Rollup of 23 pull requests by JonathanBrouwer · Pull Request #165756 · rust-lang/rust

JonathanBrouwer · 2026-11-10T13:48:40Z

Successful merges:

Prepare to make rustc_trivial_field_reads usable in user code #164217 (Prepare to make rustc_trivial_field_reads usable in user code)
Move trait feature gate #165569 (Move trait feature gate)
Upgrade bundled musl to 1.2.6 #165575 (Upgrade bundled musl to 1.2.6)
-Zassumptions-on-binders: Emit new-style region constraints from type relations #157984 (-Zassumptions-on-binders: Emit new-style region constraints from type relations)
Add enclosing item context when pointing at FnMut bound #163241 (Add enclosing item context when pointing at FnMut bound)
add core::arch::{x86, x86_64}::x87_f80 #163992 (add core::arch::{x86, x86_64}::x87_f80)
Change the span building of paths from first-to-last to chained #165047 (Change the span building of paths from first-to-last to chained)
std: use skip_unsupported_miri_tests to control when tests should be skipped in Miri due to missing shims #165117 (std: use skip_unsupported_miri_tests to control when tests should be skipped in Miri due to missing shims)
fix incorrect byte count suffix on MSVC #165458 (fix incorrect byte count suffix on MSVC)
Mark the compile unit for -Zdebuginfo-for-profiling #165490 (Mark the compile unit for -Zdebuginfo-for-profiling)
Remove backend_optimization_level. #165586 (Remove backend_optimization_level.)
fix NumScalableVectors::from_field_count #165646 (fix NumScalableVectors::from_field_count)
Unignore passing GCC backend tests #165655 (Unignore passing GCC backend tests)
Partially stabilize ptr_alignment_type as alignment_type #153261 (Partially stabilize ptr_alignment_type as alignment_type)
Windows: fix Dir::remove and Dir::rename following symlinks #164559 (Windows: fix Dir::remove and Dir::rename following symlinks)
stop using gce in a test #165562 (stop using gce in a test)
Add safety requirements for Pattern and Searcher #165681 (Add safety requirements for Pattern and Searcher)
interpret: ensure newly created unions have uninit in their padding #165682 (interpret: ensure newly created unions have uninit in their padding)
Move check_attr to attribute parsing #165693 (Move check_attr to attribute parsing)
windows: check for null before wide encoding #165715 (windows: check for null before wide encoding)
mpsc_sync::stream_send_recv_stress: wait for all threads to finish #165717 (mpsc_sync::stream_send_recv_stress: wait for all threads to finish)
docs(num): remove needless whitespaces #165733 (docs(num): remove needless whitespaces)
remove NOP File::flush from fs tests #165739 (remove NOP File::flush from fs tests)

Failed merges:

Normalize "beta release channel" in const-supertrait-unstable test #165727 (Normalize "beta release channel" in const-supertrait-unstable test)
Tweak private re-export errors to point at correct span and have more context #164218 (Tweak private re-export errors to point at correct span and have more context)
remove 'x miri' smoke test from PR CI #165709 (remove 'x miri' smoke test from PR CI)

Ensure that we always show the `fn` (and its enclosing `trait`/`impl` if appropriate) when pointing at an `FnMut` bound: ``` help: `Fn` and `FnMut` closures require captured values to be able to be consumed multiple times, but `FnOnce` closures may consume them only once --> $DIR/fnmut-closure-moving-value.rs:11:14 | LL | impl Bar { LL | fn f<F>(&self, mut f: F) LL | where F: FnMut() | ^^^^^^^ ```

Keep region equality in the unification table and transport its deferred outlives requirements through solver constraints. Record directed constraints for subtype relations under assumptions on binders.

With `-Zdebuginfo-for-profiling`, set `debugInfoForProfiling` on the `DICompileUnit`, as Clang does for `-fdebug-info-for-profiling` (`CGDebugInfo.cpp`). Before this change, the flag only added the discriminators pass, and the compile unit flag was always false.

This also includes these 3 patches for musl CVEs: - [CVE-2026-6042]: denial of service in iconv - [CVE-2026-6042]: qsort stack buffer overflow - [CVE-2026-107891]: integer overflow in regcomp The first two were already being applied to our build of musl 1.2.5, the third one is new. [CVE-2026-6042]: https://www.openwall.com/lists/musl/2026/04/03/2 [CVE-2026-40200]: https://www.openwall.com/lists/musl/2026/04/10/3 [CVE-2026-107891]: https://www.openwall.com/lists/musl/2026/10/21/1

add the trait and the trait gate

see similar fixes on the forget

Without it, reads are reported as UB because the tracking of what bytes are initialized is incorect

added a fast path in the rustdoc helper, assuming that move is implemented everywhere if the feature is off

…ts should be skipped in Miri due to missing shims

Only a `\0` byte in an OsStr becomes a WTF16 NUL, so we can check before converting instead of after. For `to_u16s`, this up to halves the amount of memory being scanned, and it can use the optimized memchr [u8] path. For `ensure_no_nuls` the same applies, and this additionally skips a duplicated WTF8->WTF16 conversion: all but one call to it is followed by `encode_wide` anyway.

