Rollup of 8 pull requests

[matthiaskrgr]

Successful merges:

• add extend_front to VecDeque with specialization like extend #146861 (add extend_front to VecDeque with specialization like extend)
• Fix invalid tag closing when leaving expansion "original code" #148213 (Fix invalid tag closing when leaving expansion "original code")
• Un-shadow object bound candidate in NormalizesTo goal if self_ty is trait object #148292 (Un-shadow object bound candidate in NormalizesTo goal if self_ty is trait object)
• run-make tests: use edition 2024 #148528 (run-make tests: use edition 2024)
• Add regression test for issue 148542 #148554 (Add regression test for issue 148542)
• Fix suggestion for returning async closures #148556 (Fix suggestion for returning async closures)
• Fix ICE from async closure variance #148561 (Fix ICE from async closure variance)
• rustdoc-search: remove broken index special case #148563 (rustdoc-search: remove broken index special case)

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[rust-log-analyzer]

The job aarch64-gnu-llvm-20-1 failed! Check out the build log: (web) (plain enhanced) (plain)

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

Saved the actual stderr to `/checkout/obj/build/aarch64-unknown-linux-gnu/test/ui/async-await/async-closures/ice-async-closure-variance-issue-148488/ice-async-closure-variance-issue-148488.stderr`
diff of stderr:

11    |
12 LL | fn ord<a>() -> _ {
13    |                ^ not allowed in type signatures
+    |
+ help: replace with an appropriate return type
+    |
+ LL - fn ord<a>() -> _ {
+ LL + fn ord<a>() -> impl AsyncFn() {
+    |
14 
15 error[E0392]: lifetime parameter `'g` is never used
16   --> $DIR/ice-async-closure-variance-issue-148488.rs:3:10


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 async-await/async-closures/ice-async-closure-variance-issue-148488.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/aarch64-unknown-linux-gnu/stage2/bin/rustc" "/checkout/tests/ui/async-await/async-closures/ice-async-closure-variance-issue-148488.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/async-await/async-closures/ice-async-closure-variance-issue-148488" "-A" "unused" "-W" "unused_attributes" "-A" "internal_features" "-A" "unused_parens" "-A" "unused_braces" "-Crpath" "-Cdebuginfo=0" "-Lnative=/checkout/obj/build/aarch64-unknown-linux-gnu/native/rust-test-helpers" "--edition=2024"
stdout: none
--- stderr -------------------------------
warning: type parameter `a` should have an upper camel case name
##[warning]  --> /checkout/tests/ui/async-await/async-closures/ice-async-closure-variance-issue-148488.rs:6:8
   |
LL | fn ord<a>() -> _ {
   |        ^ help: convert the identifier to upper camel case: `A`
   |
   = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default

error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types
##[error]  --> /checkout/tests/ui/async-await/async-closures/ice-async-closure-variance-issue-148488.rs:6:16
   |
LL | fn ord<a>() -> _ {
   |                ^ not allowed in type signatures
   |
help: replace with an appropriate return type
   |
LL - fn ord<a>() -> _ {
LL + fn ord<a>() -> impl AsyncFn() {
   |

error[E0392]: lifetime parameter `'g` is never used
##[error]  --> /checkout/tests/ui/async-await/async-closures/ice-async-closure-variance-issue-148488.rs:3:10
   |
LL | struct T<'g>();
   |          ^^ unused lifetime parameter
   |
   = help: consider removing `'g`, referring to it in a field, or using a marker such as `PhantomData`

error: aborting due to 2 previous errors; 1 warning emitted

Some errors have detailed explanations: E0121, E0392.
For more information about an error, try `rustc --explain E0121`.