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join_path_syms_lazy#149936

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join_path_syms_lazy#149936
yotamofek wants to merge 1 commit intorust-lang:mainfrom
yotamofek:pr/rustdoc/join_path_syms_lazy

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@yotamofek yotamofek commented Dec 13, 2025 •
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Unrelated to, but inspired by, #149915 .
Let's see what this does to perf

@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-rustdoc Relevant to the rustdoc team, which will review and decide on the PR/issue. T-rustdoc-frontend Relevant to the rustdoc-frontend team, which will review and decide on the web UI/UX output. labels Dec 13, 2025
@yotamofek yotamofek marked this pull request as ready for review December 13, 2025 00:33
@rustbot rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Dec 13, 2025
@rustbot rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Dec 13, 2025
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rustbot commented Dec 13, 2025

r? @GuillaumeGomez

rustbot has assigned @GuillaumeGomez.
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@yotamofek yotamofek marked this pull request as draft December 13, 2025 00:34
@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Dec 13, 2025
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yotamofek commented Dec 13, 2025

Sorry, didn't mean to mark this as ready to review, no need to review yet @GuillaumeGomez

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yotamofek commented Dec 13, 2025

Gonna (finally) go to sleep, and CI hasn't failed yet, so I'll trigger a perf run in the meantime.

@bors try @rust-timer queue profiles=Doc

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rust-bors bot added a commit that referenced this pull request Dec 13, 2025
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Auto merge of #149936 - yotamofek:pr/rustdoc/join_path_syms_lazy, r=<…
8b5f0cd 
…try>

`join_path_syms_lazy`
@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Dec 13, 2025
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rust-bors bot commented Dec 13, 2025

☀️ Try build successful (CI)
Build commit: 8b5f0cd (8b5f0cd2e0d097b6c352b7ccf9adfe3dbddedfd7, parent: dc47a69ed94bc88b10b7d500cceacf29b87bcbbe)

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rust-timer commented Dec 13, 2025

Finished benchmarking commit (8b5f0cd): comparison URL.

Overall result: ❌ regressions - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -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)		 0.2% [0.2%, 0.3%] 2
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 0.2% [0.2%, 0.3%] 2

Max RSS (memory usage)

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

Cycles

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

Binary size

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

Bootstrap: 475.622s -> 477.006s (0.29%)
Artifact size: 389.31 MiB -> 389.32 MiB (0.00%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Dec 13, 2025
GuillaumeGomez
GuillaumeGomez reviewed Dec 13, 2025
View reviewed changes
src/librustdoc/html/format.rs
path.iter()
.copied()
.map(|seg| Some(seg).filter(|seg| *seg != kw::PathRoot).maybe_display())
.joined("::", f)
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Why not using intersperse instead?

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