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replace `once_cell::sync::OnceCell` with std `OnceLock`
> https://github.com/rust-lang/rust/blob/0919ad18381f6f4fcaddc809e786553e028bbde0/src/bootstrap/src/core/builder.rs#L28-L33
Partially resolves that.
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Add more information to StableMIR Instance
Allow stable MIR users to retrieve an instance function signature, the index for a VTable instance and more information about its underlying definition.
These are needed to properly interpret function calls, either via VTable or direct calls. The `CrateDef` implementation will also allow users to emit diagnostic messages.
I also fixed a few issues that we had identified before with how we were retrieving body of things that may not have a body available.
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rustc_hir_typeck: Fix ICE when probing for non-ASCII function alternative
Closes #118499
Apparently triggered by https://github.com/rust-lang/rust/pull/118381
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Name explicit registers in conflict register errors for inline assembly
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Clippy subtree sync
r? `@Manishearth`
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Signed-off-by: onur-ozkan <work@onurozkan.dev>
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fix an ICE when a valtree failed to evaluate
Fixes https://github.com/rust-lang/rust/issues/118285
r? `@lcnr`
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Handle recursion limit for subtype and well-formed predicates
Adds a recursion limit check for subtype predicates and well-formed predicates.
`-Ztrait-solver=next` currently panics with unimplemented for these cases.
These cases are arguably bugs in the occurs check but:
- I could not find a simple way to fix the occurs check
- There should still be a recursion limit check to prevent hangs anyway.
closes #117151
r? types
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Update mdbook to 0.4.36
Just a routine update that makes some minor fixes and changes.
Changlog: https://github.com/rust-lang/mdBook/blob/master/CHANGELOG.md#mdbook-0436
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Cleanup error handlers
Mostly by making function naming more consistent. More to do after this, but this is enough for one PR.
r? compiler-errors
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- Retrieve `FnSig`.
- Implement CrateDef for InstanceDef.
- Add VTable index for Virtual instances.
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Centralize live loans maintenance to fix scope differences due to liveness
As found in the recent [polonius crater run](https://github.com/rust-lang/rust/pull/117593#issuecomment-1801398892), NLLs and the location-insensitive polonius computed different scopes on some specific CFG shapes, e.g. the following.
I had missed that liveness data was pushed from different sources than just the liveness computation: there are a few places that do this -- and some of them may be unneeded or at the very least untested, as no tests changed when I tried removing some of them.
Here, `_6` is e.g. dead on entry to `bb2[0]` during `liveness::trace`, but its regions will be marked as live later during "constraint generation" (which I plan to refactor away and put in the liveness module soon). This should cause the inflowing loans to be marked live, but they were only computed in `liveness::trace`.
Therefore, this PR moves live loan maintenance to `LivenessValues`, so that the various places pushing liveness data will all also update live loans at the same time -- except for promoteds which I don't believe need them, and their liveness handling is already interesting/peculiar.
All the regressions I saw in the initial crater run were related to this kind of shapes, and this change did fix all of them on the [next run](https://github.com/rust-lang/rust/pull/117593#issuecomment-1826132145).
r? `@matthewjasper`
(This will conflict with #117880 but whichever lands first is fine by me, the end goal is the same for both)
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It has a single call site.
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- Avoid unnecessary `inner` local variables.
- Use `borrow_mut` everywhere (instead of the synonym `lock`).
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To match with the previous commits.
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In line with the previous commits.
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For reasons similar to the previous commit.
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Because the corresponding `Level` is `DelayedBug` and `span_delayed_bug`
follows the pattern used everywhere else: `span_err`, `span_warning`,
etc.
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Because the variant name in `Level` is `Note`, and the `without_error`
suffix is omitted in similar cases like `struct_allow` and
`struct_help`.
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To match the `FailureNote` variant of `Level`.
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Because `span_note_diag` doesn't follow the naming structure used for
the error reporting functions.
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`ErrorGuaranteed` should be used for all error methods involving the
`Error` level, e.g. as is done for the corresponding `span_err` methods.
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It has a single call site.
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Restore `#![no_builtins]` crates participation in LTO.
After #113716, we can make `#![no_builtins]` crates participate in LTO again.
`#![no_builtins]` with LTO does not result in undefined references to the error. I believe this type of issue won't happen again.
Fixes #72140. Fixes #112245. Fixes #110606. Fixes #105734. Fixes #96486. Fixes #108853. Fixes #108893. Fixes #78744. Fixes #91158. Fixes https://github.com/rust-lang/cargo/issues/10118. Fixes https://github.com/rust-lang/compiler-builtins/issues/347.
