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Stabilize alloc::Layout const functions #78305

Merged
merged 1 commit into from
Nov 23, 2020
Merged

Stabilize alloc::Layout const functions #78305

merged 1 commit into from
Nov 23, 2020

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ChrisDenton
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@ChrisDenton ChrisDenton commented Oct 23, 2020 •
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Stabilizes #67521. In particular the following stable methods are stabilized as const fn:

  • size
  • align
  • from_size_align

Stabilizing size and align should not be controversial as they are simple (usize and NonZeroUsize) fields and I don't think there's any reason to make them not const compatible in the future. That being true, the other methods are trivially const. The only other issue being returning a Result from a const fn but this has been made more usable by recent stabilizations.

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r? @m-ou-se

(rust_highfive has picked a reviewer for you, use r? to override)

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 23, 2020
@m-ou-se m-ou-se added A-allocators Area: Custom and system allocators A-const-fn needs-fcp This change is insta-stable, so needs a completed FCP to proceed. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue. labels Oct 23, 2020
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m-ou-se commented Oct 23, 2020 •
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@ChrisDenton Looks like there's still a left over #![feature(const_alloc_layout)] in library/core/src/lib.rs causing the CI to fail. Edit: This was before the force-push.

r? @dtolnay for libs fcp

@rust-highfive rust-highfive assigned dtolnay and unassigned m-ou-se Oct 23, 2020
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ChrisDenton commented Oct 23, 2020 •
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Yeah, sorry. In the end I decided to leave the unstable function because I wasn't sure about stabilizing const on it. If it is stabilized I think it should be const but I was uncertain about committing to that in this PR.

EDIT: My goal was to stabilize the minimum of "obviously" guaranteed const functions. I wasn't sure that I should include unstable functions in that.

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KodrAus commented Nov 6, 2020

cc @rust-lang/wg-const-eval

These seem reasonable to me! But let's make sure the const eval group is on board too. This stabilizes a few accessors on Layout as const.

@rfcbot fcp merge

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rfcbot commented Nov 6, 2020 •
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Team member @KodrAus has proposed to merge this. The next step is review by the rest of the tagged team members:

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 rfcbot added proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. disposition-merge This issue / PR is in PFCP or FCP with a disposition to merge it. labels Nov 6, 2020
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oli-obk commented Nov 6, 2020

But let's make sure the const eval group is on board too.

These look fine to me

@rfcbot rfcbot added the final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. label Nov 12, 2020
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rfcbot commented Nov 12, 2020

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

@rfcbot rfcbot removed the proposed-final-comment-period Proposed to merge/close by relevant subteam, see T-<team> label. Will enter FCP once signed off. label Nov 12, 2020
@rfcbot rfcbot added finished-final-comment-period The final comment period is finished for this PR / Issue. to-announce Announce this issue on triage meeting and removed final-comment-period In the final comment period and will be merged soon unless new substantive objections are raised. labels Nov 22, 2020
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rfcbot commented Nov 22, 2020

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

The RFC will be merged soon.

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oli-obk commented Nov 22, 2020

@bors r+

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bors commented Nov 22, 2020

📌 Commit 0ba3f4c8551df07253cf757d257743abf3559c76 has been approved by oli-obk

@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-review Status: Awaiting review from the assignee but also interested parties. labels Nov 22, 2020
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bors commented Nov 22, 2020

⌛ Testing commit 0ba3f4c8551df07253cf757d257743abf3559c76 with merge a10a301e25729da57aaea6643776088fd794b15d...

memoryruins
memoryruins suggested changes Nov 22, 2020
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library/core/src/alloc/layout.rs Outdated Show resolved Hide resolved
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@bors r- retry

@bors bors added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 22, 2020
@m-ou-se m-ou-se 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Nov 22, 2020
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m-ou-se commented Nov 22, 2020

@ChrisDenton Looks like you accidentally pulled unrelated commits into this PR with a merge commit. Can you rebase/squash instead?

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jyn514 commented Nov 22, 2020

@m-ou-se we're debugging the issue: https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/Git.20help.3F

@ChrisDenton
Stabilize alloc::Layout const functions
9050d12 
Stabilizes #67521. In particular the following stable methods are stabilized as const fn:

* size
* align
* from_size_align
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It should be fixed now. Thanks!

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m-ou-se commented Nov 22, 2020

@bors r=oli-obk

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bors commented Nov 22, 2020

📌 Commit 9050d12 has been approved by oli-obk

@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 Nov 22, 2020
@m-ou-se m-ou-se mentioned this pull request Nov 22, 2020
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bors added a commit to rust-lang-ci/rust that referenced this pull request Nov 22, 2020
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Auto merge of rust-lang#79319 - m-ou-se:rollup-d9n5viq, r=m-ou-se
32da90b 
Rollup of 10 pull requests

Successful merges:

 - rust-lang#76941 (Add f{32,64}::is_subnormal)
 - rust-lang#77697 (Split each iterator adapter and source into individual modules)
 - rust-lang#78305 (Stabilize alloc::Layout const functions)
 - rust-lang#78608 (Stabilize refcell_take)
 - rust-lang#78793 (Clean up `StructuralEq` docs)
 - rust-lang#79267 (BTreeMap: address namespace conflicts)
 - rust-lang#79293 (Add test for eval order for a+=b)
 - rust-lang#79295 (BTreeMap: fix minor testing mistakes in rust-lang#78903)
 - rust-lang#79297 (BTreeMap: swap the names of NodeRef::new and Root::new_leaf)
 - rust-lang#79299 (Stabilise `then`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 186ec64 into rust-lang:master Nov 23, 2020
@rustbot rustbot added this to the 1.50.0 milestone Nov 23, 2020
@ChrisDenton ChrisDenton deleted the const-layout branch November 23, 2020 03:55
@spastorino spastorino removed the to-announce Announce this issue on triage meeting label Dec 3, 2020
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relnotes needed?

@oli-obk oli-obk added the relnotes Marks issues that should be documented in the release notes of the next release. label Jan 1, 2021
@RalfJung RalfJung added the A-const-eval Area: Constant evaluation, covers all const contexts (static, const fn, ...) label Dec 1, 2024
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