Jon Gjengset [Fri, 11 Feb 2022 19:44:44 +0000 (11:44 -0800)]
bootstrap: make LLVM build respect *FLAGS envvars
This tidies up the logic in `src/bootstrap/native.rs` such that:
- `CMAKE_*_LINKER_FLAGS` is not overridden if we add to it twice.
- `CMAKE_*_FLAGS` also include the standard `*FLAGS` environment
variables, which CMake respects when we _don't_ set `CMAKE_*_FLAGS`.
- `llvm.ldflags` from `config.toml` appends to the ldflags Rust's
bootstrap logic adds, rather than replacing them.
bors [Fri, 11 Feb 2022 15:16:09 +0000 (15:16 +0000)]
Auto merge of #93891 - matthiaskrgr:rollup-xadut8w, r=matthiaskrgr
Rollup of 8 pull requests
Successful merges:
- #92242 (Erase regions before calculating layout for packed field capture)
- #93443 (Add comment on stable_hash_impl for OwnerNodes)
- #93742 (Drop rustc-docs from complete profile)
- #93852 (rustdoc: remove support for multi-query search)
- #93853 (Make all `hir::Map` methods consistently by-value)
- #93861 (Fix ICE if no trait assoc const eq)
- #93862 (Split x86_64-apple builder into two)
- #93864 (Remove ArchiveBuilder::update_symbols)
Matthias Krüger [Fri, 11 Feb 2022 06:48:09 +0000 (07:48 +0100)]
Rollup merge of #93862 - Mark-Simulacrum:apple-split, r=pietroalbini
Split x86_64-apple builder into two
This splits out roughly 20-25 minutes of work, which should result in roughly parity with some of the other apple builders at approximately 2.2-2.4 hours per successful build.
Matthias Krüger [Fri, 11 Feb 2022 06:48:06 +0000 (07:48 +0100)]
Rollup merge of #93853 - steffahn:map_by_value, r=wesleywiser
Make all `hir::Map` methods consistently by-value
`hir::Map` only consists of a single reference (as part of the contained `TyCtxt`) anyways, so copying is literally zero overhead compared to passing a reference
Matthias Krüger [Fri, 11 Feb 2022 06:48:02 +0000 (07:48 +0100)]
Rollup merge of #92242 - compiler-errors:layout-modulo-regions, r=matthewjasper
Erase regions before calculating layout for packed field capture
Self-explanatory. We just erase region inferencing because we don't need that for layout computation... Q: layouts are always equal modulo regions, right?
Matthias Krüger [Thu, 10 Feb 2022 11:10:02 +0000 (12:10 +0100)]
Rollup merge of #93843 - solid-rs:fix-kmc-solid-condvar, r=m-ou-se
kmc-solid: Fix wait queue manipulation errors in the `Condvar` implementation
This PR fixes a number of bugs in the `Condvar` wait queue implementation used by the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets. These bugs can occur when there are multiple threads waiting on the same `Condvar` and sometimes manifest as an `unwrap` failure.
Matthias Krüger [Thu, 10 Feb 2022 11:09:55 +0000 (12:09 +0100)]
Rollup merge of #92670 - hermitcore:kernel, r=davidtwco
add kernel target for RustyHermit
Currently, we are thinking to use *-unknown-none targets instead to define for every platform our own one (see hermitcore/rusty-hermit#197). However, the current target aarch64-unknown-none-softfloat doesn't support dynamic relocation. Our RustyHermit project uses this feature and consequently we define a new target aarch64-unknown-hermitkernel to support it.
> A tier 3 target must have a designated developer or developers (the "target maintainers") on record to be CCed when issues arise regarding the target. (The mechanism to track and CC such developers may evolve over time.)
I would be willing to be a target maintainer, though I would appreciate if others volunteered to help with that as well.
> Targets must use naming consistent with any existing targets; for instance, a target for the same CPU or OS as an existing Rust target should use the same name for that CPU or OS. Targets should normally use the same names and naming conventions as used elsewhere in the broader ecosystem beyond Rust (such as in other toolchains), unless they have a very good reason to diverge. Changing the name of a target can be highly disruptive, especially once the target reaches a higher tier, so getting the name right is important even for a tier 3 target.
