Suggest using `Arc` on `!Send`/`!Sync` types by estebank · Pull Request #88936 · rust-lang/rust

estebank · 2021-09-14T15:48:46Z

No description provided.

rust-highfive · 2021-09-14T15:48:50Z

(rust-highfive has picked a reviewer for you, use r? to override)

m-ou-se · 2021-09-21T08:34:51Z

This now seems to suggest to use Arc<..::Item> instead of ..::Item. It might be useful to say consider using Arc instead of Rc: ....

But That's exactly what this is suggesting: we didn't have an Rc here. Ideally we should be able to tell what context this error is being emitted on, but sadly rustc_on_unimplemented doesn't have that filtering today.

yaahc · 2021-10-04T22:06:20Z

r? rust-lang/compiler

nagisa · 2021-10-08T17:16:25Z

Use of Arc is not always applicable, as both Send and Sync impls for Arc<T> require T: Send + Sync. Unless we can verify T bounds here, I don't think this on clause adds any more clarity over the default note?

Thats fair, but was concerned the default would be too verbose for a case where we could be more straightforward. I can change it.

Well, we can always change this later too. r=me if you don't want to change it.

nagisa · 2021-10-08T17:19:45Z

Out of curiosity, what's the effect of this label clause here? I was thinking that this text would appear near the span underline, but tests indicate that nothing really changed in that particular aspect, at least.

It's the primary span text.

nagisa · 2021-10-17T09:40:17Z

@bors r+

bors · 2021-10-17T09:40:19Z

📌 Commit e2cffd73c83c54c629ed88b30bb7f8a486d0b1ec has been approved by nagisa

bors · 2021-10-17T12:28:01Z

⌛ Testing commit e2cffd73c83c54c629ed88b30bb7f8a486d0b1ec with merge e5fb2513a52b92052d5e17ff7414a5e291ba205d...

bors · 2021-10-17T12:33:07Z

💔 Test failed - checks-actions

estebank · 2021-11-23T20:10:54Z

@bors r=nagisa

bors · 2021-11-23T20:10:56Z

📌 Commit afd717c52628de0c39329c648e56abecf28b9e8f has been approved by nagisa

bors · 2022-03-05T10:39:24Z

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

git checkout send-sync(switch to your branch)
git fetch upstream master(retrieve the latest master)
git rebase upstream/master -p(rebase on top of it)
Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
git push self send-sync --force-with-lease(update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

Auto-merging src/test/ui/traits/inductive-overflow/two-traits.stderr
Auto-merging src/test/ui/issues/issue-7364.stderr
Auto-merging src/test/ui/issues/issue-17718-static-sync.stderr
Auto-merging src/test/ui/issues/issue-16538.thir.stderr
CONFLICT (content): Merge conflict in src/test/ui/issues/issue-16538.thir.stderr
Auto-merging src/test/ui/issues/issue-16538.mir.stderr
CONFLICT (content): Merge conflict in src/test/ui/issues/issue-16538.mir.stderr
Auto-merging src/test/ui/impl-trait/auto-trait-leak2.stderr
CONFLICT (content): Merge conflict in src/test/ui/impl-trait/auto-trait-leak2.stderr
Auto-merging src/test/ui/generator/print/generator-print-verbose-1.stderr
Auto-merging src/test/ui/generator/issue-68112.stderr
Auto-merging src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr
Auto-merging src/test/ui/async-await/issue-71137.stderr
Auto-merging src/test/ui/async-await/issue-70935-complex-spans.stderr
Auto-merging src/test/ui/async-await/issue-68112.stderr
Auto-merging src/test/ui/async-await/issue-67252-unnamed-future.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/issue-67252-unnamed-future.stderr
Auto-merging src/test/ui/async-await/issue-64130-non-send-future-diags.stderr
Auto-merging src/test/ui/async-await/issue-64130-4-async-move.stderr
Auto-merging src/test/ui/async-await/issue-64130-2-send.stderr
Auto-merging src/test/ui/async-await/issue-64130-1-sync.stderr
Auto-merging src/test/ui/async-await/async-fn-nonsend.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/async-fn-nonsend.stderr
Auto-merging src/test/ui/associated-type-bounds/bad-bounds-on-assoc-in-trait.stderr
Auto-merging compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
Automatic merge failed; fix conflicts and then commit the result.

bors · 2022-03-14T11:04:41Z

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

git checkout send-sync(switch to your branch)
git fetch upstream master(retrieve the latest master)
git rebase upstream/master -p(rebase on top of it)
Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
git push self send-sync --force-with-lease(update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