The `nightly-2023-07-20` version does not always reproduce problems due to changes in compiler-builtins, core, and user code. That's why this issue recurs and disappears.
Some issues were not tested due to the difficulty of reproducing them.
r? pnkfelix
cc `@bjorn3` `@japaric` `@alexcrichton` `@Amanieu`
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Error if symlinks are not supported in CI
In CI we want to run as many tests as possible and be alerted if a test isn't run for any reason.
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Rustup
r? `@ghost`
changelog: none
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vis note for no pub reexports glob import
Fixes #115966
Only trigger the `unused_import` lint when it's not being used.
r? `@petrochenkov`
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Liveness data is pushed from multiple parts of NLL. Instead of changing
the call sites to maintain live loans, move the latter to `LivenessValues` where
this liveness data is pushed to, and maintain live loans there.
This fixes the differences in polonius scopes on some CFGs where a
variable was dead in tracing but as a MIR terminator its regions were marked
live from "constraint generation"
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for consistency with how they're named everywhere else
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Stabilize C string literals
RFC: https://rust-lang.github.io/rfcs/3348-c-str-literal.html
Tracking issue: https://github.com/rust-lang/rust/issues/105723
Documentation PR (reference manual): https://github.com/rust-lang/reference/pull/1423
# Stabilization report
Stabilizes C string and raw C string literals (`c"..."` and `cr#"..."#`), which are expressions of type [`&CStr`](https://doc.rust-lang.org/stable/core/ffi/struct.CStr.html). Both new literals require Rust edition 2021 or later.
```rust
const HELLO: &core::ffi::CStr = c"Hello, world!";
```
C strings may contain any byte other than `NUL` (`b'\x00'`), and their in-memory representation is guaranteed to end with `NUL`.
## Implementation
Originally implemented by PR https://github.com/rust-lang/rust/pull/108801, which was reverted due to unintentional changes to lexer behavior in Rust editions < 2021.
The current implementation landed in PR https://github.com/rust-lang/rust/pull/113476, which restricts C string literals to Rust edition >= 2021.
## Resolutions to open questions from the RFC
* Adding C character literals (`c'.'`) of type `c_char` is not part of this feature.
* Support for `c"..."` literals does not prevent `c'.'` literals from being added in the future.
* C string literals should not be blocked on making `&CStr` a thin pointer.
* It's possible to declare constant expressions of type `&'static CStr` in stable Rust (as of v1.59), so C string literals are not adding additional coupling on the internal representation of `CStr`.
* The unstable `concat_bytes!` macro should not accept `c"..."` literals.
* C strings have two equally valid `&[u8]` representations (with or without terminal `NUL`), so allowing them to be used in `concat_bytes!` would be ambiguous.
* Adding a type to represent C strings containing valid UTF-8 is not part of this feature.
* Support for a hypothetical `&Utf8CStr` may be explored in the future, should such a type be added to Rust.
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Refactor NLL constraint generation and most of polonius fact generation
As discussed in #118175, NLL "constraint generation" is only about liveness, but currently also contains legacy polonius fact generation. The latter is quite messy, and this PR cleans this up to prepare for its future removal:
- splits polonius fact generation out of NLL constraint generation
- merges NLL constraint generation to its more natural place, liveness
- extracts all of the polonius fact generation from NLLs apart from MIR typeck (as fact generation is somewhat in a single place there already, but should be cleaned up) into its own explicit module, with a single entry point instead of many.
There should be no behavior changes, and tests seem to behave the same as master: without polonius, with legacy polonius, with the in-tree polonius.
I've split everything into smaller logical commits for easier review, as it required quite a bit of code to be split and moved around, but it should all be trivial changes.
r? `@matthewjasper`
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Rollup of 3 pull requests
Successful merges:
- #118483 (rustdoc: `div.where` instead of fmt-newline class)
- #118486 (generic_const_exprs: suggest to add the feature, not use it)
- #118489 (Wesley is on vacation)
r? `@ghost`
`@rustbot` modify labels: rollup
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Allow `allow`ing `upper_case_acronyms` on enum variants
Fixes #7708
changelog: [`upper_case_acronyms`]: allow `allow`ing on enum variants
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Wesley is on vacation
OOF until Dec-11 🏖️
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generic_const_exprs: suggest to add the feature, not use it
Usually our missing feature messages look something like
```
= help: add `#![feature(inline_const)]` to the crate attributes to enable
```
However `generic_const_exprs` used a different verb. That's inconsistent and it also means playground won't add that nice hyperlink to add the feature automatically. So let's use the same verb as everywhere else.
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