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Warn on inductive cycle in coherence leading to impls being considered not overlapping #114023

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merged 5 commits into from
Aug 15, 2023
Merged

Warn on inductive cycle in coherence leading to impls being considered not overlapping #114023

merged 5 commits into from
Aug 15, 2023

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@compiler-errors compiler-errors commented Jul 24, 2023 •
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This PR implements a coinductive_overlap_in_coherence lint (#114040), which warns users against cases where two impls are considered not to overlap during coherence due to an inductive cycle disproving one of the predicates after unifying the two impls.

Cases where this lint fires will become an overlap error if we ever move to coinduction, so I'd like to make this a warning to avoid having more crates take advantage of this behavior in the mean time. Also, since the new trait solver treats inductive cycles as ambiguity, not an error, this is a blocker for landing the new trait solver in coherence.

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 24, 2023
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I agree with this approach: crater into fcp merge?

@lcnr lcnr added needs-fcp This change is insta-stable, so needs a completed FCP to proceed. T-types Relevant to the types team, which will review and decide on the PR/issue. and removed T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Jul 24, 2023
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@compiler-errors compiler-errors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jul 24, 2023
@compiler-errors compiler-errors mentioned this pull request Jul 25, 2023
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@rust-cloud-vms rust-cloud-vms bot force-pushed the coinductive-cycle-lint branch from 2c6551e to c68c758 Compare July 25, 2023 01:49
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@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 25, 2023
@compiler-errors compiler-errors marked this pull request as ready for review July 25, 2023 01:49
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bors commented Jul 25, 2023

⌛ Trying commit c68c7587a9f24c40ba2a0c7bc44e8d922b1e8402 with merge 57deb92fd9a925033e74c42843970397973b9cc4...

@compiler-errors compiler-errors changed the title Warn on coinductive cycle in coherence leading to impls being considered not overlapping Warn on inductive cycle in coherence leading to impls being considered not overlapping Jul 25, 2023
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bors commented Jul 25, 2023

☀️ Try build successful - checks-actions
Build commit: 57deb92fd9a925033e74c42843970397973b9cc4 (57deb92fd9a925033e74c42843970397973b9cc4)

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lcnr commented Jul 25, 2023

a crater run would need the lint as deny afaik

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@rust-cloud-vms rust-cloud-vms bot force-pushed the coinductive-cycle-lint branch from 4ec05ea to eecc891 Compare July 25, 2023 16:49
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@bors try

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bors commented Jul 25, 2023

⌛ Testing commit df609e42931aea92ceccb4aacf9fe9ce7e923b4f with merge 9018f9da0e8719f5f9fc4ffee4d635b24bf69ad2...

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@rust-cloud-vms rust-cloud-vms bot force-pushed the coinductive-cycle-lint branch from 3aaaff5 to 0e20155 Compare August 15, 2023 03:44
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@bors r=lcnr

rebased and fixed lint description

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bors commented Aug 15, 2023

📌 Commit 0e20155 has been approved by lcnr

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Aug 15, 2023
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bors commented Aug 15, 2023

⌛ Testing commit 0e20155 with merge a32978a...

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bors commented Aug 15, 2023

☀️ Test successful - checks-actions
Approved by: lcnr
Pushing a32978a to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Aug 15, 2023
@bors bors merged commit a32978a into rust-lang:master Aug 15, 2023
@rustbot rustbot added this to the 1.73.0 milestone Aug 15, 2023
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Finished benchmarking commit (a32978a): comparison URL.

Overall result: ❌ regressions - ACTION NEEDED

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 1.3% [0.6%, 2.5%] 10
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 1.3% [0.6%, 2.5%] 10

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 1.6% [1.4%, 2.0%] 4
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 -2.4% [-3.2%, -1.6%] 4
Improvements ✅
(secondary)		 -2.1% [-2.4%, -1.8%] 2
All ❌✅ (primary) -0.4% [-3.2%, 2.0%] 8

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 2.6% [2.0%, 3.6%] 4
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 2.6% [2.0%, 3.6%] 4

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 631.44s -> 631.653s (0.03%)
Artifact size: 346.64 MiB -> 346.73 MiB (0.03%)

@compiler-errors compiler-errors mentioned this pull request Aug 15, 2023
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@apiraino apiraino removed the to-announce Announce this issue on triage meeting label Aug 18, 2023
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rylev commented Aug 22, 2023

@compiler-errors @lcnr the perf regression seems real here. I saw that a perf run was already performed which had similar results, and there was no discussion of why that regression is acceptable. Would you be able to comment on that?

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Oof yeah, I totally passed over this.

