Revert stabilization of trait_upcasting feature
Reverts #118133
This reverts commit 6d2b84b3ed7848fd91b8d6151d4451b3103ed816, reversing changes made to 73bc12199ea8c7651ed98b069c0dd6b0bb5fabcf.
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.
Document `Token{Stream,Tree}::Display` more thoroughly.
To expressly warn against the kind of proc macro implementation that was broken in #119875.
r? ``@petrochenkov``
Fix a `trimmed_def_paths` assertion failure.
`RegionHighlightMode::force_print_trimmed_def_path` can call `trimmed_def_paths` even when `tcx.sess.opts.trimmed_def_paths` is false. Based on the `force` in the method name, it seems this is deliberate, so I have removed the assertion.
Fixes#120035.
r? `@compiler-errors`
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
Consolidate logic around resolving built-in coroutine trait impls
Deduplicates a lot of code. Requires defining a new lang item for `Coroutine::resume` for consistency, but it seems not harmful at worst, and potentially later useful at best.
r? oli-obk
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``
Fix tty detection for msys2's `/dev/ptmx`
Our "true negative" detection assumes that if at least one std handle is a Windows console then no other handle will be a msys2 tty pipe. This turns out to be a faulty assumption in the case of redirection to `/dev/ptmx` in an msys2 shell. Maybe this is an msys2 bug but in any case we should try to make it work.
An alternative to this would be to replace the "true negative" detection with an attempt to detect if we're in an msys environment (e.g. by sniffing environment variables) but that seems like it'd be flaky too.
Fixes#119658
When encountering
```rust
let _ = if true {
Struct
} else {
foo() // -> Box<dyn Trait>
};
```
if `Struct` implements `Trait`, suggest boxing the then arm tail expression.
Part of #102629.
respect `#[allow]` attributes in `single_call_fn` lint
Fixes#12182
If we delay linting to `check_crate_post`, we need to use `span_lint_hir_and_then`, since otherwise it would only respect those lint level attributes at the crate root.
<sub>... maybe we can have an internal lint for this somehow?</sub>
changelog: respect `#[allow]` attributes in `single_call_fn` lint
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
Don't emit `derive_partial_eq_without_eq` lint if the type has the `non_exhaustive` attribute
Part of https://github.com/rust-lang/rust-clippy/issues/9063.
If a type has a field/variant with the `#[non_exhaustive]` attribute or the type itself has it, then do no emit the `derive_partial_eq_without_eq` lint.
changelog: Don't emit `derive_partial_eq_without_eq` lint if the type has the `non_exhaustive` attribute
Co-authored-by: Frank Laub <flaub@risc0.com>
Co-authored-by: nils <nils@risc0.com>
Co-authored-by: Victor Graf <victor@risczero.com>
Co-authored-by: weikengchen <w.k@berkeley.edu>
This also adds changes in the rust test suite in order to get a few of them to
pass.
Co-authored-by: Frank Laub <flaub@risc0.com>
Co-authored-by: Urgau <3616612+Urgau@users.noreply.github.com>
rustfmt: Check that a token can begin a nonterminal kind before parsing it as a macro arg
r? ``@ytmimi`` and/or ``@calebcartwright``
cc ``@fmease``
I'm putting this on r-l/rust since it should fix the nightly rustfmt version. If you don't care about having this regression until the next rustfmt->rust sync, then I can move that PR over to r-l/rustfmt.
---
> Any idea why the formatting would have changed [from #119099]?
**Copied over explanation:**
This has to do with the weirdness of the way that `parse_macro_arg` works. Unlike parsing nonterminal args in a macro-by-example, it eagerly tries, for example, to parse a type without checking that the beginning token may begin a type:
bf967319e2/src/parse/macros/mod.rs (L54)
Contrast this to the nonterminal parsing code, which first checks that the nonterminal may begin with a given token:
ef71f1047e/compiler/rustc_parse/src/parser/nonterminal.rs (L47)
In rust-lang/rust#119099, ``@fmease`` implemented a change so that `const Tr` would be parsed as `dyn const Tr` (a trait object to a const trait) in edition 2015.
This is okay for the purposes of macros, because he explicitly made sure that `const` did not get added to the list of tokens that may begin a `:ty` nonterminal kind: https://github.com/rust-lang/rust/pull/119099#discussion_r1436996007
However, since rustfmt is not so careful about eagerly parsing macro args before checking that they're legal in macro position, this changed the way that the string of tokens is being parsed into macro args.
Allow any `const` expression blocks in `thread_local!`
This PR contains a rebase of the macro change from #116392, together with adding a test under library/std/tests.
Testing this feature by making the documentation's example code needlessly more complicated was not appropriate as pointed out in https://github.com/rust-lang/rust/pull/116392#pullrequestreview-1753097757.
Without the macro change, this new test would fail to build as follows:
```console
error: no rules expected the token `let`
--> library/std/tests/thread.rs:26:13
|
26 | let value = 1;
| ^^^ no rules expected this token in macro call
|
note: while trying to match meta-variable `$init:expr`
--> library/std/src/thread/local.rs:189:69
|
189 | ($(#[$attr:meta])* $vis:vis static $name:ident: $t:ty = const { $init:expr }; $($rest:tt)*) => (
| ^^^^^^^^^^
```
Closes#116392.
`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.
