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For some cases where it's clear that an error has already occurred,
e.g.:
- there's a comment stating exactly that, or
- things like HIR lowering, where we are lowering an error kind
The commit also tweaks some comments around delayed bug sites.
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`swap` has been deprecated in favour of `swap_remove` - the behaviour
is the same though.
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Remove good path delayed bugs
Because they're not that useful, and kind of annoying. Details in the individual commits.
r? ```@compiler-errors```
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It's only has a single remaining purpose: to ensure that a diagnostic is
printed when `trimmed_def_paths` is used. It's an annoying mechanism:
weak, with odd semantics, badly named, and gets in the way of other
changes.
This commit replaces it with a simpler `must_produce_diag` mechanism,
getting rid of a diagnostic `Level` along the way.
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Dejargonize `subst`
In favor of #110793, replace almost every occurence of `subst` and `substitution` from rustc codes, but they still remains in subtrees under `src/tools/` like clippy and test codes (I'd like to replace them after this)
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Fix async closures in CTFE
First commit renames `is_coroutine_or_closure` into `is_closure_like`, because `is_coroutine_or_closure_or_coroutine_closure` seems confusing and long.
Second commit fixes some forgotten cases where we want to handle `TyKind::CoroutineClosure` the same as closures and coroutines.
The test exercises the change to `ValidityVisitor::aggregate_field_path_elem` which is the source of #120946, but not the change to `UsedParamsNeedSubstVisitor`, though I feel like it's not that big of a deal. Let me know if you'd like for me to look into constructing a test for the latter, though I have no idea what it'd look like (we can't assert against `TooGeneric` anywhere?).
Fixes #120946
r? oli-obk cc ``@RalfJung``
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check_consts: fix duplicate errors, make importance consistent
This is stuff I noticed while working on https://github.com/rust-lang/rust/pull/120932, but it's orthogonal to that PR.
r? ``@oli-obk``
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Remove a bunch of dead parameters in functions
Found this kind of issue when working on https://github.com/rust-lang/rust/pull/119650
I wrote a trivial toy lint and manual review to find these.
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nnethercote:more-internal-emit_diagnostics-cleanups, r=oli-obk
More internal emit diagnostics cleanups
Miscellaneous improvements.
r? ``@oli-obk``
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This also now allows promoteds everywhere to point to 'extern static', because why not?
We still check that constants cannot transitively reach 'extern static' through references.
(We allow it through raw pointers.)
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Because it also has a `DiagnosticBuilder` arg, which contains a `dcx`
reference.
Also rename some `builder` variables as `diag`, because that's the usual
name.
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interpret/visitor: ensure we only see normalized types
[Prior discussion on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/146212-t-compiler.2Fconst-eval/topic/Normalization.20after.20field.20projection)
r? `@compiler-errors`
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hir: Refactor getters for HIR parents
See individual commits.
I ended up removing on of the FIXMEs from https://github.com/rust-lang/rust/pull/120206 instead of addressing it.
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Rollup of 9 pull requests
Successful merges:
- #119213 (simd intrinsics: add simd_shuffle_generic and other missing intrinsics)
- #120272 (Suppress suggestions in derive macro)
- #120773 (large_assignments: Allow moves into functions)
- #120874 (Take empty `where` bounds into account when suggesting predicates)
- #120882 (interpret/write_discriminant: when encoding niched variant, ensure the stored value matches)
- #120883 (interpret: rename ReadExternStatic → ExternStatic)
- #120890 (Adapt `llvm-has-rust-patches` validation to take `llvm-config` into account.)
- #120895 (don't skip coercions for types with errors)
- #120896 (Print kind of coroutine closure)
r? `@ghost`
`@rustbot` modify labels: rollup
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unnecessarily
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Fold pointer operations in GVN
This PR proposes 2 combinations of cast operations in MIR GVN:
- a chain of `PtrToPtr` or `MutToConstPointer` casts can be folded together into a single `PtrToPtr` cast;
- we attempt to evaluate more ptr ops when there is no provenance.
In particular, this allows to read from static slices.
This is not yet sufficient to see through slice operations that use `PtrComponents` (because that's a union), but still a step forward.
r? `@ghost`
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interpret: rename ReadExternStatic → ExternStatic
This error shows up for reads and writes, so `ReadExternStatic` is misleading.
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interpret/write_discriminant: when encoding niched variant, ensure the stored value matches
Cc https://github.com/rust-lang/unsafe-code-guidelines/issues/487
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stored value matches
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static mut: allow mutable reference to arbitrary types, not just slices and arrays
For historical reasons, we allow this:
```rust
static mut ARRAY: &'static mut [isize] = &mut [1];
```
However, we do not allow this:
```rust
static mut INT: &'static mut isize = &mut 1;
```
I think that's terribly inconsistent. I don't care much for `static mut`, but we have to keep it around for backwards compatibility and so we have to keep supporting it properly in the compiler. In recent refactors of how we deal with mutability of data in `static` and `const`, I almost made a fatal mistake since I tested `static mut INT: &'static mut isize = &mut 1` and concluded that we don't allow such `'static` mutable references even inside `static mut`. After all, nobody would expect this to be allowed only for arrays and slices, right?!?? So for the sake of our own sanity, and of whoever else reverse engineers these rules in the future to understand what the Rust compiler accepts or does not accept, I propose that we accept this for all types, not just arrays and slices.