This should be a temporary lint, so it'll get "reverted" in the future (well, moved to a final state that ideally does less work).

Not sure if things are slower because we're running things twice (in order to impl the lint), or due fundamental changes to the way we cache things that we're moving to in the future (treating overflows as ambiguity).

Let me start a perf run to actually show what performance is like in the final state -- once we've totally moved onto the new coherence behavior. That should answer the question above.

@compiler-errors compiler-errors mentioned this pull request Aug 22, 2023
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@compiler-errors compiler-errors mentioned this pull request Aug 30, 2023
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bors added a commit to rust-lang-ci/rust that referenced this pull request Aug 31, 2023
@bors
Auto merge of rust-lang#115392 - compiler-errors:coherence-spans, r=a…
e51c5ea 
…liemjay

Don't record spans for predicates in coherence

Should improve perf (rust-lang#115107 (comment)) for rust-lang#114023 (comment)

r? aliemjay
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@rylev perf fixed in #115392 (comment)

wip-sync pushed a commit to NetBSD/pkgsrc-wip that referenced this pull request Oct 6, 2023
@jperkin
rust: Upgrade to 1.73.0.
3a92f61 
Language
--------

- [Uplift `clippy::fn_null_check` lint as `useless_ptr_null_checks`.]
  (rust-lang/rust#111717)
- [Make `noop_method_call` warn by default.]
  (rust-lang/rust#111916)
- [Support interpolated block for `try` and `async` in macros.]
  (rust-lang/rust#112953)
- [Make `unconditional_recursion` lint detect recursive drops.]
  (rust-lang/rust#113902)
- [Future compatibility warning for some impls being incorrectly
  considered not overlapping.]
  (rust-lang/rust#114023)
- [The `invalid_reference_casting` lint is now **deny-by-default**
  (instead of allow-by-default)]
  (rust-lang/rust#112431)

Compiler
--------

- [Write version information in a `.comment` section like GCC/Clang.]
  (rust-lang/rust#97550)
- [Add documentation on v0 symbol mangling.]
  (rust-lang/rust#97571)
- [Stabilize `extern "thiscall"` and `"thiscall-unwind"` ABIs.]
  (rust-lang/rust#114562)
- [Only check outlives goals on impl compared to trait.]
  (rust-lang/rust#109356)
- [Infer type in irrefutable slice patterns with fixed length as array.]
  (rust-lang/rust#113199)
- [Discard default auto trait impls if explicit ones exist.]
  (rust-lang/rust#113312)
- Add several new tier 3 targets:
    - [`aarch64-unknown-teeos`]
      (rust-lang/rust#113480)
    - [`csky-unknown-linux-gnuabiv2`]
      (rust-lang/rust#113658)
    - [`riscv64-linux-android`]
      (rust-lang/rust#112858)
    - [`riscv64gc-unknown-hermit`]
      (rust-lang/rust#114004)
    - [`x86_64-unikraft-linux-musl`]
      (rust-lang/rust#113411)
    - [`x86_64-unknown-linux-ohos`]
      (rust-lang/rust#113061)
- [Add `wasm32-wasi-preview1-threads` as a tier 2 target.]
  (rust-lang/rust#112922)

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries
---------

- [Add `Read`, `Write` and `Seek` impls for `Arc<File>`.]
  (rust-lang/rust#94748)
- [Merge functionality of `io::Sink` into `io::Empty`.]
  (rust-lang/rust#98154)
- [Implement `RefUnwindSafe` for `Backtrace`]
  (rust-lang/rust#100455)
- [Make `ExitStatus` implement `Default`]
  (rust-lang/rust#106425)
- [`impl SliceIndex<str> for (Bound<usize>, Bound<usize>)`]
  (rust-lang/rust#111081)
- [Change default panic handler message format.]
  (rust-lang/rust#112849)
- [Cleaner `assert_eq!` & `assert_ne!` panic messages.]
  (rust-lang/rust#111071)
- [Correct the (deprecated) Android `stat` struct definitions.]
  (rust-lang/rust#113130)