Turns out that all uses were effectively equivalent to using sess.opts.optimize.

JonathanBrouwer · 2026-11-10T13:48:57Z

@bors r+ p=5 force

Trying commonly failed jobs
@bors try jobs=dist-various-1,test-various,test-x86_64-gnu-aux,test-x86_64-msvc-1,test-aarch64-apple-1,test-aarch64-apple-2,test-x86_64-mingw-1,test-i686-msvc,test-armhf-gnu,test-x86_64-gnu-llvm-22-3,test-aarch64-msvc-2,test-x86_64-msvc-ext2

rust-bors · 2026-11-10T13:49:02Z

📌 Commit 579771d has been approved by JonathanBrouwer

It is now in the queue for this repository.

Rollup of 23 pull requests try-job: dist-various-1 try-job: test-various try-job: test-x86_64-gnu-aux try-job: test-x86_64-msvc-1 try-job: test-aarch64-apple-1 try-job: test-aarch64-apple-2 try-job: test-x86_64-mingw-1 try-job: test-i686-msvc try-job: test-armhf-gnu try-job: test-x86_64-gnu-llvm-22-3 try-job: test-aarch64-msvc-2 try-job: test-x86_64-msvc-ext2

rust-bors · 2026-11-10T14:02:05Z

PR #165117, which is a member of this rollup, was unapproved.

This rollup was thus unapproved.

rust-log-analyzer · 2026-11-10T14:15:43Z

The job test-x86_64-gnu-llvm-22-3 failed! Check out the build log: (web) (plain enhanced) (plain)

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

---- [ui] tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859/principal-upcast-region-eq-issue-157859.stderr`
diff of stderr:

- error[E0277]: the trait bound `&dyn Sub: CoerceUnsized<&dyn Super<for<'a> fn(&'a ())>>` is not satisfied
+ error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<for<'a> fn(&'a ())>>` is not satisfied
2   --> $DIR/principal-upcast-region-eq-issue-157859.rs:6:49
3    |
4 LL |         let b: &dyn Super<for<'a> fn(&'a ())> = a;

5    |                                                 ^ the nightly-only, unstable trait `Unsize<dyn Super<for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
6    |
7    = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
-    = note: required for `&dyn Sub` to implement `CoerceUnsized<&dyn Super<for<'a> fn(&'a ())>>`
9    = note: required for the cast from `&dyn Sub` to `&dyn Super<for<'a> fn(&'a ())>`
10 
11 error: aborting due to 1 previous error


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" "/checkout/tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.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/stage1" "--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" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859" "-Znext-solver=coherence" "-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" "--edition=2015" "-Zassumptions-on-binders" "-Znext-solver=globally"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<for<'a> fn(&'a ())>>` is not satisfied
##[error]  --> /checkout/tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs:6:49
   |
LL |         let b: &dyn Super<for<'a> fn(&'a ())> = a;
   |                                                 ^ the nightly-only, unstable trait `Unsize<dyn Super<for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
   |
   = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
   = note: required for the cast from `&dyn Sub` to `&dyn Super<for<'a> fn(&'a ())>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------

---- [ui] tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs stdout end ----
---- [ui] tests/ui/assumptions_on_binders/trait-upcast-projection-region-eq.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/trait-upcast-projection-region-eq/trait-upcast-projection-region-eq.stderr`
diff of stderr:

- error[E0277]: the trait bound `&dyn Sub: CoerceUnsized<&dyn Super<Assoc = for<'a> fn(&'a ())>>` is not satisfied
+ error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not satisfied
2   --> $DIR/trait-upcast-projection-region-eq.rs:8:57
3    |
4 LL |         let b: &dyn Super<Assoc = for<'a> fn(&'a ())> = a;

5    |                                                         ^ the nightly-only, unstable trait `Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
6    |
7    = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
-    = note: required for `&dyn Sub` to implement `CoerceUnsized<&dyn Super<Assoc = for<'a> fn(&'a ())>>`
9    = note: required for the cast from `&dyn Sub` to `&dyn Super<Assoc = for<'a> fn(&'a ())>`
10 
11 error: aborting due to 1 previous error


