[EXPERIMENT] Replace ResumeTy with an unsafe binder ty. by cjgillot · Pull Request #146562 · rust-lang/rust

cjgillot · 2025-09-14T23:37:53Z

This actually is one of use cases unsafe binder types are meant to address. This PR tries to use them as so.

The implementation of unsafe binders is still incomplete, so this PR is mostly for experimentation and not meant to be merged.

r? @compiler-errors

rustbot · 2025-09-14T23:37:55Z

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

rustbot · 2025-09-14T23:37:57Z

compiler-errors is not on the review rotation at the moment.
They may take a while to respond.

compiler-errors · 2025-09-15T03:32:06Z

Maybe let's crater this?

@bors try

[EXPERIMENT] Replace ResumeTy with an unsafe binder ty.

rust-bors · 2025-09-15T09:35:49Z

💥 Test timed out after 21600s

oli-obk · 2025-09-15T09:37:13Z

@bors try

[EXPERIMENT] Replace ResumeTy with an unsafe binder ty.

rust-bors · 2025-09-15T11:46:28Z

☀️ Try build successful (CI)
Build commit: 342ed2e (342ed2e8608ee307743c341962b427652cdb06e9, parent: d1ed52b1f5b78bf66127b670af813b84d57aeedb)

oli-obk · 2025-09-15T12:09:06Z

@craterbot check

craterbot · 2025-09-15T12:09:32Z

👌 Experiment pr-146562 created and queued.
🤖 Automatically detected try build 342ed2e
🔍 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 · 2025-09-15T17:57:46Z

🚧 Experiment pr-146562 is now running

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

craterbot · 2025-09-17T08:06:51Z

🎉 Experiment pr-146562 is completed!
📊 2 regressed and 7 fixed (699587 total)
📊 1491 spurious results on the retry-regessed-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-146562/retry-regressed-list.txt ↩

bors · 2025-09-17T12:08:49Z

☔ The latest upstream changes (presumably #146666) made this pull request unmergeable. Please resolve the merge conflicts.

cjgillot · 2025-09-20T21:26:14Z

@craterbot check crates=https://crater-reports.s3.amazonaws.com/pr-146562/retry-regressed-list.txt

craterbot · 2025-09-20T21:26:23Z

👌 Experiment pr-146562-1 created and queued.
🤖 Automatically detected try build 342ed2e
🔍 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 · 2025-09-21T07:24:19Z

🚧 Experiment pr-146562-1 is now running

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

craterbot · 2025-09-21T16:08:42Z

🎉 Experiment pr-146562-1 is completed!
📊 0 regressed and 0 fixed (1471 total)
📊 108 spurious results on the retry-regessed-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-146562-1/retry-regressed-list.txt ↩

rust-log-analyzer · 2026-05-09T20:50:07Z

The job aarch64-gnu-llvm-21-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

##[endgroup]
Executing "/scripts/stage_2_test_set1.sh"
+ /scripts/stage_2_test_set1.sh
+ '[' 1 == 1 ']'
+ echo 'PR_CI_JOB set; skipping tidy'
+ SKIP_TIDY='--skip tidy'
+ ../x.py --stage 2 test --skip tidy --skip compiler --skip src
PR_CI_JOB set; skipping tidy
##[group]Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.04s
##[endgroup]
---
---- [ui] tests/ui/rustc_public-ir-print/async-closure.rs stdout ----
Saved the actual stdout to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/rustc_public-ir-print/async-closure/async-closure.stdout`
diff of stdout:

40     let  _3: i32;
41     let mut _4: &i32;
42     let mut _5: ();
-     let mut _6: unsafe<'a, 'b> &'a mut Context<'b>;
-     let mut _7: u32;
-     let mut _8: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6};
-     debug _task_context => _6;
-     debug y => (*((*_8).0: &i32));
+     let mut _6: u32;
+     let mut _7: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6};
+     let mut _8: unsafe<'a, 'b> &'a mut Context<'b>;
+     debug _task_context => _8;
+     debug y => (*((*_7).0: &i32));
48     debug y => _3;
49     bb0: {
-         _8 = (_1.0: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6});
-         _7 = discriminant((*_8));
-         switchInt(move _7) -> [0: bb1, 1: bb2, otherwise: bb3];
+         _8 = wrap_binder!(Move(_2); Ty { id: 12, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
+         _7 = (_1.0: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6});
+         _6 = discriminant((*_7));
+         switchInt(move _6) -> [0: bb1, 1: bb2, otherwise: bb3];
53     }
54     bb1: {
-         _6 = wrap_binder!(Move(_2); Ty { id: 13, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
56         StorageLive(_3);
-         _4 = no_retag ((*_8).0: &i32);
+         _4 = no_retag ((*_7).0: &i32);
58         _3 = (*_4);
59         _5 = ();
60         StorageDead(_3);