Uses the same naming as the LLVM target, and the same convention as many other kernel targets (e.g. `x86_64_unknown_none_linuxkernel`). In contrast to the bare-metal target for the aarch64 architecture, the unikernel requires dynamic relocation.
> Target names should not introduce undue confusion or ambiguity unless absolutely necessary to maintain ecosystem compatibility. For example, if the name of the target makes people extremely likely to form incorrect beliefs about what it targets, the name should be changed or augmented to disambiguate it.
I don't believe there is any ambiguity here. It use the same convention on x86_64 architecture.
> Tier 3 targets may have unusual requirements to build or use, but must not create legal issues or impose onerous legal terms for the Rust project or for Rust developers or users.
I don't see any legal issues here.
> The target must not introduce license incompatibilities.
Anything added to the Rust repository must be under the standard Rust license (MIT OR Apache-2.0).
The target must not cause the Rust tools or libraries built for any other host (even when supporting cross-compilation to the target) to depend on any new dependency less permissive than the Rust licensing policy. This applies whether the dependency is a Rust crate that would require adding new license exceptions (as specified by the tidy tool in the rust-lang/rust repository), or whether the dependency is a native library or binary. In other words, the introduction of the target must not cause a user installing or running a version of Rust or the Rust tools to be subject to any new license requirements.
If the target supports building host tools (such as rustc or cargo), those host tools must not depend on proprietary (non-FOSS) libraries, other than ordinary runtime libraries supplied by the platform and commonly used by other binaries built for the target. For instance, rustc built for the target may depend on a common proprietary C runtime library or console output library, but must not depend on a proprietary code generation library or code optimization library. Rust's license permits such combinations, but the Rust project has no interest in maintaining such combinations within the scope of Rust itself, even at tier 3.
Targets should not require proprietary (non-FOSS) components to link a functional binary or library.
"onerous" here is an intentionally subjective term. At a minimum, "onerous" legal/licensing terms include but are not limited to: non-disclosure requirements, non-compete requirements, contributor license agreements (CLAs) or equivalent, "non-commercial"/"research-only"/etc terms, requirements conditional on the employer or employment of any particular Rust developers, revocable terms, any requirements that create liability for the Rust project or its developers or users, or any requirements that adversely affect the livelihood or prospects of the Rust project or its developers or users.
I see no issues with any of the above.
> Neither this policy nor any decisions made regarding targets shall create any binding agreement or estoppel by any party. If any member of an approving Rust team serves as one of the maintainers of a target, or has any legal or employment requirement (explicit or implicit) that might affect their decisions regarding a target, they must recuse themselves from any approval decisions regarding the target's tier status, though they may otherwise participate in discussions.
This requirement does not prevent part or all of this policy from being cited in an explicit contract or work agreement (e.g. to implement or maintain support for a target). This requirement exists to ensure that a developer or team responsible for reviewing and approving a target does not face any legal threats or obligations that would prevent them from freely exercising their judgment in such approval, even if such judgment involves subjective matters or goes beyond the letter of these requirements.
Only relevant to those making approval decisions.
> Tier 3 targets should attempt to implement as much of the standard libraries as possible and appropriate (core for most targets, alloc for targets that can support dynamic memory allocation, std for targets with an operating system or equivalent layer of system-provided functionality), but may leave some code unimplemented (either unavailable or stubbed out as appropriate), whether because the target makes it impossible to implement or challenging to implement. The authors of pull requests are not obligated to avoid calling any portions of the standard library on the basis of a tier 3 target not implementing those portions.
`core` and `alloc` can be used. For `std` exists already the target `aarch64_unknown_hermit`, which enables FPU support.
> The target must provide documentation for the Rust community explaining how to build for the target, using cross-compilation if possible. If the target supports running tests (even if they do not pass), the documentation must explain how to run tests for the target, using emulation if possible or dedicated hardware if necessary.
