Auto merge of #129142 - workingjubilee:rollup-7sspo84, r=workingjubilee

Rollup of 10 pull requests

Successful merges:

 - #128064 (Improve docs for Waker::noop and LocalWaker::noop)
 - #128922 (rust-analyzer: use in-tree `pattern_analysis` crate)
 - #128965 (Remove `print::Pat` from the printing of `WitnessPat`)
 - #128977 (Only try to modify file times of a writable file on Windows)
 - #129018 (Migrate `rlib-format-packed-bundled-libs` and `native-link-modifier-bundle` `run-make` tests to rmake)
 - #129037 (Port `run-make/libtest-json` and `run-make/libtest-junit` to rmake)
 - #129078 (`ParamEnvAnd::fully_perform`: we have an `ocx`, use it)
 - #129110 (Add a comment explaining the return type of `Ty::kind`.)
 - #129111 (Port the `sysroot-crates-are-unstable` Python script to rmake)
 - #129135 (crashes: more tests)

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

compiler/rustc_middle/src/ty/sty.rs

@@ -970,6 +970,10 @@ impl<'tcx> rustc_type_ir::inherent::Ty<TyCtxt<'tcx>> for Ty<'tcx> {
 
 /// Type utilities
 impl<'tcx> Ty<'tcx> {
+    // It would be nicer if this returned the value instead of a reference,
+    // like how `Predicate::kind` and `Region::kind` do. (It would result in
+    // many fewer subsequent dereferences.) But that gives a small but
+    // noticeable performance hit. See #126069 for details.
     #[inline(always)]
     pub fn kind(self) -> &'tcx TyKind<'tcx> {
         self.0.0

compiler/rustc_pattern_analysis/src/rustc.rs

@@ -774,17 +774,16 @@ impl<'p, 'tcx: 'p> RustcPatCtxt<'p, 'tcx> {
         }
     }
 
-    /// Convert to a [`print::Pat`] for diagnostic purposes.
-    fn hoist_pat_range(&self, range: &IntRange, ty: RevealedTy<'tcx>) -> print::Pat<'tcx> {
-        use print::{Pat, PatKind};
+    /// Prints an [`IntRange`] to a string for diagnostic purposes.
+    fn print_pat_range(&self, range: &IntRange, ty: RevealedTy<'tcx>) -> String {
         use MaybeInfiniteInt::*;
         let cx = self;
-        let kind = if matches!((range.lo, range.hi), (NegInfinity, PosInfinity)) {
-            PatKind::Wild
+        if matches!((range.lo, range.hi), (NegInfinity, PosInfinity)) {
+            "_".to_string()
         } else if range.is_singleton() {
             let lo = cx.hoist_pat_range_bdy(range.lo, ty);
             let value = lo.as_finite().unwrap();
-            PatKind::Constant { value }
+            value.to_string()
         } else {
             // We convert to an inclusive range for diagnostics.
             let mut end = rustc_hir::RangeEnd::Included;
@@ -807,32 +806,24 @@ impl<'p, 'tcx: 'p> RustcPatCtxt<'p, 'tcx> {
                 range.hi
             };
             let hi = cx.hoist_pat_range_bdy(hi, ty);
-            PatKind::Range(Box::new(PatRange { lo, hi, end, ty: ty.inner() }))
-        };
-
-        Pat { ty: ty.inner(), kind }
+            PatRange { lo, hi, end, ty: ty.inner() }.to_string()
+        }
     }
 
     /// Prints a [`WitnessPat`] to an owned string, for diagnostic purposes.
+    ///
+    /// This panics for patterns that don't appear in diagnostics, like float ranges.
     pub fn print_witness_pat(&self, pat: &WitnessPat<'p, 'tcx>) -> String {
-        // This works by converting the witness pattern to a `print::Pat`
-        // and then printing that, but callers don't need to know that.
-        self.hoist_witness_pat(pat).to_string()
-    }
-
-    /// Convert to a [`print::Pat`] for diagnostic purposes. This panics for patterns that don't
-    /// appear in diagnostics, like float ranges.
-    fn hoist_witness_pat(&self, pat: &WitnessPat<'p, 'tcx>) -> print::Pat<'tcx> {
-        use print::{FieldPat, Pat, PatKind};
         let cx = self;
-        let hoist = |p| Box::new(cx.hoist_witness_pat(p));
-        let kind = match pat.ctor() {
-            Bool(b) => PatKind::Constant { value: mir::Const::from_bool(cx.tcx, *b) },
-            IntRange(range) => return self.hoist_pat_range(range, *pat.ty()),
+        let print = |p| cx.print_witness_pat(p);
+        match pat.ctor() {
+            Bool(b) => b.to_string(),
+            Str(s) => s.to_string(),
+            IntRange(range) => return self.print_pat_range(range, *pat.ty()),
             Struct if pat.ty().is_box() => {
                 // Outside of the `alloc` crate, the only way to create a struct pattern
                 // of type `Box` is to use a `box` pattern via #[feature(box_patterns)].
-                PatKind::Box { subpattern: hoist(&pat.fields[0]) }
+                format!("box {}", print(&pat.fields[0]))
             }
             Struct | Variant(_) | UnionField => {
                 let enum_info = match *pat.ty().kind() {
@@ -847,12 +838,29 @@ impl<'p, 'tcx: 'p> RustcPatCtxt<'p, 'tcx> {
                 let subpatterns = pat
                     .iter_fields()
                     .enumerate()
-                    .map(|(i, pat)| FieldPat { field: FieldIdx::new(i), pattern: hoist(pat) })
+                    .map(|(i, pat)| print::FieldPat {
+                        field: FieldIdx::new(i),
+                        pattern: print(pat),
+                        is_wildcard: would_print_as_wildcard(cx.tcx, pat),
+                    })
                     .collect::<Vec<_>>();
 