61         _0 = Poll::Ready(move _5);
-         discriminant((*_8)) = 1;
+         discriminant((*_7)) = 1;
63         return;
64     }
65     bb2: {

74     let  _3: i32;
75     let mut _4: &i32;
76     let mut _5: ();
-     let mut _6: unsafe<'a, 'b> &'a mut Context<'b>;
-     let mut _7: u32;
-     let mut _8: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6};
-     debug _task_context => _6;
-     debug y => (*((*_8).0: &i32));
+     let mut _6: u32;
+     let mut _7: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6};
+     let mut _8: unsafe<'a, 'b> &'a mut Context<'b>;
+     debug _task_context => _8;
+     debug y => (*((*_7).0: &i32));
82     debug y => _3;
83     bb0: {
-         _8 = (_1.0: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6});
-         _7 = discriminant((*_8));
-         switchInt(move _7) -> [0: bb1, 1: bb2, otherwise: bb3];
+         _8 = wrap_binder!(Move(_2); Ty { id: 12, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
+         _7 = (_1.0: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6});
+         _6 = discriminant((*_7));
+         switchInt(move _6) -> [0: bb1, 1: bb2, otherwise: bb3];
87     }
88     bb1: {
-         _6 = wrap_binder!(Move(_2); Ty { id: 13, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
90         StorageLive(_3);
-         _4 = no_retag ((*_8).0: &i32);
+         _4 = no_retag ((*_7).0: &i32);
92         _3 = (*_4);
93         _5 = ();
94         StorageDead(_3);

95         _0 = Poll::Ready(move _5);
-         discriminant((*_8)) = 1;
+         discriminant((*_7)) = 1;
97         return;
98     }
99     bb2: {

Note: some mismatched output was normalized before being compared
-     let mut _7: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6};
-         _7 = (_1.0: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6});
-     let mut _7: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6};
-         _7 = (_1.0: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6});
+     let mut _6: u32;
+     let mut _7: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6};
+     let mut _8: unsafe<'a, 'b> &'a mut Context<'b>;
+     debug _task_context => _8;
+     debug y => (*((*_7).0: &i32));
+         _8 = wrap_binder!(Move(_2); Ty { id: 12, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
+         _7 = (_1.0: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6});
+         _6 = discriminant((*_7));
+         switchInt(move _6) -> [0: bb1, 1: bb2, otherwise: bb3];
+         _4 = no_retag ((*_7).0: &i32);
+         discriminant((*_7)) = 1;
+     let mut _6: u32;
+     let mut _7: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6};
+     let mut _8: unsafe<'a, 'b> &'a mut Context<'b>;
+     debug _task_context => _8;
+     debug y => (*((*_7).0: &i32));
+         _8 = wrap_binder!(Move(_2); Ty { id: 12, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
+         _7 = (_1.0: &mut {async closure body@$DIR/async-closure.rs:9:22: 11:6});
+         _6 = discriminant((*_7));
+         switchInt(move _6) -> [0: bb1, 1: bb2, otherwise: bb3];
+         _4 = no_retag ((*_7).0: &i32);
+         discriminant((*_7)) = 1;


