Revert stabilization of trait_upcasting feature
Reverts #118133
This reverts commit 6d2b84b3ed, reversing changes made to 73bc12199e.
The feature has a soundness bug:
* #120222
It is unclear to me whether we'll actually want to destabilize, but I thought it was still prudent to open the PR for easy destabilization once we get there.
Track `verbose` and `verbose_internals`
`verbose_internals` has been UNTRACKED since it was introduced. When i added `verbose` in https://github.com/rust-lang/rust/pull/119129 i made it UNTRACKED as well.
``@bjorn3`` says: https://github.com/rust-lang/rust/pull/119286#discussion_r1436134354
> On errors we don't finalize the incr comp cache, but non-fatal diagnostics are cached afaik.
Otherwise we would have to replay the query in question, which we may not be able to do if the query key is not reconstructible from the dep node fingerprint.
So we must track these flags to avoid replaying incorrect diagnostics.
r? incremental
never_patterns: Count `!` bindings as diverging
A binding that is a never pattern is not reachable, hence counts as diverging code. This allows in particular `fn foo(!: Void) -> SomeType {}` to typecheck.
r? ``@compiler-errors``
Rollup of 10 pull requests
Successful merges:
- #117910 (Refactor uses of `objc_msgSend` to no longer have clashing definitions)
- #118639 (Undeprecate lint `unstable_features` and make use of it in the compiler)
- #119801 (Fix deallocation with wrong allocator in (A)Rc::from_box_in)
- #120058 (bootstrap: improvements for compiler builds)
- #120059 (Make generic const type mismatches not hide trait impls from the trait solver)
- #120097 (Report unreachable subpatterns consistently)
- #120137 (Validate AggregateKind types in MIR)
- #120164 (`maybe_lint_impl_trait`: separate `is_downgradable` from `is_object_safe`)
- #120181 (Allow any `const` expression blocks in `thread_local!`)
- #120218 (rustfmt: Check that a token can begin a nonterminal kind before parsing it as a macro arg)
r? `@ghost`
`@rustbot` modify labels: rollup
`maybe_lint_impl_trait`: separate `is_downgradable` from `is_object_safe`
https://github.com/rust-lang/rust/pull/119752 leveraged and overloaded `is_object_safe` to prevent an ICE, but accurate object safety information is needed for precise suggestions. This separates out `is_downgradable`, used for the ICE prevention, and `is_object_safe`, which returns to its original meaning.
Report unreachable subpatterns consistently
We weren't reporting unreachable subpatterns in function arguments and `let` expressions. This wasn't very important, but never patterns make it more relevant: a user might write `let (Ok(x) | Err(!)) = ...` in a case where `let Ok(x) = ...` is accepted, so we should report the `Err(!)` as redundant.
r? ```@compiler-errors```
Make generic const type mismatches not hide trait impls from the trait solver
pulled out of https://github.com/rust-lang/rust/pull/119895
It does improve diagnostics somewhat, but also causes some extraneous diagnostics in potentially misleading order.
The issue was that a const type mismatch, instead of reporting an error, would silently poison the constant, only for that information to be thrown away and the impl to be treated as "not matching". In #119895 this would cause ICEs as well as errors on impls stating that the impl needs to exist for itself to be valid.
Don't actually make bound ty/const for RTN
Avoid creating an unnecessary non-lifetime binder when we do RTN on a method that has ty/const params.
Fixes#120208
r? oli-obk
add help message for `exclusive_range_pattern` error
Fixes#120047
this error
```
error[E0658]: exclusive range pattern syntax is experimental
--> src/lib.rs:3:9
|
3 | 0..42 => {},
| ^^^^^
|
= note: see issue #37854 <https://github.com/rust-lang/rust/issues/37854> for more information
= help: use an inclusive range pattern, like N..=M
```
now includes a help message
Not sure of proper procedure here but this seemed like a good help message (used the one suggested in the original issue), if you have a idea for one that is better or something I missed please comment!
exclude unexported macro bindings from extern crate
Fixes#119301
Macros that aren't exported from an external crate should not be defined.
