Sep 14, 2026

Fix initialization cycle in `target_config`Rust · 120 + / 34 −

Introduces 11 new declarations in compiler/rustc_codegen_llvm/src/back/owned_mc_subtarget_info.rs.

Adds new language design rather than adjusting what was there. Tests changed with it, with code of their own.

compiler/rustc_codegen_llvm/src/back/owned_mc_subtarget_info.rs ↗ · 17 files

@@ -0,0 +1,49 @@+use std::ffi::CStr;+use std::ptr::NonNull;++use rustc_data_structures::small_c_str::SmallCStr;++use crate::diagnostics::LlvmError;+use crate::llvm;++/// Responsible for safely creating and disposing llvm::MCSubtargetInfo via ffi functions.+/// Not cloneable as there is no clone function for llvm::MCSubtargetInfo.+pub(crate) struct OwnedMCSubtargetInfo {+    info_unique: NonNull<llvm::MCSubtargetInfo>,+}++impl OwnedMCSubtargetInfo {+    pub(crate) fn new(+        triple: &CStr,+        cpu: &CStr,+        features: &CStr,+    ) -> Result<Self, LlvmError<'static>> {+        // SAFETY: llvm::LLVMRustCreateMCSubtargetInfo copies pointed-to data.+        let info_ptr = unsafe {+            llvm::LLVMRustCreateMCSubtargetInfo(triple.as_ptr(), cpu.as_ptr(), features.as_ptr())+        };++        NonNull::new(info_ptr)+            .map(|info_unique| Self { info_unique })+            .ok_or_else(|| LlvmError::CreateMCSubtargetInfo { triple: SmallCStr::from(triple) })+    }++    pub(crate) fn has_feature(&self, feature: &CStr) -> bool {+        // SAFETY: `new` ensures we have a valid pointer created by+        // `llvm::LLVMRustCreateMCSubtargetInfo`.

perf_hooks: reuse buffer for uv metricsC++ · 35 + / 15 −

Reworks 33 lines of existing logic in src/node_perf.cc.

Changes how existing runtime behaves. Tests changed with it, with code of their own.

src/node_perf.cc ↗ · 6 files

@@ -265,17 +277,13 @@ void LoopIdleTime(const FunctionCallbackInfo<Value>& args) {  void UvMetricsInfo(const FunctionCallbackInfo<Value>& args) {   Environment* env = Environment::GetCurrent(args);-  Isolate* isolate = env->isolate();   uv_metrics_t metrics;   // uv_metrics_info always return 0   CHECK_EQ(uv_metrics_info(env->event_loop(), &metrics), 0);-  Local<Value> data[] = {-      Integer::New(isolate, metrics.loop_count),-      Integer::New(isolate, metrics.events),-      Integer::New(isolate, metrics.events_waiting),-  };-  Local<Array> arr = Array::New(env->isolate(), data, arraysize(data));-  args.GetReturnValue().Set(arr);+  AliasedInt32Array& buffer = env->performance_state()->uv_metrics;+  buffer[0] = static_cast<int32_t>(metrics.loop_count);+  buffer[1] = static_cast<int32_t>(metrics.events);+  buffer[2] = static_cast<int32_t>(metrics.events_waiting); }  void CreateELDHistogram(const FunctionCallbackInfo<Value>& args) {

[DOM] Fix Fragment compareDocumentPosition for the root containerJavaScript · 19 + / 7 −

Introduces 1 new declaration in packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js.

Adds new language design rather than adjusting what was there. Tests changed with it, with code of their own.

packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js ↗ · 3 files

@@ -3715,13 +3716,13 @@ function validateDocumentPositionWithFiberTree(   }   if (documentPosition & Node.DOCUMENT_POSITION_CONTAINS) {     if (otherFiber === null) {-      // otherFiber could be null if its the document, documentElement, or body-      const ownerDocument = getOwnerDocumentFromRootContainer(otherNode);-      return (-        (otherNode as Instance | Document) === ownerDocument ||-        otherNode === ownerDocument.documentElement ||-        otherNode === ownerDocument.body-      );+      // otherFiber is null when otherNode is not part of a React tree. That+      // includes the document, documentElement and body, but also the root+      // container and any element above it. All of them contain the whole+      // React tree, so check containment of the root container rather than+      // enumerating the nodes above it.+      const rootContainer = getFragmentRootContainerInfo(fragmentFiber);+      return rootContainer !== null && otherNode.contains(rootContainer);     }     return isFragmentContainedByFiber(fragmentFiber, otherFiber);   }

Surface overlapping PRs in pr_file_map.py to ease landing PRsPython · 47 + / 15 −

Reworks 59 lines of existing logic in scripts/pr_file_map.py.

Changes how existing core implementation behaves. Read the linked PR for the surrounding test context.

scripts/pr_file_map.py ↗ · 1 files

@@ -6,16 +6,23 @@ and, for each file touched by any open PR, which PR number(s) touch it.  Output is GitHub-flavored Markdown that includes this script's path, the-current UTC datetime, and summary counts for open PRs, file entries, and-existing/missing files. It then renders a sorted list of files that currently-exist in the working directory, each with its modifying PR numbers, followed-by a separate section for files referenced by open PRs but that do not exist-in the working directory (e.g. deleted, renamed, or on a branch not checked-out locally).+current UTC datetime, and summary counts for open PRs, file touches, distinct+files, and existing/missing files. It highlights files touched by more than one+open PR first (the likely merge-conflict hot spots when landing PRs), then+renders a sorted list of files that currently exist in the working directory,+each with its modifying PR numbers, followed by a separate section for files+referenced by open PRs but that do not exist in the working directory (e.g.+deleted, renamed, or on a branch not checked out locally).++Two file totals are reported because they answer different questions:+  - "file touches" counts every (PR, file) pair, so a file edited by three open+    PRs contributes three touches; and+  - "distinct files" counts each touched path once.+Only the distinct total equals `existing + missing`, since those are deduped.  Run status is also written to stderr with:   - Number of PRs from `get_open_prs()`-  - Number of files from `get_pr_files()`+  - Number of file touches from `get_pr_files()` and distinct files touched   - Number of existing and missing files  Requirements: gh (GitHub CLI), authenticated (`gh auth login`)

fix(cli): generate valid bash completionsRust · 13 + / 4 −

Introduces 1 new declaration in libs/cli_parser/src/completions.rs.

Adds new language design rather than adjusting what was there. Read the linked PR for the surrounding test context.

libs/cli_parser/src/completions.rs ↗ · 1 files

@@ -747,6 +746,16 @@ mod tests {     assert!(v.iter().any(|f| f.starts_with("--")), "{v:?}");   } +  #[test]+  fn generate_bash_uses_real_newlines() {+    let s = String::from_utf8(generate("bash", &DENO_ROOT)).unwrap();+    assert!(+      s.contains("\"deno,run\")\n                cmd=\"deno__run\""),+      "{s}"+    );+    assert!(s.contains("            *)\n                ;;"), "{s}");+  }+   #[test]   fn generate_zsh_short_flags_keep_their_dash() {     // Regression test for #36713: the brace expansion dropped the `-` on the