Stabilized APIs
---------------

- [Unsigned `{integer}::div_ceil`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.div_ceil)
- [Unsigned `{integer}::next_multiple_of`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.next_multiple_of)
- [Unsigned `{integer}::checked_next_multiple_of`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.checked_next_multiple_of)
- [`std::ffi::FromBytesUntilNulError`]
  (https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html)
- [`std::os::unix::fs::chown`]
  (https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chown.html)
- [`std::os::unix::fs::fchown`]
  (https://doc.rust-lang.org/stable/std/os/unix/fs/fn.fchown.html)
- [`std::os::unix::fs::lfchown`]
  (https://doc.rust-lang.org/stable/std/os/unix/fs/fn.lchown.html)
- [`LocalKey::<Cell<T>>::get`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.get)
- [`LocalKey::<Cell<T>>::set`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set)
- [`LocalKey::<Cell<T>>::take`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take)
- [`LocalKey::<Cell<T>>::replace`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace)
- [`LocalKey::<RefCell<T>>::with_borrow`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow)
- [`LocalKey::<RefCell<T>>::with_borrow_mut`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow_mut)
- [`LocalKey::<RefCell<T>>::set`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set-1)
- [`LocalKey::<RefCell<T>>::take`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take-1)
- [`LocalKey::<RefCell<T>>::replace`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace-1)

These APIs are now stable in const contexts:

- [`rc::Weak::new`]
  (https://doc.rust-lang.org/stable/alloc/rc/struct.Weak.html#method.new)
- [`sync::Weak::new`]
  (https://doc.rust-lang.org/stable/alloc/sync/struct.Weak.html#method.new)
- [`NonNull::as_ref`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.as_ref)

Cargo
-----

- [Encode URL params correctly for `SourceId` in `Cargo.lock`.]
  (rust-lang/cargo#12280)
- [Bail out an error when using `cargo::` in custom build script.]
  (rust-lang/cargo#12332)

Compatibility Notes
-------------------

- [Update the minimum external LLVM to 15.]
  (rust-lang/rust#114148)
- [Check for non-defining uses of return position `impl Trait`.]
  (rust-lang/rust#112842)

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they represent
significant improvements to the performance or internals of rustc and related
tools.

- [Remove LLVM pointee types, supporting only opaque pointers.]
  (rust-lang/rust#105545)
- [Port PGO/LTO/BOLT optimized build pipeline to Rust.]
  (rust-lang/rust#112235)
- [Replace in-tree `rustc_apfloat` with the new version of the crate.]
  (rust-lang/rust#113843)
- [Update to LLVM 17.]
  (rust-lang/rust#114048)
- [Add `internal_features` lint for internal unstable features.]
  (rust-lang/rust#108955)
- [Mention style for new syntax in tracking issue template.]
  (rust-lang/rust#113586)
@compiler-errors compiler-errors deleted the coinductive-cycle-lint branch October 6, 2023 19:40
netbsd-srcmastr pushed a commit to NetBSD/pkgsrc that referenced this pull request Nov 16, 2023
@he32
rust: Upgrade to version 1.73.0.
9081e36 
Pkgsrc changes:
 * Adjust patches and cargo checksums to new versions.
 * For an external LLVM, set dependency of llvm >= 15, in accordance
   with the upstream changes.
 * Add a patch with a backport from LLVM 17.0.3 fixing codegen for
   PPC, ref. rust-lang/rust#116845

Upstream changes:

Version 1.73.0 (2023-10-05)
==========================

Language
--------

- [Uplift `clippy::fn_null_check` lint as `useless_ptr_null_checks`.]
  (rust-lang/rust#111717)
- [Make `noop_method_call` warn by default.]
  (rust-lang/rust#111916)
- [Support interpolated block for `try` and `async` in macros.]
  (rust-lang/rust#112953)
- [Make `unconditional_recursion` lint detect recursive drops.]
  (rust-lang/rust#113902)
- [Future compatibility warning for some impls being incorrectly
  considered not overlapping.]
  (rust-lang/rust#114023)
- [The `invalid_reference_casting` lint is now **deny-by-default**
  (instead of allow-by-default)]
  (rust-lang/rust#112431

Compiler
--------

- [Write version information in a `.comment` section like GCC/Clang.]
  (rust-lang/rust#97550)
- [Add documentation on v0 symbol mangling.]
  (rust-lang/rust#97571)
- [Stabilize `extern "thiscall"` and `"thiscall-unwind"` ABIs.]
  (rust-lang/rust#114562)
- [Only check outlives goals on impl compared to trait.]
  (rust-lang/rust#109356)
- [Infer type in irrefutable slice patterns with fixed length as array.]
  (rust-lang/rust#113199)
- [Discard default auto trait impls if explicit ones exist.]
  (rust-lang/rust#113312)
- Add several new tier 3 targets:
    - [`aarch64-unknown-teeos`]
      (rust-lang/rust#113480)
    - [`csky-unknown-linux-gnuabiv2`]
      (rust-lang/rust#113658)
    - [`riscv64-linux-android`]
      (rust-lang/rust#112858)
    - [`riscv64gc-unknown-hermit`]
      (rust-lang/rust#114004)
    - [`x86_64-unikraft-linux-musl`]
      (rust-lang/rust#113411)
    - [`x86_64-unknown-linux-ohos`]
      (rust-lang/rust#113061)
- [Add `wasm32-wasi-preview1-threads` as a tier 2 target.]
  (rust-lang/rust#112922)

Refer to Rust's [platform support page][platform-support-doc]
for more information on Rust's tiered platform support.

