Make const panic!("..") work in Rust 2021.
During const eval, this replaces calls to core::panicking::panic_fmt and std::panicking::being_panic_fmt with a call to a new const fn: core::panicking::const_panic_fmt. That function uses fmt::Arguments::as_str() to get the str and calls panic_str with that instead.
panic!() invocations with formatting arguments are still not accepted, as the creation of such a fmt::Arguments cannot be done in constant functions right now.
r? `@RalfJung`
Create `QuerySideEffects` and use it for diagnostics
The code for saving and loading diagnostics during execution is generalized to handle a new `QuerySideEffects` struct. Currently, this struct just holds diagnostics - in a follow-up PR, I plan to add support for storing attriutes marked as used during query execution.
This is a pure refactor, with no intended behavior changes.
Remove unsound TrustedRandomAccess implementations
Removes the implementations that depend on the user-definable trait `Copy`.
Fixes#85873 in the most straightforward way.
<hr>
_Edit:_ This PR now contains additional trait infrastructure to avoid performance regressions around in-place collect, see the discussion in this thread starting from the codegen test failure at https://github.com/rust-lang/rust/pull/85874#issuecomment-872327577.
With this PR, `TrustedRandomAccess` gains additional documentation that specifically allows for and specifies the safety conditions around subtype coercions – those coercions can happen in safe Rust code with the `Zip` API’s usage of `TrustedRandomAccess`. This PR introduces a new supertrait of `TrustedRandomAccess`(currently named `TrustedRandomAccessNoCoerce`) that _doesn’t allow_ such coercions, which means it can be still be useful for optimizing cases such as in-place collect where no iterator is handed out to a user (who could do coercions) after a `get_unchecked` call; the benefit of the supertrait is that it doesn’t come with the additional safety conditions around supertraits either, so it can be implemented for more types than `TrustedRandomAccess`.
The `TrustedRandomAccess` implementations for `vec::IntoIter`, `vec_deque::IntoIter`, and `array::IntoIter` are removed as they don’t conform with the newly documented safety conditions, this way unsoundness is removed. But this PR in turn (re-)adds a `TrustedRandomAccessNoCoerce` implementation for `vec::IntoIter` to avoid performance regressions from stable in a case of in-place collecting of `Vec`s [the above-mentioned codegen test failure]. Re-introducing the (currently nightly+beta-only) impls for `VecDeque`’s and `[T; N]`’s iterators is technically possible, but goes beyond the scope of this PR (i.e. it can happen in a future PR).
The examples added in #60396 used a "clever" post-increment hack,
unrelated to the actual point of the examples. That hack was found
[confusing] in the users forum, and #81811 already changed the `Vec`
example to use a more direct iterator. This commit changes `String` and
`VecDeque` in the same way for consistency.
[confusing]: https://users.rust-lang.org/t/help-understand-strange-expression/62858
Rollup of 10 pull requests
Successful merges:
- #81050 (Stabilize core::task::ready!)
- #81363 (Remove P: Unpin bound on impl Future for Pin)
- #86839 (Add doc aliases to fs.rs)
- #87435 (fix example code for E0617)
- #87451 (Add support for tuple struct field documentation)
- #87491 (Integrate context into the memorial to Anna)
- #87521 (Add long explanation for E0498)
- #87527 (Don't run MIR unsafeck at all when using `-Zthir-unsafeck`)
- #87550 (Add `CI_ONLY_WHEN_CHANNEL` and run `x86_64-gnu-stable` only on nightly)
- #87565 (Use backticks when referring to `core::future::Ready` in panic message)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
Integrate context into the memorial to Anna
This came up after I reviewed https://github.com/rust-lang/rust/pull/87298, but I didn't propose this in time before that PR was merged.
If y'all feel this is too much churn on the file, no worries, feel free to close, but I felt this was a more fitting integration of the memorial into the test suite.
CC ``@boringcactus.``
Add support for tuple struct field documentation
Fixes #42615.
This is #80320 updated to new codebase and with added tests.
Part of https://github.com/rust-lang/rust/issues/83255.
cc ```@camelid``` (since you were involved on the original PR).
r? ```@jyn514```
Remove P: Unpin bound on impl Future for Pin
We can safely produce a `Pin<&mut P::Target>` without moving out of the `Pin` by using `Pin::as_mut` directly.
The `Unpin` bound was originally added in #56939 following the recommendation of ``@withoutboats`` in https://github.com/rust-lang/rust/issues/55766#issue-378417538
That comment does not give explicit justification for why the bound should be added. The relevant context was:
> [ ] Remove `impl<P> Unpin for Pin<P>`
>
> This impl is not justified by our standard justification for unpin impls: there is no pointer direction between `Pin<P>` and `P`. Its usefulness is covered by the impls for pointers themselves.
>
> This futures impl (link to the impl changed in this PR) will need to change to add a `P: Unpin` bound.
The decision to remove the unconditional impl of `Unpin for Pin` is sound (these days there is just an auto-impl for when `P: Unpin`). But, I think the decision to also add the `Unpin` bound for `impl Future` may have been unnecessary. Or if that's not the case, I'd be very interested to have the argument for why written down somewhere. The bound _appears_ to not be needed, as demonstrated by the change requiring no unsafe code and by the existence of `Pin::as_mut`.
