Enable polonius alpha on nightly by jackh726 · Pull Request #159343 · rust-lang/rust

jackh726 · 2026-07-15T16:01:09Z

The first commit here adds an -Zpolonius=nll argument for tests and so people can disable alpha on nightly.

jackh726 · 2026-07-15T16:01:32Z

Enable polonius alpha on nightly

rust-bors · 2026-07-15T18:10:24Z

☀️ Try build successful (CI)
Build commit: 24e1a22 (24e1a22664233bce1f9b5dc6eee7c1f74327e28c)
Base parent: df1ae0f (df1ae0f7dd168513de2d89beb2cb7a95d4fdc118)

jackh726 · 2026-07-15T18:51:07Z

@craterbot check p=1

(priority bump b/c we want to get this enabled for testing)

craterbot · 2026-07-15T18:51:37Z

👌 Experiment pr-159343 created and queued.
🤖 Automatically detected try build 24e1a22
🔍 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-timer · 2026-07-15T18:58:30Z

Finished benchmarking commit (24e1a22): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never rustc-perf
@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)	3.0%	[0.3%, 15.3%]	88
Regressions ❌ (secondary)	2.1%	[0.2%, 15.1%]	102
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-1.1%	[-1.2%, -1.0%]	6
All ❌✅ (primary)	3.0%	[0.3%, 15.3%]	88

Max RSS (memory usage)

Results (primary 4.2%, secondary 3.2%)

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

	mean	range	count
Regressions ❌ (primary)	4.2%	[2.1%, 7.7%]	6
Regressions ❌ (secondary)	6.2%	[2.0%, 11.7%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.3%	[-6.2%, -2.4%]	2
All ❌✅ (primary)	4.2%	[2.1%, 7.7%]	6

Cycles

Results (primary 4.2%, secondary 4.6%)

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

	mean	range	count
Regressions ❌ (primary)	4.2%	[1.8%, 8.4%]	25
Regressions ❌ (secondary)	4.6%	[2.1%, 7.1%]	21
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	4.2%	[1.8%, 8.4%]	25

Binary size

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

Bootstrap: 487.651s -> 492.438s (0.98%)
Artifact size: 389.37 MiB -> 389.64 MiB (0.07%)

Kobzol · 2026-07-16T08:01:16Z

The way we enabled nightly-only for LLD was through a build configuration in bootstrap, I think that's a more explicit way, and will be easier to revert/modify on beta/stable, than to have that code in the compiler. If we did it like this PR does currently, then Polonius would be used by default if you use RUSTC_BOOTSTRAP=1 on stable, which is not ideal, I think. I'm pretty sure we set that flag kinda randomly all over bootstrap even on stable/beta toolchains, that would produce a lot of confusion.

If we did it through bootstrap, then there would be an env variable or a cfg that would be set by bootstrap at rustc build time, which would select the default mode and hardcode it when we build rustc.

jackh726 · 2026-07-16T19:04:44Z

@lqd said something similar to me. I'll take stab at it. As to whether RUSTC_BOOTSTRAP=1 should enable this, idk. Probably not,

craterbot · 2026-07-17T09:56:14Z

🚧 Experiment pr-159343 is now running

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

craterbot · 2026-07-19T21:08:51Z

🎉 Experiment pr-159343 is completed!
📊 2 regressed and 18 fixed (1026208 total)
📊 5682 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-159343/retry-regressed-list.txt ↩

jackh726 · 2026-07-21T14:10:35Z

@craterbot check p=2 crates=https://crater-reports.s3.amazonaws.com/pr-159343/retry-regressed-list.txt name=pr-159343-retry

Let's recheck this to see how we're doing. Wondering if these are performance-related.

craterbot · 2026-07-21T14:10:45Z

👌 Experiment pr-159343-retry created and queued.
🤖 Automatically detected try build 24e1a22
🔍 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 · 2026-07-22T16:27:59Z

🚧 Experiment pr-159343-retry is now running

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

craterbot · 2026-07-22T23:33:14Z

🎉 Experiment pr-159343-retry is completed!
📊 0 regressed and 0 fixed (5632 total)
📊 773 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-159343-retry/retry-regressed-list.txt ↩

Kobzol

Bootstrap change looks good to me. Very excited by this!!

