Neon fast path for str::contains by JamieCunliffe · Pull Request #152176 · rust-lang/rust

JamieCunliffe · 2026-02-05T15:31:00Z

Using the SIMD friendly version of the function also gives a decent speed up with Neon.

rustbot · 2026-02-05T15:31:06Z

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jhpratt · 2026-02-07T04:37:59Z

I can't vouch for correctness.

@rustbot reroll

Mark-Simulacrum · 2026-02-08T19:45:33Z

decent speed up with Neon.

How do you know? Did we run benchmarks (can you provide the results)?

JamieCunliffe · 2026-02-10T16:02:15Z

I didn't see any benchmarks for this in tree but I did write a few quick ones, something such as:

let data = "Lorem ipsum dolor sit amet";
c.bench_function("amet", |b| b.iter(|| black_box("amet".is_contained_in(&data))));

Nightly: [41.489 ns 41.512 ns 41.534 ns]
This change: [10.610 ns 10.611 ns 10.613 ns]

Mark-Simulacrum · 2026-02-24T02:19:39Z

Seems like a reasonable result. Thanks for checking!

@bors r+

rust-bors · 2026-02-24T02:19:42Z

📌 Commit 011d95b has been approved by Mark-Simulacrum

It is now in the queue for this repository.

…=Mark-Simulacrum Neon fast path for str::contains Using the SIMD friendly version of the function also gives a decent speed up with Neon.

…uwer Rollup of 15 pull requests Successful merges: - #152176 (Neon fast path for str::contains) - #152657 (std: move `exit` out of PAL) - #152841 (Streamline `QueryVTableUnerased` into `GetQueryVTable`) - #152845 (Skip `tidy` in PR CI jobs not dedicated to running `tidy`) - #152897 (Add optional json logging) - #153009 (Remove `rustc_feedable_queries` and `define_feedable` macros.) - #151558 (Port diagnostic attributes) - #152492 (mGCA: Enforce WF element types for array valtrees) - #152888 (Fix async drop glue MIR bug) - #152988 (Port `#[register_tool]` to the new attribute system) - #153018 (`unused_must_use` lint improvements) - #153023 (Update books) - #153033 (Clarify how "ensure" queries check whether they can skip execution) - #153043 (fix error on missing value for -C flags) - #153045 (rustc-dev-guide subtree update) Failed merges: - #153032 (Fix attribute parser and kind names.)

Rollup merge of #152176 - JamieCunliffe:neon-str-contains, r=Mark-Simulacrum Neon fast path for str::contains Using the SIMD friendly version of the function also gives a decent speed up with Neon.

…uwer Rollup of 15 pull requests Successful merges: - rust-lang/rust#152176 (Neon fast path for str::contains) - rust-lang/rust#152657 (std: move `exit` out of PAL) - rust-lang/rust#152841 (Streamline `QueryVTableUnerased` into `GetQueryVTable`) - rust-lang/rust#152845 (Skip `tidy` in PR CI jobs not dedicated to running `tidy`) - rust-lang/rust#152897 (Add optional json logging) - rust-lang/rust#153009 (Remove `rustc_feedable_queries` and `define_feedable` macros.) - rust-lang/rust#151558 (Port diagnostic attributes) - rust-lang/rust#152492 (mGCA: Enforce WF element types for array valtrees) - rust-lang/rust#152888 (Fix async drop glue MIR bug) - rust-lang/rust#152988 (Port `#[register_tool]` to the new attribute system) - rust-lang/rust#153018 (`unused_must_use` lint improvements) - rust-lang/rust#153023 (Update books) - rust-lang/rust#153033 (Clarify how "ensure" queries check whether they can skip execution) - rust-lang/rust#153043 (fix error on missing value for -C flags) - rust-lang/rust#153045 (rustc-dev-guide subtree update) Failed merges: - rust-lang/rust#153032 (Fix attribute parser and kind names.)

