Migrate libraries from ptr::slice_from_raw_parts to .cast_slice by Paladynee · Pull Request #156109 · rust-lang/rust

Paladynee · 2026-05-03T12:41:14Z

Tracking issue for #![feature(ptr_cast_slice)]: #149103
This commit updates most callsites of ptr::slice_from_raw_parts within ./library to the more concise but unstable postfix .cast_slice() method on raw pointers, using the ptr_cast_slice feature. Some tests in alloctests have also been updated.

No functional change, debatably improved readability.

rustbot · 2026-05-03T12:41:16Z

stdarch is developed in its own repository. If possible, consider making this change to rust-lang/stdarch instead.

cc @Amanieu, @folkertdev, @sayantn

rustbot · 2026-05-03T12:41:18Z

r? @jhpratt

rustbot has assigned @jhpratt.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: libs
libs expanded to 7 candidates
Random selection from Mark-Simulacrum, jhpratt, nia-e

Paladynee · 2026-05-03T12:56:17Z

some notable places like core::slice::from_raw_parts have not been updated, because i felt like changing that would harm readability than improving it.

Paladynee · 2026-05-03T13:26:24Z

hmm wait let me revert that doc change, apparently it is exactly the same in std::ptr::slice_from_raw_parts. this is all so confusing since all the names are super similar lol

xtqqczze · 2026-05-03T22:46:15Z

Could &*ptr::slice_from_raw_parts be written as slice::from_raw_parts?

jhpratt · 2026-05-04T05:08:40Z

stdarch is developed in its own repository. If possible, consider making this change to rust-lang/stdarch instead.

Aside from this, r=me

jhpratt · 2026-05-04T05:08:44Z

@rustbot author

rustbot · 2026-05-04T05:08:49Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

Paladynee · 2026-05-04T17:22:20Z

Could &*ptr::slice_from_raw_parts be written as slice::from_raw_parts?

i believe they are equivalent other than the debug UB assertion, yes

Paladynee · 2026-05-04T17:28:40Z

I'm not touching anything in;

coretests
core::slice
any ptr::slice_from_raw_parts{_mut} call in stable documentations
believe i can revert the stdarch thing since it seems too complicated for me to change for now

with that, i think this pr is ready

@rustbot ready

xtqqczze · 2026-05-05T14:39:54Z

Could &*ptr::slice_from_raw_parts be written as slice::from_raw_parts?

The library/core/src/slice/sort/shared/smallsort.rs changes should be reverted as they conflict with #156192.

Paladynee · 2026-05-06T01:47:34Z

Could &*ptr::slice_from_raw_parts be written as slice::from_raw_parts?

The library/core/src/slice/sort/shared/smallsort.rs changes should be reverted as they conflict with #156192.

done

jhpratt · 2026-05-07T01:54:51Z

@bors r+ rollup

rust-bors · 2026-05-07T01:54:53Z

📌 Commit 14315f9 has been approved by jhpratt

It is now in the queue for this repository.

…nts, r=jhpratt Migrate libraries from ptr::slice_from_raw_parts to .cast_slice Tracking issue for `#![feature(ptr_cast_slice)]`: rust-lang#149103 This commit updates most callsites of ptr::slice_from_raw_parts within ./library to the more concise but unstable postfix `.cast_slice()` method on raw pointers, using the `ptr_cast_slice` feature. Some tests in alloctests have also been updated. No functional change, debatably improved readability.

Rollup of 14 pull requests Successful merges: - #146273 (lint ImproperCTypes: refactor linting architecture (part 2)) - #149509 (Lint unused pub items in binary crates) - #156173 (Fewer global node_id_to_def_id lookups) - #156177 (windows/time: avoid being too close to 0) - #155961 (Deny warnings in the test for crates that are available on stable) - #155981 (Use special DefIds for aliases) - #156109 (Migrate libraries from ptr::slice_from_raw_parts to .cast_slice) - #156130 (Fold/visit tweaks) - #156131 (Metadata macro/query cleanups) - #156202 (llvm: Use correct type for splat mask) - #156227 (Add Trusty OS to the generic error implementation.) - #156237 (compiletest: prevent directives from having multiple revisions) - #156241 (Move tests coercion) - #156258 (Document wasi-sdk minimum versions for WASI targets)

jhpratt · 2026-05-07T06:11:39Z

@bors r-

#156263 (comment)

rust-bors · 2026-05-07T06:11:47Z

This pull request was unapproved.

This PR was contained in a rollup (#156263), which was unapproved.

View changes since this unapproval

jhpratt · 2026-05-08T03:38:55Z

@bors r+

rust-bors · 2026-05-08T03:38:58Z

📌 Commit 2ab86ba has been approved by jhpratt

It is now in the queue for this repository.