-                PatKind::StructLike { enum_info, subpatterns }
+                let mut s = String::new();
+                print::write_struct_like(
+                    &mut s,
+                    self.tcx,
+                    pat.ty().inner(),
+                    &enum_info,
+                    &subpatterns,
+                )
+                .unwrap();
+                s
+            }
+            Ref => {
+                let mut s = String::new();
+                print::write_ref_like(&mut s, pat.ty().inner(), &print(&pat.fields[0])).unwrap();
+                s
             }
-            Ref => PatKind::Deref { subpattern: hoist(&pat.fields[0]) },
             Slice(slice) => {
                 let (prefix_len, has_dot_dot) = match slice.kind {
                     SliceKind::FixedLen(len) => (len, false),
@@ -879,24 +887,23 @@ impl<'p, 'tcx: 'p> RustcPatCtxt<'p, 'tcx> {
                     }
                 }
 
-                let prefix = prefix.iter().map(hoist).collect();
-                let suffix = suffix.iter().map(hoist).collect();
+                let prefix = prefix.iter().map(print).collect::<Vec<_>>();
+                let suffix = suffix.iter().map(print).collect::<Vec<_>>();
 
-                PatKind::Slice { prefix, has_dot_dot, suffix }
+                let mut s = String::new();
+                print::write_slice_like(&mut s, &prefix, has_dot_dot, &suffix).unwrap();
+                s
             }
-            &Str(value) => PatKind::Constant { value },
-            Never if self.tcx.features().never_patterns => PatKind::Never,
-            Never | Wildcard | NonExhaustive | Hidden | PrivateUninhabited => PatKind::Wild,
+            Never if self.tcx.features().never_patterns => "!".to_string(),
+            Never | Wildcard | NonExhaustive | Hidden | PrivateUninhabited => "_".to_string(),
             Missing { .. } => bug!(
                 "trying to convert a `Missing` constructor into a `Pat`; this is probably a bug,
                 `Missing` should have been processed in `apply_constructors`"
             ),
             F16Range(..) | F32Range(..) | F64Range(..) | F128Range(..) | Opaque(..) | Or => {
                 bug!("can't convert to pattern: {:?}", pat)
             }
-        };
-
-        Pat { ty: pat.ty().inner(), kind }
+        }
     }
 }
 
@@ -972,7 +979,7 @@ impl<'p, 'tcx: 'p> PatCx for RustcPatCtxt<'p, 'tcx> {
         overlaps_on: IntRange,
         overlaps_with: &[&crate::pat::DeconstructedPat<Self>],
     ) {
-        let overlap_as_pat = self.hoist_pat_range(&overlaps_on, *pat.ty());
+        let overlap_as_pat = self.print_pat_range(&overlaps_on, *pat.ty());
         let overlaps: Vec<_> = overlaps_with
             .iter()
             .map(|pat| pat.data().span)
@@ -1012,7 +1019,7 @@ impl<'p, 'tcx: 'p> PatCx for RustcPatCtxt<'p, 'tcx> {
             suggested_range.end = rustc_hir::RangeEnd::Included;
             suggested_range.to_string()
         };
-        let gap_as_pat = self.hoist_pat_range(&gap, *pat.ty());
+        let gap_as_pat = self.print_pat_range(&gap, *pat.ty());
         if gapped_with.is_empty() {
             // If `gapped_with` is empty, `gap == T::MAX`.
             self.tcx.emit_node_span_lint(

compiler/rustc_pattern_analysis/src/rustc/print.rs

@@ -11,75 +11,16 @@
 
 use std::fmt;
 
-use rustc_middle::thir::PatRange;
+use rustc_middle::bug;
 use rustc_middle::ty::{self, AdtDef, Ty, TyCtxt};
-use rustc_middle::{bug, mir};
 use rustc_span::sym;
 use rustc_target::abi::{FieldIdx, VariantIdx};
 
 #[derive(Clone, Debug)]
-pub(crate) struct FieldPat<'tcx> {
+pub(crate) struct FieldPat {
     pub(crate) field: FieldIdx,
-    pub(crate) pattern: Box<Pat<'tcx>>,
-}
-
-#[derive(Clone, Debug)]
-pub(crate) struct Pat<'tcx> {
-    pub(crate) ty: Ty<'tcx>,
-    pub(crate) kind: PatKind<'tcx>,
-}
-
-#[derive(Clone, Debug)]
-pub(crate) enum PatKind<'tcx> {
-    Wild,
-
-    StructLike {
-        enum_info: EnumInfo<'tcx>,
-        subpatterns: Vec<FieldPat<'tcx>>,
-    },
-
-    Box {
-        subpattern: Box<Pat<'tcx>>,
-    },
-
-    Deref {
-        subpattern: Box<Pat<'tcx>>,
-    },
-
-    Constant {
-        value: mir::Const<'tcx>,
-    },
-
-    Range(Box<PatRange<'tcx>>),
-
-    Slice {
-        prefix: Box<[Box<Pat<'tcx>>]>,
-        /// True if this slice-like pattern should include a `..` between the
-        /// prefix and suffix.
-        has_dot_dot: bool,
-        suffix: Box<[Box<Pat<'tcx>>]>,
-    },
-
-    Never,
-}
-
-impl<'tcx> fmt::Display for Pat<'tcx> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self.kind {
-            PatKind::Wild => write!(f, "_"),
-            PatKind::Never => write!(f, "!"),
-            PatKind::Box { ref subpattern } => write!(f, "box {subpattern}"),
-            PatKind::StructLike { ref enum_info, ref subpatterns } => {
-                ty::tls::with(|tcx| write_struct_like(f, tcx, self.ty, enum_info, subpatterns))
-            }
-            PatKind::Deref { ref subpattern } => write_ref_like(f, self.ty, subpattern),
-            PatKind::Constant { value } => write!(f, "{value}"),
-            PatKind::Range(ref range) => write!(f, "{range}"),
-            PatKind::Slice { ref prefix, has_dot_dot, ref suffix } => {
-                write_slice_like(f, prefix, has_dot_dot, suffix)
-            }
-        }
-    }
+    pub(crate) pattern: String,
+    pub(crate) is_wildcard: bool,
 }
 
