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Lint single-use lifetimes during AST resolution #96833

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merged 3 commits into from
May 20, 2022
Merged

Lint single-use lifetimes during AST resolution #96833

merged 3 commits into from
May 20, 2022

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cjgillot
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@cjgillot cjgillot commented May 8, 2022 •
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This PR rewrites single_use_lifetime and unused_lifetime lints to be based on the AST.
We have more information at our disposal, so we can reduce the amount of false positives.

Remaining false positive: single-use lifetimes in argument-position impl-trait.
I'm waiting for #96529 to be fixed to have a clean and proper solution here.

Closes #54079
Closes #55057
Closes #55058
Closes #60554
Closes #69952

r? @petrochenkov

@cjgillot cjgillot added the S-blocked Status: Marked as blocked ❌ on something else such as an RFC or other implementation work. label May 8, 2022
@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label May 8, 2022
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@petrochenkov petrochenkov removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label May 8, 2022
@cjgillot cjgillot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-blocked Status: Marked as blocked ❌ on something else such as an RFC or other implementation work. labels May 10, 2022
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petrochenkov
petrochenkov reviewed May 19, 2022
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compiler/rustc_lint/src/context.rs Outdated Show resolved Hide resolved
src/test/ui/single-use-lifetime/one-use-in-struct.rs Show resolved Hide resolved
src/test/ui/async-await/unused-lifetime.rs Outdated Show resolved Hide resolved
compiler/rustc_lint/src/levels.rs Show resolved Hide resolved
compiler/rustc_resolve/src/late.rs Outdated Show resolved Hide resolved
compiler/rustc_resolve/src/late.rs Outdated Show resolved Hide resolved
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@petrochenkov petrochenkov added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 19, 2022
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r=me after squashing review commits into main commits.
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@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 May 19, 2022
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@bors r=petrochenkov

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bors commented May 20, 2022

📌 Commit 563916d has been approved by petrochenkov

@bors bors 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 20, 2022
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bors commented May 20, 2022

⌛ Testing commit 563916d with merge b5caa5a...

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bors commented May 20, 2022

☀️ Test successful - checks-actions
Approved by: petrochenkov
Pushing b5caa5a to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label May 20, 2022
@bors bors merged commit b5caa5a into rust-lang:master May 20, 2022
@rustbot rustbot added this to the 1.63.0 milestone May 20, 2022
This was referenced May 20, 2022
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Finished benchmarking commit (b5caa5a): comparison url.

Instruction count

  • Primary benchmarks: no relevant changes found
  • Secondary benchmarks: 🎉 relevant improvement found
Regressions 😿
(primary)		 Regressions 😿
(secondary)		 Improvements 🎉
(primary)		 Improvements 🎉
(secondary)		 All 😿 🎉
(primary)
count1 0 0 0 1 0
mean2 N/A N/A N/A -0.6% N/A
max N/A N/A N/A -0.6% N/A

Max RSS (memory usage)

Results
  • Primary benchmarks: mixed results
  • Secondary benchmarks: 😿 relevant regression found
Regressions 😿
(primary)		 Regressions 😿
(secondary)		 Improvements 🎉
(primary)		 Improvements 🎉
(secondary)		 All 😿 🎉
(primary)
count1 1 1 2 0 3
mean2 2.4% 3.6% -2.4% N/A -0.8%
max 2.4% 3.6% -2.5% N/A -2.5%

Cycles

Results
  • Primary benchmarks: mixed results
  • Secondary benchmarks: mixed results
Regressions 😿
(primary)		 Regressions 😿
(secondary)		 Improvements 🎉
(primary)		 Improvements 🎉
(secondary)		 All 😿 🎉
(primary)
count1 1 2 2 2 3
mean2 3.4% 1.8% -2.2% -1.9% -0.3%
max 3.4% 2.3% -2.6% -2.7% 3.4%

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

@rustbot label: -perf-regression

Footnotes

  1. number of relevant changes ↩ ↩2 ↩3

  2. the arithmetic mean of the percent change ↩ ↩2 ↩3

@cjgillot cjgillot deleted the ast-lifetimes-single branch May 22, 2022 08:56
@est31 est31 mentioned this pull request May 29, 2022
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@oskgo oskgo mentioned this pull request Jan 25, 2024
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