Migrate libraries from ptr::slice_from_raw_parts to .cast_slice Tracking issue for `#![feature(ptr_cast_slice)]`: #149103 This commit updates most callsites of ptr::slice_from_raw_parts within ./library to the more concise but unstable postfix `.cast_slice()` method on raw pointers, using the `ptr_cast_slice` feature. Some tests in alloctests have also been updated. No functional change, debatably improved readability.

rust-bors · 2026-05-08T04:35:30Z

💔 Test for bce7e50 failed: CI. Failed job:

auto - test-various (web logs, enhanced plaintext logs)

xtqqczze · 2026-05-08T09:52:01Z

Apparently this file requires changes:

rust/tests/mir-opt/inline/inline_shims.drop.Inline.panic-abort.diff

Lines 39 to 42 in 3e353d7

    
           +                 scope 13 (inlined slice_from_raw_parts_mut::<A>) { 
        
           +                     scope 14 (inlined std::ptr::from_raw_parts_mut::<[A], A>) { 
        
           +                     } 
        
           +                 }

Paladynee · 2026-05-08T22:38:55Z

i ran all tests with --bless and the only change was that file, pushed the changes

rustbot · 2026-05-10T17:38:58Z

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

Paladynee · 2026-05-10T20:14:40Z

@rustbot ready

rustbot added O-SGX Target: SGX S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-libs Relevant to the library team, which will review and decide on the PR/issue. labels May 3, 2026

rustbot assigned jhpratt May 3, 2026

This comment has been minimized.

Sign in to view

Paladynee force-pushed the lib/cast-slice-improvements branch 3 times, most recently from 5533d7b to fced58f Compare May 3, 2026 15:10

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 4, 2026

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 4, 2026

Paladynee force-pushed the lib/cast-slice-improvements branch from fced58f to e030a3f Compare May 4, 2026 17:33

Paladynee force-pushed the lib/cast-slice-improvements branch from e030a3f to 14315f9 Compare May 6, 2026 01:47

rust-bors Bot added the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label May 7, 2026

jhpratt mentioned this pull request May 7, 2026

Rollup of 14 pull requests #156263

Closed

rust-bors Bot 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 May 7, 2026

xtqqczze reviewed May 7, 2026

View reviewed changes

Comment thread library/std/src/sys/pal/sgx/abi/usercalls/alloc.rs Outdated

Paladynee force-pushed the lib/cast-slice-improvements branch from 14315f9 to 2ab86ba Compare May 7, 2026 23:23

rust-bors Bot 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 8, 2026

This comment has been minimized.

Sign in to view

rust-bors Bot 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 May 8, 2026

Paladynee force-pushed the lib/cast-slice-improvements branch from 2ab86ba to e6cc90a Compare May 8, 2026 22:38

rust-bors Bot 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 8, 2026

Migrate libraries from ptr::slice_from_raw_parts to .cast_slice

cd1f625

Paladynee force-pushed the lib/cast-slice-improvements branch from e6cc90a to cd1f625 Compare May 10, 2026 17:38

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels May 10, 2026

Uh oh!

Conversation

Paladynee commented May 3, 2026 • edited by rustbot Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

rustbot commented May 3, 2026

Uh oh!

rustbot commented May 3, 2026

Uh oh!

Paladynee commented May 3, 2026

Uh oh!

This comment has been minimized.

Paladynee commented May 3, 2026

Uh oh!

This comment has been minimized.

xtqqczze commented May 3, 2026

Uh oh!

jhpratt commented May 4, 2026

Uh oh!

jhpratt commented May 4, 2026

Uh oh!

rustbot commented May 4, 2026

Uh oh!

Paladynee commented May 4, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

Paladynee commented May 4, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

xtqqczze commented May 5, 2026

Uh oh!

Paladynee commented May 6, 2026

Uh oh!

jhpratt commented May 7, 2026

Uh oh!

rust-bors Bot commented May 7, 2026

Uh oh!

jhpratt commented May 7, 2026

Uh oh!

rust-bors Bot commented May 7, 2026

Uh oh!

Uh oh!

jhpratt commented May 8, 2026

Uh oh!

rust-bors Bot commented May 8, 2026

Uh oh!

This comment has been minimized.

This comment has been minimized.

rust-bors Bot commented May 8, 2026

Uh oh!

xtqqczze commented May 8, 2026

Uh oh!

Paladynee commented May 8, 2026

Uh oh!

rustbot commented May 10, 2026

Uh oh!

Paladynee commented May 10, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

5 participants

Paladynee commented May 3, 2026 •

edited by rustbot

Loading

Paladynee commented May 4, 2026 •

edited

Loading

Paladynee commented May 4, 2026 •

edited

Loading