add relnotes 1.99.0 by BoxyUwU · Pull Request #163435 · rust-lang/rust

BoxyUwU · 2026-09-28T11:05:53Z

r? mark-simulacrum

cc @rust-lang/release

rustbot · 2026-09-28T11:05:56Z

RELEASES.md was changed. Upon merging, each section will be automatically synced with its corresponding GitHub releases, but only from the main branch.

If it's not already the case, make sure to also merge the changes in the main branch.

BoxyUwU · 2026-09-28T11:06:32Z

@rustbot ping relnotes-interest-group

rustbot · 2026-09-28T11:06:34Z

Hi relnotes-interest-group, this issue/PR could use some help in reviewing /
adjusting release notes. Could you take a look if available? Thanks <3

cc @alex-semenyuk @jieyouxu @joshtriplett @lcnr @traviscross @weihanglo

jieyouxu

Looks good after nits

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weihanglo

Thanks for consolidating all changes!

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[stable] 1.99.0 release https://forge.rust-lang.org/release/process.html#stable-pr Cherry-picks current state of relnotes (#163435), ultimately the main branch will have the authoritative copy unless we rebuild artifacts for some reason. r? me

BoxyUwU · 2026-09-29T10:16:06Z

@bors squash msg="add relnotes 1.99.0"

Co-authored-by: Asger Hautop Drewsen <asger@tyilo.com> Co-authored-by: Boxy <rust@boxyuwu.dev> Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com> Co-authored-by: 许杰友 Jieyou Xu (Joe) <39484203+jieyouxu@users.noreply.github.com>

rust-bors · 2026-09-29T10:16:30Z

🔨 6 commits were squashed into da3a408.

theemathas · 2026-09-29T17:09:18Z

@lcnr @jdonszelmann Does #158436 need release notes due to #161916?
And does #158447 need release notes due to #161913?

weihanglo

Thanks ❤️.

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BoxyUwU · 2026-09-30T11:44:25Z

@bors r+ p=1 rollup

rust-bors · 2026-09-30T11:44:29Z

📌 Commit da3a408 has been approved by BoxyUwU

It is now in the queue for this repository.

add relnotes 1.99.0 r? mark-simulacrum cc @rust-lang/release

Mark-Simulacrum · 2026-09-30T12:34:30Z

@bors p=9

This needs to land by tomorrow morning (US Eastern) to be ready by the release, so bumping priority a bit more. I'm expecting it'll get pulled into rollups sufficient to make that happen (as per the above).

JonathanBrouwer · 2026-09-30T13:17:08Z

The queue is not very large atm, let's reduce risk and just run this on its own after the PR that is currently running :)

rust-bors · 2026-09-30T18:09:03Z

☀️ Test successful - CI
Approved by: BoxyUwU
Duration: 3h 5m 58s
Pushing 21b707e to main...

github-actions · 2026-09-30T18:12:46Z

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 1625626 (parent) -> 21b707e (this PR)

Test differences

Show 2 test diffs

2 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 21b707e3f97e0b522ebd2f277a862339625ad83f --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

test-x86_64-msvc-1: 1h 44m -> 2h 53m (+66.1%)
test-x86_64-gnu-stable: 1h 39m -> 2h 39m (+60.6%)
test-x86_64-gnu: 1h 33m -> 2h 19m (+50.0%)
test-x86_64-gnu-llvm-22-3: 1h 16m -> 1h 52m (+46.2%)
test-x86_64-gnu-gcc: 1h 19m -> 48m 53s (-38.1%)
test-armhf-gnu: 1h 32m -> 58m 38s (-36.8%)
test-aarch64-apple-macos-26-1: 2h 16m -> 1h 26m (-36.2%)
test-x86_64-mingw-1: 2h 16m -> 3h 4m (+35.7%)
dist-x86_64-netbsd: 1h 33m -> 1h (-35.5%)
test-x86_64-gnu-nopt: 2h 28m -> 1h 37m (-34.2%)

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 · 2026-09-30T18:58:25Z

Finished benchmarking commit (21b707e): comparison URL.