Pkgsrc changes: * Update version & checksums, and adapt to new libc crate included. Upstream changes relative to 1.94.1: Version 1.95 (2026-04-16) ========================== Language -------- - [Stabilize `if let` guards on match arms] (rust-lang/rust#141295) - [`irrefutable_let_patterns` lint no longer lints on let chains] (rust-lang/rust#146832) - [Support importing path-segment keywords with renaming] (rust-lang/rust#146972) - [Stabilize inline assembly for PowerPC and PowerPC64] (rust-lang/rust#147996) - [const-eval: be more consistent in the behavior of padding during typed copies] (rust-lang/rust#148967) - [Const blocks are no longer evaluated to determine if expressions involving fallible operations can implicitly be constant-promoted.] (rust-lang/rust#150557). Expressions whose ability to implicitly be promoted would depend on the result of a const block are no longer implicitly promoted. - [Make operational semantics of pattern matching independent of crate and module] (rust-lang/rust#150681) Compiler -------- - [Stabilize `--remap-path-scope` for controlling the scoping of how paths get remapped in the resulting binary] (rust-lang/rust#147611) Platform Support ---------------- - [Promote `powerpc64-unknown-linux-musl` to Tier 2 with host tools] (rust-lang/rust#149962) - [Promote `aarch64-apple-tvos` to Tier 2] (rust-lang/rust#152021) - [Promote `aarch64-apple-tvos-sim` to Tier 2] (rust-lang/rust#152021) - [Promote `aarch64-apple-watchos` to Tier 2] (rust-lang/rust#152021) - [Promote `aarch64-apple-watchos-sim` to Tier 2] (rust-lang/rust#152021) - [Promote `aarch64-apple-visionos` to Tier 2] (rust-lang/rust#152021) - [Promote `aarch64-apple-visionos-sim` to Tier 2] (rust-lang/rust#152021) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. https://doc.rust-lang.org/rustc/platform-support.html Libraries --------- - [`thread::scope`: document how join interacts with TLS destructors] (rust-lang/rust#149482) - [Speed up `str::contains` on aarch64 targets with `neon` target feature enabled by default] (rust-lang/rust#152176) Stabilized APIs --------------- - [`MaybeUninit<[T; N]>: From<[MaybeUninit<T>; N]>`] (https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-From%3CMaybeUninit%3C%5BT;+N%5D%3E%3E-for-%5BMaybeUninit%3CT%3E;+N%5D) - [`MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>; N]>`] (https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsRef%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>]>`] (https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsRef%3C%5BMaybeUninit%3CT%3E%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>; N]>`] (https://doc.rust-lang.org/beta/std/mem/union.MaybeUninit.html#impl-AsMut%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>]>`] (https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsMut%3C%5BMaybeUninit%3CT%3E%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`[MaybeUninit<T>; N]: From<MaybeUninit<[T; N]>>`] (https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-From%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`Cell<[T; N]>: AsRef<[Cell<T>; N]>`] (https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E;+N%5D%3E-for-Cell%3C%5BT;+N%5D%3E) - [`Cell<[T; N]>: AsRef<[Cell<T>]>`] (https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E%5D%3E-for-Cell%3C%5BT;+N%5D%3E) - [`Cell<[T]>: AsRef<[Cell<T>]>`] (https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E%5D%3E-for-Cell%3C%5BT%5D%3E) - [`bool: TryFrom<{integer}>`] (https://doc.rust-lang.org/stable/std/primitive.bool.html#impl-TryFrom%3Cu128%3E-for-bool) - [`AtomicPtr::update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.update) - [`AtomicPtr::try_update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.try_update) - [`AtomicBool::update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicBool.html#method.update) - [`AtomicBool::try_update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicBool.html#method.try_update) - [`AtomicIn::update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicIsize.html#method.update) - [`AtomicIn::try_update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicIsize.html#method.try_update) - [`AtomicUn::update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicUsize.html#method.update) - [`AtomicUn::try_update`] (https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicUsize.html#method.try_update) - [`cfg_select!