[CRATER] Require equality for symmetric LUB coercion

[jackh726]

Ensures that these both error:

struct Wrap3<T: ?Sized>(T);

impl<'b, T: ?Sized + std::marker::Unsize<U> + std::ops::CoerceUnsized<U>, U: ?Sized>
    std::ops::CoerceUnsized<Wrap3<U>> for Wrap3<T> {}

type I = Wrap3<Inner>;
type J = Wrap3<dyn Dynable + Send>;
type K = Wrap3<dyn Dynable>;

// LUB is `J` on nightly
match 0 {
    0 => &Wrap3(Inner)      as &I,
    1 => &Wrap3(Inner)      as &J,
    2 => &Wrap3(Inner)      as &K,
    _ => loop {},
}

// LUB is `K` on nightly
match 0 {
    0 => &Wrap3(Inner)      as &I,
    1 => &Wrap3(Inner)      as &K,
    2 => &Wrap3(Inner)      as &J,
    _ => loop {},
}

r? ghost

[jackh726]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: bac5816 (bac5816c5f3d02cebd0599070af62d1782530294, parent: 82dd3cb008233bfe50ba6b8d6618e6bbd6054eb1)

[rust-timer]

Finished benchmarking commit (bac5816): comparison URL.

Overall result: ❌ regressions - please read the text below

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

Next Steps: If you can justify the regressions found in this try perf run, please do so in sufficient writing along with @rustbot label: +perf-regression-triaged. If not, please fix the regressions and do another perf run. If its results are neutral or positive, the label will be automatically removed.

@bors rollup=never
@rustbot label: -S-waiting-on-perf +perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	0.4%	[0.1%, 0.9%]	22
Regressions ❌ (secondary)	3.8%	[0.1%, 9.6%]	31
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.4%	[0.1%, 0.9%]	22

Max RSS (memory usage)

Results (primary 0.8%, secondary 1.5%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	3.7%	[1.3%, 9.1%]	4
Regressions ❌ (secondary)	2.2%	[1.1%, 2.8%]	3
Improvements ✅ (primary)	-5.1%	[-5.4%, -4.8%]	2
Improvements ✅ (secondary)	-0.7%	[-0.7%, -0.7%]	1
All ❌✅ (primary)	0.8%	[-5.4%, 9.1%]	6

Cycles

Results (primary -2.8%, secondary 5.9%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	5.9%	[4.4%, 7.7%]	8
Improvements ✅ (primary)	-2.8%	[-3.8%, -1.4%]	12
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.8%	[-3.8%, -1.4%]	12

Binary size

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

Bootstrap: 492.292s -> 484.36s (-1.61%)
Artifact size: 392.38 MiB -> 392.44 MiB (0.02%)

[jackh726]

@craterbot check

[craterbot]

👌 Experiment pr-150408 created and queued.
🤖 Automatically detected try build bac5816
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[craterbot]

🚧 Experiment pr-150408 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[craterbot]

🎉 Experiment pr-150408 is completed!
📊 519 regressed and 4 fixed (768548 total)
📊 2039 spurious results on the retry-regressed-list.txt, consider a retry¹ if this is a significant amount.
📰 Open the summary report.

⚠️ If you notice any spurious failure please add them to the denylist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

Footnotes

1. re-run the experiment with crates=https://crater-reports.s3.amazonaws.com/pr-150408/retry-regressed-list.txt ↩

[jackh726]

@bors try

[rust-bors]

☀️ Try build successful (CI)
Build commit: 9bb5641 (9bb5641bfa3e7e0c9ede079ad0a1d43b1b7422bc, parent: f57eac1bf98cb5d578e3364b64365ec398c137df)

[jackh726]

@craterbot run name=require-direct mode=check-only start=master#f57eac1bf98cb5d578e3364b64365ec398c137df end=try#9bb5641bfa3e7e0c9ede079ad0a1d43b1b7422bc crates=https://crater-reports.s3.amazonaws.com/pr-150408/retry-regressed-list.txt

[craterbot]

👌 Experiment require-direct created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[rust-bors]

💔 Test for 1eba9e2 failed: CI. Failed job:

• try - dist-x86_64-linux (web logs, enhanced plaintext logs)

[jackh726]

@bors retry

[rust-bors]

❗ You can only retry pull requests that are approved and have a previously failed auto build.

[jackh726]

@bors try

[rust-bors]

💔 Test for 8a19fe1 failed: CI. Failed job:

• try - dist-x86_64-linux (web logs, enhanced plaintext logs)

[jackh726]

@bors try

[rust-log-analyzer]

The job tidy failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Diff in /checkout/compiler/rustc_hir_typeck/src/coercion_guidance.rs:46:
 };
 use rustc_infer::traits::{Obligation, PredicateObligation, PredicateObligations, SelectionError};
 use rustc_middle::ty::adjustment::{
-    Adjust, Adjustment, AllowTwoPhase, AutoBorrow, AutoBorrowMutability, DerefAdjustKind, PointerCoercion,
+    Adjust, Adjustment, AllowTwoPhase, AutoBorrow, AutoBorrowMutability, DerefAdjustKind,
+    PointerCoercion,
 };
 use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::relate::{self, Relate, TypeRelation};
fmt: checked 6702 files
Bootstrap failed while executing `test src/tools/tidy tidyselftest --extra-checks=py,cpp,js,spellcheck`

[rust-bors]

☀️ Try build successful (CI)
Build commit: 2f436d5 (2f436d5822164c7dc46729ecf9f1f8faa09fe9e4, parent: 1210e9fa3ee9c9712fa694f90f7a032f2f0fd786)

[jackh726]

@craterbot run name=feb-17 mode=check-only start=master#1210e9fa3ee9c9712fa694f90f7a032f2f0fd786 end=try#2f436d5822164c7dc46729ecf9f1f8faa09fe9e4 crates=https://crater-reports.s3.amazonaws.com/pr-150408/retry-regressed-list.txt

[craterbot]

👌 Experiment feb-17 created and queued.
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more