Stabilize noop_waker

[eholk]

Tracking Issue: #98286

This is a handy feature that's been used widely in tests and example async code and it'd be nice to make it available to users.

cc @rust-lang/wg-async

[rustbot]

r? @TaKO8Ki

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[yoshuawuyts]

Stabilizing this seems reasonable to me! We spent an extended period discussing this in @rust-lang/wg-async triage earlier this year, and I believe we were generally in favor of moving forward with this API. Thank you for putting this up!

[Amanieu]

@rfcbot fcp merge

[rfcbot]

Team member @Amanieu has proposed to merge this. The next step is review by the rest of the tagged team members:

• @Amanieu
• @BurntSushi
• @dtolnay
• @joshtriplett
• @m-ou-se

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

See this document for info about what commands tagged team members can give me.

[rfcbot]

🔔 This is now entering its final comment period, as per the review above. 🔔

[rustbot]

Some changes occurred in tests/ui/sanitizer

cc @rust-lang/project-exploit-mitigations, @rcvalle

The Miri subtree was changed

cc @rust-lang/miri

Some changes occurred in coverage tests.

cc @Zalathar

[bors]

☔ The latest upstream changes (presumably #133349) made this pull request unmergeable. Please resolve the merge conflicts.

[rust-timer]

Finished benchmarking commit (8dc8377): 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)

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

Cycles

Results (secondary 1.5%)

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)	2.2%	[1.5%, 2.8%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.3%	[-2.3%, -2.3%]	1
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: 770.082s -> 769.893s (-0.02%)
Artifact size: 330.91 MiB -> 330.91 MiB (-0.00%)

[jieyouxu]

This also spuriously failed on msvc after it failed mingw