Fix ICE in `match_same_arms` by samueltardieu · Pull Request #16685 · rust-lang/rust-clippy

samueltardieu · 2026-03-07T19:15:51Z

The wrong TypeckResults was used in the fallback equality function passed by the match_same_arms and filter_map lints. Previously, those fallback functions had no way of using the proper TypeckResults. Those (one per expression being compared) are now passed to the registered fallback function.

changelog: [match_same_arms]: fix internal compiler error

Fixes #16678
Fixes #16686

Summary Notes

Beta nomination by samueltardieu

Managed by @rustbot—see help for details

The wrong `TypeckResults` was used in the fallback equality function passed by the `match_same_arms` and `filter_map` lints. Previously, those fallback functions had no way of using the proper `TypeckResults`. Those (one per expression being compared) are now passed to the registered fallback function.

rustbot · 2026-03-07T19:15:56Z

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samueltardieu · 2026-03-07T19:17:25Z

@rustbot label beta-nominated
@rustbot note Beta nomination

This is a regression from stable (1.93.1) to stable (1.94.0). This should be propagated to the beta branch for Rust 1.95.0. This should also probably be included if a 1.94.1 point release is made.

Jarcho

Thank you.

View changes since this review

This applies the patch for that PR, fixing an ICE in match_same_arms.

[stable] 1.94.1 release This backports: * [STABLE] library: wasm32-wasip1-threads has functional pthreads #153634 * Move freeze_* methods to OpenOptionsExt2 #153491 * [Clippy] Fix ICE in match_same_arms rust-lang/rust-clippy#16685 Cargo: * [stable 1.94] Fix symlink_and_directory when running in a long target dir name (rust-lang/cargo#16777) * Fix symlink_and_directory when running in a long target dir name (rust-lang/cargo#16775) * [stable 1.94] Update tar to 0.4.45 (rust-lang/cargo#16769) * test: Remove unused docker ip_address (rust-lang/cargo#16636) * Increase cache_lock test timeout (rust-lang/cargo#16545) * chore: Updated compiler errors for Rust 1.93 (rust-lang/cargo#16543) * test(build-std): Update error message (rust-lang/cargo#16658) * fix: `--remap-path-scope` stabilized in 1.95-nightly (rust-lang/cargo#16536) * fix(script): surpress `unused_features` lint for embedded (rust-lang/cargo#16714) * test(git): Mark a test as non-deterministic (rust-lang/cargo#16706) * test(replace): Mark a test as non-deterministic (rust-lang/cargo#16700)

From the [blog post](https://blog.rust-lang.org/2026/03/26/1.94.1-release/) ## What's in 1.94.1 Rust 1.94.1 resolves three regressions that were introduced in the 1.94.0 release. - [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: downgrade curl-sys to 0.4.83](rust-lang/cargo#16787) This fixes certificate validation error for some users on some versions of FreeBSD. See [this issue](rust-lang/cargo#16357) for more details. And a security fix: - [Cargo: Update tar to 0.4.45](rust-lang/cargo#16769) This resolves [CVE-2026-33055](https://www.cve.org/CVERecord?id=CVE-2026-33055) and [CVE-2026-33056](https://www.cve.org/CVERecord?id=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.

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | patch | `1.94.0` → `1.94.1` | 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> ### [`v1.94.1`](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**: Enabled. ♻ **Rebasing**: Whenever MR is behind base branch, 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).

This PR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | patch | `1.94.0` → `1.94.1` | --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`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 - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) in timezone Pacific/Auckland, Automerge - Between 12:00 AM and 03:59 AM ( * 0-3 * * * ) in timezone Pacific/Auckland. 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever PR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] 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://harton.dev/project-neon/neonfs/pulls/86 Co-authored-by: Renovate Bot <bot@harton.nz> Co-committed-by: Renovate Bot <bot@harton.nz>

flip1995 · 2026-04-09T16:12:44Z

rust-lang/rust#155051

The wrong `TypeckResults` was used in the fallback equality function passed by the `match_same_arms` and `filter_map` lints. Previously, those fallback functions had no way of using the proper `TypeckResults`. Those (one per expression being compared) are now passed to the registered fallback function. changelog: [`match_same_arms`]: fix internal compiler error Fixes rust-lang/rust-clippy#16678 Fixes rust-lang/rust-clippy#16686   ### Summary Notes - [Beta nomination](rust-lang/rust-clippy#16685 (comment)) by [samueltardieu](https://github.com/samueltardieu) *Managed by `@rustbot`—see [help](https://forge.rust-lang.org/triagebot/note.html) for details*

[beta] reverts and backports This reverts two `dbg!` changes to avoid regressions[^1][^2] in the upcoming 1.95 release: - std: avoid tearing `dbg!` prints #149869 - don't drop arguments' temporaries in `dbg!` #154074 - ... which was previously backported in #154725 This also reverts a stabilization over a late issue[^3] of semantics: - Stabilize `assert_matches` #137487 And a few other backport/reverts from `main`: - Revert performing basic const checks in typeck on stable #154930 / #155033 - Revert "`-Znext-solver` Remove the forced ambiguity hack from search graph" #154712 - Clarify that core::range ranges do not have special syntax #155002 Clippy is backporting 2 ICE fixes and 1 perf regression (via #155051): - rust-lang/rust-clippy#16685 already backported in #154211 to stable. This makes sure that it doesn't regress again in beta/next stable - rust-lang/rust-clippy#16659 The ICE that is being fixed here was introduced in the 1.95 release cycle - rust-lang/rust-clippy#16652 Perf regression introduced in the 1.95 release cycle. [^1]: #153850 [^2]: #154988 [^3]: #154406

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

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Mar 7, 2026

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rustbot added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Mar 7, 2026

samueltardieu mentioned this pull request Mar 7, 2026

(expr sub_reader) cannot be placed in TypeckResults #16686

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Merged via the queue into rust-lang:master with commit 9450d56 Mar 7, 2026
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rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Mar 7, 2026

samueltardieu deleted the issues/16678 branch March 8, 2026 07:26

Mark-Simulacrum added a commit to Mark-Simulacrum/rust that referenced this pull request Mar 22, 2026

Backport rust-lang/rust-clippy#16685

96a4ac8

This applies the patch for that PR, fixing an ICE in match_same_arms.

Mark-Simulacrum mentioned this pull request Mar 22, 2026

[stable] 1.94.1 release rust-lang/rust#154211

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CleanCut mentioned this pull request Mar 26, 2026

Bump to Rust 1.94.1 Oxen-AI/Oxen#384

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flip1995 added beta-accepted Accepted for backporting to the compiler in the beta channel. and removed beta-nominated Nominated for backporting to the compiler in the beta channel. labels Apr 9, 2026

flip1995 mentioned this pull request Apr 9, 2026

[beta] Clippy backport rust-lang/rust#155051

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cuviper mentioned this pull request Apr 9, 2026

[beta] reverts and backports rust-lang/rust#154999

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Fix ICE in `match_same_arms`#16685

Fix ICE in `match_same_arms`#16685
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