Rollup of 9 pull requests

RELEASES.md

@@ -1,3 +1,126 @@
+Version 1.86.0 (2025-04-03)
+==========================
+
+<a id="1.86.0-Language"></a>
+
+Language
+--------
+- [Stabilize upcasting trait objects to supertraits.](https://github.com/rust-lang/rust/pull/134367)
+- [Allow safe functions to be marked with the `#[target_feature]` attribute.](https://github.com/rust-lang/rust/pull/134090)
+- [The `missing_abi` lint now warns-by-default.](https://github.com/rust-lang/rust/pull/132397)
+- Rust now lints about double negations, to catch cases that might have intended to be a prefix decrement operator (`--x`) as written in other languages. This was previously a clippy lint, `clippy::double_neg`, and is [now available directly in Rust as `double_negations`.](https://github.com/rust-lang/rust/pull/126604)
+- [More pointers are now detected as definitely not-null based on their alignment in const eval.](https://github.com/rust-lang/rust/pull/133700)
+- [Empty `repr()` attribute applied to invalid items are now correctly rejected.](https://github.com/rust-lang/rust/pull/133925)
+- [Inner attributes `#![test]` and `#![rustfmt::skip]` are no longer accepted in more places than intended.](https://github.com/rust-lang/rust/pull/134276)
+
+<a id="1.86.0-Compiler"></a>
+
+Compiler
+--------
+- [Debug-assert that raw pointers are non-null on access.](https://github.com/rust-lang/rust/pull/134424)
+- [Change `-O` to mean `-C opt-level=3` instead of `-C opt-level=2` to match Cargo's defaults.](https://github.com/rust-lang/rust/pull/135439)
+- [Fix emission of `overflowing_literals` under certain macro environments.](https://github.com/rust-lang/rust/pull/136393)
+
+<a id="1.86.0-Platform-Support"></a>
+
+Platform Support
+----------------
+- [Replace `i686-unknown-redox` target with `i586-unknown-redox`.](https://github.com/rust-lang/rust/pull/136698)
+- [Increase baseline CPU of `i686-unknown-hurd-gnu` to Pentium 4.](https://github.com/rust-lang/rust/pull/136700)
+- New tier 3 targets:
+  - [`{aarch64-unknown,x86_64-pc}-nto-qnx710_iosock`](https://github.com/rust-lang/rust/pull/133631).
+    For supporting Neutrino QNX 7.1 with `io-socket` network stack.
+  - [`{aarch64-unknown,x86_64-pc}-nto-qnx800`](https://github.com/rust-lang/rust/pull/133631).
+    For supporting Neutrino QNX 8.0 (`no_std`-only).
+  - [`{x86_64,i686}-win7-windows-gnu`](https://github.com/rust-lang/rust/pull/134609).
+    Intended for backwards compatibility with Windows 7. `{x86_64,i686}-win7-windows-msvc` are the Windows MSVC counterparts that already exist as Tier 3 targets.
+  - [`amdgcn-amd-amdhsa`](https://github.com/rust-lang/rust/pull/134740).
+  - [`x86_64-pc-cygwin`](https://github.com/rust-lang/rust/pull/134999).
+  - [`{mips,mipsel}-mti-none-elf`](https://github.com/rust-lang/rust/pull/135074).
+    Initial bare-metal support.
+  - [`m68k-unknown-none-elf`](https://github.com/rust-lang/rust/pull/135085).
+  - [`armv7a-nuttx-{eabi,eabihf}`, `aarch64-unknown-nuttx`, and `thumbv7a-nuttx-{eabi,eabihf}`](https://github.com/rust-lang/rust/pull/135757).
+
+Refer to Rust's [platform support page][platform-support-doc]
+for more information on Rust's tiered platform support.
+
+<a id="1.86.0-Libraries"></a>
+
+Libraries
+---------
+- The type of `FromBytesWithNulError` in `CStr::from_bytes_with_nul(bytes: &[u8]) -> Result<&Self, FromBytesWithNulError>` was [changed from an opaque struct to an enum](https://github.com/rust-lang/rust/pull/134143), allowing users to examine why the conversion failed.
+- [Remove `RustcDecodable` and `RustcEncodable`.](https://github.com/rust-lang/rust/pull/134272)
+- [Deprecate libtest's `--logfile` option.](https://github.com/rust-lang/rust/pull/134283)
+- [On recent versions of Windows, `std::fs::remove_file` will now remove read-only files.](https://github.com/rust-lang/rust/pull/134679)
+
+<a id="1.86.0-Stabilized-APIs"></a>
+
+Stabilized APIs
+---------------
+
+- [`{float}::next_down`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_down)
+- [`{float}::next_up`](https://doc.rust-lang.org/stable/std/primitive.f64.html#method.next_up)
