Auto merge of #109769 - JohnTitor:rollup-7n2bnpg, r=JohnTitor

Rollup of 7 pull requests

Successful merges:

 - #106985 (Enhanced doucmentation of binary search methods for `slice` and `VecDeque` for unsorted instances)
 - #109509 (compiletest: Don't allow tests with overlapping prefix names)
 - #109719 (RELEASES: Add "Only support Android NDK 25 or newer" to 1.68.0)
 - #109748 (Don't ICE on `DiscriminantKind` projection in new solver)
 - #109749 (Canonicalize float var as float in new solver)
 - #109761 (Drop binutils on powerpc-unknown-freebsd)
 - #109766 (Fix title for openharmony.md)

Failed merges:

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

RELEASES.md

@@ -94,6 +94,7 @@ Misc
 Compatibility Notes
 -------------------
 
+- [Only support Android NDK 25 or newer](https://blog.rust-lang.org/2023/01/09/android-ndk-update-r25.html)
 - [Add `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` to future-incompat report](https://github.com/rust-lang/rust/pull/103418/)
 - [Only specify `--target` by default for `-Zgcc-ld=lld` on wasm](https://github.com/rust-lang/rust/pull/101792/)
 - [Bump `IMPLIED_BOUNDS_ENTAILMENT` to Deny + ReportNow](https://github.com/rust-lang/rust/pull/106465/)

compiler/rustc_trait_selection/src/solve/canonicalize.rs

@@ -291,7 +291,7 @@ impl<'tcx> TypeFolder<TyCtxt<'tcx>> for Canonicalizer<'_, 'tcx> {
                 if nt != t {
                     return self.fold_ty(nt);
                 } else {
-                    CanonicalVarKind::Ty(CanonicalTyVarKind::Int)
+                    CanonicalVarKind::Ty(CanonicalTyVarKind::Float)
                 }
             }
             ty::Infer(ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_)) => {

compiler/rustc_trait_selection/src/solve/project_goals.rs

@@ -344,10 +344,8 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> {
                         LangItem::Sized,
                         [ty::GenericArg::from(goal.predicate.self_ty())],
                     ));
-
                     ecx.add_goal(goal.with(tcx, sized_predicate));
-                    ecx.eq(goal.param_env, goal.predicate.term, tcx.types.unit.into())?;
-                    return ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes);
+                    tcx.types.unit
                 }
 
                 ty::Adt(def, substs) if def.is_struct() => {
@@ -483,9 +481,49 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> {
         ecx: &mut EvalCtxt<'_, 'tcx>,
         goal: Goal<'tcx, Self>,
     ) -> QueryResult<'tcx> {
-        let discriminant = goal.predicate.self_ty().discriminant_ty(ecx.tcx());
+        let self_ty = goal.predicate.self_ty();
+        let discriminant_ty = match *self_ty.kind() {
+            ty::Bool
+            | ty::Char
+            | ty::Int(..)
+            | ty::Uint(..)
+            | ty::Float(..)
+            | ty::Array(..)
+            | ty::RawPtr(..)
+            | ty::Ref(..)
+            | ty::FnDef(..)
+            | ty::FnPtr(..)
+            | ty::Closure(..)
+            | ty::Infer(ty::IntVar(..) | ty::FloatVar(..))
+            | ty::Generator(..)
+            | ty::GeneratorWitness(..)
+            | ty::GeneratorWitnessMIR(..)
+            | ty::Never
+            | ty::Foreign(..)
+            | ty::Adt(_, _)
+            | ty::Str
+            | ty::Slice(_)
+            | ty::Dynamic(_, _, _)
+            | ty::Tuple(_)
+            | ty::Error(_) => self_ty.discriminant_ty(ecx.tcx()),
+
+            // We do not call `Ty::discriminant_ty` on alias, param, or placeholder
+            // types, which return `<self_ty as DiscriminantKind>::Discriminant`
+            // (or ICE in the case of placeholders). Projecting a type to itself
+            // is never really productive.
+            ty::Alias(_, _) | ty::Param(_) | ty::Placeholder(..) => {
+                return Err(NoSolution);
+            }
+
+            ty::Infer(ty::TyVar(_) | ty::FreshTy(_) | ty::FreshIntTy(_) | ty::FreshFloatTy(_))
+            | ty::Bound(..) => bug!(
+                "unexpected self ty `{:?}` when normalizing `<T as DiscriminantKind>::Discriminant`",
+                goal.predicate.self_ty()
+            ),
+        };
+
         ecx.probe(|ecx| {
-            ecx.eq(goal.param_env, goal.predicate.term, discriminant.into())?;
+            ecx.eq(goal.param_env, goal.predicate.term, discriminant_ty.into())?;
             ecx.evaluate_added_goals_and_make_canonical_response(Certainty::Yes)
         })
     }