Auto-merging src/test/ui/traits/inductive-overflow/two-traits.stderr
Auto-merging src/test/ui/issues/issue-7364.stderr
Auto-merging src/test/ui/issues/issue-17718-static-sync.stderr
Auto-merging src/test/ui/issues/issue-16538.thir.stderr
CONFLICT (content): Merge conflict in src/test/ui/issues/issue-16538.thir.stderr
Auto-merging src/test/ui/issues/issue-16538.mir.stderr
CONFLICT (content): Merge conflict in src/test/ui/issues/issue-16538.mir.stderr
Auto-merging src/test/ui/impl-trait/auto-trait-leak2.stderr
CONFLICT (content): Merge conflict in src/test/ui/impl-trait/auto-trait-leak2.stderr
Auto-merging src/test/ui/generator/print/generator-print-verbose-1.stderr
Auto-merging src/test/ui/generator/issue-68112.stderr
Auto-merging src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr
Auto-merging src/test/ui/async-await/issue-71137.stderr
Auto-merging src/test/ui/async-await/issue-70935-complex-spans.stderr
Auto-merging src/test/ui/async-await/issue-68112.stderr
Auto-merging src/test/ui/async-await/issue-67252-unnamed-future.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/issue-67252-unnamed-future.stderr
Auto-merging src/test/ui/async-await/issue-64130-non-send-future-diags.stderr
Auto-merging src/test/ui/async-await/issue-64130-4-async-move.stderr
Auto-merging src/test/ui/async-await/issue-64130-2-send.stderr
Auto-merging src/test/ui/async-await/issue-64130-1-sync.stderr
Auto-merging src/test/ui/async-await/async-fn-nonsend.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/async-fn-nonsend.stderr
Auto-merging src/test/ui/associated-type-bounds/bad-bounds-on-assoc-in-trait.stderr
Auto-merging library/core/src/marker.rs
Auto-merging compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
Automatic merge failed; fix conflicts and then commit the result.

bors · 2022-03-26T14:45:55Z

🔒 Merge conflict

This pull request and the master branch diverged in a way that cannot be automatically merged. Please rebase on top of the latest master branch, and let the reviewer approve again.

How do I rebase?

Assuming self is your fork and upstream is this repository, you can resolve the conflict following these steps:

git checkout send-sync(switch to your branch)
git fetch upstream master(retrieve the latest master)
git rebase upstream/master -p(rebase on top of it)
Follow the on-screen instruction to resolve conflicts (check git status if you got lost).
git push self send-sync --force-with-lease(update this PR)

You may also read Git Rebasing to Resolve Conflicts by Drew Blessing for a short tutorial.

Please avoid the "Resolve conflicts" button on GitHub. It uses git merge instead of git rebase which makes the PR commit history more difficult to read.

Sometimes step 4 will complete without asking for resolution. This is usually due to difference between how Cargo.lock conflict is handled during merge and rebase. This is normal, and you should still perform step 5 to update this PR.

Error message

Auto-merging src/test/ui/traits/inductive-overflow/two-traits.stderr
Auto-merging src/test/ui/traits/alias/cross-crate.stderr
CONFLICT (content): Merge conflict in src/test/ui/traits/alias/cross-crate.stderr
Auto-merging src/test/ui/issues/issue-7364.stderr
Auto-merging src/test/ui/issues/issue-17718-static-sync.stderr
Auto-merging src/test/ui/issues/issue-16538.thir.stderr
CONFLICT (content): Merge conflict in src/test/ui/issues/issue-16538.thir.stderr
Auto-merging src/test/ui/issues/issue-16538.mir.stderr
CONFLICT (content): Merge conflict in src/test/ui/issues/issue-16538.mir.stderr
Auto-merging src/test/ui/impl-trait/auto-trait-leak2.stderr
CONFLICT (content): Merge conflict in src/test/ui/impl-trait/auto-trait-leak2.stderr
Auto-merging src/test/ui/generator/print/generator-print-verbose-1.stderr
Auto-merging src/test/ui/generator/issue-68112.stderr
Auto-merging src/test/ui/async-await/issues/issue-65436-raw-ptr-not-send.stderr
Auto-merging src/test/ui/async-await/issue-71137.stderr
Auto-merging src/test/ui/async-await/issue-70935-complex-spans.stderr
Auto-merging src/test/ui/async-await/issue-67252-unnamed-future.stderr
Auto-merging src/test/ui/async-await/issue-64130-non-send-future-diags.stderr
Auto-merging src/test/ui/async-await/issue-64130-4-async-move.stderr
Auto-merging src/test/ui/async-await/issue-64130-2-send.stderr
Auto-merging src/test/ui/async-await/issue-64130-1-sync.stderr
Auto-merging src/test/ui/async-await/async-fn-nonsend.stderr
CONFLICT (content): Merge conflict in src/test/ui/async-await/async-fn-nonsend.stderr
Auto-merging src/test/ui/associated-type-bounds/bad-bounds-on-assoc-in-trait.stderr
Auto-merging library/core/src/marker.rs
Auto-merging compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
Automatic merge failed; fix conflicts and then commit the result.