+- [`<[_]>::get_disjoint_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_mut)
+- [`<[_]>::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.get_disjoint_unchecked_mut)
+- [`slice::GetDisjointMutError`](https://doc.rust-lang.org/stable/std/slice/enum.GetDisjointMutError.html)
+- [`HashMap::get_disjoint_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_mut)
+- [`HashMap::get_disjoint_unchecked_mut`](https://doc.rust-lang.org/std/collections/hash_map/struct.HashMap.html#method.get_disjoint_unchecked_mut)
+- [`NonZero::count_ones`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.count_ones)
+- [`Vec::pop_if`](https://doc.rust-lang.org/std/vec/struct.Vec.html#method.pop_if)
+- [`sync::Once::wait`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait)
+- [`sync::Once::wait_force`](https://doc.rust-lang.org/stable/std/sync/struct.Once.html#method.wait_force)
+- [`sync::OnceLock::wait`](https://doc.rust-lang.org/stable/std/sync/struct.OnceLock.html#method.wait)
+
+These APIs are now stable in const contexts:
+
+- [`hint::black_box`](https://doc.rust-lang.org/stable/std/hint/fn.black_box.html)
+- [`io::Cursor::get_mut`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.get_mut)
+- [`io::Cursor::set_position`](https://doc.rust-lang.org/stable/std/io/struct.Cursor.html#method.set_position)
+- [`str::is_char_boundary`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.is_char_boundary)
+- [`str::split_at`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at)
+- [`str::split_at_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_checked)
+- [`str::split_at_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut)
+- [`str::split_at_mut_checked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.split_at_mut_checked)
+
+<a id="1.86.0-Cargo"></a>
+
+Cargo
+-----
+- [When merging, replace rather than combine configuration keys that refer to a program path and its arguments.](https://github.com/rust-lang/cargo/pull/15066/)
+- [Error if both `--package` and `--workspace` are passed but the requested package is missing.](https://github.com/rust-lang/cargo/pull/15071/) This was previously silently ignored, which was considered a bug since missing packages should be reported.
+- [Deprecate the token argument in `cargo login` to avoid shell history leaks.](https://github.com/rust-lang/cargo/pull/15057/)
+- [Simplify the implementation of `SourceID` comparisons.](https://github.com/rust-lang/cargo/pull/14980/) This may potentially change behavior if the canonicalized URL compares differently in alternative registries.
+
+<a id="1.86.0-Rustdoc"></a>
+
+Rustdoc
+-----
+- [Add a sans-serif font setting.](https://github.com/rust-lang/rust/pull/133636)
+
+<a id="1.86.0-Compatibility-Notes"></a>
+
+Compatibility Notes
+-------------------
+- [The `wasm_c_abi` future compatibility warning is now a hard error.](https://github.com/rust-lang/rust/pull/133951)
+  Users of `wasm-bindgen` should upgrade to at least version 0.2.89, otherwise compilation will fail.
+- [Remove long-deprecated no-op attributes `#![no_start]` and `#![crate_id]`.](https://github.com/rust-lang/rust/pull/134300)
+- [The future incompatibility lint `cenum_impl_drop_cast` has been made into a hard error.](https://github.com/rust-lang/rust/pull/135964) This means it is now an error to cast a field-less enum to an integer if the enum implements `Drop`.
+- [SSE2 is now required for "i686" 32-bit x86 hard-float targets; disabling it causes a warning that will become a hard error eventually.](https://github.com/rust-lang/rust/pull/137037)
+  To compile for pre-SSE2 32-bit x86, use a "i586" target instead.
+
+<a id="1.86.0-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.
+
+- [Build the rustc on AArch64 Linux with ThinLTO + PGO.](https://github.com/rust-lang/rust/pull/133807)
+  The ARM 64-bit compiler (AArch64) on Linux is now optimized with ThinLTO and PGO, similar to the optimizations we have already performed for the x86-64 compiler on Linux. This should make it up to 30% faster.
+
+
 Version 1.85.1 (2025-03-18)
 ==========================
 