 /// Returns a closure that will return `""` when called the first time,
@@ -103,12 +44,12 @@ pub(crate) enum EnumInfo<'tcx> {
     NotEnum,
 }
 
-fn write_struct_like<'tcx>(
+pub(crate) fn write_struct_like<'tcx>(
     f: &mut impl fmt::Write,
     tcx: TyCtxt<'_>,
     ty: Ty<'tcx>,
     enum_info: &EnumInfo<'tcx>,
-    subpatterns: &[FieldPat<'tcx>],
+    subpatterns: &[FieldPat],
 ) -> fmt::Result {
     let variant_and_name = match *enum_info {
         EnumInfo::Enum { adt_def, variant_index } => {
@@ -139,12 +80,12 @@ fn write_struct_like<'tcx>(
             write!(f, " {{ ")?;
 
             let mut printed = 0;
-            for p in subpatterns {
-                if let PatKind::Wild = p.pattern.kind {
+            for &FieldPat { field, ref pattern, is_wildcard } in subpatterns {
+                if is_wildcard {
                     continue;
                 }
-                let name = variant.fields[p.field].name;
-                write!(f, "{}{}: {}", start_or_comma(), name, p.pattern)?;
+                let field_name = variant.fields[field].name;
+                write!(f, "{}{field_name}: {pattern}", start_or_comma())?;
                 printed += 1;
             }
 
@@ -184,10 +125,10 @@ fn write_struct_like<'tcx>(
     Ok(())
 }
 
-fn write_ref_like<'tcx>(
+pub(crate) fn write_ref_like<'tcx>(
     f: &mut impl fmt::Write,
     ty: Ty<'tcx>,
-    subpattern: &Pat<'tcx>,
+    subpattern: &str,
 ) -> fmt::Result {
     match ty.kind() {
         ty::Ref(_, _, mutbl) => {
@@ -198,11 +139,11 @@ fn write_ref_like<'tcx>(
     write!(f, "{subpattern}")
 }
 
-fn write_slice_like<'tcx>(
+pub(crate) fn write_slice_like(
     f: &mut impl fmt::Write,
-    prefix: &[Box<Pat<'tcx>>],
+    prefix: &[String],
     has_dot_dot: bool,
-    suffix: &[Box<Pat<'tcx>>],
+    suffix: &[String],
 ) -> fmt::Result {
     let mut start_or_comma = start_or_comma();
     write!(f, "[")?;

compiler/rustc_trait_selection/src/traits/query/type_op/mod.rs

@@ -168,44 +168,12 @@ where
         // collecting region constraints via `region_constraints`.
         let (mut output, _) = scrape_region_constraints(
             infcx,
-            |_ocx| {
-                let (output, ei, mut obligations, _) =
+            |ocx| {
+                let (output, ei, obligations, _) =
                     Q::fully_perform_into(self, infcx, &mut region_constraints, span)?;
                 error_info = ei;
 
-                // Typically, instantiating NLL query results does not
-                // create obligations. However, in some cases there
-                // are unresolved type variables, and unify them *can*
-                // create obligations. In that case, we have to go
-                // fulfill them. We do this via a (recursive) query.
-                while !obligations.is_empty() {
-                    trace!("{:#?}", obligations);
-                    let mut progress = false;
-                    for obligation in std::mem::take(&mut obligations) {
-                        let obligation = infcx.resolve_vars_if_possible(obligation);
-                        match ProvePredicate::fully_perform_into(
-                            obligation.param_env.and(ProvePredicate::new(obligation.predicate)),
-                            infcx,
-                            &mut region_constraints,
-                            span,
-                        ) {
-                            Ok(((), _, new, certainty)) => {
-                                obligations.extend(new);
-                                progress = true;
-                                if let Certainty::Ambiguous = certainty {
-                                    obligations.push(obligation);
-                                }
-                            }
-                            Err(_) => obligations.push(obligation),
-                        }
-                    }
-                    if !progress {
-                        infcx.dcx().span_bug(
-                            span,
-                            format!("ambiguity processing {obligations:?} from {self:?}"),
-                        );
-                    }
-                }
+                ocx.register_obligations(obligations);
                 Ok(output)
             },
             "fully_perform",

library/core/src/task/wake.rs

@@ -530,10 +530,18 @@ impl Waker {
 
     /// Returns a reference to a `Waker` that does nothing when used.
     ///
+    // Note!  Much of the documentation for this method is duplicated
+    // in the docs for `LocalWaker::noop`.
+    // If you edit it, consider editing the other copy too.
+    //
     /// This is mostly useful for writing tests that need a [`Context`] to poll
     /// some futures, but are not expecting those futures to wake the waker or
     /// do not need to do anything specific if it happens.
     ///
+    /// More generally, using `Waker::noop()` to poll a future
+    /// means discarding the notification of when the future should be polled again.
+    /// So it should only be used when such a notification will not be needed to make progress.
+    ///
     /// If an owned `Waker` is needed, `clone()` this one.
     ///
     /// # Examples
@@ -783,12 +791,22 @@ impl LocalWaker {
         Self { waker }
     }
 