Use `--target=aarch64_unknown_hermitkernel` option to cross compile. The target does currently not support running tests.
> Tier 3 targets must not impose burden on the authors of pull requests, or other developers in the community, to maintain the target. In particular, do not post comments (automated or manual) on a PR that derail or suggest a block on the PR based on a tier 3 target. Do not send automated messages or notifications (via any medium, including via `@)` to a PR author or others involved with a PR regarding a tier 3 target, unless they have opted into such messages.
Backlinks such as those generated by the issue/PR tracker when linking to an issue or PR are not considered a violation of this policy, within reason. However, such messages (even on a separate repository) must not generate notifications to anyone involved with a PR who has not requested such notifications.
I don't foresee this being a problem.
> Patches adding or updating tier 3 targets must not break any existing tier 2 or tier 1 target, and must not knowingly break another tier 3 target without approval of either the compiler team or the maintainers of the other tier 3 target.
In particular, this may come up when working on closely related targets, such as variations of the same architecture with different features. Avoid introducing unconditional uses of features that another variation of the target may not have; use conditional compilation or runtime detection, as appropriate, to let each target run code supported by that target.
No other targets should be affected by the pull request.
bors [Thu, 10 Feb 2022 09:37:07 +0000 (09:37 +0000)]
Auto merge of #93511 - cjgillot:query-copy, r=oli-obk
Ensure that queries only return Copy types.
This should pervent the perf footgun of returning a result with an expensive `Clone` impl (like a `Vec` of a hash map).
I went for the stupid solution of allocating on an arena everything that was not `Copy`. Some query results could be made Copy easily, but I did not really investigate.
bors [Thu, 10 Feb 2022 02:27:43 +0000 (02:27 +0000)]
Auto merge of #93836 - matthiaskrgr:rollup-d1ssiwl, r=matthiaskrgr
Rollup of 6 pull requests
Successful merges:
- #91443 (Better suggestions when user tries to collect into an unsized `[_]`)
- #91504 (`#[used(linker)]` attribute)
- #93503 (debuginfo: Fix DW_AT_containing_type vtable debuginfo regression)
- #93753 (Complete removal of #[main] attribute from compiler)
- #93799 (Fix typo in `std::fmt` docs)
- #93813 (Make a few cleanup MIR passes public)
This makes a few passes which used to be public, public again. I'd like to use these to clean up MIR code for my external rustc driver. The other option would be to make them all public, but I don't know if that's warranted / useful.
Matthias Krüger [Wed, 9 Feb 2022 22:29:57 +0000 (23:29 +0100)]
Rollup merge of #93753 - jeremyBanks:main-conflict, r=petrochenkov
Complete removal of #[main] attribute from compiler
resolves #93786
---
The `#[main]` attribute was mostly removed from the language in #84217, but not completely. It is still recognized as a builtin attribute by the compiler, but it has no effect. However, this no-op attribute is no longer gated by `#[feature(main)]` (which no longer exists), so it's possible to include it in code *on stable* without any errors, which seems unintentional. For example, the following code is accepted ([playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&code=%23%5Bmain%5D%0Afn%20main()%20%7B%0A%20%20%20%20println!(%22hello%20world%22)%3B%0A%7D%0A)).
Aside from that oddity, the existence of this attribute causes code like the following to fail ([playground link](https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&code=use%20tokio%3A%3Amain%3B%0A%0A%23%5Bmain%5D%0Afn%20main()%20%7B%0A%20%20%20%20println!(%22hello%20world%22)%3B%0A%7D%0A)). According https://github.com/rust-lang/rust/pull/84062#issuecomment-825038275, the removal of `#[main]` was expected to eliminate this conflict (previously reported as #62127).
```
error[E0659]: `main` is ambiguous
--> src/main.rs:3:3
|
3 | #[main]
| ^^^^ ambiguous name
|
= note: ambiguous because of a name conflict with a builtin attribute
= note: `main` could refer to a built-in attribute
```
[This error message can be confusing](https://stackoverflow.com/q/71024443/1114), as the mostly-removed `#[main]` attribute is not mentioned in any documentation.