compiler/rustc_driver_impl/src/lib.rs

@@ -64,6 +64,7 @@ use rustc_session::lint::{Lint, LintId};
 use rustc_session::output::{CRATE_TYPES, collect_crate_types, invalid_output_for_target};
 use rustc_session::{EarlyDiagCtxt, Session, config, filesearch};
 use rustc_span::FileName;
+use rustc_span::def_id::LOCAL_CRATE;
 use rustc_target::json::ToJson;
 use rustc_target::spec::{Target, TargetTuple};
 use time::OffsetDateTime;
@@ -392,14 +393,10 @@ pub fn run_compiler(at_args: &[String], callbacks: &mut (dyn Callbacks + Send))
 }
 
 fn dump_feature_usage_metrics(tcxt: TyCtxt<'_>, metrics_dir: &Path) {
-    let output_filenames = tcxt.output_filenames(());
-    let mut metrics_file_name = std::ffi::OsString::from("unstable_feature_usage_metrics-");
-    let mut metrics_path = output_filenames.with_directory_and_extension(metrics_dir, "json");
-    let metrics_file_stem =
-        metrics_path.file_name().expect("there should be a valid default output filename");
-    metrics_file_name.push(metrics_file_stem);
-    metrics_path.pop();
-    metrics_path.push(metrics_file_name);
+    let hash = tcxt.crate_hash(LOCAL_CRATE);
+    let crate_name = tcxt.crate_name(LOCAL_CRATE);
+    let metrics_file_name = format!("unstable_feature_usage_metrics-{crate_name}-{hash}.json");
+    let metrics_path = metrics_dir.join(metrics_file_name);
     if let Err(error) = tcxt.features().dump_feature_usage_metrics(metrics_path) {
         // FIXME(yaahc): once metrics can be enabled by default we will want "failure to emit
         // default metrics" to only produce a warning when metrics are enabled by default and emit

compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp

@@ -855,10 +855,15 @@ extern "C" LLVMRustResult LLVMRustOptimize(
   }
 
   if (LintIR) {
-    PipelineStartEPCallbacks.push_back(
-        [](ModulePassManager &MPM, OptimizationLevel Level) {
-          MPM.addPass(createModuleToFunctionPassAdaptor(LintPass()));
-        });
+    PipelineStartEPCallbacks.push_back([](ModulePassManager &MPM,
+                                          OptimizationLevel Level) {
+#if LLVM_VERSION_GE(21, 0)
+      MPM.addPass(
+          createModuleToFunctionPassAdaptor(LintPass(/*AbortOnError=*/true)));
+#else
+      MPM.addPass(createModuleToFunctionPassAdaptor(LintPass()));
+#endif
+    });
   }
 
   if (InstrumentCoverage) {

compiler/rustc_middle/src/ty/consts/valtree.rs

@@ -33,7 +33,7 @@ pub enum ValTreeKind<'tcx> {
     /// The fields of any kind of aggregate. Structs, tuples and arrays are represented by
     /// listing their fields' values in order.
     ///
-    /// Enums are represented by storing their discriminant as a field, followed by all
+    /// Enums are represented by storing their variant index as a u32 field, followed by all
     /// the fields of the variant.
     ///
     /// ZST types are represented as an empty slice.