Libraries
---------

- [Add `Read`, `Write` and `Seek` impls for `Arc<File>`.]
  (rust-lang/rust#94748)
- [Merge functionality of `io::Sink` into `io::Empty`.]
  (rust-lang/rust#98154)
- [Implement `RefUnwindSafe` for `Backtrace`]
  (rust-lang/rust#100455)
- [Make `ExitStatus` implement `Default`]
  (rust-lang/rust#106425)
- [`impl SliceIndex<str> for (Bound<usize>, Bound<usize>)`]
  (rust-lang/rust#111081)
- [Change default panic handler message format.]
  (rust-lang/rust#112849)
- [Cleaner `assert_eq!` & `assert_ne!` panic messages.]
  (rust-lang/rust#111071)
- [Correct the (deprecated) Android `stat` struct definitions.]
  (rust-lang/rust#113130)

Stabilized APIs
---------------

- [Unsigned `{integer}::div_ceil`]
  (https://doc.rust-lang.org/stable/std/primitiv e.u32.html#method.div_ceil)
- [Unsigned `{integer}::next_multiple_of`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.next_multiple_of)
- [Unsigned `{integer}::checked_next_multiple_of`]
  (https://doc.rust-lang.org/stable/std/primitive.u32.html#method.checked_next_multiple_of)
- [`std::ffi::FromBytesUntilNulError`]
  (https://doc.rust-lang.org/stable/std/ffi/struct.FromBytesUntilNulError.html)
- [`std::os::unix::fs::chown`]
  (https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chown.html)
- [`std::os::unix::fs::fchown`]
  (https://doc.rust-lang.org/stable/std/os/unix/fs/fn.fchown.html)
- [`std::os::unix::fs::lfchown`]
  (https://doc.rust-lang.org/stable/std/os/unix/fs/fn.lchown.html)
- [`LocalKey::<Cell<T>>::get`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.get)
- [`LocalKey::<Cell<T>>::set`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set)
- [`LocalKey::<Cell<T>>::take`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take)
- [`LocalKey::<Cell<T>>::replace`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace)
- [`LocalKey::<RefCell<T>>::with_borrow`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow)
- [`LocalKey::<RefCell<T>>::with_borrow_mut`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.with_borrow_mut)
- [`LocalKey::<RefCell<T>>::set`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.set-1)
- [`LocalKey::<RefCell<T>>::take`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.take-1)
- [`LocalKey::<RefCell<T>>::replace`]
  (https://doc.rust-lang.org/stable/std/thread/struct.LocalKey.html#method.replace-1)

These APIs are now stable in const contexts:

- [`rc::Weak::new`]
  (https://doc.rust-lang.org/stable/alloc/rc/struct.Weak.html#method.new)
- [`sync::Weak::new`]
  (https://doc.rust-lang.org/stable/alloc/sync/struct.Weak.html#method.new)
- [`NonNull::as_ref`]
  (https://doc.rust-lang.org/stable/core/ptr/struct.NonNull.html#method.as_ref)

Cargo
-----

- [Encode URL params correctly for `SourceId` in `Cargo.lock`.]
  (rust-lang/cargo#12280)
- [Bail out an error when using `cargo::` in custom build script.]
  (rust-lang/cargo#12332)

Misc
----

Compatibility Notes
-------------------

- [Update the minimum external LLVM to 15.]
  (rust-lang/rust#114148)
- [Check for non-defining uses of return position `impl Trait`.]
  (rust-lang/rust#112842)

Internal Changes
----------------

These changes do not affect any public interfaces of Rust, but they
represent significant improvements to the performance or internals
of rustc and related tools.

- [Remove LLVM pointee types, supporting only opaque pointers.]
  (rust-lang/rust#105545)
- [Port PGO/LTO/BOLT optimized build pipeline to Rust.]
  (rust-lang/rust#112235)
- [Replace in-tree `rustc_apfloat` with the new version of the crate.]
  (rust-lang/rust#113843)
- [Update to LLVM 17.]
  (rust-lang/rust#114048)
- [Add `internal_features` lint for internal unstable features.]
  (rust-lang/rust#108955)
- [Mention style for new syntax in tracking issue template.]
  (rust-lang/rust#113586)
@lcnr lcnr mentioned this pull request Dec 8, 2023
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