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Insignificant destructors rfc 2229 #84152

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merged 1 commit into from
May 15, 2021
Merged

Insignificant destructors rfc 2229 #84152

merged 1 commit into from
May 15, 2021

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null-sleep
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@null-sleep null-sleep commented Apr 13, 2021 •
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  • Adds new attribute rustc_insignificant_dtor to annotate the drop method.
  • Adds a query to check if a type has a significant drop.
  • Updates closure analysis to check for significant drops rather than just drop.

A type marked with the attribute rustc_insignificant_dtor is considered to not be significant. A drop is significant if it is implemented by the user or does anything that will have any observable behavior (other than freeing up memory).

rust-lang/project-rfc-2229#35

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r? @estebank

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Apr 13, 2021
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r? @ghost

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Testing with CI. Local build kept ommitting version = 3 from Cargo.lock

@jyn514 jyn514 added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Apr 13, 2021
@crlf0710 crlf0710 added S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels May 1, 2021
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crlf0710 commented May 1, 2021

Triage: switching to S-experimental since reviewer=ghost.

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@null-sleep null-sleep force-pushed the insignificant_dtor branch 2 times, most recently from 5a39524 to f37ed61 Compare May 4, 2021 05:59
arora-aman
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nits, LGTM otherwise

compiler/rustc_middle/src/query/mod.rs Outdated Show resolved Hide resolved
src/test/ui/closures/2229_closure_analysis/migrations/insignificant_drop_attr_migrations.fixed Outdated Show resolved Hide resolved
src/test/ui/closures/2229_closure_analysis/migrations/insignificant_drop_attr_no_migrations.rs Outdated Show resolved Hide resolved
src/test/ui/closures/2229_closure_analysis/migrations/insignificant_drop_attr_migrations.rs Show resolved Hide resolved
@null-sleep null-sleep changed the title add new attribute rustc_insignificant_dtor and a query to check if a … Insignificant destructors rfc 2229 May 4, 2021
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r? @nikomatsakis

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nikomatsakis requested changes May 5, 2021
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compiler/rustc_middle/src/query/mod.rs Outdated Show resolved Hide resolved
compiler/rustc_middle/src/query/mod.rs Outdated Show resolved Hide resolved
compiler/rustc_middle/src/ty/util.rs Outdated Show resolved Hide resolved
compiler/rustc_ty_utils/src/needs_drop.rs Show resolved Hide resolved
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bors commented May 6, 2021

☔ The latest upstream changes (presumably #84982) made this pull request unmergeable. Please resolve the merge conflicts.

@bors bors added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label May 6, 2021
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Looks great! A few more nits.

compiler/rustc_ty_utils/src/needs_drop.rs Outdated Show resolved Hide resolved
compiler/rustc_ty_utils/src/needs_drop.rs Outdated Show resolved Hide resolved
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bors commented May 12, 2021

☔ The latest upstream changes (presumably #84730) made this pull request unmergeable. Please resolve the merge conflicts.

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@bors r+

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bors commented May 15, 2021

📌 Commit a7e1cec has been approved by nikomatsakis

@bors bors removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label May 15, 2021
@bors bors added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label May 15, 2021
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bors commented May 15, 2021

⌛ Testing commit a7e1cec with merge b439be0...

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bors commented May 15, 2021

☀️ Test successful - checks-actions
Approved by: nikomatsakis
Pushing b439be0 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label May 15, 2021
@bors bors merged commit b439be0 into rust-lang:master May 15, 2021
@rustbot rustbot added this to the 1.54.0 milestone May 15, 2021
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@crlf0710 crlf0710 removed the S-experimental Status: Ongoing experiment that does not require reviewing and won't be merged in its current state. label May 23, 2021
@m-ou-se m-ou-se mentioned this pull request Sep 3, 2021
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