Since the current availability of `#[main]` on stable seems unintentional, and to needlessly block use of the `main` identifier in the attribute namespace, this PR finishes removing the `#[main]` attribute as described in https://github.com/rust-lang/rust/issues/29634#issuecomment-274951753 by deleting it from `builtin_attrs.rs`, and adds two test cases to ensure that the attribute is no longer accepted and no longer conflicts with other attributes imported as `main`.
This PR brings back the `DW_AT_containing_type` attribute for vtables after it has accidentally been removed in #89597.
It also implements a more accurate description of vtables. Instead of describing them as an array of void pointers, the compiler will now emit a struct type description with a field for each entry of the vtable.
r? ``@wesleywiser``
This PR should fix issue https://github.com/rust-lang/rust/issues/93164.
~~The PR is blocked on https://github.com/rust-lang/rust/pull/93154 because both of them modify the `codegen/debug-vtable.rs` test case.~~
Matthias Krüger [Wed, 9 Feb 2022 22:29:55 +0000 (23:29 +0100)]
Rollup merge of #91443 - compiler-errors:bad_collect_into_slice, r=wesleywiser
Better suggestions when user tries to collect into an unsized `[_]`
1. Extend the predicate on `rustc_on_unimplemented` to support substitutions like note, label, etc (i.e. treat it as a `OnUnimplementedFormatString`) so we can have slightly more general `rustc_on_unimplemented` special-cases.
2. Add a `rustc_on_unimplemented` if we fail on `FromIterator<A> for [A]` which happens when we don't explicitly collect into a `vec<A>`, but then pass the return from a `.collect` call into something that takes a slice.
Noah Lev [Sat, 8 Jan 2022 00:30:01 +0000 (16:30 -0800)]
Refactor sidebar printing code
The new code is much simpler and easier to understand. In fact, the old
code actually had a subtle bug where it excluded a few item types,
including trait aliases, from the sidebar, even though they are rendered
on the page itself! Now, all sections should show up in the sidebar.
bors [Wed, 9 Feb 2022 18:54:30 +0000 (18:54 +0000)]
Auto merge of #93741 - Mark-Simulacrum:global-job-id, r=cjgillot
Refactor query system to maintain a global job id counter
This replaces the per-shard counters with a single global counter, simplifying
the JobId struct down to just a u64 and removing the need to pipe a DepKind
generic through a bunch of code. The performance implications on non-parallel
compilers are likely minimal (this switches to `Cell<u64>` as the backing
storage over a `u64`, but the latter was already inside a `RefCell` so it's not
really a significance divergence). On parallel compilers, the cost of a single
global u64 counter may be more significant: it adds a serialization point in
theory. On the other hand, we can imagine changing the counter to have a
thread-local component if it becomes worrisome or some similar structure.
The new design is sufficiently simpler that it warrants the potential for slight
changes down the line if/when we get parallel compilation to be more of a
default.
A u64 counter, instead of u32 (the old per-shard width), is chosen to avoid
possibly overflowing it and causing problems; it is effectively impossible that
we would overflow a u64 counter in this context.
bors [Wed, 9 Feb 2022 15:53:10 +0000 (15:53 +0000)]
Auto merge of #93724 - Mark-Simulacrum:drop-query-stats, r=michaelwoerister
Delete -Zquery-stats infrastructure
These statistics are computable from the self-profile data and/or ad-hoc collectable as needed, and in the meantime contribute to rustc bootstrap times -- locally, this PR shaves ~2.5% from rustc_query_impl builds in instruction counts.
If this does lose some functionality we want to keep, I think we should migrate it to self-profile (or a similar interface) rather than this ad-hoc reporting.
bors [Wed, 9 Feb 2022 12:51:53 +0000 (12:51 +0000)]
Auto merge of #93681 - Mark-Simulacrum:rlink-binary, r=davidtwco,bjorn3
Store rlink data in opaque binary format on disk
This removes one of the only uses of JSON decoding (to Rust structs) from the compiler, and fixes the FIXME comment. It's not clear to me what the reason for using JSON here originally was, and from what I can tell nothing outside of rustc expects to read the emitted information, so it seems like a reasonable step to move it to the metadata-encoding format (rustc_serialize::opaque).