-    /// Creates a new `LocalWaker` that does nothing when `wake` is called.
+    /// Returns a reference to a `LocalWaker` that does nothing when used.
     ///
+    // Note!  Much of the documentation for this method is duplicated
+    // in the docs for `Waker::noop`.
+    // If you edit it, consider editing the other copy too.
+    //
     /// This is mostly useful for writing tests that need a [`Context`] to poll
     /// some futures, but are not expecting those futures to wake the waker or
     /// do not need to do anything specific if it happens.
     ///
+    /// More generally, using `LocalWaker::noop()` to poll a future
+    /// means discarding the notification of when the future should be polled again,
+    /// So it should only be used when such a notification will not be needed to make progress.
+    ///
+    /// If an owned `LocalWaker` is needed, `clone()` this one.
+    ///
     /// # Examples
     ///
     /// ```

src/bootstrap/src/core/download.rs

@@ -703,9 +703,7 @@ download-rustc = false
             let file_times = fs::FileTimes::new().set_accessed(now).set_modified(now);
 
             let llvm_config = llvm_root.join("bin").join(exe("llvm-config", self.build));
-            let llvm_config_file = t!(File::options().write(true).open(llvm_config));
-
-            t!(llvm_config_file.set_times(file_times));
+            t!(crate::utils::helpers::set_file_times(llvm_config, file_times));
 
             if self.should_fix_bins_and_dylibs() {
                 let llvm_lib = llvm_root.join("lib");

src/bootstrap/src/lib.rs

@@ -37,7 +37,9 @@ use crate::core::builder;
 use crate::core::builder::{Builder, Kind};
 use crate::core::config::{flags, DryRun, LldMode, LlvmLibunwind, Target, TargetSelection};
 use crate::utils::exec::{command, BehaviorOnFailure, BootstrapCommand, CommandOutput, OutputMode};
-use crate::utils::helpers::{self, dir_is_empty, exe, libdir, mtime, output, symlink_dir};
+use crate::utils::helpers::{
+    self, dir_is_empty, exe, libdir, mtime, output, set_file_times, symlink_dir,
+};
 
 mod core;
 mod utils;
@@ -1792,21 +1794,20 @@ Executed at: {executed_at}"#,
             }
         }
         if let Ok(()) = fs::hard_link(&src, dst) {
-            // Attempt to "easy copy" by creating a hard link
-            // (symlinks don't work on windows), but if that fails
-            // just fall back to a slow `copy` operation.
+            // Attempt to "easy copy" by creating a hard link (symlinks are priviledged on windows),
+            // but if that fails just fall back to a slow `copy` operation.
         } else {
             if let Err(e) = fs::copy(&src, dst) {
                 panic!("failed to copy `{}` to `{}`: {}", src.display(), dst.display(), e)
             }
             t!(fs::set_permissions(dst, metadata.permissions()));
 
+            // Restore file times because changing permissions on e.g. Linux using `chmod` can cause
+            // file access time to change.
             let file_times = fs::FileTimes::new()
                 .set_accessed(t!(metadata.accessed()))
                 .set_modified(t!(metadata.modified()));
-
-            let dst_file = t!(fs::File::open(dst));
-            t!(dst_file.set_times(file_times));
+            t!(set_file_times(dst, file_times));
         }
     }
 

src/bootstrap/src/utils/helpers.rs

@@ -544,3 +544,15 @@ pub fn get_closest_merge_base_commit(
 
     Ok(output_result(git.as_command_mut())?.trim().to_owned())
 }
+
+/// Sets the file times for a given file at `path`.
+pub fn set_file_times<P: AsRef<Path>>(path: P, times: fs::FileTimes) -> io::Result<()> {
+    // Windows requires file to be writable to modify file times. But on Linux CI the file does not
+    // need to be writable to modify file times and might be read-only.
+    let f = if cfg!(windows) {
+        fs::File::options().write(true).open(path)?
+    } else {
+        fs::File::open(path)?
+    };
+    f.set_times(times)
+}

src/bootstrap/src/utils/helpers/tests.rs

@@ -3,7 +3,8 @@ use std::io::Write;
 use std::path::PathBuf;
 
 use crate::utils::helpers::{
-    check_cfg_arg, extract_beta_rev, hex_encode, make, program_out_of_date, symlink_dir,
+    check_cfg_arg, extract_beta_rev, hex_encode, make, program_out_of_date, set_file_times,
+    symlink_dir,
 };
 use crate::{Config, Flags};
 