`] (https://doc.rust-lang.org/stable/std/macro.cfg_select.html) - [`mod core::range`] (https://doc.rust-lang.org/stable/core/range/index.html) - [`core::range::RangeInclusive`] (https://doc.rust-lang.org/stable/core/range/struct.RangeInclusive.html) - [`core::range::RangeInclusiveIter`] (https://doc.rust-lang.org/stable/core/range/struct.RangeInclusiveIter.html) - [`core::hint::cold_path`] (https://doc.rust-lang.org/stable/core/hint/fn.cold_path.html) - [`<*const T>::as_ref_unchecked`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_ref_unchecked) - [`<*mut T>::as_ref_unchecked`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_ref_unchecked-1) - [`<*mut T>::as_mut_unchecked`] (https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_mut_unchecked) These previously stable APIs are now stable in const contexts: - [`fmt::from_fn`] (https://doc.rust-lang.org/stable/std/fmt/fn.from_fn.html) - [`ControlFlow::is_break`] (https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.is_break) - [`ControlFlow::is_continue`] (https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.is_continue) Cargo ----- - [docs(report): enhance man pages for `cargo report *`] (rust-lang/cargo#16430) Rustdoc ----- - [In search results, rank unstable items lower] (rust-lang/rust#149460) - [Add new "hide deprecated items" setting in rustdoc] (rust-lang/rust#151091) Compatibility Notes ------------------- - [Array coercions may now result in less inference constraints than before] (rust-lang/rust#140283) - Importing `$crate` without renaming, i.e. `use $crate::{self};`, is now no longer permitted due to stricter error checking for `self` imports. - [const-eval: be more consistent in the behavior of padding during typed copies.] (rust-lang/rust#148967) In very rare cases, this may cause compilation errors due to bytes from parts of a pointer ending up in the padding bytes of a `const` or `static`. - [A future-incompatibility warning lint `ambiguous_glob_imported_traits` is now reported when using an ambiguously glob imported trait] (rust-lang/rust#149058) - [Check lifetime bounds of types mentioning only type parameters] (rust-lang/rust#149389) - [Report more visibility-related ambiguous import errors] (rust-lang/rust#149596) - [Deprecate `Eq::assert_receiver_is_total_eq` and emit future compatibility warnings on manual impls] (rust-lang/rust#149978) - [powerpc64: Use the ELF ABI version set in target spec instead of guessing] (rust-lang/rust#150468) (fixes the ELF ABI used by the OpenBSD target) - Matching on a `#[non_exhaustive]` enum [now reads the discriminant, even if the enum has only one variant] (rust-lang/rust#150681). This can cause closures to capture values that they previously wouldn't. - `mut ref` and `mut ref mut` patterns, part of the unstable [Match Ergonomics 2024 RFC] (rust-lang/rust#123076), were accidentally allowed on stable within struct pattern field shorthand. These patterns are now correctly feature-gated as unstable in this position. - [Add future-compatibility warning for derive helper attributes which conflict with built-in attributes] (rust-lang/rust#151152) - [JSON target specs] (https://doc.rust-lang.org/rustc/targets/custom.html) have been destabilized and now require `-Z unstable-options` to use. Previously, they could not be used without the standard library, which has no stable build mechanism. In preparation for the `build-std` project adding that support, JSON target specs are being proactively gated to ensure they remain unstable even if `build-std` is stabilized. Cargo now includes the `-Z json-target-spec` CLI flag to automatically pass `-Z unstable-options` to the compiler when needed. See [#150151] (rust-lang/rust#150151), [#151534] (rust-lang/rust#150151), and [rust-lang/cargo#16557] (rust-lang/cargo#16557). - [The arguments of `#[feature]` attributes on invalid targets are now checked] (rust-lang/rust#153764) Internal Changes ---------------- These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 22](rust-lang/rust#150722)