View changes since this review

lqd · 2026-08-03T09:25:20Z

Two things:

ideally we want some consistency with the next-solver opt-outs. It disables itself via -Znext-solver=no, which is the usual way we do this AFAICT. Let's do that as well IMHO, off/no/etc.
this stops testing NLLs on CI (apart from the handful of tests that opt in to that), and we're still testing the compare-mode in the next-solver-polonius job. I believe we still want to test NLLs in case there are diagnostics or changes wherever, because it's what's on stable and can also cause discrepancies that will only be seen in the beta crater runs. t-release and crater triaging should also be aware that this default is different between stable/beta and nightly.

rust-log-analyzer · 2026-08-04T00:40:39Z

The job x86_64-gnu-gcc failed! Check out the build log: (web) (plain enhanced) (plain)

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

To only update this specific test, also pass `--test-args linkage-attr/unreferenced-used-static-issue-127052.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/linkage-attr/unreferenced-used-static-issue-127052.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/linkage-attr/unreferenced-used-static-issue-127052" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

---
To only update this specific test, also pass `--test-args proc-macro/crt-static.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/proc-macro/crt-static.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/proc-macro/crt-static" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "--crate-type" "proc-macro" "-Ctarget-feature="
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

---
To only update this specific test, also pass `--test-args proc-macro/no-mangle-in-proc-macro-issue-111888.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/proc-macro/no-mangle-in-proc-macro-issue-111888.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/proc-macro/no-mangle-in-proc-macro-issue-111888" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers" "-L" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/proc-macro/no-mangle-in-proc-macro-issue-111888/auxiliary"
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

---
To only update this specific test, also pass `--test-args proc-macro/no-missing-docs.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/proc-macro/no-missing-docs.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/proc-macro/no-missing-docs" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

---
To only update this specific test, also pass `--test-args runtime/stdout-before-main.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/runtime/stdout-before-main.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/runtime/stdout-before-main/a" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

---
To only update this specific test, also pass `--test-args rust-2018/proc-macro-crate-in-paths.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/rust-2018/proc-macro-crate-in-paths.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/rust-2018/proc-macro-crate-in-paths" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

---
To only update this specific test, also pass `--test-args traits/dyn-drop-principal.rs`

error: 1 errors occurred comparing output.
status: exit status: 0
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/traits/dyn-drop-principal.rs" "-Zsimulate-remapped-rust-src-base=/rustc/FAKE_PREFIX" "-Ztranslate-remapped-path-to-local-path=no" "-Z" "ignore-directory-in-diagnostics-source-blocks=/cargo" "-Z" "ignore-directory-in-diagnostics-source-blocks=/checkout/vendor" "--sysroot" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage2" "-Zcodegen-backend=gcc" "--target=x86_64-unknown-linux-gnu" "--check-cfg" "cfg(test,FALSE)" "-O" "--error-format" "json" "--json" "future-incompat" "-Ccodegen-units=1" "-Zui-testing" "-Zdeduplicate-diagnostics=no" "-Zwrite-long-types-to-disk=no" "-Cstrip=debuginfo" "-C" "prefer-dynamic" "-o" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/traits/dyn-drop-principal/a" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/x86_64-unknown-linux-gnu/native/rust-test-helpers"
stdout: none
--- stderr -------------------------------
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
libgccjit.so: warning: : ‘retain’ attribute ignored [-Wattributes]
------------------------------------------

Important

For more information how to resolve CI failures of this job, visit this link.

theemathas · 2026-08-04T01:17:54Z

Do we need a blog post before this is merged?

jackh726 · 2026-08-04T02:37:14Z

See rust-lang/blog.rust-lang.org#1900

lqd · 2026-08-04T08:57:35Z

this stops testing NLLs on CI (apart from the handful of tests that opt in to that)

I'll try to find time to take care of the above.

r=me+jakub after rust-lang/blog.rust-lang.org#1900 lands

lqd · 2026-08-04T09:01:13Z

@@ -892,7 +894,8 @@ mod desc {
        components: `crto`, `libc`, `unwind`, `linker`, `sanitizers`, `mingw`";
    pub(crate) const parse_linker_features: &str =
        "a list of enabled (`+` prefix) and disabled (`-` prefix) features: `lld`";
-    pub(crate) const parse_polonius: &str = "either no value or `legacy` (the default), or `next`";
+    pub(crate) const parse_polonius: &str =
+        "either no value or one of `legacy` (the default), `off`, or `next`";


(we may want to clarify this, it's the "default" if you don't provide a = value when providing the flag, but not a default option value of course)

View changes since the review

jackh726 · 2026-08-04T14:39:46Z

@bors r=lqd,Kobzol

rust-bors · 2026-08-04T14:39:49Z

📌 Commit a9836a4 has been approved by lqd,Kobzol

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 10. This pull request will be tested once the tree is reopened.