library/alloc/src/collections/vec_deque/mod.rs

@@ -2394,7 +2394,8 @@ impl<T, A: Allocator> VecDeque<T, A> {
     }
 
     /// Binary searches this `VecDeque` for a given element.
-    /// This behaves similarly to [`contains`] if this `VecDeque` is sorted.
+    /// If the `VecDeque` is not sorted, the returned result is unspecified and
+    /// meaningless.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2404,7 +2405,6 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// See also [`binary_search_by`], [`binary_search_by_key`], and [`partition_point`].
     ///
-    /// [`contains`]: VecDeque::contains
     /// [`binary_search_by`]: VecDeque::binary_search_by
     /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
     /// [`partition_point`]: VecDeque::partition_point
@@ -2450,12 +2450,13 @@ impl<T, A: Allocator> VecDeque<T, A> {
     }
 
     /// Binary searches this `VecDeque` with a comparator function.
-    /// This behaves similarly to [`contains`] if this `VecDeque` is sorted.
     ///
-    /// The comparator function should implement an order consistent
-    /// with the sort order of the deque, returning an order code that
-    /// indicates whether its argument is `Less`, `Equal` or `Greater`
-    /// than the desired target.
+    /// The comparator function should return an order code that indicates
+    /// whether its argument is `Less`, `Equal` or `Greater` the desired
+    /// target.
+    /// If the `VecDeque` is not sorted or if the comparator function does not
+    /// implement an order consistent with the sort order of the underlying
+    /// `VecDeque`, the returned result is unspecified and meaningless.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2465,7 +2466,6 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// See also [`binary_search`], [`binary_search_by_key`], and [`partition_point`].
     ///
-    /// [`contains`]: VecDeque::contains
     /// [`binary_search`]: VecDeque::binary_search
     /// [`binary_search_by_key`]: VecDeque::binary_search_by_key
     /// [`partition_point`]: VecDeque::partition_point
@@ -2505,10 +2505,11 @@ impl<T, A: Allocator> VecDeque<T, A> {
     }
 
     /// Binary searches this `VecDeque` with a key extraction function.
-    /// This behaves similarly to [`contains`] if this `VecDeque` is sorted.
     ///
     /// Assumes that the deque is sorted by the key, for instance with
     /// [`make_contiguous().sort_by_key()`] using the same key extraction function.
+    /// If the deque is not sorted by the key, the returned result is
+    /// unspecified and meaningless.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2518,7 +2519,6 @@ impl<T, A: Allocator> VecDeque<T, A> {
     ///
     /// See also [`binary_search`], [`binary_search_by`], and [`partition_point`].
     ///
-    /// [`contains`]: VecDeque::contains
     /// [`make_contiguous().sort_by_key()`]: VecDeque::make_contiguous
     /// [`binary_search`]: VecDeque::binary_search
     /// [`binary_search_by`]: VecDeque::binary_search_by

library/core/src/slice/mod.rs

@@ -2387,7 +2387,8 @@ impl<T> [T] {
     }
 
     /// Binary searches this slice for a given element.
-    /// This behaves similarly to [`contains`] if this slice is sorted.
+    /// If the slice is not sorted, the returned result is unspecified and
+    /// meaningless.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2399,7 +2400,6 @@ impl<T> [T] {
     ///
     /// See also [`binary_search_by`], [`binary_search_by_key`], and [`partition_point`].
     ///
-    /// [`contains`]: slice::contains
     /// [`binary_search_by`]: slice::binary_search_by
     /// [`binary_search_by_key`]: slice::binary_search_by_key
     /// [`partition_point`]: slice::partition_point
@@ -2462,12 +2462,13 @@ impl<T> [T] {
     }
 
     /// Binary searches this slice with a comparator function.
-    /// This behaves similarly to [`contains`] if this slice is sorted.
     ///
-    /// The comparator function should implement an order consistent
-    /// with the sort order of the underlying slice, returning an
-    /// order code that indicates whether its argument is `Less`,
-    /// `Equal` or `Greater` the desired target.
+    /// The comparator function should return an order code that indicates
+    /// whether its argument is `Less`, `Equal` or `Greater` the desired
+    /// target.
+    /// If the slice is not sorted or if the comparator function does not
+    /// implement an order consistent with the sort order of the underlying
+    /// slice, the returned result is unspecified and meaningless.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2479,7 +2480,6 @@ impl<T> [T] {
     ///
     /// See also [`binary_search`], [`binary_search_by_key`], and [`partition_point`].
     ///
-    /// [`contains`]: slice::contains
     /// [`binary_search`]: slice::binary_search
     /// [`binary_search_by_key`]: slice::binary_search_by_key
     /// [`partition_point`]: slice::partition_point
@@ -2548,10 +2548,11 @@ impl<T> [T] {
     }
 