This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [rust](https://github.com/rust-lang/rust) | | minor | `1.94.0` → `1.95.0` | | rust | stage | minor | `1.94-bookworm` → `1.95-bookworm` | --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.95.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1950-2026-04-16) [Compare Source](rust-lang/rust@1.94.1...1.95.0) \=========================== <a id="1.95-Language"></a> ## Language - [Stabilize `if let` guards on match arms](rust-lang/rust#141295) - [`irrefutable_let_patterns` lint no longer lints on let chains](rust-lang/rust#146832) - [Support importing path-segment keywords with renaming](rust-lang/rust#146972) - [Stabilize inline assembly for PowerPC and PowerPC64](rust-lang/rust#147996) - [const-eval: be more consistent in the behavior of padding during typed copies](rust-lang/rust#148967) - [Const blocks are no longer evaluated to determine if expressions involving fallible operations can implicitly be constant-promoted.](rust-lang/rust#150557). Expressions whose ability to implicitly be promoted would depend on the result of a const block are no longer implicitly promoted. - [Make operational semantics of pattern matching independent of crate and module](rust-lang/rust#150681) <a id="1.95-Compiler"></a> ## Compiler - [Stabilize `--remap-path-scope` for controlling the scoping of how paths get remapped in the resulting binary](rust-lang/rust#147611) - [Apply patches for CVE-2026-6042 and CVE-2026-40200 to vendored musl](rust-lang/rust#155171) <a id="1.95-Platform-Support"></a> ## Platform Support - [Promote `powerpc64-unknown-linux-musl` to Tier 2 with host tools](rust-lang/rust#149962) - [Promote `aarch64-apple-tvos` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-tvos-sim` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-watchos` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-watchos-sim` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-visionos` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-visionos-sim` to Tier 2](rust-lang/rust#152021) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html <a id="1.95-Libraries"></a> ## Libraries - [`thread::scope`: document how join interacts with TLS destructors](rust-lang/rust#149482) - [Speed up `str::contains` on aarch64 targets with `neon` target feature enabled by default](rust-lang/rust#152176) <a id="1.95-Stabilized-APIs"></a> ## Stabilized APIs - [`MaybeUninit<[T; N]>: From<[MaybeUninit<T>; N]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-From%3CMaybeUninit%3C%5BT;+N%5D%3E%3E-for-%5BMaybeUninit%3CT%3E;+N%5D) - [`MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>; N]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsRef%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsRef%3C%5BMaybeUninit%3CT%3E%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>; N]>`](https://doc.rust-lang.org/beta/std/mem/union.MaybeUninit.html#impl-AsMut%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsMut%3C%5BMaybeUninit%3CT%3E%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`[MaybeUninit<T>; N]: From<MaybeUninit<[T; N]>>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-From%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`Cell<[T; N]>: AsRef<[Cell<T>; N]>`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E;+N%5D%3E-for-Cell%3C%5BT;+N%5D%3E) - [`Cell<[T; N]>: AsRef<[Cell<T>]>`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E%5D%3E-for-Cell%3C%5BT;+N%5D%3E) - [`Cell<[T]>: AsRef<[Cell<T>]>`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E%5D%3E-for-Cell%3C%5BT%5D%3E) - [`bool: TryFrom<{integer}>`](https://doc.rust-lang.org/stable/std/primitive.bool.html#impl-TryFrom%3Cu128%3E-for-bool) - [`AtomicPtr::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.update) - [`AtomicPtr::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.try_update) - [`AtomicBool::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicBool.html#method.update) - [`AtomicBool::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicBool.html#method.try_update) - [`AtomicIn::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicIsize.html#method.update) - [`AtomicIn::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicIsize.html#method.try_update) - [`AtomicUn::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicUsize.html#method.update) - [`AtomicUn::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicUsize.html#method.try_update) - [`cfg_select!