Rollup of 8 pull requests by jhpratt · Pull Request #158941 · rust-lang/rust

jhpratt · 2026-07-08T03:53:49Z

Successful merges:

Move std::io::Write to core::io #158541 (Move std::io::Write to core::io)
intrinsics: Add a fallback for non-const libm float functions #150946 (intrinsics: Add a fallback for non-const libm float functions)
Fix coroutine MIR saved local remapping #158655 (Fix coroutine MIR saved local remapping)
Update wasm-component-ld to 0.5.26 #158920 (Update wasm-component-ld to 0.5.26)
wrapping_sh* methods: clarify underspecified reference #158926 (wrapping_sh* methods: clarify underspecified reference)
Stabilize VecDeque::retain_back from truncate_front #151379 (Stabilize VecDeque::retain_back from truncate_front)
Update browser-ui-test version to 0.24.1 #158913 (Update browser-ui-test version to 0.24.1)
std: support real fd methods on Emscripten #158935 (std: support real fd methods on Emscripten)

Signed-off-by: Xiangfei Ding <dingxiangfei2009@protonmail.ch>

Storage is still required even if the local is moved out and immediately moved in again. Signed-off-by: Xiangfei Ding <dingxiangfei2009@protonmail.ch>

Co-Authored-By: Clar Fon <15850505+clarfonthey@users.noreply.github.com>

Moves unsafe code from `alloc::io` into `alloc::vec`. A more general `try_extend_from_slice` may be useful in the future, but that requires changing how specialization is done for `SpecExtend` and that's a lot for an internal-only function.

Same as rust-lang/rust/147495, just keeping it up-to-date.

in `is_call_from_compiler_builtins_to_upstream_monomorphization`, suggested by Saethlin

We'll do this using `-Zforce-intrinsic-fallback` in the main repo going forward

A number of float operations from libm have intrinsics for optimization, but it is also okay to just call the libm functions directly. Add a fallback for these cases, including converting to/from another float size where needed, so the backends don't need to override these. We do not add a fallback body for intrinsics that have a softfloat implementation (e.g. sqrt, fma), because it would make them harder to constify later.

Emscripten targets wasm32 but provides a working POSIX fd layer, including fcntl(F_DUPFD_CLOEXEC) and dup2(), so it should use the real implementations rather than the wasm32 UNSUPPORTED_PLATFORM stubs: - try_clone_to_owned now uses fcntl(F_DUPFD_CLOEXEC) instead of returning UNSUPPORTED_PLATFORM - replace_stdio_fd now uses dup2() instead of the wasm32 fallback

…rfonthey Move `std::io::Write` to `core::io` ACP: rust-lang/libs-team#755 Tracking issue: rust-lang#154046 Split From: rust-lang#156527 ~~Blocked On: rust-lang#158537 ~~Blocked On: rust-lang#158540 ## Description Moves `std::io::Write` to `core::io`. This is effectively a direct cut and paste, but with a large diff due to how many implementations need to be moved into `alloc` and `core`. Blocked on rust-lang#158537 and rust-lang#158540. --- ## Notes * No AI tooling of any kind was used during the creation of this PR. * Please see rust-lang#154046 (comment) for a review order and broader context for this PR.

… r=RalfJung,saethlin intrinsics: Add a fallback for non-const libm float functions A number of float operations from libm have intrinsics for optimization, but it is also okay to just call the libm functions directly. Add a fallback for these cases, including converting to/from another float size where needed, so the backends don't need to override these.

…cjgillot Fix coroutine MIR saved local remapping The unsound analysis was found while I was working on the `async-drop` code. Apparently the counter variable in the array drop glue is not correctly identified as a saved local. Also we did not patch up indices in `ProjectionElem::Index` when they are saved locals. The reproduction is in the older commit with the expected output.

…-ld, r=lqd Update wasm-component-ld to 0.5.26 Same as rust-lang#147495, just keeping it up-to-date.

@scottmcm

wrapping_sh* methods: clarify underspecified reference Reading these docs, it was not clear to me whether "the behavior" here refers to the behavior described in the previous sentence, or the behavior of this method. Let's clarify that. Cc @scottmcm who wrote these docs (rust-lang#149837)

@rustbot

…nthey Stabilize `VecDeque::retain_back` from `truncate_front` Tracking issue: rust-lang#140667 Closes: rust-lang#140667 @rustbot label -T-libs +T-libs-api +needs-fcp +S-waiting-on-fcp r? t-libs-api

@jieyouxu

…est, r=jieyouxu Update `browser-ui-test` version to `0.24.1` Fixes rust-lang#157747. It includes GuillaumeGomez/browser-UI-test#749. Hopefully this flaky issue won't be anymore. r? @jieyouxu

…jhpratt std: support real fd methods on Emscripten Emscripten targets wasm32 but provides a working POSIX fd layer, including `fcntl(F_DUPFD_CLOEXEC)` and `dup2()`, so it should use the real implementations rather than the wasm32 `UNSUPPORTED_PLATFORM` stubs: - `try_clone_to_owned` now uses `fcntl(F_DUPFD_CLOEXEC)` instead of returning `UNSUPPORTED_PLATFORM` - `replace_stdio_fd` now uses `dup2()` instead of the `wasm32` fallback

jhpratt · 2026-07-08T03:54:02Z

@bors r+ rollup=never p=5

rust-bors · 2026-07-08T03:54:05Z

📌 Commit c8b1773 has been approved by jhpratt

It is now in the queue for this repository.