     /// Binary searches this slice with a key extraction function.
-    /// This behaves similarly to [`contains`] if this slice is sorted.
     ///
     /// Assumes that the slice is sorted by the key, for instance with
     /// [`sort_by_key`] using the same key extraction function.
+    /// If the slice is not sorted by the key, the returned result is
+    /// unspecified and meaningless.
     ///
     /// If the value is found then [`Result::Ok`] is returned, containing the
     /// index of the matching element. If there are multiple matches, then any
@@ -2563,7 +2564,6 @@ impl<T> [T] {
     ///
     /// See also [`binary_search`], [`binary_search_by`], and [`partition_point`].
     ///
-    /// [`contains`]: slice::contains
     /// [`sort_by_key`]: slice::sort_by_key
     /// [`binary_search`]: slice::binary_search
     /// [`binary_search_by`]: slice::binary_search_by

src/bootstrap/llvm.rs

@@ -434,11 +434,6 @@ impl Step for Llvm {
             }
         }
 
-        // Workaround for ppc32 lld limitation
-        if target == "powerpc-unknown-freebsd" {
-            ldflags.exe.push(" -fuse-ld=bfd");
-        }
-
         // https://llvm.org/docs/HowToCrossCompileLLVM.html
         if target != builder.config.build {
             let LlvmResult { llvm_config, .. } =

src/doc/rustc/src/platform-support/openharmony.md

@@ -1,4 +1,4 @@
-# `*-linux-ohos*`
+# `*-unknown-linux-ohos`
 
 **Tier: 3**
 

src/tools/compiletest/src/main.rs

@@ -12,6 +12,7 @@ use build_helper::git::{get_git_modified_files, get_git_untracked_files};
 use core::panic;
 use getopts::Options;
 use lazycell::LazyCell;
+use std::collections::BTreeSet;
 use std::ffi::OsString;
 use std::fs;
 use std::io::{self, ErrorKind};
@@ -409,7 +410,9 @@ pub fn run_tests(config: Config) {
 
     let mut tests = Vec::new();
     for c in &configs {
-        make_tests(c, &mut tests);
+        let mut found_paths = BTreeSet::new();
+        make_tests(c, &mut tests, &mut found_paths);
+        check_overlapping_tests(&found_paths);
     }
 
     tests.sort_by(|a, b| a.desc.name.as_slice().cmp(&b.desc.name.as_slice()));
@@ -535,7 +538,11 @@ pub fn test_opts(config: &Config) -> test::TestOpts {
     }
 }
 
-pub fn make_tests(config: &Config, tests: &mut Vec<test::TestDescAndFn>) {
+pub fn make_tests(
+    config: &Config,
+    tests: &mut Vec<test::TestDescAndFn>,
+    found_paths: &mut BTreeSet<PathBuf>,
+) {
     debug!("making tests from {:?}", config.src_base.display());
     let inputs = common_inputs_stamp(config);
     let modified_tests = modified_tests(config, &config.src_base).unwrap_or_else(|err| {
@@ -547,6 +554,7 @@ pub fn make_tests(config: &Config, tests: &mut Vec<test::TestDescAndFn>) {
         &PathBuf::new(),
         &inputs,
         tests,
+        found_paths,
         &modified_tests,
     )
     .unwrap_or_else(|_| panic!("Could not read tests from {}", config.src_base.display()));
@@ -617,6 +625,7 @@ fn collect_tests_from_dir(
     relative_dir_path: &Path,
     inputs: &Stamp,
     tests: &mut Vec<test::TestDescAndFn>,
+    found_paths: &mut BTreeSet<PathBuf>,
     modified_tests: &Vec<PathBuf>,
 ) -> io::Result<()> {
     // Ignore directories that contain a file named `compiletest-ignore-dir`.
@@ -650,6 +659,8 @@ fn collect_tests_from_dir(
         let file_name = file.file_name();
         if is_test(&file_name) && (!config.only_modified || modified_tests.contains(&file_path)) {
             debug!("found test file: {:?}", file_path.display());
+            let rel_test_path = relative_dir_path.join(file_path.file_stem().unwrap());
+            found_paths.insert(rel_test_path);
             let paths =
                 TestPaths { file: file_path, relative_dir: relative_dir_path.to_path_buf() };
 