Mostly intended as a FIXME fix, though potentially a stepping stone to dropping the support for Decodable to be used to decode JSON entirely (allowing for better/faster APIs on the Decoder trait).
bors [Wed, 9 Feb 2022 09:41:48 +0000 (09:41 +0000)]
Auto merge of #92306 - Aaron1011:opaque-type-op, r=oli-obk
Improve opaque type higher-ranked region error message under NLL
Currently, any higher-ranked region errors involving opaque types
fall back to a generic "higher-ranked subtype error" message when
run under NLL. This PR adds better error message handling for this
case, giving us the same kinds of error messages that we currently
get without NLL:
```
error: implementation of `MyTrait` is not general enough
--> $DIR/opaque-hrtb.rs:12:13
|
LL | fn foo() -> impl for<'a> MyTrait<&'a str> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `MyTrait` is not general enough
|
= note: `impl MyTrait<&'2 str>` must implement `MyTrait<&'1 str>`, for any lifetime `'1`...
= note: ...but it actually implements `MyTrait<&'2 str>`, for some specific lifetime `'2`
error: aborting due to previous error
```
To accomplish this, several different refactoring needed to be made:
* We now have a dedicated `InstantiateOpaqueType` struct which
implements `TypeOp`. This is used to invoke `instantiate_opaque_types`
during MIR type checking.
* `TypeOp` is refactored to pass around a `MirBorrowckCtxt`, which is
needed to report opaque type region errors.
* We no longer assume that all `TypeOp`s correspond to canonicalized
queries. This allows us to properly handle opaque type instantiation
(which does not occur in a query) as a `TypeOp`.
A new `ErrorInfo` associated type is used to determine what
additional information is used during higher-ranked region error
handling.
* The body of `try_extract_error_from_fulfill_cx`
has been moved out to a new function `try_extract_error_from_region_constraints`.
This allows us to re-use the same error reporting code between
canonicalized queries (which can extract region constraints directly
from a fresh `InferCtxt`) and opaque type handling (which needs to take
region constraints from the pre-existing `InferCtxt` that we use
throughout MIR borrow checking).
Yuki Okushi [Wed, 9 Feb 2022 05:12:24 +0000 (14:12 +0900)]
Rollup merge of #93751 - eholk:issue-93648-drop-tracking-projection, r=tmiasko
Drop tracking: track borrows of projections
Previous efforts to ignore partially consumed values meant we were also not considering borrows of a projection. This led to cases where we'd miss borrowed types which MIR expected to be there, leading to ICEs.
This PR also includes the `-Zdrop-tracking` flag from #93313. If that PR lands first, I'll rebase to drop the commit from this one.
Yuki Okushi [Wed, 9 Feb 2022 05:12:18 +0000 (14:12 +0900)]
Rollup merge of #93694 - jsha:font-sizes-spacing, r=GuillaumeGomez
rustdoc: tweak line spacing and paragraph spacing for accessibility
The [W3C Web Content Accessibility Guidelines](https://www.w3.org/WAI/WCAG21/Understanding/visual-presentation.html) specify a minimum line spacing of 1.5 and a minimum paragraph spacing of 1.5 times the line spacing. Our current line spacing (implemented by line-height) is 1.4, so it's a small bump to go up to 1.5. Similarly, we have a paragraph spacing of 0.6em. Bump that to 0.75em (which is 1.5 times the 0.5em distance between lines).
Also, fix all the font sizes so instead of being round-ish numbers in rem (like 1.1rem, 1.2rem), they are round numbers in pixels: 16px, 18px, 20px, 22px, 24px. Ensure each font size is at least 2 pixels different than the nearest other font size, so distinctions can be clearly seen. Overall the font-sizes are mostly staying the same, being rounded up or down as appropriate. This will make reasoning about consistent layout sizes much easier.