`](https://doc.rust-lang.org/stable/std/macro.cfg_select.html) - [`mod core::range`](https://doc.rust-lang.org/stable/core/range/index.html) - [`core::range::RangeInclusive`](https://doc.rust-lang.org/stable/core/range/struct.RangeInclusive.html) - [`core::range::RangeInclusiveIter`](https://doc.rust-lang.org/stable/core/range/struct.RangeInclusiveIter.html) - [`core::hint::cold_path`](https://doc.rust-lang.org/stable/core/hint/fn.cold_path.html) - [`<*const T>::as_ref_unchecked`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_ref_unchecked) - [`<*mut T>::as_ref_unchecked`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_ref_unchecked-1) - [`<*mut T>::as_mut_unchecked`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_mut_unchecked) - [`Vec::push_mut`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.push_mut) - [`Vec::insert_mut`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.insert_mut) - [`VecDeque::push_front_mut`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.push_front_mut) - [`VecDeque::push_back_mut`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.push_back_mut) - [`VecDeque::insert_mut`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.insert_mut) - [`LinkedList::push_front_mut`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.push_front_mut) - [`LinkedList::push_back_mut`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.push_back_mut) - [`Layout::dangling_ptr`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.dangling_ptr) - [`Layout::repeat`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.repeat) - [`Layout::repeat_packed`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.repeat_packed) - [`Layout::extend_packed`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.extend_packed) These previously stable APIs are now stable in const contexts: - [`fmt::from_fn`](https://doc.rust-lang.org/stable/std/fmt/fn.from_fn.html) - [`ControlFlow::is_break`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.is_break) - [`ControlFlow::is_continue`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.is_continue) <a id="1.95-Rustdoc"></a> ## Rustdoc - [In search results, rank unstable items lower](rust-lang/rust#149460) - [Add new "hide deprecated items" setting in rustdoc](rust-lang/rust#151091) <a id="1.95-Compatibility-Notes"></a> ## Compatibility Notes - [Array coercions may now result in less inference constraints than before](rust-lang/rust#140283) - Importing `$crate` without renaming, i.e. `use $crate::{self};`, is now no longer permitted due to stricter error checking for `self` imports. - [const-eval: be more consistent in the behavior of padding during typed copies.](rust-lang/rust#148967) In very rare cases, this may cause compilation errors due to bytes from parts of a pointer ending up in the padding bytes of a `const` or `static`. - [A future-incompatibility warning lint `ambiguous_glob_imported_traits` is now reported when using an ambiguously glob imported trait](rust-lang/rust#149058) - [Check lifetime bounds of types mentioning only type parameters](rust-lang/rust#149389) - [Report more visibility-related ambiguous import errors](rust-lang/rust#149596) - [Deprecate `Eq::assert_receiver_is_total_eq` and emit future compatibility warnings on manual impls](rust-lang/rust#149978) - [powerpc64: Use the ELF ABI version set in target spec instead of guessing](rust-lang/rust#150468) (fixes the ELF ABI used by the OpenBSD target) - Matching on a `#[non_exhaustive]` enum [now reads the discriminant, even if the enum has only one variant](rust-lang/rust#150681). This can cause closures to capture values that they previously wouldn't. - `mut ref` and `mut ref mut` patterns, part of the unstable [Match Ergonomics 2024 RFC](rust-lang/rust#123076), were accidentally allowed on stable within struct pattern field shorthand. These patterns are now correctly feature-gated as unstable in this position. - [Add future-compatibility warning for derive helper attributes which conflict with built-in attributes](rust-lang/rust#151152) - [JSON target specs](https://doc.rust-lang.org/rustc/targets/custom.html) have been destabilized and now require `-Z unstable-options` to use. Previously, they could not be used without the standard library, which has no stable build mechanism. In preparation for the `build-std` project adding that support, JSON target specs are being proactively gated to ensure they remain unstable even if `build-std` is stabilized. Cargo now includes the `-Z json-target-spec` CLI flag to automatically pass `-Z unstable-options` to the compiler when needed. See [#150151](rust-lang/rust#150151), [#151534](rust-lang/rust#150151), and [rust-lang/cargo#16557](rust-lang/cargo#16557). - [The arguments of `#[feature]` attributes on invalid targets are now checked](rust-lang/rust#153764) <a id="1.95-Internal-Changes"></a> ## Internal Changes These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 22](rust-lang/rust#150722) ### [`v1.94.1`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1941-2026-03-26) [Compare Source](rust-lang/rust@1.94.0...1.94.1) \=========================== <a id="1.94.1"></a> - [Fix `std::thread::spawn` on wasm32-wasip1-threads](rust-lang/rust#153634) - [Remove new methods added to `std::os::windows::fs::OpenOptionsExt`](rust-lang/rust#153491) The new methods were unstable, but the trait itself is not sealed and so cannot be extended with non-default methods. - [Clippy: fix ICE in `match_same_arms`](rust-lang/rust-clippy#16685) - [Cargo: update tar to 0.4.45](rust-lang/cargo#16769) This resolves CVE-2026-33055 and CVE-2026-33056. Users of crates.io are not affected. See [blog](https://blog.rust-lang.org/2026/03/21/cve-2026-33056/) for more details. </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.erwanleboucher.dev/eleboucher/towonel/pulls/4

