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

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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.

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

Paladynee · 2026-05-16T05:12:49Z

any updates? @jhpratt

jhpratt · 2026-05-30T17:07:29Z

Sorry, I was travelling Europe for the past couple weeks :)

@bors r+

rust-bors · 2026-05-30T17:07:32Z

📌 Commit cd1f625 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 6 pull requests Successful merges: - #156832 (library: use strict provenance lints consistently) - #157006 (net tests: let the OS pick the port numbers) - #157126 (Avoid redundant note when a #[derive] is already suggested) - #151690 (std: Refactor `env::var` function) - #155826 (std::process: uefi: avoid panicking in Stdio From impls.) - #156109 (Migrate libraries from ptr::slice_from_raw_parts to .cast_slice)

…uwer Rollup of 8 pull requests Successful merges: - #157006 (net tests: let the OS pick the port numbers) - #157126 (Avoid redundant note when a #[derive] is already suggested) - #151690 (std: Refactor `env::var` function) - #155826 (std::process: uefi: avoid panicking in Stdio From impls.) - #156109 (Migrate libraries from ptr::slice_from_raw_parts to .cast_slice) - #156642 (`offload_kernel` macro expansion) - #156823 (Add regression test) - #157162 (elaborate_drop: Avoid as_mut.unwrap dance, empty vectors are cheap.) Failed merges: - #157173 (rustc-dev-guide subtree update)

Rollup merge of #156109 - Paladynee:lib/cast-slice-improvements, r=jhpratt 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.

…uwer Rollup of 8 pull requests Successful merges: - rust-lang/rust#157006 (net tests: let the OS pick the port numbers) - rust-lang/rust#157126 (Avoid redundant note when a #[derive] is already suggested) - rust-lang/rust#151690 (std: Refactor `env::var` function) - rust-lang/rust#155826 (std::process: uefi: avoid panicking in Stdio From impls.) - rust-lang/rust#156109 (Migrate libraries from ptr::slice_from_raw_parts to .cast_slice) - rust-lang/rust#156642 (`offload_kernel` macro expansion) - rust-lang/rust#156823 (Add regression test) - rust-lang/rust#157162 (elaborate_drop: Avoid as_mut.unwrap dance, empty vectors are cheap.) Failed merges: - rust-lang/rust#157173 (rustc-dev-guide subtree update)

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

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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

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

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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

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-review Status: Awaiting review from the assignee but also interested parties. labels May 30, 2026

jhpratt mentioned this pull request May 30, 2026

Rollup of 6 pull requests #157167

Closed

JonathanBrouwer mentioned this pull request May 30, 2026

Rollup of 8 pull requests #157174

Merged

rust-bors Bot merged commit 694e1f9 into rust-lang:main May 31, 2026
11 checks passed

rustbot added this to the 1.98.0 milestone May 31, 2026

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