Stabilize core::task::ready!
_Tracking issue: https://github.com/rust-lang/rust/issues/70922_
This PR stabilizes the `task::ready!` macro. Similar to https://github.com/rust-lang/rust/pull/80886, this PR was waiting on https://github.com/rust-lang/rust/issues/74355 to be fixed.
The `task::ready!` API has existed in the futures ecosystem for several years, and was added on nightly last year in https://github.com/rust-lang/rust/pull/70817. The motivation for this macro is the same as it was back then: virtually every single manual future implementation makes use of this; so much so that it's one of the few things included in the [futures-core](https://docs.rs/futures-core/0.3.12/futures_core) library.
r? ``@tmandry``
cc/ ``@rust-lang/wg-async-foundations`` ``@rust-lang/libs``
## Example
```rust
use core::task::{Context, Poll};
use core::future::Future;
use core::pin::Pin;
async fn get_num() -> usize {
42
}
pub fn do_poll(cx: &mut Context<'_>) -> Poll<()> {
let mut f = get_num();
let f = unsafe { Pin::new_unchecked(&mut f) };
let num = ready!(f.poll(cx));
// ... use num
Poll::Ready(())
}
```
During const eval, this replaces calls to core::panicking::panic_fmt and
std::panicking::being_panic_fmt with a call to a new const fn:
core::panicking::const_panic_fmt. That function uses
fmt::Arguments::as_str() to get the str and calls panic_str with that
instead.
panic!() invocations with formatting arguments are still not accepted,
as the creation of such a fmt::Arguments cannot be done in constant
functions right now.
Rollup of 3 pull requests
Successful merges:
- #7279 (Adapting the lint list to Clippy's new metadata format)
- #7298 (Switch CI to new metadata collection)
- #7420 (Update lint documentation to use markdown headlines)
Failed merges:
r? `@ghost`
`@rustbot` modify labels: rollup
changelog: rollup
Update lint documentation to use markdown headlines
This PR updates all lint documentation to use markdown headlines. It additionally removed the *Known problems* section for lints without any problems. I've double-checked all automatic replacements, but a second pair of eyes is definitely appreciated!
I wasn't sure when you wanted to switch to the new metadata collection tomorrow, I therefore prepared this PR today. And that's it this is a standalone PR to keep the other related PRs reviewable.
changelog: none
r? `@flip1995`
cc: #7172
Note: This should be merged with the other metadata collection related PRs.
Switch CI to new metadata collection
r? `@xFrednet`
Things we have to keep in mind:
- This removes the template files and the scripts used for deployment from the checkout. This was added in #5517. I don't think we ever needed those there. Not sure though.
- ~~As a result, we can't remove the python scripts yet. We have to wait until this hits a stable Clippy release.~~ I'll just break the next stable deploy and do it by hand once.
- This should be merged together with #7279. Me and `@xFrednet` will coordinate the switch
- ...?
I still have to try out some things:
- [x] Is it worth caching? Yes
- [x] ~~Is it worth to do a release build?~~ Nope
- [x] Does it actually work? With a few changes, yes
- [ ] ...?
changelog: Clippy now uses a lint to generate its documentation 🎉
Adapting the lint list to Clippy's new metadata format
This is close to the end of a long living project to rewrite the lint metadata collection for Clippy. Progress on this has been tracked in #7172. This PR adds one of the last missing puzzle pieces, the actual display of all the changes that have been done in the background. A preview can be seen here: [Clippy's lint list](https://xfrednet.github.io/rust-clippy/master/index.html)
The styling has been discussed on [zulip](https://rust-lang.zulipchat.com/#narrow/stream/257328-clippy/topic/Styling.20feedback.20for.20Clippy's.20lint.20list/near/239601067) but is still open to suggestion.
Side note: It has been fun working on the website where we don't have unit tests and everything is just tested by playing around. However, it's good that this chaos is contained into this one part of Clippy. 🐛
---
Closes: #1303Closes: #4310
This actually closes fewer things than I thought it would...
changelog: Reworked Clippy's [website](https://rust-lang.github.io/rust-clippy/master/index.html):
changelog: * Added applicability information about lints
changelog: * Added a link to jump to the specific lint implementation
changelog: * Adapted some styling and improved loading time
r? `@flip1995`
Changes included:
- Minimum adaption to the new `lints.json` format
- Fixing filtering for the new `lints.json` format; hardcoding the
lint groups in the index
- Recreating the original doc styling for the new format
- Fixed sytax highlighting for rust,ignore code blocks
- Fixed markdown table extraction in the metadata collector and
fixed lint level output
- Adding the additional information row for lints
- Changed the website title to Clippy's lint list
- Flexing the website for mobile users
- Added (?) references for lint levels and groups
- Making deprecated lints look dead
- Removed JS code block language extraction in favor of a rust
implementation `rust-clippy#7352`
- Added the suspicious lint group to the lint list
- Remove trailing whitespaces from index.html
- Fix code highlighting
- Use default value if the docVersion is empty
Co-authored-by: Philipp Krones <hello@philkrones.com>
These functions can panic for some types. This makes the panic point to
the code that calls e.g. mem::uninitialized(), instead of inside the
definition of mem::uninitialized.