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args assumptions_on_binders/trait-upcast-projection-region-eq.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
command: env -u RUSTC_LOG_COLOR RUSTC_ICE="0" RUST_BACKTRACE="short" "/checkout/obj/build/x86_64-unknown-linux-gnu/stage1/bin/rustc" "/checkout/tests/ui/assumptions_on_binders/trait-upcast-projection-region-eq.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/stage1" "--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" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/trait-upcast-projection-region-eq" "-Znext-solver=coherence" "-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" "--edition=2015" "-Zassumptions-on-binders" "-Znext-solver=globally"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not satisfied
##[error]  --> /checkout/tests/ui/assumptions_on_binders/trait-upcast-projection-region-eq.rs:8:57
   |
LL |         let b: &dyn Super<Assoc = for<'a> fn(&'a ())> = a;
   |                                                         ^ the nightly-only, unstable trait `Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
   |
   = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
   = note: required for the cast from `&dyn Sub` to `&dyn Super<Assoc = for<'a> fn(&'a ())>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------

rust-log-analyzer · 2026-11-10T14:29:51Z

The job test-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)

test [ui] tests/ui/abi/compatibility.rs#aarch64-win ... ignored, backend `gcc` cannot build for target `aarch64-pc-windows-msvc`
test [ui] tests/ui/abi/compatibility.rs#aix ... ignored, backend `gcc` cannot build for target `powerpc64-ibm-aix`
test [ui] tests/ui/abi/compatibility.rs#arm ... ignored, backend `gcc` cannot build for target `arm-unknown-linux-gnueabi`
test [ui] tests/ui/abi/compatibility.rs#bpf ... ignored, backend `gcc` cannot build for target `bpfeb-unknown-none`
test [ui] tests/ui/abi/compatibility.rs#csky ... ignored, backend `gcc` cannot build for target `csky-unknown-linux-gnuabiv2`
test [ui] tests/ui/abi/cabi-int-widening.rs ... ok
test [ui] tests/ui/abi/compatibility.rs#i686 ... ignored, backend `gcc` cannot build for target `i686-unknown-linux-gnu`
test [ui] tests/ui/abi/compatibility.rs#i686-reg-struct-return ... ignored, backend `gcc` cannot build for target `i686-unknown-linux-gnu`
test [ui] tests/ui/abi/compatibility.rs#i686-win ... ignored, backend `gcc` cannot build for target `i686-pc-windows-msvc`
test [ui] tests/ui/abi/compatibility.rs#i686-win-gnu ... ignored, backend `gcc` cannot build for target `i686-pc-windows-gnu`
---
---- [ui] tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859/principal-upcast-region-eq-issue-157859.stderr`
diff of stderr:

- error[E0277]: the trait bound `&dyn Sub: CoerceUnsized<&dyn Super<for<'a> fn(&'a ())>>` is not satisfied
+ error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<for<'a> fn(&'a ())>>` is not satisfied
2   --> $DIR/principal-upcast-region-eq-issue-157859.rs:6:49
3    |
4 LL |         let b: &dyn Super<for<'a> fn(&'a ())> = a;

5    |                                                 ^ the nightly-only, unstable trait `Unsize<dyn Super<for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
6    |
7    = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
-    = note: required for `&dyn Sub` to implement `CoerceUnsized<&dyn Super<for<'a> fn(&'a ())>>`
9    = note: required for the cast from `&dyn Sub` to `&dyn Super<for<'a> fn(&'a ())>`
10 
11 error: aborting due to 1 previous error


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
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/assumptions_on_binders/principal-upcast-region-eq-issue-157859.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" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859" "-Znext-solver=coherence" "-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" "--edition=2015" "-Zassumptions-on-binders" "-Znext-solver=globally"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<for<'a> fn(&'a ())>>` is not satisfied
##[error]  --> /checkout/tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs:6:49
   |
LL |         let b: &dyn Super<for<'a> fn(&'a ())> = a;
   |                                                 ^ the nightly-only, unstable trait `Unsize<dyn Super<for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
   |
   = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
   = note: required for the cast from `&dyn Sub` to `&dyn Super<for<'a> fn(&'a ())>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------

---- [ui] tests/ui/assumptions_on_binders/principal-upcast-region-eq-issue-157859.rs stdout end ----
---- [ui] tests/ui/assumptions_on_binders/trait-upcast-projection-region-eq.rs stdout ----
Saved the actual stderr to `/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/trait-upcast-projection-region-eq/trait-upcast-projection-region-eq.stderr`
diff of stderr:

- error[E0277]: the trait bound `&dyn Sub: CoerceUnsized<&dyn Super<Assoc = for<'a> fn(&'a ())>>` is not satisfied
+ error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not satisfied
2   --> $DIR/trait-upcast-projection-region-eq.rs:8:57
3    |
4 LL |         let b: &dyn Super<Assoc = for<'a> fn(&'a ())> = a;