@@ -92,3 +93,24 @@ fn test_symlink_dir() {
     #[cfg(not(windows))]
     fs::remove_file(link_path).unwrap();
 }
+
+#[test]
+fn test_set_file_times_sanity_check() {
+    let config = Config::parse(&["check".to_owned(), "--config=/does/not/exist".to_owned()]);
+    let tempfile = config.tempdir().join(".tmp-file");
+
+    {
+        File::create(&tempfile).unwrap().write_all(b"dummy value").unwrap();
+        assert!(tempfile.exists());
+    }
+
+    // This might only fail on Windows (if file is default read-only then we try to modify file
+    // times).
+    let unix_epoch = std::time::SystemTime::UNIX_EPOCH;
+    let target_time = fs::FileTimes::new().set_accessed(unix_epoch).set_modified(unix_epoch);
+    set_file_times(&tempfile, target_time).unwrap();
+
+    let found_metadata = fs::metadata(tempfile).unwrap();
+    assert_eq!(found_metadata.accessed().unwrap(), unix_epoch);
+    assert_eq!(found_metadata.modified().unwrap(), unix_epoch)
+}

src/tools/run-make-support/src/external_deps/llvm.rs

@@ -297,6 +297,12 @@ impl LlvmAr {
         self
     }
 
+    /// Print the table of contents.
+    pub fn table_of_contents(&mut self) -> &mut Self {
+        self.cmd.arg("t");
+        self
+    }
+
     /// Provide an output, then an input file. Bundled in one function, as llvm-ar has
     /// no "--output"-style flag.
     pub fn output_input(&mut self, out: impl AsRef<Path>, input: impl AsRef<Path>) -> &mut Self {

src/tools/rust-analyzer/crates/hir-ty/src/lib.rs

@@ -15,8 +15,10 @@ extern crate rustc_abi;
 #[cfg(not(feature = "in-rust-tree"))]
 extern crate ra_ap_rustc_abi as rustc_abi;
 
-// Use the crates.io version unconditionally until the API settles enough that we can switch to
-// using the in-tree one.
+#[cfg(feature = "in-rust-tree")]
+extern crate rustc_pattern_analysis;
+
+#[cfg(not(feature = "in-rust-tree"))]
 extern crate ra_ap_rustc_pattern_analysis as rustc_pattern_analysis;
 
 mod builder;

src/tools/tidy/src/allowed_run_make_makefiles.txt

@@ -6,13 +6,9 @@ run-make/incr-add-rust-src-component/Makefile
 run-make/issue-84395-lto-embed-bitcode/Makefile
 run-make/jobserver-error/Makefile
 run-make/libs-through-symlinks/Makefile
-run-make/libtest-json/Makefile
-run-make/libtest-junit/Makefile
 run-make/libtest-thread-limit/Makefile
 run-make/macos-deployment-target/Makefile
-run-make/native-link-modifier-bundle/Makefile
 run-make/reproducible-build/Makefile
-run-make/rlib-format-packed-bundled-libs/Makefile
 run-make/split-debuginfo/Makefile
 run-make/symbol-mangling-hashed/Makefile
 run-make/translation/Makefile

tests/crashes/128695.rs

@@ -0,0 +1,11 @@
+//@ known-bug: rust-lang/rust#128695
+//@ edition: 2021
+
+use core::pin::{pin, Pin};
+
+fn main() {
+    let fut = pin!(async {
+        let async_drop_fut = pin!(core::future::async_drop(async {}));
+        (async_drop_fut).await;
+    });
+}

tests/crashes/128810.rs

@@ -0,0 +1,25 @@
+//@ known-bug: rust-lang/rust#128810
+
+#![feature(fn_delegation)]
+
+use std::marker::PhantomData;
+
+pub struct InvariantRef<'a, T: ?Sized>(&'a T, PhantomData<&'a mut &'a T>);
+
+impl<'a> InvariantRef<'a, ()> {
+    pub const NEW: Self = InvariantRef::new(&());
+}
+
+trait Trait {
+    fn foo(&self) -> u8 { 0 }
+    fn bar(&self) -> u8 { 1 }
+    fn meh(&self) -> u8 { 2 }
+}
+
+struct Z(u8);
+
+impl Trait for Z {
+    reuse <u8 as Trait>::{foo, bar, meh} { &const { InvariantRef::<'a>::NEW } }
+}
+
+fn main() { }

tests/crashes/128848.rs

@@ -0,0 +1,5 @@
+//@ known-bug: rust-lang/rust#128848
+
+fn f<T>(a: T, b: T, c: T)  {
+    f.call_once()
+}

tests/crashes/128870.rs

@@ -0,0 +1,18 @@
+//@ known-bug: rust-lang/rust#128870
+//@ compile-flags: -Zvalidate-mir
+
+#[repr(packed)]
+#[repr(u32)]
+enum E {
+    A,
+    B,
+    C,
+}
+
+fn main() {
+    union InvalidTag {
+        int: u32,
+        e: E,
+    }
+    let _invalid_tag = InvalidTag { int: 4 };
+}

tests/crashes/129075.rs

@@ -0,0 +1,16 @@
+//@ known-bug: rust-lang/rust#129075
+//@ compile-flags: -Zvalidate-mir -Zinline-mir=yes
+
+struct Foo<T>([T; 2]);
+
+impl<T: Default + Copy> Default for Foo<T> {
+    fn default(&mut self) -> Self {
+        Foo([Default::default(); 2])
+    }
+}
+
+fn field_array() {
+    let a: i32;
+    let b;
+    Foo([a, b]) = Default::default();
+}

tests/crashes/129095.rs

@@ -0,0 +1,10 @@
+//@ known-bug: rust-lang/rust#129095
+//@ compile-flags: -Zmir-opt-level=5 -Zvalidate-mir
+
+pub fn function_with_bytes<const BYTES: &'static [u8; 4]>() -> &'static [u8] {
+    BYTES
+}
+
+pub fn main() {
+    assert_eq!(function_with_bytes::<b"AAAAb">(), &[0x41, 0x41, 0x41, 0x41]);
+}