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.94.1` → `1.95.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.95.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1950-2026-04-16) [Compare Source](rust-lang/rust@1.94.1...1.95.0) \=========================== <a id="1.95-Language"></a> ## Language - [Stabilize `if let` guards on match arms](rust-lang/rust#141295) - [`irrefutable_let_patterns` lint no longer lints on let chains](rust-lang/rust#146832) - [Support importing path-segment keywords with renaming](rust-lang/rust#146972) - [Stabilize inline assembly for PowerPC and PowerPC64](rust-lang/rust#147996) - [const-eval: be more consistent in the behavior of padding during typed copies](rust-lang/rust#148967) - [Const blocks are no longer evaluated to determine if expressions involving fallible operations can implicitly be constant-promoted.](rust-lang/rust#150557). Expressions whose ability to implicitly be promoted would depend on the result of a const block are no longer implicitly promoted. - [Make operational semantics of pattern matching independent of crate and module](rust-lang/rust#150681) <a id="1.95-Compiler"></a> ## Compiler - [Stabilize `--remap-path-scope` for controlling the scoping of how paths get remapped in the resulting binary](rust-lang/rust#147611) - [Apply patches for CVE-2026-6042 and CVE-2026-40200 to vendored musl](rust-lang/rust#155171) <a id="1.95-Platform-Support"></a> ## Platform Support - [Promote `powerpc64-unknown-linux-musl` to Tier 2 with host tools](rust-lang/rust#149962) - [Promote `aarch64-apple-tvos` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-tvos-sim` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-watchos` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-watchos-sim` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-visionos` to Tier 2](rust-lang/rust#152021) - [Promote `aarch64-apple-visionos-sim` to Tier 2](rust-lang/rust#152021) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html <a id="1.95-Libraries"></a> ## Libraries - [`thread::scope`: document how join interacts with TLS destructors](rust-lang/rust#149482) - [Speed up `str::contains` on aarch64 targets with `neon` target feature enabled by default](rust-lang/rust#152176) <a id="1.95-Stabilized-APIs"></a> ## Stabilized APIs - [`MaybeUninit<[T; N]>: From<[MaybeUninit<T>; N]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-From%3CMaybeUninit%3C%5BT;+N%5D%3E%3E-for-%5BMaybeUninit%3CT%3E;+N%5D) - [`MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>; N]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsRef%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsRef<[MaybeUninit<T>]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsRef%3C%5BMaybeUninit%3CT%3E%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>; N]>`](https://doc.rust-lang.org/beta/std/mem/union.MaybeUninit.html#impl-AsMut%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`MaybeUninit<[T; N]>: AsMut<[MaybeUninit<T>]>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-AsMut%3C%5BMaybeUninit%3CT%3E%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`[MaybeUninit<T>; N]: From<MaybeUninit<[T; N]>>`](https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#impl-From%3C%5BMaybeUninit%3CT%3E;+N%5D%3E-for-MaybeUninit%3C%5BT;+N%5D%3E) - [`Cell<[T; N]>: AsRef<[Cell<T>; N]>`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E;+N%5D%3E-for-Cell%3C%5BT;+N%5D%3E) - [`Cell<[T; N]>: AsRef<[Cell<T>]>`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E%5D%3E-for-Cell%3C%5BT;+N%5D%3E) - [`Cell<[T]>: AsRef<[Cell<T>]>`](https://doc.rust-lang.org/stable/std/cell/struct.Cell.html#impl-AsRef%3C%5BCell%3CT%3E%5D%3E-for-Cell%3C%5BT%5D%3E) - [`bool: