Rollup of 2 pull requests by JonathanBrouwer · Pull Request #154832 · rust-lang/rust

JonathanBrouwer · 2026-04-04T22:18:46Z

Successful merges:

BorrowedCursor: make init a boolean #150129 (BorrowedCursor: make init a boolean)
miri subtree update #154830 (miri subtree update)

Co-authored-by: Josh Triplett <josh@joshtriplett.org>

This updates the rust-version file to 12ab1cf.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Upstream ref: 12ab1cf Filtered ref: 2df32b408f466131afc57abba520dcc01d9b130f Upstream diff: rust-lang/rust@116458d...12ab1cf This merge was created using https://github.com/rust-lang/josh-sync.

Rustup

Add network socket `read`/`recv` and `write`/`send` shims

This updates the rust-version file to 55e86c9.

Pull recent changes from https://github.com/rust-lang/rust via Josh. Upstream ref: rust-lang/rust@55e86c9 Filtered ref: rust-lang/miri@b7da5a7 Upstream diff: rust-lang/rust@12ab1cf...55e86c9 This merge was created using https://github.com/rust-lang/josh-sync.

…elpers More socket test helpers

Automatic Rustup

ci: update cache action to v5

@joshtriplett

…lett `BorrowedCursor`: make `init` a boolean This PR changes uninitialized bytes tracking in `BorrowedBuf` from being byte-wise to being buffer-wise. I've put all the API around `init` a new unstable feature `borrowed_buf_init`, to split the part that needs it and the part that doesn't. It will avoids accidental stabilization of this part. I'm not really convinced of the rename of `advance_unchecked` to `advance`, but I did it anyway. The old `advance` was kept as `advance_checked`. Alternative of rust-lang#148937 Cc rust-lang#78485 rust-lang#117693 Cc @joshtriplett r? @Amanieu

@ghost

miri subtree update Subtree update of `miri` to rust-lang/miri@ce20bd3. Created using https://github.com/rust-lang/josh-sync. r? @ghost

JonathanBrouwer · 2026-04-04T22:18:58Z

@bors r+ rollup=never p=5

rust-bors · 2026-04-04T22:19:00Z

📌 Commit f359441 has been approved by JonathanBrouwer

It is now in the queue for this repository.

rust-bors · 2026-04-05T03:25:00Z

☀️ Test successful - CI
Approved by: JonathanBrouwer
Duration: 3h 16m 7s
Pushing c92036b to main...

rust-timer · 2026-04-05T03:25:35Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#150129	`BorrowedCursor`: make `init` a boolean	`22a0400e94989e03d44448641618bf2f991250da` (link)
#154830	miri subtree update	`b97b3b74f22ff2174a0d83c33c76ccf23d214ab2` (link)

previous master: 4e836866b5

In the case of a perf regression, run the following command for each PR you suspect might be the cause: @rust-timer build $SHA

github-actions · 2026-04-05T03:27:57Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 4e83686 (parent) -> c92036b (this PR)

Test differences

Show 196 test diffs

196 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard c92036b45babceee1d8d31cac5536207a26369a5 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

dist-aarch64-msvc: 1h 29m -> 1h 47m (+21.0%)
x86_64-gnu-tools: 53m 7s -> 1h 3m (+20.0%)
dist-x86_64-mingw: 2h 27m -> 2h (-18.3%)
x86_64-gnu-llvm-21-2: 1h 24m -> 1h 39m (+17.5%)
pr-check-2: 38m 22s -> 44m 25s (+15.8%)
x86_64-gnu-llvm-21-3: 1h 40m -> 1h 54m (+14.0%)
i686-gnu-2: 1h 29m -> 1h 41m (+13.3%)
x86_64-rust-for-linux: 46m 56s -> 53m 6s (+13.2%)
dist-x86_64-apple: 1h 41m -> 1h 54m (+12.8%)
dist-x86_64-msvc-alt: 2h 50m -> 2h 28m (-12.7%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2026-04-05T04:06:40Z

Finished benchmarking commit (c92036b): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results (primary 2.4%, secondary 0.6%)