tests/crashes/129099.rs

@@ -0,0 +1,15 @@
+//@ known-bug: rust-lang/rust#129099
+
+#![feature(type_alias_impl_trait)]
+
+fn dyn_hoops<T: Sized>() -> dyn for<'a> Iterator<Item = impl Captures<'a>> {
+    loop {}
+}
+
+pub fn main() {
+    type Opaque = impl Sized;
+    fn define() -> Opaque {
+        let x: Opaque = dyn_hoops::<()>(0);
+        x
+    }
+}

tests/crashes/129109.rs

@@ -0,0 +1,10 @@
+//@ known-bug: rust-lang/rust#129109
+//@ compile-flags: -Zmir-opt-level=5 -Zvalidate-mir
+
+extern "C" {
+    pub static mut symbol: [i8];
+}
+
+fn main() {
+    println!("C", unsafe { &symbol });
+}

tests/crashes/129127.rs

@@ -0,0 +1,21 @@
+//@ known-bug: rust-lang/rust#129127
+//@ compile-flags: -Zmir-opt-level=5 -Zvalidate-mir -Zcross-crate-inline-threshold=always
+
+
+
+
+pub struct Rows<'a>();
+
+impl<'a> Iterator for Rows<'a> {
+    type Item = ();
+
+    fn next() -> Option<Self::Item> {
+        let mut rows = Rows();
+        rows.map(|row| row).next()
+    }
+}
+
+fn main() {
+    let mut rows = Rows();
+    rows.next();
+}

tests/run-make/libtest-json/Makefile

@@ -7,4 +7,4 @@
 { "type": "test", "name": "c", "event": "ok" }
 { "type": "test", "event": "started", "name": "d" }
 { "type": "test", "name": "d", "event": "ignored", "message": "msg" }
-{ "type": "suite", "event": "failed", "passed": 2, "failed": 1, "ignored": 1, "measured": 0, "filtered_out": 0, "exec_time": $TIME }
+{ "type": "suite", "event": "failed", "passed": 2, "failed": 1, "ignored": 1, "measured": 0, "filtered_out": 0, "exec_time": "$EXEC_TIME" }

tests/run-make/libtest-json/output-default.json

@@ -7,4 +7,4 @@
 { "type": "test", "name": "c", "event": "ok", "stdout": "thread 'c' panicked at f.rs:15:5:\nassertion failed: false\n" }
 { "type": "test", "event": "started", "name": "d" }
 { "type": "test", "name": "d", "event": "ignored", "message": "msg" }
-{ "type": "suite", "event": "failed", "passed": 2, "failed": 1, "ignored": 1, "measured": 0, "filtered_out": 0, "exec_time": $TIME }
+{ "type": "suite", "event": "failed", "passed": 2, "failed": 1, "ignored": 1, "measured": 0, "filtered_out": 0, "exec_time": "$EXEC_TIME" }

tests/run-make/libtest-json/output-stdout-success.json

@@ -0,0 +1,31 @@
+// Check libtest's JSON output against snapshots.
+
+//@ ignore-cross-compile
+//@ needs-unwind (test file contains #[should_panic] test)
+
+use run_make_support::{cmd, diff, python_command, rustc};
+
+fn main() {
+    rustc().arg("--test").input("f.rs").run();
+
+    run_tests(&[], "output-default.json");
+    run_tests(&["--show-output"], "output-stdout-success.json");
+}
+
+#[track_caller]
+fn run_tests(extra_args: &[&str], expected_file: &str) {
+    let cmd_out = cmd("./f")
+        .env("RUST_BACKTRACE", "0")
+        .args(&["-Zunstable-options", "--test-threads=1", "--format=json"])
+        .args(extra_args)
+        .run_fail();
+    let test_stdout = &cmd_out.stdout_utf8();
+
+    python_command().arg("validate_json.py").stdin(test_stdout).run();
+
+    diff()
+        .expected_file(expected_file)
+        .actual_text("stdout", test_stdout)
+        .normalize(r#"(?<prefix>"exec_time": )[0-9.]+"#, r#"${prefix}"$$EXEC_TIME""#)
+        .run();
+}

tests/run-make/libtest-json/rmake.rs

@@ -0,0 +1,31 @@
+// Check libtest's JUnit (XML) output against snapshots.
+
+//@ ignore-cross-compile
+//@ needs-unwind (test file contains #[should_panic] test)
+
+use run_make_support::{cmd, diff, python_command, rustc};
+
+fn main() {
+    rustc().arg("--test").input("f.rs").run();
+
+    run_tests(&[], "output-default.xml");
+    run_tests(&["--show-output"], "output-stdout-success.xml");
+}
+
+#[track_caller]
+fn run_tests(extra_args: &[&str], expected_file: &str) {
+    let cmd_out = cmd("./f")
+        .env("RUST_BACKTRACE", "0")
+        .args(&["-Zunstable-options", "--test-threads=1", "--format=junit"])
+        .args(extra_args)
+        .run_fail();
+    let test_stdout = &cmd_out.stdout_utf8();
+
+    python_command().arg("validate_junit.py").stdin(test_stdout).run();
+
+    diff()
+        .expected_file(expected_file)
+        .actual_text("stdout", test_stdout)
+        .normalize(r#"\btime="[0-9.]+""#, r#"time="$$TIME""#)
+        .run();
+}