Reason for tree closure: manually handling queue due to backlog

Kobzol · 2026-08-04T14:44:22Z

@bors try @rust-timer queue

Just to check whether it still works in the distributed artifacts.

Enable polonius alpha on nightly

rust-bors · 2026-08-04T15:55:47Z

☀️ Try build successful (CI)
Build commit: ecff631 (ecff6313d19dd905dc26e81329ba40146f26ed22)
Base parent: 0b63def (0b63defc8fd68957c635fe61f097b84df8fd9611)

rust-timer · 2026-08-04T16:41:19Z

Finished benchmarking commit (ecff631): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

@bors rollup=never rustc-perf
@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)	2.9%	[0.2%, 15.5%]	94
Regressions ❌ (secondary)	2.1%	[0.2%, 15.5%]	104
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.8%	[-1.2%, -0.1%]	10
All ❌✅ (primary)	2.9%	[0.2%, 15.5%]	94

Max RSS (memory usage)

Results (primary 3.5%, secondary 1.6%)

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

	mean	range	count
Regressions ❌ (primary)	3.5%	[0.4%, 9.3%]	11
Regressions ❌ (secondary)	6.3%	[0.4%, 11.2%]	4
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.1%	[-6.9%, -0.8%]	4
All ❌✅ (primary)	3.5%	[0.4%, 9.3%]	11

Cycles

Results (primary 3.2%, secondary 2.7%)

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

	mean	range	count
Regressions ❌ (primary)	3.5%	[0.4%, 9.2%]	37
Regressions ❌ (secondary)	3.6%	[0.5%, 7.4%]	29
Improvements ✅ (primary)	-0.8%	[-1.0%, -0.5%]	3
Improvements ✅ (secondary)	-2.5%	[-7.2%, -0.6%]	5
All ❌✅ (primary)	3.2%	[-1.0%, 9.2%]	40

Binary size

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

Bootstrap: 489.577s -> 493.82s (0.87%)
Artifact size: 390.24 MiB -> 390.10 MiB (-0.04%)

Kobzol · 2026-08-05T14:50:02Z

@bors p=1 Bump because it has been announced

Bumping this slightly, because the blog post about Polonius being enabled on default already went out.

rust-bors · 2026-08-05T18:18:55Z

⌛ Testing commit a9836a4 with merge 7608eb7...

Workflow: https://github.com/rust-lang/rust/actions/runs/31034143130

Enable polonius alpha on nightly See [rust-lang/compiler-team#](rust-lang/compiler-team#1015) The first commit here adds an `-Zpolonius=nll` argument for tests and so people can disable alpha on nightly.

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 Jul 15, 2026

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rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Jul 15, 2026

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rust-bors Bot pushed a commit that referenced this pull request Jul 15, 2026

Auto merge of #159343 - jackh726:enable-polonius-alpha, r=<try>

24e1a22

Enable polonius alpha on nightly

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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. S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Jul 15, 2026

rustbot added the perf-regression Performance regression. label Jul 15, 2026

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 Jul 19, 2026

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 Jul 21, 2026

rust-cloud-vms Bot force-pushed the enable-polonius-alpha branch from 0006999 to 3379bb5 Compare July 21, 2026 18:12

rust-cloud-vms Bot force-pushed the enable-polonius-alpha branch from 3379bb5 to f7d91a7 Compare July 22, 2026 18:07

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jackh726 mentioned this pull request Aug 3, 2026

Tracking Issue: Polonius Alpha on nightly #160456

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jackh726 added 2 commits August 3, 2026 23:26

Add -Zpolonius=off option and use it in tests.

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Enable polonius alpha on nightly

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rust-cloud-vms Bot force-pushed the enable-polonius-alpha branch from 4a43ea2 to a9836a4 Compare August 3, 2026 23:27

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rust-bors Bot pushed a commit that referenced this pull request Aug 4, 2026

Auto merge of #159343 - jackh726:enable-polonius-alpha, r=<try>

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Enable polonius alpha on nightly

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Aug 4, 2026

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lqd mentioned this pull request Aug 5, 2026

add a test showing polonius alpha is not a subset of datalog polonius #160588

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rust-timer commented Jul 15, 2026

Overall result: ❌✅ regressions and improvements - please read:

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Overall result: ❌✅ regressions and improvements - please read:

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