Rollup of 6 pull requests

[matthiaskrgr]

Successful merges:

• Guarantee behavior of transmuting Option::<T>::None subject to NPO #137323 (Guarantee behavior of transmuting Option::<T>::None subject to NPO)
• std: sys: net: uefi: Implement TCP4 connect #139254 (std: sys: net: uefi: Implement TCP4 connect)
• refactor CanonicalVarKind #141432 (refactor CanonicalVarKind)
• document some -Z flags as living in the rustc-dev-guide #141480 (document some -Z flags as living in the rustc-dev-guide)
• rustdoc book: add argument explanation for html_playground_url #141486 (rustdoc book: add argument explanation for html_playground_url)
• Enable [issue-links] and [no-mentions] in triagebot #141496 (Enable [issue-links] and [no-mentions] in triagebot)

r? @ghost
@rustbot modify labels: rollup

Create a similar rollup

[matthiaskrgr]

@bors r+ rollup=never p=5

[bors]

📌 Commit f84ffe2 has been approved by matthiaskrgr

It is now in the queue for this repository.

[bors]

⌛ Testing commit f84ffe2 with merge 038d599...

[bors]

☀️ Test successful - checks-actions
Approved by: matthiaskrgr
Pushing 038d599 to master...

[rust-timer]

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#137323	Guarantee behavior of transmuting Option::<T>::None subje…	346676243995e3507ba45e4865bec7d117e88878 (link)
#139254	std: sys: net: uefi: Implement TCP4 connect	0bd126c103c5975e4bb7db1026e2d616e7bd0e5f (link)
#141432	refactor CanonicalVarKind	8f663ed6582861ee3fb4c33db48f3ef01e7a2c25 (link)
#141480	document some -Z flags as living in the rustc-dev-guide	c4a1744ed85ba29fdbfc04b886acfcc111f675c8 (link)
#141486	rustdoc book: add argument explanation for `html_playground…	491a560492428c08f18822c1ffec1d6e77c19cfb (link)
#141496	Enable [issue-links] and [no-mentions] in triagebot	d42fcb7b0467cf7ff46ca5312bbd6819fe510749 (link)

previous master: 3de4f1ccf3

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]

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 3de4f1c (parent) -> 038d599 (this PR)

Test differences

Show 296 test diffs

296 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 038d599eda4fe3e3d78103fba51ee663df86dadf --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

1. dist-aarch64-linux: 7638.6s -> 5648.3s (-26.1%)
2. x86_64-apple-1: 6425.1s -> 7930.2s (23.4%)
3. dist-aarch64-apple: 6469.7s -> 5052.8s (-21.9%)
4. dist-x86_64-apple: 9248.3s -> 7872.0s (-14.9%)
5. aarch64-apple: 4140.3s -> 3682.4s (-11.1%)
6. dist-x86_64-msvc-alt: 7289.4s -> 7995.3s (9.7%)
7. dist-apple-various: 5987.6s -> 5448.8s (-9.0%)
8. x86_64-apple-2: 4322.7s -> 4637.5s (7.3%)
9. x86_64-gnu-llvm-20-1: 5121.6s -> 5429.3s (6.0%)
10. x86_64-gnu-llvm-20-2: 5836.8s -> 6149.8s (5.4%)

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]

Finished benchmarking commit (038d599): comparison URL.

Overall result: ❌✅ regressions and improvements - please read the text below

Our benchmarks found a performance regression caused by this PR.
This might be an actual regression, but it can also be just noise.

Next Steps:

• If the regression was expected or you think it can be justified,
  please write a comment with sufficient written justification, and add
  @rustbot label: +perf-regression-triaged to it, to mark the regression as triaged.
• If you think that you know of a way to resolve the regression, try to create
  a new PR with a fix for the regression.
• If you do not understand the regression or you think that it is just noise,
  you can ask the @rust-lang/wg-compiler-performance working group for help (members of this group
  were already notified of this PR).

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

Instruction count

This is the most reliable metric that we have; it was used to determine the overall result at the top of this comment. However, even this metric can sometimes exhibit noise.

	mean	range	count
Regressions ❌ (primary)	3.0%	[3.0%, 3.0%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.2%]	1
All ❌✅ (primary)	3.0%	[3.0%, 3.0%]	1

Max RSS (memory usage)

Results (primary -3.2%, secondary -3.0%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-3.2%	[-3.2%, -3.2%]	1
Improvements ✅ (secondary)	-3.0%	[-4.9%, -2.0%]	3
All ❌✅ (primary)	-3.2%	[-3.2%, -3.2%]	1

Cycles

Results (primary 2.8%, secondary 0.9%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	2.8%	[2.8%, 2.8%]	1
Regressions ❌ (secondary)	0.9%	[0.9%, 0.9%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.8%	[2.8%, 2.8%]	1

Binary size

Results (primary 1.1%)

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

	mean	range	count
Regressions ❌ (primary)	1.1%	[1.1%, 1.1%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	1.1%	[1.1%, 1.1%]	1

Bootstrap: 777.23s -> 775.41s (-0.23%)
Artifact size: 366.32 MiB -> 366.27 MiB (-0.01%)

[rylev]

Noise in the clap benchmark

@rustbot label: +perf-regression-triaged