tests/run-make/libtest-junit/Makefile

@@ -0,0 +1,90 @@
+// This test exercises the `bundle` link argument, which can be turned on or off.
+
+// When building a rlib or staticlib, +bundle means that all object files from the native static
+// library will be added to the rlib or staticlib archive, and then used from it during linking of
+// the final binary.
+
+// When building a rlib -bundle means that the native static library is registered as a dependency
+// of that rlib "by name", and object files from it are included only during linking of the final
+// binary, the file search by that name is also performed during final linking.
+// When building a staticlib -bundle means that the native static library is simply not included
+// into the archive and some higher level build system will need to add it later during linking of
+// the final binary.
+
+// This modifier has no effect when building other targets like executables or dynamic libraries.
+
+// The default for this modifier is +bundle.
+// See https://github.com/rust-lang/rust/pull/95818
+
+//@ ignore-cross-compile
+// Reason: cross-compilation fails to export native symbols
+
+use run_make_support::{
+    build_native_static_lib, dynamic_lib_name, is_msvc, llvm_nm, rust_lib_name, rustc,
+    static_lib_name,
+};
+
+fn main() {
+    build_native_static_lib("native-staticlib");
+    // Build a staticlib and a rlib, the `native_func` symbol will be bundled into them
+    rustc().input("bundled.rs").crate_type("staticlib").crate_type("rlib").run();
+    llvm_nm()
+        .input(static_lib_name("bundled"))
+        .run()
+        .assert_stdout_contains_regex("T _*native_func");
+    llvm_nm()
+        .input(static_lib_name("bundled"))
+        .run()
+        .assert_stdout_contains_regex("U _*native_func");
+    llvm_nm().input(rust_lib_name("bundled")).run().assert_stdout_contains_regex("T _*native_func");
+    llvm_nm().input(rust_lib_name("bundled")).run().assert_stdout_contains_regex("U _*native_func");
+
+    // Build a staticlib and a rlib, the `native_func` symbol will not be bundled into it
+    build_native_static_lib("native-staticlib");
+    rustc().input("non-bundled.rs").crate_type("staticlib").crate_type("rlib").run();
+    llvm_nm()
+        .input(static_lib_name("non_bundled"))
+        .run()
+        .assert_stdout_not_contains_regex("T _*native_func");
+    llvm_nm()
+        .input(static_lib_name("non_bundled"))
+        .run()
+        .assert_stdout_contains_regex("U _*native_func");
+    llvm_nm()
+        .input(rust_lib_name("non_bundled"))
+        .run()
+        .assert_stdout_not_contains_regex("T _*native_func");
+    llvm_nm()
+        .input(rust_lib_name("non_bundled"))
+        .run()
+        .assert_stdout_contains_regex("U _*native_func");
+
+    // This part of the test does not function on Windows MSVC - no symbols are printed.
+    if !is_msvc() {
+        // Build a cdylib, `native-staticlib` will not appear on the linker line because it was
+        // bundled previously. The cdylib will contain the `native_func` symbol in the end.
+        rustc()
+            .input("cdylib-bundled.rs")
+            .crate_type("cdylib")
+            .print("link-args")
+            .run()
+            .assert_stdout_not_contains(r#"-l[" ]*native-staticlib"#);
+        llvm_nm()
+            .input(dynamic_lib_name("cdylib_bundled"))
+            .run()
+            .assert_stdout_contains_regex("[Tt] _*native_func");
+
+        // Build a cdylib, `native-staticlib` will appear on the linker line because it was not
+        // bundled previously. The cdylib will contain the `native_func` symbol in the end
+        rustc()
+            .input("cdylib-non-bundled.rs")
+            .crate_type("cdylib")
+            .print("link-args")
+            .run()
+            .assert_stdout_contains_regex(r#"-l[" ]*native-staticlib"#);
+        llvm_nm()
+            .input(dynamic_lib_name("cdylib_non_bundled"))
+            .run()
+            .assert_stdout_contains_regex("[Tt] _*native_func");
+    }
+}

tests/run-make/libtest-junit/rmake.rs

@@ -0,0 +1,84 @@
+// `-Z packed_bundled_libs` is an unstable rustc flag that makes the compiler
+// only require a native library and no supplementary object files to compile.
+// Output files compiled with this flag should still contain all expected symbols -
+// that is what this test checks.
+// See https://github.com/rust-lang/rust/pull/100101
+
+//@ ignore-cross-compile
+// Reason: cross-compilation fails to export native symbols
+
+use run_make_support::{
+    bin_name, build_native_static_lib, cwd, filename_contains, is_msvc, llvm_ar, llvm_nm, rfs,
+    rust_lib_name, rustc, shallow_find_files,
+};
+
+fn main() {
+    build_native_static_lib("native_dep_1");
+    build_native_static_lib("native_dep_2");
+    build_native_static_lib("native_dep_3");
+    rustc().input("rust_dep_up.rs").crate_type("rlib").arg("-Zpacked_bundled_libs").run();
+    llvm_nm()
+        .input(rust_lib_name("rust_dep_up"))
+        .run()
+        .assert_stdout_contains_regex("U.*native_f2");
+    llvm_nm()
+        .input(rust_lib_name("rust_dep_up"))
+        .run()
+        .assert_stdout_contains_regex("U.*native_f3");
+    llvm_nm()
+        .input(rust_lib_name("rust_dep_up"))
+        .run()
+        .assert_stdout_contains_regex("T.*rust_dep_up");
+    llvm_ar()
+        .table_of_contents()
+        .arg(rust_lib_name("rust_dep_up"))
+        .run()
+        .assert_stdout_contains("native_dep_2");
+    llvm_ar()
+        .table_of_contents()
+        .arg(rust_lib_name("rust_dep_up"))
+        .run()
+        .assert_stdout_contains("native_dep_3");
+    rustc()
+        .input("rust_dep_local.rs")
+        .extern_("rlib", rust_lib_name("rust_dep_up"))
+        .arg("-Zpacked_bundled_libs")
+        .crate_type("rlib")
+        .run();
+    llvm_nm()
+        .input(rust_lib_name("rust_dep_local"))
+        .run()
+        .assert_stdout_contains_regex("U.*native_f1");
+    llvm_nm()
+        .input(rust_lib_name("rust_dep_local"))
+        .run()
+        .assert_stdout_contains_regex("T.*rust_dep_local");
+    llvm_ar()
+        .table_of_contents()
+        .arg(rust_lib_name("rust_dep_local"))
+        .run()
+        .assert_stdout_contains("native_dep_1");
+
+    // Ensure the compiler will not use files it should not know about.
+    for file in shallow_find_files(cwd(), |path| filename_contains(path, "native_dep_")) {
+        rfs::remove_file(file);
+    }
+
+    rustc()
+        .input("main.rs")
+        .extern_("lib", rust_lib_name("rust_dep_local"))
+        .output(bin_name("main"))
+        .arg("-Zpacked_bundled_libs")
+        .print("link-args")
+        .run()
+        .assert_stdout_contains_regex("native_dep_1.*native_dep_2.*native_dep_3");
+
+    // The binary "main" will not contain any symbols on MSVC.
+    if !is_msvc() {
+        llvm_nm().input(bin_name("main")).run().assert_stdout_contains_regex("T.*native_f1");
+        llvm_nm().input(bin_name("main")).run().assert_stdout_contains_regex("T.*native_f2");
+        llvm_nm().input(bin_name("main")).run().assert_stdout_contains_regex("T.*native_f3");
+        llvm_nm().input(bin_name("main")).run().assert_stdout_contains_regex("T.*rust_dep_local");
+        llvm_nm().input(bin_name("main")).run().assert_stdout_contains_regex("T.*rust_dep_up");
+    }
+}