Remove a few unused styles.
Simplify the display of the mobile-topbar location, by setting its margins to auto rather than trying to size it exactly to the topbar.
Yuki Okushi [Wed, 9 Feb 2022 05:12:17 +0000 (14:12 +0900)]
Rollup merge of #93445 - yaahc:exitcode-constructor, r=dtolnay
Add From<u8> for ExitCode
This should cover a mostly cross-platform subset of supported exit codes.
We decided to stick with `u8` initially since its the common subset between all platforms that we support (excluding wasm which I think only works with `true` or `false`). Posix is supposed to take i32s, but in practice many unix platforms mask out all but the low 8 bits or in some cases the 8-15th bits. Windows takes a u32 instead of an i32. Bourne-compatible shells also report signals as exitcode 128 + `signal_no`, so there's some ambiguity there when returning exit codes > 127, but it is possible to disambiguate them on the other side so we decided against restricting the possible codes further than to `u8`.
## Related
- Detailed analysis of exit code support on various platforms: https://internals.rust-lang.org/t/mini-pre-rfc-redesigning-process-exitstatus/5426
- https://github.com/rust-lang/rust/issues/48711
- https://github.com/rust-lang/rust/issues/43301
- https://rust-lang.zulipchat.com/#narrow/stream/219381-t-libs/topic/Termination.2FExit.20Status.20Stabilization
bors [Wed, 9 Feb 2022 04:05:55 +0000 (04:05 +0000)]
Auto merge of #93793 - ehuss:update-cargo, r=ehuss
Update cargo
5 commits in 25fcb135d02ea897ce894b67ae021f48107d522b..c082648646cbb2be266df9ecbcdc253058158d68
2022-02-01 01:32:48 +0000 to 2022-02-08 14:55:05 +0000
- Add rustup link (rust-lang/cargo#10371)
- Improve startup time of bash completion. (rust-lang/cargo#10365)
- Stabilize `-Ztimings` as `--timings` (rust-lang/cargo#10245)
- Remove needless borrow (rust-lang/cargo#10360)
- Compute non custom build and non transitive deps for doc (rust-lang/cargo#10341)
bors [Wed, 9 Feb 2022 01:18:06 +0000 (01:18 +0000)]
Auto merge of #93778 - matthiaskrgr:rollup-yfngdao, r=matthiaskrgr
Rollup of 7 pull requests
Successful merges:
- #91950 (Point at type when a `static` `#[global_allocator]` doesn't `impl` `GlobalAlloc`)
- #92715 (Do not suggest char literal for zero-length strings)
- #92917 (Don't constrain projection predicates with inference vars in GAT substs)
- #93206 (Use `NtCreateFile` instead of `NtOpenFile` to open a file)
- #93732 (add fut/back compat tests for implied trait bounds)
- #93764 (:arrow_up: rust-analyzer)
- #93767 (deduplicate `lcnr` in mailmap)
Mark Rousskov [Mon, 7 Feb 2022 16:03:51 +0000 (11:03 -0500)]
Switch QueryJobId to a single global counter
This replaces the per-shard counters with a single global counter, simplifying
the JobId struct down to just a u64 and removing the need to pipe a DepKind
generic through a bunch of code. The performance implications on non-parallel
compilers are likely minimal (this switches to `Cell<u64>` as the backing
storage over a `u64`, but the latter was already inside a `RefCell` so it's not
really a significance divergence). On parallel compilers, the cost of a single
global u64 counter may be more significant: it adds a serialization point in
theory. On the other hand, we can imagine changing the counter to have a
thread-local component if it becomes worrisome or some similar structure.
The new design is sufficiently simpler that it warrants the potential for slight
changes down the line if/when we get parallel compilation to be more of a
default.
