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Make subtyping explicit in MIR #115025

Merged
merged 4 commits into from
Oct 3, 2023
Merged

Make subtyping explicit in MIR #115025

merged 4 commits into from
Oct 3, 2023

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ouz-a
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@ouz-a ouz-a commented Aug 20, 2023

This adds new mir-opt that pushes new ProjectionElem called ProjectionElem::Subtype(T) to Rvalue of a subtyped assignment so we can unsoundness issues like #107205

Addresses #112651

r? @lcnr

@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 Aug 20, 2023
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rustbot commented Aug 20, 2023

Some changes occurred to the CTFE / Miri engine

cc @rust-lang/miri

This PR changes MIR

cc @oli-obk, @RalfJung, @JakobDegen, @davidtwco, @celinval, @vakaras

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

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rustbot commented Aug 21, 2023

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

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rustbot commented Aug 21, 2023

Some changes occurred in src/tools/clippy

cc @rust-lang/clippy

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I am quite confused by the fact that this is added as a mir-opt. A mir-opt can never change the meaning of a program. So this means that MIR is valid even without these subtyping projections. But this also means this approach is unsuited to prevent any bugs, since it would be completely okay for code to alter MIR without adding these projections.

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@ouz-a
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ouz-a commented Aug 21, 2023

I am quite confused by the fact that this is added as a mir-opt. A mir-opt can never change the meaning of a program. So this means that MIR is valid even without these subtyping projections. But this also means this approach is unsuited to prevent any bugs, since it would be completely okay for code to alter MIR without adding these projections.

I'm implementing this with suggestions from @lcnr, they will give the details better than I do, but as far as I understand our goal here is to make subtyping explicit and easy to see/debug, and return ICE instead of unsound code. How should we approach this problem if not with mir-opt. Some discussions regarding this mir-opt are here #107205 (comment) and here #112307 (comment) .

Thanks for the reviews!

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RalfJung commented Aug 21, 2023

Well the primary choice to make is whether MIR without explicit subtyping is still considered valid or not. If it is valid, then codegen must be able to handle it, and this new pass doesn't really change that. If it is not valid, then MIR building should already introduce the required subtyping projections. Ever having invalid MIR is a potential problem. After all, if codegen gets subtyping wrong, why would other MIR consumers do any better? Why only protect codegen with this new pass?

There's also the option of making this a new MIR phase, but we should have very good justification to introduce a new phase since those come with overhead in terms of specification and always having to ensure each MIR pass only runs on MIR that is in a phase it can work with.

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lcnr commented Aug 26, 2023

I don't think subtyping can sensibly be explicit before mir borrowck, because we'd have to add subtyping projections everywhere as we don't have borrowck information. After borrowck, we only care about subtyping which can impact trait selection/TypeId, i.e. subtyping which affects the type after erasing all free regons.

Having this subtyping be explicit during optimization and codegen is dangerous, so my goal is to make it full explicit before any optimizations are run. I believe that subtyping should always be fully explicit (and checked by the validator) in MirPhase::Runtime. MIR with implicit subtyping during this phase will be invalid.

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RalfJung commented Aug 27, 2023

Having this subtyping be explicit during optimization and codegen is dangerous

I assume you mean "implicit" is dangerous?
I'm fine with making this an analysis MIR vs runtime MIR thing. That should be properly reflected in validation and documentation.

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unsure about the ICE, probably makes sense to only enable this transformation with a flag and then enable that flag while compiling UI tests or sth

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@ouz-a
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ouz-a commented Aug 30, 2023

unsure about the ICE, probably makes sense to only enable this transformation with a flag and then enable that flag while compiling UI tests or sth

Problem is this also ICEs on some of the ui tests

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oli-obk commented Aug 30, 2023

Problem is this also ICEs on some of the ui tests

yes, but it is easier to debug then ;)

@rustbot rustbot added the T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) label Sep 3, 2023
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rustbot commented Sep 3, 2023

This PR changes src/bootstrap/defaults/config.compiler.toml. If appropriate, please also update config.codegen.toml so the defaults are in sync.

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Finished benchmarking commit (eb0f3ed): comparison URL.

Overall result: ❌✅ regressions and improvements - 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)
0.6% [0.4%, 0.8%] 2
Regressions ❌
(secondary)
0.5% [0.1%, 1.1%] 17
Improvements ✅
(primary)
-0.5% [-0.6%, -0.5%] 2
Improvements ✅
(secondary)
-0.5% [-0.5%, -0.5%] 1
All ❌✅ (primary) 0.0% [-0.6%, 0.8%] 4

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)
3.8% [2.7%, 4.4%] 3
Regressions ❌
(secondary)
3.2% [3.2%, 3.2%] 1
Improvements ✅
(primary)
-5.2% [-9.3%, -0.1%] 3
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) -0.7% [-9.3%, 4.4%] 6