tests/run-make/native-link-modifier-bundle/Makefile

@@ -1,5 +1,102 @@
-use run_make_support::python_command;
+// Check that crates in the sysroot are treated as unstable, unless they are
+// on a list of known-stable sysroot crates.
+
+use std::path::{Path, PathBuf};
+use std::str;
+
+use run_make_support::{rfs, rustc, target};
+
+fn is_stable_crate(name: &str) -> bool {
+    matches!(name, "std" | "alloc" | "core" | "proc_macro")
+}
 
 fn main() {
-    python_command().arg("test.py").run();
+    for cr in get_unstable_sysroot_crates() {
+        check_crate_is_unstable(&cr);
+    }
+    println!("Done");
+}
+
+#[derive(Debug)]
+struct Crate {
+    name: String,
+    path: PathBuf,
+}
+
+fn check_crate_is_unstable(cr: &Crate) {
+    let Crate { name, path } = cr;
+
+    print!("- Verifying that sysroot crate '{name}' is an unstable crate ...");
+
+    // Trying to use this crate from a user program should fail.
+    let output = rustc()
+        .crate_type("rlib")
+        .target(target())
+        .extern_(name, path)
+        .input("-")
+        .stdin(format!("extern crate {name};"))
+        .run_fail();
+
+    // Make sure it failed for the intended reason, not some other reason.
+    // (The actual feature required varies between crates.)
+    output.assert_stderr_contains("use of unstable library feature");
+
+    println!(" OK");
+}
+
+fn get_unstable_sysroot_crates() -> Vec<Crate> {
+    let sysroot = PathBuf::from(rustc().print("sysroot").run().stdout_utf8().trim());
+    let sysroot_libs_dir = sysroot.join("lib").join("rustlib").join(target()).join("lib");
+    println!("Sysroot libs dir: {sysroot_libs_dir:?}");
+
+    // Generate a list of all library crates in the sysroot.
+    let sysroot_crates = get_all_crates_in_dir(&sysroot_libs_dir);
+    println!(
+        "Found {} sysroot crates: {:?}",
+        sysroot_crates.len(),
+        sysroot_crates.iter().map(|cr| &cr.name).collect::<Vec<_>>()
+    );
+
+    // Self-check: If we didn't find `core`, we probably checked the wrong directory.
+    assert!(
+        sysroot_crates.iter().any(|cr| cr.name == "core"),
+        "Couldn't find `core` in {sysroot_libs_dir:?}"
+    );
+
+    let unstable_sysroot_crates =
+        sysroot_crates.into_iter().filter(|cr| !is_stable_crate(&cr.name)).collect::<Vec<_>>();
+    // Self-check: There should be at least one unstable crate in the directory.
+    assert!(
+        !unstable_sysroot_crates.is_empty(),
+        "Couldn't find any unstable crates in {sysroot_libs_dir:?}"
+    );
+    unstable_sysroot_crates
+}
+
+fn get_all_crates_in_dir(libs_dir: &Path) -> Vec<Crate> {
+    let mut libs = vec![];
+    rfs::read_dir_entries(libs_dir, |path| {
+        if !path.is_file() {
+            return;
+        }
+        if let Some(name) = crate_name_from_path(path) {
+            libs.push(Crate { name, path: path.to_owned() });
+        }
+    });
+    libs.sort_by(|a, b| a.name.cmp(&b.name));
+    libs
+}
+
+/// Treat a file as a crate if its name begins with `lib` and ends with `.rlib`.
+/// The crate name is the part before the first hyphen (if any).
+fn crate_name_from_path(path: &Path) -> Option<String> {
+    let name = path
+        .file_name()?
+        .to_str()?
+        .strip_prefix("lib")?
+        .strip_suffix(".rlib")?
+        .split('-')
+        .next()
+        .expect("split always yields at least one string");
+    Some(name.to_owned())
 }