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Tracking issue for release notes of #152176: Neon fast path for str::contains #153031

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Tracking issue for release notes of #152176: Neon fast path for str::contains#153031
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T-libsRelevant to the library team, which will review and decide on the PR/issue.relnotesMarks issues that should be documented in the release notes of the next release.relnotes-tracking-issueMarks issues tracking what text to put in release notes.
Milestone
1.95.0

Description

@rustbot
rustbot
opened on Feb 24, 2026

This issue tracks the release notes text for #152176.

cc @JamieCunliffe, @Mark-Simulacrum -- original issue/PR authors and assignees for drafting text

See the forge.rust-lang.org chapter about release notes for an overview of how the release team makes use of these tracking issues.

Release notes text

This section should be edited to specify the correct category(s) for the change, with succinct description(s) of what changed. Some things worth considering:

  • Does this need an additional compat notes section?
  • Was this a libs stabilization that should have additional headers to list new APIs under Stabilized APIs and Const Stabilized APIs?
# Libraries
- [Speed up `str::contains` on aarch64 targets with `neon` target feature enabled by default](https://github.com/rust-lang/rust/pull/152176)

Tip

Use the previous releases for inspiration on how to write the release notes text and which categories to pick.

Release blog section

If this change is notable enough for inclusion in the blog post then this section should be edited to contain a draft for the blog post. Otherwise leave it empty.



Note


If a blog post section is required the release-blog-post label should be added (@rustbot label +release-blog-post) to this issue as otherwise it may be missed by the release team.


Activity
  1. rustbot
    added 
    relnotesMarks issues that should be documented in the release notes of the next release.
     
    T-libsRelevant to the library team, which will review and decide on the PR/issue.
     
    relnotes-tracking-issueMarks issues tracking what text to put in release notes.
     
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
     on Feb 24, 2026
  2. Mark-Simulacrum
    removed 
    needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging
     on Feb 24, 2026
  3. rustbot
    added this to the  1.95.0 milestone on Feb 24, 2026
  4. pthariensflame commented on Apr 3, 2026 
    @pthariensflame
    pthariensflame
    on Apr 3, 2026
    Contributor
    Wording suggestion:
    

    # Libraries
- [A faster implementation of `str::contains` that relies on SIMD](https://github.com/rust-lang/rust/pull/152176), which was already used for x86_64 with SSE2 and for LoongArch with LSX, is now also used for AArch64 with Neon.
  5. cuviper
    closed this as completedon Apr 16, 2026
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