TryFrom<{integer}>`](https://doc.rust-lang.org/stable/std/primitive.bool.html#impl-TryFrom%3Cu128%3E-for-bool) - [`AtomicPtr::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.update) - [`AtomicPtr::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicPtr.html#method.try_update) - [`AtomicBool::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicBool.html#method.update) - [`AtomicBool::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicBool.html#method.try_update) - [`AtomicIn::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicIsize.html#method.update) - [`AtomicIn::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicIsize.html#method.try_update) - [`AtomicUn::update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicUsize.html#method.update) - [`AtomicUn::try_update`](https://doc.rust-lang.org/stable/std/sync/atomic/struct.AtomicUsize.html#method.try_update) - [`cfg_select!`](https://doc.rust-lang.org/stable/std/macro.cfg_select.html) - [`mod core::range`](https://doc.rust-lang.org/stable/core/range/index.html) - [`core::range::RangeInclusive`](https://doc.rust-lang.org/stable/core/range/struct.RangeInclusive.html) - [`core::range::RangeInclusiveIter`](https://doc.rust-lang.org/stable/core/range/struct.RangeInclusiveIter.html) - [`core::hint::cold_path`](https://doc.rust-lang.org/stable/core/hint/fn.cold_path.html) - [`<*const T>::as_ref_unchecked`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_ref_unchecked) - [`<*mut T>::as_ref_unchecked`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_ref_unchecked-1) - [`<*mut T>::as_mut_unchecked`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.as_mut_unchecked) - [`Vec::push_mut`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.push_mut) - [`Vec::insert_mut`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.insert_mut) - [`VecDeque::push_front_mut`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.push_front_mut) - [`VecDeque::push_back_mut`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.push_back_mut) - [`VecDeque::insert_mut`](https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.insert_mut) - [`LinkedList::push_front_mut`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.push_front_mut) - [`LinkedList::push_back_mut`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.push_back_mut) - [`Layout::dangling_ptr`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.dangling_ptr) - [`Layout::repeat`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.repeat) - [`Layout::repeat_packed`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.repeat_packed) - [`Layout::extend_packed`](https://doc.rust-lang.org/stable/std/alloc/struct.Layout.html#method.extend_packed) These previously stable APIs are now stable in const contexts: - [`fmt::from_fn`](https://doc.rust-lang.org/stable/std/fmt/fn.from_fn.html) - [`ControlFlow::is_break`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.is_break) - [`ControlFlow::is_continue`](https://doc.rust-lang.org/stable/core/ops/enum.ControlFlow.html#method.is_continue) <a id="1.95-Rustdoc"></a> ## Rustdoc - [In search results, rank unstable items lower](rust-lang/rust#149460) - [Add new "hide deprecated items" setting in rustdoc](rust-lang/rust#151091) <a id="1.95-Compatibility-Notes"></a> ## Compatibility Notes - [Array coercions may now result in less inference constraints than before](rust-lang/rust#140283) - Importing `$crate` without renaming, i.e. `use $crate::{self};`, is now no longer permitted due to stricter error checking for `self` imports. - [const-eval: be more consistent in the behavior of padding during typed copies.](rust-lang/rust#148967) In very rare cases, this may cause compilation errors due to bytes from parts of a pointer ending up in the padding bytes of a `const` or `static`. - [A future-incompatibility warning lint `ambiguous_glob_imported_traits` is