r? ``@petrochenkov``
Rollup of 9 pull requests
Successful merges:
- #118714 ( Explanation that fields are being used when deriving `(Partial)Ord` on enums)
- #119710 (Improve `let_underscore_lock`)
- #119726 (Tweak Library Integer Division Docs)
- #119746 (rustdoc: hide modals when resizing the sidebar)
- #119986 (Fix error counting)
- #120194 (Shorten `#[must_use]` Diagnostic Message for `Option::is_none`)
- #120200 (Correct the anchor of an URL in an error message)
- #120203 (Replace `#!/bin/bash` with `#!/usr/bin/env bash` in rust-installer tests)
- #120212 (Give nnethercote more reviews)
r? `@ghost`
`@rustbot` modify labels: rollup
Make stable_mir::with_tables sound
See the first commit for the actual soundness fix. The rest is just fallout from that and is entirely safe code. Includes most of #120120
The major difference to #120120 is that we don't need an unsafe trait, as we can now rely on the type system (the only unsafe part, and the actual source of the unsoundness was in `with_tables`)
r? `@celinval`
coverage: Format all coverage tests with `rustfmt`
As suggested by <https://github.com/rust-lang/rust/pull/119984#discussion_r1452856806>.
Test files in `tests/` are normally ignored by `x fmt`, but sometimes those files end up being run through `rustfmt` anyway, either by `rust-analyzer` or by hand.
When that happens, it's annoying to have to manually revert formatting changes that are unrelated to the actual changes being made. So it's helpful for the tests in the repository to already have standard formatting beforehand.
However, there are several coverage tests that deliberately use non-standard formatting, so that line counts reveal more information about where code regions begin and end. In those cases, we can use `#[rustfmt::skip]` to prevent that code from being disturbed.
``@rustbot`` label +A-code-coverage
Use an interpreter in MIR jump threading
This allows to understand assignments of aggregate constants. This case appears more frequently with GVN promoting aggregates to constants.
Tweak the threshold for chunked swapping
Thanks to `@AngelicosPhosphoros` for the tests here, which I copied from #98892.
This is an experiment as a simple alternative to that PR that just tweaks the existing threshold, since that PR showed that 3×Align (like `String`) currently doesn't work as well as it could.
Remove special handling of `box` expressions from parser
#108471 added a temporary hack to parse `box expr`. It's been almost a year since then, so I think it's safe to remove the special handling.
As a drive-by cleanup, move `parser/removed-syntax*` tests to their own directory.
bjorn3 says:
> On errors we don't finalize the incr comp cache, but non-fatal diagnostics are cached afaik.
Otherwise we would have to replay the query in question, which we may not be able to do if the query
key is not reconstructible from the dep node fingerprint.
So we must track these flags to avoid replaying incorrect diagnostics.
`single_use_lifetimes`: Don't suggest deleting lifetimes with bounds
Closes#117965
```
9 | pub fn get<'b: 'a>(&'b self) -> &'a str {
| ^^ -- ...is used only here
| |
| this lifetime...
```
In this example, I think the `&'b self` can be replaced with the bound itself, yielding `&'a self`, but this would require a deeper refactor. Happy to do as a follow-on PR if desired.
Avoid ICEs in trait names without `dyn`
Check diagnostic is error before downgrading. Fix#119633.
Account for traits using self-trait by name without `dyn`. Fix#119652.
Stabilize single-field offset_of
This PR stabilizes offset_of for a single field. There has been some further discussion at https://github.com/rust-lang/rust/issues/106655 about whether this is advisable; I'm opening the PR anyway so that the code is available.
LLVM 18 x86 data layout update
With https://reviews.llvm.org/D86310 LLVM now has i128 aligned to 16-bytes on x86 based platforms. This will be in LLVM-18. This patch updates all our spec targets to be 16-byte aligned, and removes the alignment when speaking to older LLVM.
This results in Rust overaligning things relative to LLVM on older LLVMs.
This implements MCP https://github.com/rust-lang/compiler-team/issues/683.
See #54341
Suggest `.swap()` when encountering conflicting borrows from `mem::swap` on a slice
This PR modifies the existing suggestion by matching on `[ProjectionElem::Deref, ProjectionElem::Index(_)]` instead of just `[ProjectionElem::Index(_)]`, which caused us to miss many cases. Additionally, it adds a more specific, machine-applicable suggestion in the case we determine `mem::swap` was used to swap elements in a slice.
Closes#102269
never_patterns: typecheck never patterns
This checks that a `!` pattern is only used on an uninhabited type (modulo match ergonomics, i.e. `!` is allowed on `&Void`).
r? `@compiler-errors`
