Treat generics in trait and projection bounds as live always by jackh726 · Pull Request #161154 · rust-lang/rust

jackh726 · 2026-08-16T03:01:38Z

(for crater run)

jackh726 · 2026-08-16T03:02:11Z

Treat generics in trait and projection bounds as live always

rust-bors · 2026-08-16T04:00:33Z

☀️ Try build successful (CI)
Build commit: 49a6044 (49a6044d37d694890450f52ceaceb66277a36b1e)
Base parent: 67854e5 (67854e511de21d881bb16426996cd4259d44aa2e)

rust-timer · 2026-08-16T04:42:48Z

Finished benchmarking commit (49a6044): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

This perf run didn't have relevant results for this metric.

Max RSS (memory usage)

Results (secondary -0.6%)

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)	1.0%	[1.0%, 1.0%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.1%	[-2.1%, -2.1%]	1
All ❌✅ (primary)	-	-	0

Cycles

Results (secondary 2.0%)

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%	[2.0%, 9.9%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.0%	[-4.8%, -2.1%]	4
All ❌✅ (primary)	-	-	0

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 459.382s -> 459.414s (0.01%)
Artifact size: 396.87 MiB -> 398.81 MiB (0.49%)

jackh726 · 2026-08-16T05:02:43Z

@craterbot check

craterbot · 2026-08-16T05:03:17Z

👌 Experiment pr-161154 created and queued.
🤖 Automatically detected try build 49a6044
🔍 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

jackh726 · 2026-08-17T02:45:42Z

@craterbot p=1

Polonius Alpha is already enabled on nightly - it would be good to be prompt in figuring out if we can make this change to close some soundness holes.

craterbot · 2026-08-17T02:45:46Z

📝 Configuration of the pr-161154 experiment changed.

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

theemathas · 2026-08-25T04:53:47Z

This seems more urgent than the --release run of the beta crater.

@craterbot p=4

craterbot · 2026-08-25T04:53:51Z

📝 Configuration of the pr-161154 experiment changed.

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

craterbot · 2026-08-25T20:13:46Z

🚧 Experiment pr-161154 is now running

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

craterbot · 2026-08-28T10:50:02Z

🎉 Experiment pr-161154 is completed!
📊 98 regressed and 2 fixed (1080274 total)
📊 6304 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

re-run the experiment with crates=https://crater-reports.s3.amazonaws.com/pr-161154/retry-regressed-list.txt ↩

jackh726 · 2026-10-27T11:42:37Z

@bors try

Treat generics in trait and projection bounds as live always

rust-bors · 2026-10-27T12:41:05Z

☀️ Try build successful (CI)
Build commit: 6d99ee3 (6d99ee30d95360fa108a71e3985c92ca3f0fd6dc)
Base parent: 16d1ffa (16d1ffac17ad8b739e32483ac2e65fe7e1804977)

jackh726 · 2026-10-27T13:23:17Z

@craterbot check p=5 crates=https://crater-reports.s3.amazonaws.com/pr-161154/retry-regressed-list.txt

craterbot · 2026-10-27T13:23:41Z

👌 Experiment pr-161154-1 created and queued.
🤖 Automatically detected try build 6d99ee3
🔍 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 · 2026-10-28T14:04:38Z

🚧 Experiment pr-161154-1 is now running

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

craterbot · 2026-10-28T23:20:24Z

🎉 Experiment pr-161154-1 is completed!
📊 30 regressed and 0 fixed (6150 total)
📊 430 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

re-run the experiment with crates=https://crater-reports.s3.amazonaws.com/pr-161154-1/retry-regressed-list.txt ↩

rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Aug 16, 2026

jackh726 changed the title ~~Treat generics in trait and projection bounds as live always @jackh726~~ Treat generics in trait and projection bounds as live always Aug 16, 2026

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rust-bors Bot pushed a commit that referenced this pull request Aug 16, 2026

Auto merge of #161154 - jackh726:opaque-liveness-v2, r=<try>

49a6044

Treat generics in trait and projection bounds as live always

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 16, 2026

craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Aug 16, 2026

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craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Aug 28, 2026

jackh726 added 5 commits October 13, 2026 07:53

Add tests for unsoundness involving alias liveness

da61e9c

More tests for alias liveness

ce0828d

Always treat type args as live

c23aa68

Make the outlives lifetimes themselves always live

63e7042

Recurse liveness into the bounds of alias args

2828b7c

rust-cloud-vms Bot force-pushed the opaque-liveness-v2 branch from b97b2a3 to 2828b7c Compare October 27, 2026 11:39

rust-bors Bot pushed a commit that referenced this pull request Oct 27, 2026

Auto merge of #161154 - jackh726:opaque-liveness-v2, r=<try>

6d99ee3

Treat generics in trait and projection bounds as live always

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craterbot added S-waiting-on-crater Status: Waiting on a crater run to be completed. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Oct 27, 2026

Be more precise about liveness cycle handling.

c690f2f

craterbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-crater Status: Waiting on a crater run to be completed. labels Oct 28, 2026

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rust-timer commented Aug 16, 2026

Overall result: no relevant changes - no action needed

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Binary size

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jackh726 commented Aug 16, 2026 •

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