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)
- - 0
Regressions ❌
(secondary)
- - 0
Improvements ✅
(primary)
- - 0
Improvements ✅
(secondary)
-2.9% [-3.6%, -2.2%] 2
All ❌✅ (primary) - - 0

Binary size

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)
0.1% [0.0%, 0.5%] 17
Regressions ❌
(secondary)
0.1% [0.0%, 0.2%] 12
Improvements ✅
(primary)
-0.2% [-0.3%, -0.1%] 10
Improvements ✅
(secondary)
- - 0
All ❌✅ (primary) 0.0% [-0.3%, 0.5%] 27

Bootstrap: 623.042s -> 620.328s (-0.44%)
Artifact size: 271.97 MiB -> 272.00 MiB (0.01%)

@rustbot rustbot added the perf-regression Performance regression. label Oct 3, 2023
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rylev commented Oct 3, 2023

@ouz-a @lcnr Perf is mostly neutral in primary benchmarks, but there do seem to be more regressions in secondary benchmarks. I imagine these might be expected if we're strictly doing more work in some of those cases?

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lcnr commented Oct 3, 2023

yeah, we should have probably done a perf run before merging 😅 #112651 (comment) may slightly improve it again, but we do end up simply doing more work

bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 5, 2023
23: Fix divergence from upstream `master` r=tshepang a=pvdrz

* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
  * rust-lang/rust#113053
* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
  * rust-lang/rust#116350
  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
  * rust-lang/rust#116295
  * rust-lang/rust#116292
* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986



Co-authored-by: ouz-a <ouz.agz@gmail.com>
Co-authored-by: Jakub Beránek <berykubik@gmail.com>
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flip1995 pushed a commit to flip1995/rust that referenced this pull request Oct 6, 2023
Make subtyping explicit in MIR

This adds new mir-opt that pushes new `ProjectionElem` called `ProjectionElem::Subtype(T)` to `Rvalue` of a subtyped assignment so we can unsoundness issues like rust-lang#107205

Addresses rust-lang#112651

r? `@lcnr`
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 6, 2023
23: Fix divergence from upstream `master` r=tshepang a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
  * rust-lang/rust#116452
  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
  * rust-lang/rust#116432
  * rust-lang/rust#116431
  * rust-lang/rust#116429
  * rust-lang/rust#116296
  * rust-lang/rust#116223
* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
  * rust-lang/rust#113053
* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
  * rust-lang/rust#116350
  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
  * rust-lang/rust#116295
  * rust-lang/rust#116292
* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

Co-authored-by: ouz-a <ouz.agz@gmail.com>
Co-authored-by: bors <bors@rust-lang.org>
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bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 9, 2023
23: Fix divergence from upstream `master` r=pietroalbini a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
  * rust-lang/rust#116452
  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
  * rust-lang/rust#116432
  * rust-lang/rust#116431
  * rust-lang/rust#116429
  * rust-lang/rust#116296
  * rust-lang/rust#116223
* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
  * rust-lang/rust#113053
* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
  * rust-lang/rust#116350
  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
  * rust-lang/rust#116295
  * rust-lang/rust#116292
* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

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bjorn3 pushed a commit to bjorn3/rust that referenced this pull request Oct 9, 2023
Make subtyping explicit in MIR

This adds new mir-opt that pushes new `ProjectionElem` called `ProjectionElem::Subtype(T)` to `Rvalue` of a subtyped assignment so we can unsoundness issues like rust-lang#107205

Addresses rust-lang#112651

r? `@lcnr`
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 9, 2023
23: Fix divergence from upstream `master` r=Dajamante a=pvdrz