compiler/rustc_mir_transform/src/coroutine/by_move_body.rs

@@ -219,6 +219,8 @@ pub(crate) fn coroutine_by_move_body_def_id<'tcx>(
         mir::MirSource::from_instance(InstanceKind::Item(body_def.def_id().to_def_id()));
     dump_mir(tcx, false, "built", &"after", &by_move_body, |_, _| Ok(()));
 
+    // Feed HIR because we try to access this body's attrs in the inliner.
+    body_def.feed_hir();
     // Inherited from the by-ref coroutine.
     body_def.codegen_fn_attrs(tcx.codegen_fn_attrs(coroutine_def_id).clone());
     body_def.coverage_attr_on(tcx.coverage_attr_on(coroutine_def_id));

compiler/rustc_resolve/src/diagnostics.rs

@@ -1325,11 +1325,6 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
             })
         }
 
-        // If only some candidates are accessible, take just them
-        if !candidates.iter().all(|v: &ImportSuggestion| !v.accessible) {
-            candidates.retain(|x| x.accessible)
-        }
-
         candidates
     }
 
@@ -1793,7 +1788,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                 &import_suggestions,
                 Instead::Yes,
                 FoundUse::Yes,
-                DiagMode::Import { append: single_nested },
+                DiagMode::Import { append: single_nested, unresolved_import: false },
                 vec![],
                 "",
             );
@@ -2750,6 +2745,8 @@ pub(crate) enum DiagMode {
     Pattern,
     /// The binding is part of a use statement
     Import {
+        /// `true` means diagnostics is for unresolved import
+        unresolved_import: bool,
         /// `true` mean add the tips afterward for case `use a::{b,c}`,
         /// rather than replacing within.
         append: bool,
@@ -2800,6 +2797,7 @@ fn show_candidates(
         return false;
     }
 
+    let mut showed = false;
     let mut accessible_path_strings: Vec<PathString<'_>> = Vec::new();
     let mut inaccessible_path_strings: Vec<PathString<'_>> = Vec::new();
 
@@ -2958,8 +2956,11 @@ fn show_candidates(
             append_candidates(&mut msg, accessible_path_strings);
             err.help(msg);
         }
-        true
-    } else if !(inaccessible_path_strings.is_empty() || matches!(mode, DiagMode::Import { .. })) {
+        showed = true;
+    }
+    if !inaccessible_path_strings.is_empty()
+        && (!matches!(mode, DiagMode::Import { unresolved_import: false, .. }))
+    {
         let prefix =
             if let DiagMode::Pattern = mode { "you might have meant to match on " } else { "" };
         if let [(name, descr, source_span, note, _)] = &inaccessible_path_strings[..] {
@@ -3022,10 +3023,9 @@ fn show_candidates(
 
             err.span_note(multi_span, msg);
         }
-        true
-    } else {
-        false
+        showed = true;
     }
+    showed
 }
 
 #[derive(Debug)]

compiler/rustc_resolve/src/imports.rs

@@ -734,7 +734,7 @@ impl<'ra, 'tcx> Resolver<'ra, 'tcx> {
                         &mut diag,
                         Some(err.span),
                         candidates,
-                        DiagMode::Import { append: false },
+                        DiagMode::Import { append: false, unresolved_import: true },
                         (source != target)
                             .then(|| format!(" as {target}"))
                             .as_deref()

compiler/rustc_trait_selection/src/traits/effects.rs

@@ -106,10 +106,6 @@ fn match_candidate<'tcx>(
 
     more_nested(selcx, &mut nested);
 
-    for nested in &mut nested {
-        nested.set_depth_from_parent(obligation.recursion_depth);
-    }
-
     Ok(nested)
 }
 
@@ -378,10 +374,6 @@ fn evaluate_host_effect_from_selection_candiate<'tcx>(
                             }),
                     );
 
-                    for nested in &mut nested {
-                        nested.set_depth_from_parent(obligation.recursion_depth);
-                    }
-
                     Ok(nested)
                 }
                 _ => Err(EvaluationFailure::NoSolution),