5    |                                                         ^ the nightly-only, unstable trait `Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
6    |
7    = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
-    = note: required for `&dyn Sub` to implement `CoerceUnsized<&dyn Super<Assoc = for<'a> fn(&'a ())>>`
9    = note: required for the cast from `&dyn Sub` to `&dyn Super<Assoc = for<'a> fn(&'a ())>`
10 
11 error: aborting due to 1 previous error


The actual stderr differed from the expected stderr
To update references, rerun the tests and pass the `--bless` flag
To only update this specific test, also pass `--test-args assumptions_on_binders/trait-upcast-projection-region-eq.rs`

error: 1 errors occurred comparing output.
status: exit status: 1
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/assumptions_on_binders/trait-upcast-projection-region-eq.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" "--emit" "metadata" "-C" "prefer-dynamic" "--out-dir" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/ui/assumptions_on_binders/trait-upcast-projection-region-eq" "-Znext-solver=coherence" "-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" "--edition=2015" "-Zassumptions-on-binders" "-Znext-solver=globally"
stdout: none
--- stderr -------------------------------
error[E0277]: the trait bound `dyn Sub: Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not satisfied
##[error]  --> /checkout/tests/ui/assumptions_on_binders/trait-upcast-projection-region-eq.rs:8:57
   |
LL |         let b: &dyn Super<Assoc = for<'a> fn(&'a ())> = a;
   |                                                         ^ the nightly-only, unstable trait `Unsize<dyn Super<Assoc = for<'a> fn(&'a ())>>` is not implemented for `dyn Sub`
   |
   = note: all implementations of `Unsize` are provided automatically by the compiler, see <https://doc.rust-lang.org/stable/std/marker/trait.Unsize.html> for more information
   = note: required for the cast from `&dyn Sub` to `&dyn Super<Assoc = for<'a> fn(&'a ())>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.
------------------------------------------

Important

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

rust-bors · 2026-11-10T16:36:56Z

💔 Test for 8695fd2 failed: CI. Failed jobs:

try - test-aarch64-apple-1 (web logs, enhanced plaintext logs)
try - test-armhf-gnu (web logs, enhanced plaintext logs)
try - test-i686-msvc (web logs, enhanced plaintext logs)
try - test-various (web logs, enhanced plaintext logs)
try - test-x86_64-gnu-llvm-22-3 (web logs, enhanced plaintext logs)
(and 3 other jobs)

estebank and others added 30 commits September 24, 2026 05:44

Add test for FnMut closure moving value

f9878e1

Preserve equality when relating binder regions

143e186

Keep region equality in the unification table and transport its deferred outlives requirements through solver constraints. Record directed constraints for subtype relations under assumptions on binders.

Test equality and variance across binder boundaries

754a3c8

Move trivial_field_reads from trait to impl trait fn

9c6e032

stop using gce in a test

2ee054c

Feat: move trait gate

6d1c8f1

add the trait and the trait gate

Fix: rustdoc tests

aafd174

see similar fixes on the forget

Fix: core doctests need the relaxed bound policy

45b068b

Keep the minimum required musl version at 1.2.5

9882511

fix NumScalableVectors::from_field_count

ad13cdf

add core::arch::{x86, x86_64}::x87_f80

a79fce1

rename Reg::align and Uniform::align to scratch_align

9da70e9

use type_padding_filler for x87_f80_raw in arrays and structs

3592132

add assert that we never cast to x87_f80

cc199fa

adjust comments on backend type functions

802a33e

support x87_f80 in const eval's try_visit_primitive

7274b42

Without it, reads are reported as UB because the tracking of what bytes are initialized is incorect

interpret: ensure newly created unions have uninit in their padding

e7007d3

Fix: fast path for rustdoc

a4016e0

added a fast path in the rustdoc helper, assuming that move is implemented everywhere if the feature is off

std Miri testing: use skip_unsupported_miri_tests to control when tes…

3cf3c87

…ts should be skipped in Miri due to missing shims

Unignore passing GCC backend tests

0aa6251

mpsc_sync::stream_send_recv_stress: wait for all thread to finish

0e99915

fix MSVC calling convention symbol byte counts

d11b3f4

Change the span building of paths from first-to-last to chained

8d31601

Remove backend_optimization_level.

b52077c

Turns out that all uses were effectively equivalent to using sess.opts.optimize.

Partially stabilize ptr_alignment_type as alignment_type

6e05a38

docs(num): remove needless whitespaces

117c517

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std: use skip_unsupported_miri_tests to control when tests should be skipped in Miri due to missing shims #165117

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JonathanBrouwer closed this Nov 10, 2026

rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Nov 10, 2026

JonathanBrouwer mentioned this pull request Nov 10, 2026

-Zassumptions-on-binders: Emit new-style region constraints from type relations #157984

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rust-bors Bot added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Nov 10, 2026

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Rollup of 23 pull requests - #165756

Rollup of 23 pull requests#165756
JonathanBrouwer wants to merge 61 commits into
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