* rust-lang/rust#116483
  * rust-lang/rust#116475
  * rust-lang/rust#116329
  * rust-lang/rust#116198
  * rust-lang/rust#115588
  * rust-lang/rust#115522
  * rust-lang/rust#115454
* rust-lang/rust#111595
* rust-lang/rust#116018
* rust-lang/rust#116472
  * rust-lang/rust#116469
  * rust-lang/rust#116421
* rust-lang/rust#116463
* rust-lang/rust#101150
* rust-lang/rust#116269
* rust-lang/rust#116417
* rust-lang/rust#116455
  * rust-lang/rust#116452
  * rust-lang/rust#116428
  * rust-lang/rust#116415
  * rust-lang/rust#116288
  * rust-lang/rust#116220
* rust-lang/rust#103046
* rust-lang/rust#114042
* rust-lang/rust#104153
* rust-lang/rust#116427
* rust-lang/rust#116443
  * rust-lang/rust#116432
  * rust-lang/rust#116431
  * rust-lang/rust#116429
  * rust-lang/rust#116296
  * rust-lang/rust#116223
* rust-lang/rust#116273
* rust-lang/rust#116184
* rust-lang/rust#116370
* rust-lang/rust#114417
* rust-lang/rust#115200
* rust-lang/rust#116413
* rust-lang/rust#116381
* rust-lang/rust#116360
* rust-lang/rust#116353
* rust-lang/rust#116406
* rust-lang/rust#116408
  * rust-lang/rust#116395
  * rust-lang/rust#116393
  * rust-lang/rust#116388
  * rust-lang/rust#116365
  * rust-lang/rust#116363
  * rust-lang/rust#116146
  * rust-lang/rust#115961
* rust-lang/rust#116386
* rust-lang/rust#116367
* rust-lang/rust#105394
* rust-lang/rust#115301
* rust-lang/rust#116384
  * rust-lang/rust#116379
  * rust-lang/rust#116328
  * rust-lang/rust#116282
  * rust-lang/rust#116261
  * rust-lang/rust#114654
* rust-lang/rust#116376
  * rust-lang/rust#116374
  * rust-lang/rust#116371
  * rust-lang/rust#116358
  * rust-lang/rust#116210
  * rust-lang/rust#115863
* rust-lang/rust#115025
* rust-lang/rust#116372
  * rust-lang/rust#116361
  * rust-lang/rust#116355
  * rust-lang/rust#116351
  * rust-lang/rust#116158
  * rust-lang/rust#115726
  * rust-lang/rust#113053
* rust-lang/rust#116083
* rust-lang/rust#102099
* rust-lang/rust#116356
  * rust-lang/rust#116350
  * rust-lang/rust#116349
  * rust-lang/rust#116289
  * rust-lang/rust#114454
  * rust-lang/rust#114453
* rust-lang/rust#116331
* rust-lang/rust#116346
  * rust-lang/rust#116340
  * rust-lang/rust#116326
  * rust-lang/rust#116313
* rust-lang/rust#116276
* rust-lang/rust#115898
* rust-lang/rust#116325
* rust-lang/rust#116317
* rust-lang/rust#116207
* rust-lang/rust#116281
* rust-lang/rust#116304
* rust-lang/rust#116259
* rust-lang/rust#116228
* rust-lang/rust#116224
* rust-lang/rust#115554
* rust-lang/rust#116311
  * rust-lang/rust#116299
  * rust-lang/rust#116295
  * rust-lang/rust#116292
* rust-lang/rust#116307
* rust-lang/rust#115670
* rust-lang/rust#116225
* rust-lang/rust#116302
* rust-lang/rust#116108
* rust-lang/rust#116160
* rust-lang/rust#116157
* rust-lang/rust#116127
* rust-lang/rust#116286
* rust-lang/rust#116254
* rust-lang/rust#116195
* rust-lang/rust#116280
* rust-lang/rust#115933
* rust-lang/rust#115546
* rust-lang/rust#115368
* rust-lang/rust#116275
  * rust-lang/rust#116263
  * rust-lang/rust#116241
  * rust-lang/rust#116216
  * rust-lang/rust#116030
  * rust-lang/rust#116024
  * rust-lang/rust#112123
* rust-lang/rust#113301
* rust-lang/rust#113797
* rust-lang/rust#115759
* rust-lang/rust#116260
  * rust-lang/rust#116253
  * rust-lang/rust#116245
  * rust-lang/rust#116239
  * rust-lang/rust#116234
  * rust-lang/rust#116231
  * rust-lang/rust#116201
  * rust-lang/rust#116133
* rust-lang/rust#116176
* rust-lang/rust#116089
* rust-lang/rust#115986

35: Automated pull from `rust-lang/libc` r=pietroalbini a=github-actions[bot]

This PR pulls the following changes from the [`rust-lang/libc`](https://github.com/rust-lang/libc) repository:

* rust-lang/libc#3335
* rust-lang/libc#3373
* rust-lang/libc#3360
* rust-lang/libc#3374
* rust-lang/libc#3375
* rust-lang/libc#3376
* rust-lang/libc#3377


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Co-authored-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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Co-authored-by: Ralf Jung <post@ralfj.de>
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@Mark-Simulacrum Mark-Simulacrum added the stable-nominated Nominated for backporting to the compiler in the stable channel. label Dec 4, 2023
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Nominating for stable as it's a dependency of the approved #116415 PR.

bors added a commit to rust-lang-ci/rust that referenced this pull request Dec 4, 2023
…Simulacrum

[stable] 1.74.1 release

This includes backports of:

*  Dispose llvm::TargetMachines prior to llvm::Context being disposed rust-lang#118464
*  clarify fn discriminant guarantees: only free lifetimes may get erased rust-lang#118006
*  Move subtyper below reveal_all and change reveal_all rust-lang#116415
   *  Make subtyping explicit in MIR rust-lang#115025 (needed for above)

As well as infrastructure fix:

*  Don't ask for a specific branch in cargotest rust-lang#118597

r? `@Mark-Simulacrum`
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Already backported and included in 1.74.1, marking as such.

@Mark-Simulacrum Mark-Simulacrum added stable-accepted Accepted for backporting to the compiler in the stable channel. and removed stable-nominated Nominated for backporting to the compiler in the stable channel. labels Dec 7, 2023
@cuviper cuviper modified the milestones: 1.75.0, 1.74.1 Dec 8, 2023
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