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improve normalization of `Pointee::Metadata`
This PR makes it so that `<Wrapper<Tail> as Pointee>::Metadata` is normalized to `<Tail as Pointee>::Metadata` if we don't know `Wrapper<Tail>: Sized`. With that, the trait solver can prove projection predicates like `<Wrapper<Tail> as Pointee>::Metadata == <Tail as Pointee>::Metadata`, which makes it possible to use the metadata APIs to cast between the tail and the wrapper:
```rust
#![feature(ptr_metadata)]
use std::ptr::{self, Pointee};
fn cast_same_meta<T: ?Sized, U: ?Sized>(ptr: *const T) -> *const U
where
T: Pointee<Metadata = <U as Pointee>::Metadata>,
{
let (thin, meta) = ptr.to_raw_parts();
ptr::from_raw_parts(thin, meta)
}
struct Wrapper<T: ?Sized>(T);
fn cast_to_wrapper<T: ?Sized>(ptr: *const T) -> *const Wrapper<T> {
cast_same_meta(ptr)
}
```
Previously, this failed to compile:
```
error[E0271]: type mismatch resolving `<Wrapper<T> as Pointee>::Metadata == <T as Pointee>::Metadata`
--> src/lib.rs:16:5
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15 | fn cast_to_wrapper<T: ?Sized>(ptr: *const T) -> *const Wrapper<T> {
| - found this type parameter
16 | cast_same_meta(ptr)
| ^^^^^^^^^^^^^^ expected `Wrapper<T>`, found type parameter `T`
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= note: expected associated type `<Wrapper<T> as Pointee>::Metadata`
found associated type `<T as Pointee>::Metadata`
= note: an associated type was expected, but a different one was found
```
(Yes, you can already do this with `as` casts. But using functions is so much :sparkles: *safer* :sparkles:, because you can't change the metadata on accident.)
---
This PR essentially changes the built-in impls of `Pointee` from this:
```rust
// before
impl Pointee for u8 {
type Metadata = ();
}
impl Pointee for [u8] {
type Metadata = usize;
}
// ...
impl Pointee for Wrapper<u8> {
type Metadata = ();
}
impl Pointee for Wrapper<[u8]> {
type Metadata = usize;
}
// ...
// This impl is only selected if `T` is a type parameter or unnormalizable projection or opaque type.
fallback impl<T: ?Sized> Pointee for Wrapper<T>
where
Wrapper<T>: Sized
{
type Metadata = ();
}
// This impl is only selected if `T` is a type parameter or unnormalizable projection or opaque type.
fallback impl<T /*: Sized */> Pointee for T {
type Metadata = ();
}
```
to this:
```rust
// after
impl Pointee for u8 {
type Metadata = ();
}
impl Pointee for [u8] {
type Metadata = usize;
}
// ...
impl<T: ?Sized> Pointee for Wrapper<T> {
// in the old solver this will instead project to the "deep" tail directly,
// e.g. `Wrapper<Wrapper<T>>::Metadata = T::Metadata`
type Metadata = <T as Pointee>::Metadata;
}
// ...
// This impl is only selected if `T` is a type parameter or unnormalizable projection or opaque type.
fallback impl<T /*: Sized */> Pointee for T {
type Metadata = ();
}
```
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Rollup of 8 pull requests
Successful merges:
- #113671 (Make privacy visitor use types more (instead of HIR))
- #120308 (core/time: avoid divisions in Duration::new)
- #120693 (Invert diagnostic lints.)
- #120704 (A drive-by rewrite of `give_region_a_name()`)
- #120809 (Use `transmute_unchecked` in `NonZero::new`.)
- #120817 (Fix more `ty::Error` ICEs in MIR passes)
- #120828 (Fix `ErrorGuaranteed` unsoundness with stash/steal.)
- #120831 (Startup objects disappearing from sysroot)
r? `@ghost`
`@rustbot` modify labels: rollup
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Fix more `ty::Error` ICEs in MIR passes
Fixes #120791 - Add a check for `ty::Error` in the `ByMove` coroutine pass
Fixes #120816 - Add a check for `ty::Error` in the MIR validator
Also a drive-by fix for a FIXME I had asked oli to add
r? oli-obk
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Invert diagnostic lints.
That is, change `diagnostic_outside_of_impl` and `untranslatable_diagnostic` from `allow` to `deny`, because more than half of the compiler has been converted to use translated diagnostics.
This commit removes more `deny` attributes than it adds `allow` attributes, which proves that this change is warranted.
r? ````@davidtwco````
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And in clippy
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various const interning cleanups
After #119044 I noticed that some things can be simplified and refactored.
This is also a requirement for https://github.com/rust-lang/rust/pull/116564 as there we'll need to treat the base allocation differently from the others
r? ````@RalfJung````
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update indirect structural match lints to match RFC and to show up for dependencies
This is a large step towards implementing https://github.com/rust-lang/rfcs/pull/3535.
We currently have five lints related to "the structural match situation":
- nontrivial_structural_match
- indirect_structural_match
- pointer_structural_match
- const_patterns_without_partial_eq
- illegal_floating_point_literal_pattern
This PR concerns the first 3 of them. (The 4th already is set up to show for dependencies, and the 5th is removed by https://github.com/rust-lang/rust/pull/116284.) nontrivial_structural_match is being removed as per the RFC; the other two are enabled to show up in dependencies.
Fixes https://github.com/rust-lang/rust/issues/73448 by removing the affected analysis.
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miri: fix ICE with symbolic alignment check on extern static
Fixes https://github.com/rust-lang/miri/issues/3288. Also fixes [this example](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=38ee338ff10726be72bdd6efa3386763).
This could almost be a Miri PR, except for that typo fix in the validator. I started this as a rustc patch since I thought I need rustc changes, and now it'd be too annoying to turn this into a Miri PR...
r? `@oli-obk`
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