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

	mean	range	count
Regressions ❌ (primary)	4.9%	[4.2%, 5.6%]	2
Regressions ❌ (secondary)	2.3%	[1.0%, 4.7%]	5
Improvements ✅ (primary)	-2.6%	[-2.6%, -2.6%]	1
Improvements ✅ (secondary)	-3.5%	[-3.8%, -3.2%]	2
All ❌✅ (primary)	2.4%	[-2.6%, 5.6%]	3

Cycles

Results (primary 2.2%, secondary 1.2%)

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

	mean	range	count
Regressions ❌ (primary)	2.2%	[2.2%, 2.2%]	1
Regressions ❌ (secondary)	4.5%	[4.5%, 4.5%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.1%	[-2.1%, -2.1%]	1
All ❌✅ (primary)	2.2%	[2.2%, 2.2%]	1

Binary size

Results (primary -0.1%, secondary 0.0%)

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

	mean	range	count
Regressions ❌ (primary)	0.6%	[0.2%, 1.0%]	2
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	1
Improvements ✅ (primary)	-0.2%	[-0.7%, -0.0%]	8
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.1%	[-0.7%, 1.0%]	10

Bootstrap: 488.015s -> 488.313s (0.06%)
Artifact size: 395.10 MiB -> 395.05 MiB (-0.01%)

a1phyr and others added 21 commits March 10, 2026 18:03

core: make BorrowedCursor::ensure_init return &[u8]

db392d4

core: Make BorrowedBuf::init a boolean

df42b19

Co-authored-by: Josh Triplett <josh@joshtriplett.org>

Rename BorrowedCursor::advance_unchecked to advance

d88f08e

Co-authored-by: Josh Triplett <josh@joshtriplett.org>

Prepare for merging from rust-lang/rust

12cc49a

This updates the rust-version file to 12ab1cf.

bump test dependencies

3abd282

bump rustc-build-sysroot

b1bbd8d

PTHREAD_*_INITIALIZER: only compare a prefix on android

8a59936

Merge pull request rust-lang#4932 from RalfJung/rustup

76b2379

Rustup

Add socket read, recv, write and send shims

c19d30d

Merge pull request rust-lang#4917 from WhySoBad/network-socket-read

48c4526

Add network socket `read`/`recv` and `write`/`send` shims

Add more network socket test helpers

4e541d8

Prepare for merging from rust-lang/rust

244fcb4

This updates the rust-version file to 55e86c9.

Merge pull request rust-lang#4933 from WhySoBad/network-socket-test-h…

73d69af

…elpers More socket test helpers

Merge pull request rust-lang#4936 from rust-lang/rustup-2026-04-03

7d0ab54

Automatic Rustup

ci: update cache action to v5

ae08cb7

Merge pull request rust-lang#4939 from xtqqczze/actions-cache

96b2eaa

ci: update cache action to v5

update lockfile

21256d8

Rollup merge of rust-lang#154830 - RalfJung:miri, r=RalfJung

f359441

miri subtree update Subtree update of `miri` to rust-lang/miri@ce20bd3. Created using https://github.com/rust-lang/josh-sync. r? @ghost

rust-bors bot added the rollup A PR which is a rollup label Apr 4, 2026

rustbot added O-SGX Target: SGX O-windows Operating system: Windows S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels Apr 4, 2026

rust-bors bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 4, 2026

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rust-bors bot added merged-by-bors This PR was explicitly merged by bors. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Apr 5, 2026

rust-bors bot merged commit c92036b into rust-lang:main Apr 5, 2026
12 checks passed

rustbot added this to the 1.96.0 milestone Apr 5, 2026

rust-bors bot mentioned this pull request Apr 5, 2026

Migrate rest of std::io to alloc #154684

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Rollup of 2 pull requests#154832

Rollup of 2 pull requests#154832
rust-bors[bot] merged 21 commits intorust-lang:mainfrom
JonathanBrouwer:rollup-xJmqF28

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Overall result: no relevant changes - no action needed

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