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Add a raw "address of" operator
* Parse and feature gate `&raw [const | mut] expr` (feature gate name is `raw_address_of`)
* Add `mir::Rvalue::AddressOf`
* Use the new `Rvalue` for:
* the new syntax
* reference to pointer casts
* drop shims for slices and arrays
* Stop using `mir::Rvalue::Cast` with a reference as the operand
* Correctly evaluate `mir::Rvalue::{Ref, AddressOf}` in constant propagation
cc @Centril @RalfJung @oli-obk @eddyb
cc #64490
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Use structured suggestion for disambiguating method calls
Fix #65635.
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This operator creates a raw pointer to a Place directly, without first
creating a reference. See RFC #2582 for motivation.
The Rvalue is currently unused.
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functions with a `const` modifier
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Fix #65635.
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Cleanup BodyCache
After this PR:
- `BodyCache` is renamed to `BodyAndCache`
- `ReadOnlyBodyCache` is renamed to `ReadOnlyBodyAndCache`
- `ReadOnlyBodyAndCache::body` fn is removed and all calls to it are replaced by a deref (possible due to fix of its `Deref` imp in #65947)
cc @eddyb @oli-obk
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Change unused_labels from allow to warn
Fixes #66324, making the unused_labels lint warn instead of allow by default. I'm told @rust-lang/lang will need to review this, and perhaps will want to do a crater run.
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Implement #[track_caller] attribute. (RFC 2091 4/N)
Implements the `#[track_caller]` attribute in both const and codegen contexts.
The const implementation walks up the stack to find the nearest untracked callsite.
The codegen implementation adds an implicit argument to tracked function calls, and populates it with either a call to the previously-landed intrinsic or if the caller has `#[track_caller]` with a copy of the location passed to the current function.
Also includes a little cleanup and a few comments in the other caller location areas.
[Depends on: 65664](https://github.com/rust-lang/rust/pull/65664)
[RFC 2091 text](https://github.com/rust-lang/rfcs/blob/master/text/2091-inline-semantic.md)
[Tracking issue](https://github.com/rust-lang/rust/issues/47809)
[Tracking doc](https://paper.dropbox.com/doc/track_rfc_2091_impl-notes--Anf1NwnIb0xcRv31YLIadyj0Ag-rwCdRc2fi2yvRZ7syGZ9q#:uid=863513134494965680023183&h2=TODO-actually-pass-location-to)
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We pass it in `of_instance` when the instance requires caller location.
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Index impl, remove body fn
rustc_codegen_ssa: Fix BodyAndCache reborrow to Body and change instances of body() call to derefence
rustc_mir: Fix BodyAndCache reborrow to Body and change intances of body() call to derefence
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Accurately portray raw identifiers in error messages
When refering to or suggesting raw identifiers, refer to them with `r#`.
Fix #65634.
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Organize intrinsics promotion checks
cc @vertexclique
supersedes #61835
r? @RalfJung
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When refering to or suggesting raw identifiers, refer to them with `r#`.
Fix #65634.
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rename all body_cache back to body
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ReadOnlyBodyCache
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(lifetime errors still exist)
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rustc: don't just show raw DefIndex's in BrNamed's fmt::Debug impl.
Context: these `fmt::Debug` impls only get used with `-Z verbose` (which some tests use).
I was going to print the path like in #66850 (or rather, use `DefId`'s `fmt::Debug`, which is close but not as nice), but then I realized that most of the `DefId`s were `crate0:DefIndex(0)`, i.e. the crate root.
As the crate root is not a lifetime, they're clearly dummies of some sort, and we don't have to print anything other than the name for them.
This means that out of all the tests, there's only 5 instances of `BrNamed` that now print the full path to the lifetime parameter, and everything else is shorter instead, which doesn't feel too bad.
cc @nikomatsakis
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rustc: hide HirId's fmt::Debug output from -Z span_free_formats.
This replaces the only occurrences of `HirId {...}` from tests with paths, i.e.:
```rust
[closure@HirId { owner: DefIndex(4), local_id: 15 } q:&i32, t:&T]
```
becomes, after this PR:
```rust
[closure@foo<T>::{{closure}}#0 q:&i32, t:&T]
```
r? @oli-obk cc @michaelwoerister
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Improve lifetime errors with implicit trait object lifetimes
r? @matthewjasper
cc @estebank
I still think the ideal solution would be to construct a `BrAnon`, but that seems like a more invasive change, and can be done later. This at least gets rid of the hack in `OutliveSuggestion` and is slightly more principled.
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Feature gating *declarations* => new crate `rustc_feature`
This PR moves the data-oriented parts of feature gating into its own crate, `rustc_feature`.
The parts consist of some data types as well as `accepted`, `active`, `removed`, and `builtin_attrs`.
Feature gate checking itself remains in `syntax::feature_gate::check`. The parts which define how to emit feature gate errors could probably be moved to `rustc_errors` or to the new `rustc_session` crate introduced in #66878. The visitor itself could probably be moved as a pass in `rustc_passes` depending on how the dependency edges work out.
The PR also contains some drive-by cleanup of feature gate checking. As such, the PR probably best read commit-by-commit.
r? @oli-obk
cc @petrochenkov
cc @Mark-Simulacrum
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rustc_typeck: gate AnonConst's generics on feature(const_generics).
This PR employs the fix for #43408 when `#![feature(const_generics)]` is enabled, making the feature-gate the opt-in for all the possible breakage this may incur.
For example, if this PR lands, this will cause a cycle error (due to #60471):
```rust
#![feature(const_generics)]
fn foo<T: Into<[u8; 4]>>() {}
```
And so will anything with type-level const expressions, in its bounds.
Surprisingly, `impl`s don't seem to be affected (if they were, even libcore wouldn't compile).
One thing I'm worried about is not knowing how much unstable code out there, using const-generics, will be broken. But types like `Foo<{N+1}>` never really worked, and do after this PR, just not in bounds - so ironically, it's type-level const expressions that don't depend on generics, which will break (in bounds).
Also, if we do this, we'll have effectively blocked stabilization of const generics on #60471.
r? @oli-obk cc @varkor @yodaldevoid @nikomatsakis
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Record temporary static references in generator witnesses
Closes #66695
* Record the pointer to static's type in MIR.
* Normalize the static's type (so that constants can be compared correctly).
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Handle GlobalCtxt directly from librustc_interface query system
This PR constructs the `GlobalCtxt` as a member of the `Queries` in librustc_interface.
This simplifies the code to construct it, at the expense of added complexity in the query control flow.
This allows to handle the arenas directly from librustc_interface.
Based on #66707
r? @Zoxc
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