@@ -664,6 +675,7 @@ fn collect_tests_from_dir(
                     &relative_file_path,
                     inputs,
                     tests,
+                    found_paths,
                     modified_tests,
                 )?;
             }
@@ -1079,3 +1091,24 @@ fn extract_lldb_version(full_version_line: &str) -> Option<(u32, bool)> {
 fn not_a_digit(c: char) -> bool {
     !c.is_digit(10)
 }
+
+fn check_overlapping_tests(found_paths: &BTreeSet<PathBuf>) {
+    let mut collisions = Vec::new();
+    for path in found_paths {
+        for ancestor in path.ancestors().skip(1) {
+            if found_paths.contains(ancestor) {
+                collisions.push((path, ancestor.clone()));
+            }
+        }
+    }
+    if !collisions.is_empty() {
+        let collisions: String = collisions
+            .into_iter()
+            .map(|(path, check_parent)| format!("test {path:?} clashes with {check_parent:?}\n"))
+            .collect();
+        panic!(
+            "{collisions}\n\
+            Tests cannot have overlapping names. Make sure they use unique prefixes."
+        );
+    }
+}

tests/ui/traits/new-solver/float-canonical.rs

@@ -0,0 +1,8 @@
+// compile-flags: -Ztrait-solver=next
+// check-pass
+
+fn foo(x: f64) {
+    let y = x + 1.0;
+}
+
+fn main() {}

tests/ui/traits/new-solver/param-discr-kind.rs

@@ -0,0 +1,8 @@
+// compile-flags: -Ztrait-solver=next
+// check-pass
+
+fn foo<T>(x: T) {
+    std::mem::discriminant(&x);
+}
+
+fn main() {}

tests/ui/traits/new-solver/pointee.rs

@@ -7,17 +7,15 @@ use std::ptr::{DynMetadata, Pointee};
 trait Trait<U> {}
 struct MyDst<T: ?Sized>(T);
 
-fn works<T>() {
-    let _: <T as Pointee>::Metadata = ();
-    let _: <[T] as Pointee>::Metadata = 1_usize;
-    let _: <str as Pointee>::Metadata = 1_usize;
-    let _: <dyn Trait<T> as Pointee>::Metadata = give::<DynMetadata<dyn Trait<T>>>();
-    let _: <MyDst<T> as Pointee>::Metadata = ();
-    let _: <((((([u8],),),),),) as Pointee>::Metadata = 1_usize;
-}
+fn meta_is<T: Pointee<Metadata = U> + ?Sized, U>() {}
 
-fn give<U>() -> U {
-    loop {}
+fn works<T>() {
+    meta_is::<T, ()>();
+    meta_is::<[T], usize>();
+    meta_is::<str, usize>();
+    meta_is::<dyn Trait<T>, DynMetadata<dyn Trait<T>>>();
+    meta_is::<MyDst<T>, ()>();
+    meta_is::<((((([u8],),),),),), usize>();
 }
 
 fn main() {}

tests/ui/traits/new-solver/projection-discr-kind.rs

@@ -0,0 +1,18 @@
+// compile-flags: -Ztrait-solver=next
+
+// Check that `<T::Assoc as DiscriminantKind>::Discriminant` doesn't normalize
+// to itself and cause overflow/ambiguity.
+
+trait Foo {
+    type Assoc;
+}
+
+trait Bar {}
+fn needs_bar(_: impl Bar) {}
+
+fn foo<T: Foo>(x: T::Assoc) {
+    needs_bar(std::mem::discriminant(&x));
+    //~^ ERROR the trait bound `Discriminant<<T as Foo>::Assoc>: Bar` is not satisfied
+}
+
+fn main() {}

tests/ui/traits/new-solver/projection-discr-kind.stderr

@@ -0,0 +1,17 @@
+error[E0277]: the trait bound `Discriminant<<T as Foo>::Assoc>: Bar` is not satisfied
+  --> $DIR/projection-discr-kind.rs:14:15
+   |
+LL |     needs_bar(std::mem::discriminant(&x));
+   |     --------- ^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Bar` is not implemented for `Discriminant<<T as Foo>::Assoc>`
+   |     |
+   |     required by a bound introduced by this call
+   |
+note: required by a bound in `needs_bar`
+  --> $DIR/projection-discr-kind.rs:11:22
+   |
+LL | fn needs_bar(_: impl Bar) {}
+   |                      ^^^ required by this bound in `needs_bar`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.