Add gha problem matcher
These regexes capture rustfmt errors, panics and regular Rust errors in CI and automatically add messages in the diff view. This should make it simpler to quickly see what went wrong without having to scroll through CI logs.
We can fine tune the regexes or add more matchers after having a look at how it actually works in practice
The relevant documentation can be found at https://github.com/actions/toolkit/blob/main/docs/problem-matchers.md
r? `@jyn514`
Don't consider TAIT normalizable to hidden ty if it would result in impossible item bounds
See test for example where we shouldn't consider it possible to alias-relate a TAIT and hidden type.
r? `@lcnr`
Add `alloc::rc::UniqueRc`
This PR implements `UniqueRc` as described in https://github.com/rust-lang/libs-team/issues/90.
I've tried to stick to the API proposed there, incorporating the feedback from the ACP review. For now I've just implemented `UniqueRc`, but we'll want `UniqueArc` as well. I wanted to get feedback on this implementation first since the `UniqueArc` version should be mostly a copy/paste/rename job.
This is an `Rc` that is guaranteed to only have one strong reference.
Because it is uniquely owned, it can safely implement `DerefMut`, which
allows programs to have an initialization phase where structures inside
the `Rc` can be mutated.
The `UniqueRc` can then be converted to a regular `Rc`, allowing sharing
and but read-only access.
During the "initialization phase," weak references can be created, but
attempting to upgrade these will fail until the `UniqueRc` has been
converted to a regular `Rc`. This feature can be useful to create
cyclic data structures.
This API is an implementation based on the feedback provided to the ACP
at https://github.com/rust-lang/libs-team/issues/90.
Don't ICE on bound var in `reject_fn_ptr_impls`
We may try to use an impl like `impl<T: FnPtr> PartialEq {}` to satisfy a predicate like `for<T> T: PartialEq` -- don't ICE in that case.
Fixes#112735
Treat TAIT equation as always ambiguous in coherence
Not sure why we weren't treating all TAIT equality as ambiguous -- this behavior combined with `DefineOpaqueTypes::No` leads to coherence overlap failures, since we incorrectly consider impls as not overlapping because the obligation `T: From<Foo>` doesn't hold.
Fixes#112765
Continue folding in query normalizer on weak aliases
Fixes#112752Fixes#112731 (same root cause, so didn't make a test for it)
fixes#112776
r? ```@oli-obk```
Rewrite various resolve/diagnostics errors as translatable diagnostics
additional question:
For trivial strings is it ever accepted to use `fluent_generated::foo` in a `label` for example? Or is an empty struct `Diagnostic` preferred?
Use BorrowFlag instead of explicit isize
The integer type tracking borrow count has a typedef called `BorrowFlag`. This type should be used instead of explicit `isize`.
[doc] `poll_fn`: explain how to `pin` captured state safely
Usage of `Pin::new_unchecked(&mut …)` is dangerous with `poll_fn`, even though the `!Unpin`-infectiousness has made things smoother. Nonetheless, there are easy ways to avoid the need for any `unsafe` altogether, be it through `Box::pin`ning, or the `pin!` macro. Since the latter only works within an `async` context, showing an example artificially introducing one ought to help people navigate this subtlety with safety and confidence.
## Preview
https://user-images.githubusercontent.com/9920355/230092494-da22fdcb-0b8f-4ff4-a2ac-aa7d9ead077a.mov
```@rustbot``` label +A-docs
Fixes 5686
For reference, explicit discriminants were proposed in [RFC-2363].
`ast::Variant` spans extend to include explicit discriminants when they
are present.
Now we'll adjust the span of enum variants to exclude any explicit
discriminant.
[RFC-2363]: https://rust-lang.github.io/rfcs/2363-arbitrary-enum-discriminant.html
Fixes 5729
`parse_attribute` will panic if the first token is not a `#`. To prevent
this we return early instead of trying to parse an invalid attribute.
`#[test]` function signature verification improvements
This PR contains two improvements to the expansion of the `#[test]` macro.
The first one fixes https://github.com/rust-lang/rust/issues/112360 by correctly recovering item statements if the signature verification fails.
The second one forbids non-lifetime generics on `#[test]` functions. These were previously allowed if the function returned `()`, but always caused an inference error:
before:
```text
error[E0282]: type annotations needed
--> src/lib.rs:2:1
|
1 | #[test]
| ------- in this procedural macro expansion
2 | fn foo<T>() {}
| ^^^^^^^^^^^^^^ cannot infer type
```
after:
```text
error: functions used as tests can not have any non-lifetime generic parameters
--> src/lib.rs:2:1
|
2 | fn foo<T>() {}
| ^^^^^^^^^^^^^^
```
Also includes some basic tests for test function signature verification, because I couldn't find any (???) in the test suite.