The actual stdout differed from the expected stdout
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args rustc_public-ir-print/async-closure.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/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/rustc_public-ir-print/async-closure.rs" "-Zthreads=1" "-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/aarch64-unknown-linux-gnu/stage2" "--target=aarch64-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" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/rustc_public-ir-print/async-closure" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "incomplete_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2024" "-Z" "unpretty=stable-mir" "--crate-type" "lib" "-C" "panic=abort" "-Zmir-opt-level=0"
--- stdout -------------------------------
// WARNING: This is highly experimental output it's intended for rustc_public developers only.
// If you find a bug or want to improve the output open a issue at https://github.com/rust-lang/project-stable-mir.
fn foo() -> () {
    let mut _0: ();
    let  _1: i32;
    let  _2: {async closure@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:13: 9:21};
    let mut _3: &i32;
    debug y => _1;
    debug x => _2;
    bb0: {
        StorageLive(_1);
        _1 = 0_i32;
        StorageLive(_2);
        StorageLive(_3);
        _3 = &_1;
        _2 = {coroutine-closure@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:13: 9:21}(move _3);
        StorageDead(_3);
        _0 = ();
        StorageDead(_2);
        StorageDead(_1);
        return;
    }
}
fn foo::{closure#0}(_1: &{async closure@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:13: 9:21}) -> {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6} {
    let mut _0: {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6};
    let mut _2: &i32;
    let mut _3: &i32;
    debug y => (*((*_1).0: &i32));
    bb0: {
        StorageLive(_2);
        _3 = no_retag ((*_1).0: &i32);
        _2 = &(*_3);
        _0 = {coroutine@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6}(move _2);
        StorageDead(_2);
        return;
    }
}
fn foo::{closure#0}::{closure#0}(_1: Pin<&mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6}>, _2: &mut Context<'_>) -> Poll<()> {
    let mut _0: Poll<()>;
    let  _3: i32;
    let mut _4: &i32;
    let mut _5: ();
    let mut _6: u32;
    let mut _7: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6};
    let mut _8: unsafe<'a, 'b> &'a mut Context<'b>;
    debug _task_context => _8;
    debug y => (*((*_7).0: &i32));
    debug y => _3;
    bb0: {
        _8 = wrap_binder!(Move(_2); Ty { id: 12, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
        _7 = (_1.0: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6});
        _6 = discriminant((*_7));
        switchInt(move _6) -> [0: bb1, 1: bb2, otherwise: bb3];
    }
    bb1: {
        StorageLive(_3);
        _4 = no_retag ((*_7).0: &i32);
        _3 = (*_4);
        _5 = ();
        StorageDead(_3);
        _0 = Poll::Ready(move _5);
        discriminant((*_7)) = 1;
        return;
    }
    bb2: {
        assert(false, `async fn` resumed after completion) -> [success: bb2, unwind unreachable];
    }
    bb3: {
        unreachable;
    }
}
fn foo::{closure#0}::{synthetic#0}(_1: Pin<&mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6}>, _2: &mut Context<'_>) -> Poll<()> {
    let mut _0: Poll<()>;
    let  _3: i32;
    let mut _4: &i32;
    let mut _5: ();
    let mut _6: u32;
    let mut _7: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6};
    let mut _8: unsafe<'a, 'b> &'a mut Context<'b>;
    debug _task_context => _8;
    debug y => (*((*_7).0: &i32));
    debug y => _3;
    bb0: {
        _8 = wrap_binder!(Move(_2); Ty { id: 12, kind: RigidTy(UnsafeBinder(Binder { value: Ty { id: 19, kind: RigidTy(Ref(Region { kind: ReBound(0, BoundRegion { var: 0, kind: BrAnon }) }, Ty { id: 20, kind: RigidTy(Adt(AdtDef(DefId { id: 5, name: "std::task::Context" }), GenericArgs([Lifetime(Region { kind: ReBound(0, BoundRegion { var: 1, kind: BrAnon }) })]))) }, Mut)) }, bound_vars: [Region(BrAnon), Region(BrAnon)] })) });
        _7 = (_1.0: &mut {async closure body@/checkout/tests/ui/rustc_public-ir-print/async-closure.rs:9:22: 11:6});
        _6 = discriminant((*_7));
        switchInt(move _6) -> [0: bb1, 1: bb2, otherwise: bb3];
    }
    bb1: {
        StorageLive(_3);
        _4 = no_retag ((*_7).0: &i32);
        _3 = (*_4);
        _5 = ();
        StorageDead(_3);
        _0 = Poll::Ready(move _5);
        discriminant((*_7)) = 1;
        return;
    }
    bb2: {
        assert(false, `async fn` resumed after completion) -> [success: bb2, unwind unreachable];
    }
    bb3: {
        unreachable;
    }
}

rustbot assigned compiler-errors Sep 14, 2025

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rust-bors Bot added a commit that referenced this pull request Sep 15, 2025

Auto merge of #146562 - cjgillot:resume-ty, r=<try>

4fd2dde

[EXPERIMENT] Replace ResumeTy with an unsafe binder ty.

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rust-bors Bot added a commit that referenced this pull request Sep 15, 2025

Auto merge of #146562 - cjgillot:resume-ty, r=<try>

342ed2e

[EXPERIMENT] Replace ResumeTy with an unsafe binder ty.

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 Sep 15, 2025

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 Sep 17, 2025

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 Sep 20, 2025

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cjgillot marked this pull request as draft October 16, 2025 16:44

rustbot 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 Oct 16, 2025

cjgillot force-pushed the resume-ty branch 2 times, most recently from f714d7b to 1420629 Compare May 8, 2026 21:58

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oli-obk assigned oli-obk and unassigned compiler-errors May 9, 2026

cjgillot added 4 commits May 9, 2026 18:17

Call deref_finder when building bodies instead of after it.

7f57cb7

Support unsafe binders in rustc_public.

068f0f9

Recursively validate unsafe binders.

19c5448

Support unsafe binders in borrowck.

29f7290

cjgillot mentioned this pull request May 9, 2026

Support unsafe binders in borrowck, stable MIR and const-eval #156373

Draft

Merge branch 'unsafer-binder'

930d4fb

cjgillot force-pushed the resume-ty branch from 619b8e2 to 6b4c85d Compare May 9, 2026 20:11

Replace ResumeTy with an unsafe binder ty.

2f0774d

cjgillot force-pushed the resume-ty branch from 6b4c85d to 2f0774d Compare May 9, 2026 20:11

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