Rollup of 8 pull requests Successful merges: - #158541 (Move `std::io::Write` to `core::io`) - #150946 (intrinsics: Add a fallback for non-const libm float functions) - #158655 (Fix coroutine MIR saved local remapping) - #158920 (Update wasm-component-ld to 0.5.26) - #158926 (wrapping_sh* methods: clarify underspecified reference) - #151379 (Stabilize `VecDeque::retain_back` from `truncate_front`) - #158913 (Update `browser-ui-test` version to `0.24.1`) - #158935 (std: support real fd methods on Emscripten)

rust-bors · 2026-07-08T06:30:50Z

💔 Test for 8d127a0 failed: CI. Failed jobs:

auto - aarch64-gnu-llvm-21-1 (web logs, enhanced plaintext logs)
auto - x86_64-rust-for-linux (web logs, enhanced plaintext logs)

jhpratt · 2026-07-08T06:37:14Z

@bors retry spurious

rust-log-analyzer · 2026-07-08T06:40:16Z

A job failed! Check out the build log: (web) (plain enhanced) (plain)

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

Rollup of 8 pull requests Successful merges: - #158541 (Move `std::io::Write` to `core::io`) - #150946 (intrinsics: Add a fallback for non-const libm float functions) - #158655 (Fix coroutine MIR saved local remapping) - #158920 (Update wasm-component-ld to 0.5.26) - #158926 (wrapping_sh* methods: clarify underspecified reference) - #151379 (Stabilize `VecDeque::retain_back` from `truncate_front`) - #158913 (Update `browser-ui-test` version to `0.24.1`) - #158935 (std: support real fd methods on Emscripten)

rust-bors · 2026-07-08T07:29:35Z

💔 Test for a4a7a0f failed: CI. Failed job:

auto - dist-various-2 (web logs, enhanced plaintext logs)

rust-bors · 2026-07-08T07:31:53Z

PR #158541, which is a member of this rollup, was unapproved.

rust-log-analyzer · 2026-07-08T07:40:12Z

The job dist-various-2 failed! Check out the build log: (web) (plain enhanced) (plain)

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cammeresi and others added 26 commits May 12, 2026 17:33

Stabilize VecDeque::retain_back from truncate_front

1d49df6

reproduction of miscompilation

9566dad

Signed-off-by: Xiangfei Ding <dingxiangfei2009@protonmail.ch>

fix remapping in indexing and self-assignments

401dc21

Storage is still required even if the local is moved out and immediately moved in again. Signed-off-by: Xiangfei Ding <dingxiangfei2009@protonmail.ch>

Move std::io::default_write_vectored to core::io

4f42df7

Move std::io::cursorinternals to core::io

a50fd17

Move WriteThroughCursor internals to alloc::io

aa35981

Move std::io::Write to core::io

4f0c3b7

Fix documentation links to Write

9dc5fd5

Add documentation to core::io internal methods

25fb674

Co-Authored-By: Clar Fon <15850505+clarfonthey@users.noreply.github.com>

Reduce visibility of core::io::write::default_write_fmt

63d6ab3

Co-Authored-By: Clar Fon <15850505+clarfonthey@users.noreply.github.com>

Add Vec::try_extend_from_slice_of_bytes

65f6190

Moves unsafe code from `alloc::io` into `alloc::vec`. A more general `try_extend_from_slice` may be useful in the future, but that requires changing how specialization is done for `SpecExtend` and that's a lot for an internal-only function.

Update browser-ui-test version to 0.24.1

6b205c6

Update wasm-component-ld to 0.5.26

9e394da

Same as rust-lang/rust/147495, just keeping it up-to-date.

accept extern calls to compiler-builtin functions

ab783ad

in `is_call_from_compiler_builtins_to_upstream_monomorphization`, suggested by Saethlin

remove -Zmiri-force-intrinsic-fallback test run

47acba7

We'll do this using `-Zforce-intrinsic-fallback` in the main repo going forward

wrapping_sh* methods: clarify underspecified reference

7a28eed

Rollup merge of rust-lang#158920 - alexcrichton:update-wasm-component…

b818543

…-ld, r=lqd Update wasm-component-ld to 0.5.26 Same as rust-lang#147495, just keeping it up-to-date.

Rollup merge of rust-lang#151379 - cammeresi:20260119-trunc, r=clarfo…

5b65eb3

…nthey Stabilize `VecDeque::retain_back` from `truncate_front` Tracking issue: rust-lang#140667 Closes: rust-lang#140667 @rustbot label -T-libs +T-libs-api +needs-fcp +S-waiting-on-fcp r? t-libs-api

Rollup merge of rust-lang#158913 - GuillaumeGomez:update-browser-ui-t…

22d15e1

…est, r=jieyouxu Update `browser-ui-test` version to `0.24.1` Fixes rust-lang#157747. It includes GuillaumeGomez/browser-UI-test#749. Hopefully this flaky issue won't be anymore. r? @jieyouxu

rust-bors Bot added the rollup A PR which is a rollup label Jul 8, 2026

rustbot added A-CI Area: Our Github Actions CI A-testsuite Area: The testsuite used to check the correctness of rustc O-unix Operating system: Unix-like labels Jul 8, 2026

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jhpratt closed this Jul 8, 2026

jhpratt mentioned this pull request Jul 8, 2026

Move std::io::Write to core::io #158541

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jhpratt deleted the rollup-RNmDrGo branch July 8, 2026 07:31

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