now reported when using an ambiguously glob imported trait](rust-lang/rust#149058) - [Check lifetime bounds of types mentioning only type parameters](rust-lang/rust#149389) - [Report more visibility-related ambiguous import errors](rust-lang/rust#149596) - [Deprecate `Eq::assert_receiver_is_total_eq` and emit future compatibility warnings on manual impls](rust-lang/rust#149978) - [powerpc64: Use the ELF ABI version set in target spec instead of guessing](rust-lang/rust#150468) (fixes the ELF ABI used by the OpenBSD target) - Matching on a `#[non_exhaustive]` enum [now reads the discriminant, even if the enum has only one variant](rust-lang/rust#150681). This can cause closures to capture values that they previously wouldn't. - `mut ref` and `mut ref mut` patterns, part of the unstable [Match Ergonomics 2024 RFC](rust-lang/rust#123076), were accidentally allowed on stable within struct pattern field shorthand. These patterns are now correctly feature-gated as unstable in this position. - [Add future-compatibility warning for derive helper attributes which conflict with built-in attributes](rust-lang/rust#151152) - [JSON target specs](https://doc.rust-lang.org/rustc/targets/custom.html) have been destabilized and now require `-Z unstable-options` to use. Previously, they could not be used without the standard library, which has no stable build mechanism. In preparation for the `build-std` project adding that support, JSON target specs are being proactively gated to ensure they remain unstable even if `build-std` is stabilized. Cargo now includes the `-Z json-target-spec` CLI flag to automatically pass `-Z unstable-options` to the compiler when needed. See [#150151](rust-lang/rust#150151), [#151534](rust-lang/rust#150151), and [rust-lang/cargo#16557](rust-lang/cargo#16557). - [The arguments of `#[feature]` attributes on invalid targets are now checked](rust-lang/rust#153764) <a id="1.95-Internal-Changes"></a> ## Internal Changes These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 22](rust-lang/rust#150722) </details> --- ### Configuration 📅 **Schedule**: (UTC) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Neon fast path for str::contains
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rustbot assigned jhpratt Feb 5, 2026

rustbot added 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 Feb 5, 2026

rustbot assigned Mark-Simulacrum and unassigned jhpratt Feb 7, 2026

Mark-Simulacrum 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 Feb 8, 2026

davidtwco 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 Feb 23, 2026

Mark-Simulacrum added the relnotes-perf Performance improvements that should be mentioned in the release notes. label Feb 24, 2026

rustbot mentioned this pull request Feb 24, 2026
Tracking issue for release notes of #152176: Neon fast path for str::contains #153031
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rust-borsBot 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 Feb 24, 2026

JonathanBrouwer mentioned this pull request Feb 24, 2026
Rollup of 9 pull requests #153042
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This was referenced Feb 24, 2026
Rollup of 9 pull requests #153044
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Rollup of 15 pull requests #153047
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rust-borsBot merged commit 9f242b1 into rust-lang:mainFeb 24, 2026
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rustbot added this to the 1.95.0 milestone Feb 24, 2026

BoxyUwU mentioned this pull request Apr 2, 2026
Draft release notes for 1.95 #154711
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Neon fast path for str::contains - #152176

Neon fast path for str::contains#152176
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