A u64 counter, instead of u32 (the old per-shard width), is chosen to avoid
possibly overflowing it and causing problems; it is effectively impossible that
we would overflow a u64 counter in this context.
bors [Tue, 8 Feb 2022 20:50:41 +0000 (20:50 +0000)]
Auto merge of #8374 - Alexendoo:bless-revisions, r=camsteffen
Support `cargo dev bless` for tests with revisions
changelog: internal: Support `cargo dev bless` for tests with revisions
Previously bless wouldn't pick up the saved stderr from `target/debug/tests/manual_assert.stage-id.edition2021.stderr` or `target/debug/tests/manual_assert.stage-id.edition2018.stderr` due to there being multiple revisions of the test output
This tweaks compile-test so the built files end up in e.g. `target/debug/tests/ui`, `target/debug/tests/ui-cargo` rather than share the `tests` dir. `cargo dev bless` then uses that to update all the `.stdout/stdout/fixed` files it can find
Also removes an empty file I found, and the logic to remove empty outputs as compiletest doesn't produce empty `.stdout/stderr` files
Aaron Hill [Sun, 19 Dec 2021 00:06:53 +0000 (19:06 -0500)]
Improve opaque type higher-ranked region error message under NLL
Currently, any higher-ranked region errors involving opaque types
fall back to a generic "higher-ranked subtype error" message when
run under NLL. This PR adds better error message handling for this
case, giving us the same kinds of error messages that we currently
get without NLL:
```
error: implementation of `MyTrait` is not general enough
--> $DIR/opaque-hrtb.rs:12:13
|
LL | fn foo() -> impl for<'a> MyTrait<&'a str> {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ implementation of `MyTrait` is not general enough
|
= note: `impl MyTrait<&'2 str>` must implement `MyTrait<&'1 str>`, for any lifetime `'1`...
= note: ...but it actually implements `MyTrait<&'2 str>`, for some specific lifetime `'2`
error: aborting due to previous error
```
To accomplish this, several different refactoring needed to be made:
* We now have a dedicated `InstantiateOpaqueType` struct which
implements `TypeOp`. This is used to invoke `instantiate_opaque_types`
during MIR type checking.
* `TypeOp` is refactored to pass around a `MirBorrowckCtxt`, which is
needed to report opaque type region errors.
* We no longer assume that all `TypeOp`s correspond to canonicalized
queries. This allows us to properly handle opaque type instantiation
(which does not occur in a query) as a `TypeOp`.
A new `ErrorInfo` associated type is used to determine what
additional information is used during higher-ranked region error
handling.
* The body of `try_extract_error_from_fulfill_cx`
has been moved out to a new function `try_extract_error_from_region_constraints`.
This allows us to re-use the same error reporting code between
canonicalized queries (which can extract region constraints directly
from a fresh `InferCtxt`) and opaque type handling (which needs to take
region constraints from the pre-existing `InferCtxt` that we use
throughout MIR borrow checking).
Matthias Krüger [Tue, 8 Feb 2022 15:40:49 +0000 (16:40 +0100)]
Rollup merge of #93206 - ChrisDenton:ntopenfile, r=nagisa
Use `NtCreateFile` instead of `NtOpenFile` to open a file
Generally the internal `Nt*` functions should be avoided but when we do need to use one we should stick to the most commonly used for the job. To that end, this PR replaces `NtOpenFile` with `NtCreateFile`.
NOTE: The initial version of this comment hypothesised that this may help with some recent false positives from malware scanners. This hypothesis proved wrong. Sorry for the distraction.
Matthias Krüger [Tue, 8 Feb 2022 15:40:48 +0000 (16:40 +0100)]
Rollup merge of #92917 - jackh726:issue-91762-2, r=nikomatsakis
Don't constrain projection predicates with inference vars in GAT substs
cc #91762
Not a fix, but a mitigation to prevent a backwards-compatible hazard where we normalize using a predicate only because it's the only one available, but shouldn't. This would constrain an inference variable which didn't really want. We already do this when selecting a projection candidate, which isn't always correct. But changing that is a problem for a different day.
Also found out that a suggestion for `await`ing a future was using the wrong substs.
projects / rust.git / log