Overall result: ❌ regressions - no action needed

@rustbot label: -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.3%	[0.3%, 0.3%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 2.0%)

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

	mean	range	count
Regressions ❌ (primary)	2.0%	[2.0%, 2.0%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.0%	[2.0%, 2.0%]	1

Cycles

Results (primary 0.4%, secondary 14.5%)

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

	mean	range	count
Regressions ❌ (primary)	3.3%	[3.3%, 3.3%]	1
Regressions ❌ (secondary)	22.8%	[22.2%, 23.5%]	2
Improvements ✅ (primary)	-2.4%	[-2.4%, -2.4%]	1
Improvements ✅ (secondary)	-2.2%	[-2.2%, -2.2%]	1
All ❌✅ (primary)	0.4%	[-2.4%, 3.3%]	2

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 489.563s -> 487.961s (-0.33%)
Artifact size: 406.52 MiB -> 406.51 MiB (-0.00%)

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-release Relevant to the release subteam, which will review and decide on the PR/issue. labels Sep 28, 2026

rustbot assigned Mark-Simulacrum Sep 28, 2026

BoxyUwU mentioned this pull request Sep 28, 2026

Draft release notes for 1.99.0 #162306

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[stable] 1.99.0 release #163440

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BoxyUwU commented Sep 28, 2026

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add relnotes 1.99.0

da3a408

Co-authored-by: Asger Hautop Drewsen <asger@tyilo.com> Co-authored-by: Boxy <rust@boxyuwu.dev> Co-authored-by: Mark Rousskov <mark.simulacrum@gmail.com> Co-authored-by: 许杰友 Jieyou Xu (Joe) <39484203+jieyouxu@users.noreply.github.com>

rust-bors Bot force-pushed the relnotes_1_99 branch from 8bced44 to da3a408 Compare September 29, 2026 10:16

weihanglo reviewed Sep 29, 2026

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weihanglo approved these changes Sep 29, 2026

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rust-bors Bot added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Sep 30, 2026

rust-bors Bot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 30, 2026

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Sep 30, 2026

Rollup merge of rust-lang#163435 - BoxyUwU:relnotes_1_99, r=BoxyUwU

7de795b

add relnotes 1.99.0 r? mark-simulacrum cc @rust-lang/release

JonathanBrouwer mentioned this pull request Sep 30, 2026

Rollup of 3 pull requests #163539

Closed

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Sep 30, 2026

Rollup merge of rust-lang#163435 - BoxyUwU:relnotes_1_99, r=BoxyUwU

3116943

add relnotes 1.99.0 r? mark-simulacrum cc @rust-lang/release

JonathanBrouwer mentioned this pull request Sep 30, 2026

Rollup of 14 pull requests #163540

Closed

JonathanBrouwer added a commit to JonathanBrouwer/rust that referenced this pull request Sep 30, 2026

Rollup merge of rust-lang#163435 - BoxyUwU:relnotes_1_99, r=BoxyUwU

14ea04f

add relnotes 1.99.0 r? mark-simulacrum cc @rust-lang/release

JonathanBrouwer mentioned this pull request Sep 30, 2026

Rollup of 13 pull requests #163542

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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 Sep 30, 2026

rust-bors Bot merged commit 21b707e into rust-lang:main Sep 30, 2026
14 checks passed

rustbot added this to the 1.101.0 milestone Sep 30, 2026

github-actions Bot mentioned this pull request Oct 3, 2026

Toolchain upgrade to nightly-2026-10-09 flux-rs/flux#1811

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Test differences

Job duration changes

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rust-timer commented Sep 30, 2026

Overall result: ❌ regressions - no action needed

Instruction count

Max RSS (memory usage)

Cycles

Binary size

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