compiler-errors · 2022-05-07T18:11:39Z

A bors sync made this re-approved, sorry hehe

@bors r-

Dylan-DPC · 2022-11-21T15:39:50Z

Closing this as it is inactive

estebank · 2023-08-09T15:02:00Z

Squashed, rebased on top of current main and re-blessed the tests. No other changes since the prior approval.

@bors r=nagisa

bors · 2023-08-09T15:02:07Z

📌 Commit 9de1a47 has been approved by nagisa

It is now in the queue for this repository.

bors · 2023-08-09T15:35:54Z

⌛ Testing commit 9de1a47 with merge 27a43f0...

compiler-errors · 2023-08-09T16:14:20Z

 }
 ObligationCauseCode::BindingObligation(item_def_id, span)
 | ObligationCauseCode::ExprBindingObligation(item_def_id, span, ..) => {
+ if self.tcx.is_diagnostic_item(sym::Send, item_def_id)


why isn't this commented? seems like something that could use a justification

I'll add a comment.

bors · 2023-08-09T18:09:59Z

☀️ Test successful - checks-actions
Approved by: nagisa
Pushing 27a43f0 to master...

bors · 2023-08-09T18:10:00Z

☀️ Test successful - checks-actions
Approved by: nagisa
Pushing 27a43f0 to master...

rust-timer · 2023-08-09T20:35:45Z

Finished benchmarking commit (27a43f0): 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)

Results

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)	1.7%	[1.2%, 2.1%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

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: 632.651s -> 632.289s (-0.06%)

Revert "Suggest using `Arc` on `!Send`/`!Sync` types" Closesrust-lang#114687. This is a clean revert of rust-lang#88936 + rust-lang#115210. The suggestion to Arc\<{Self}\> when Self does not implement Send is *always* wrong. rust-lang#114842 is considering a way to make a more refined suggestion.

rust-highfive assigned yaahc Sep 14, 2021

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 14, 2021

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estebank force-pushed the send-sync branch from a9a490b to e2cffd7Compare September 17, 2021 10:41

yaahc added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Sep 20, 2021

m-ou-se reviewed Sep 21, 2021
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rust-highfive assigned nagisa and unassigned yaahc Oct 4, 2021

nagisa reviewed Oct 8, 2021
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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-review Status: Awaiting review from the assignee but also interested parties. labels Oct 17, 2021

bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 17, 2021

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jackh726 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 Oct 21, 2021

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JohnCSimon 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 13, 2021

estebank force-pushed the send-sync branch from e2cffd7 to afd717cCompare November 23, 2021 20:09

JohnCSimon 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Feb 27, 2022

Dylan-DPC closed this Nov 21, 2022

estebank reopened this Aug 9, 2023

Suggest using Arc on !Send/!Sync types
9de1a47

estebank force-pushed the send-sync branch from afd717c to 9de1a47Compare August 9, 2023 14:05

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 Aug 9, 2023

compiler-errors reviewed Aug 9, 2023
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bors added the merged-by-bors This PR was explicitly merged by bors. label Aug 9, 2023

bors merged commit 27a43f0 into rust-lang:masterAug 9, 2023

rustbot added this to the 1.73.0 milestone Aug 9, 2023

This was referenced Aug 9, 2023
Enable -Zdrop-tracking-mir by default #107421
Merged
Introduce more fine-grained borrowed locals analysis for generators #112050
Closed
Stop considering moved-out locals when computing auto traits for generators #112279
Closed

dtolnay mentioned this pull request Aug 10, 2023
Suggestion to use Arc<T> is too indiscriminate #114687
Closed

dtolnay mentioned this pull request Aug 28, 2023
Revert "Suggest using Arc on !Send/!Sync types" #115311
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Overall result: no relevant changes - no action needed

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