus` and `maybe_report_ambiguous_plus` will be
run.
r? `@estebank`
Additional `*mut [T]` methods
Split out from #94247
This adds the following methods to raw slices that already exist on regular slices
* `*mut [T]::is_empty`
* `*mut [T]::split_at_mut`
* `*mut [T]::split_at_mut_unchecked`
These methods reduce the amount of unsafe code needed to migrate `ChunksMut` and related iterators
to raw slices (#94247)
r? `@m-ou-se`
Update cargo
5 commits in 39ad1039d9e3e1746177bf5d134af4c164f95528..38472bc19f2f76e245eba54a6e97ee6821b3c1db
2022-05-25 00:50:02 +0000 to 2022-05-31 02:03:24 +0000
- Emit warning upon encountering multiple packages with the same name (rust-lang/cargo#10701)
- Guide new users to add use `super::*;` to `mod test` (rust-lang/cargo#10706)
- Document how to debug change detection events (rust-lang/cargo#10708)
- fix(publish): add more check when use `publish -p <SPEC>` (rust-lang/cargo#10677)
- fix key formatting when switching to a dotted `WorkspaceSource` (rust-lang/cargo#10705)
Set correct `ParamEnv` for `derive_partial_eq_without_eq`
fixes#8867
changelog: Handle differing predicates applied by `#[derive(PartialEq)]` and `#[derive(Eq)]` in `derive_partial_eq_without_eq`
