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-rw-r--r--compiler/rustc_middle/src/ty/consts.rs2
-rw-r--r--compiler/rustc_middle/src/ty/context.rs60
-rw-r--r--compiler/rustc_middle/src/ty/layout.rs8
-rw-r--r--compiler/rustc_middle/src/ty/print/pretty.rs8
-rw-r--r--compiler/rustc_middle/src/ty/region.rs2
-rw-r--r--compiler/rustc_middle/src/ty/sty.rs39
6 files changed, 56 insertions, 63 deletions
diff --git a/compiler/rustc_middle/src/ty/consts.rs b/compiler/rustc_middle/src/ty/consts.rs
index 362ff8e988d..a5952c65692 100644
--- a/compiler/rustc_middle/src/ty/consts.rs
+++ b/compiler/rustc_middle/src/ty/consts.rs
@@ -396,7 +396,7 @@ impl<'tcx> Const<'tcx> {
                         Ok((tcx.type_of(unevaluated.def).instantiate(tcx, unevaluated.args), c))
                     }
                     Ok(Err(bad_ty)) => Err(Either::Left(bad_ty)),
-                    Err(err) => Err(Either::Right(err.into())),
+                    Err(err) => Err(Either::Right(err)),
                 }
             }
             ConstKind::Value(ty, val) => Ok((ty, val)),
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index 5334e767766..5ec7e80ee45 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -181,6 +181,10 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
         }
     }
 
+    fn evaluation_is_concurrent(&self) -> bool {
+        self.sess.threads() > 1
+    }
+
     fn expand_abstract_consts<T: TypeFoldable<TyCtxt<'tcx>>>(self, t: T) -> T {
         self.expand_abstract_consts(t)
     }
@@ -2003,7 +2007,7 @@ impl<'tcx> TyCtxt<'tcx> {
                 ));
             }
         }
-        return None;
+        None
     }
 
     /// Checks if the bound region is in Impl Item.
@@ -2602,33 +2606,31 @@ impl<'tcx> TyCtxt<'tcx> {
     /// With `cfg(debug_assertions)`, assert that args are compatible with their generics,
     /// and print out the args if not.
     pub fn debug_assert_args_compatible(self, def_id: DefId, args: &'tcx [ty::GenericArg<'tcx>]) {
-        if cfg!(debug_assertions) {
-            if !self.check_args_compatible(def_id, args) {
-                if let DefKind::AssocTy = self.def_kind(def_id)
-                    && let DefKind::Impl { of_trait: false } = self.def_kind(self.parent(def_id))
-                {
-                    bug!(
-                        "args not compatible with generics for {}: args={:#?}, generics={:#?}",
-                        self.def_path_str(def_id),
-                        args,
-                        // Make `[Self, GAT_ARGS...]` (this could be simplified)
-                        self.mk_args_from_iter(
-                            [self.types.self_param.into()].into_iter().chain(
-                                self.generics_of(def_id)
-                                    .own_args(ty::GenericArgs::identity_for_item(self, def_id))
-                                    .iter()
-                                    .copied()
-                            )
+        if cfg!(debug_assertions) && !self.check_args_compatible(def_id, args) {
+            if let DefKind::AssocTy = self.def_kind(def_id)
+                && let DefKind::Impl { of_trait: false } = self.def_kind(self.parent(def_id))
+            {
+                bug!(
+                    "args not compatible with generics for {}: args={:#?}, generics={:#?}",
+                    self.def_path_str(def_id),
+                    args,
+                    // Make `[Self, GAT_ARGS...]` (this could be simplified)
+                    self.mk_args_from_iter(
+                        [self.types.self_param.into()].into_iter().chain(
+                            self.generics_of(def_id)
+                                .own_args(ty::GenericArgs::identity_for_item(self, def_id))
+                                .iter()
+                                .copied()
                         )
-                    );
-                } else {
-                    bug!(
-                        "args not compatible with generics for {}: args={:#?}, generics={:#?}",
-                        self.def_path_str(def_id),
-                        args,
-                        ty::GenericArgs::identity_for_item(self, def_id)
-                    );
-                }
+                    )
+                );
+            } else {
+                bug!(
+                    "args not compatible with generics for {}: args={:#?}, generics={:#?}",
+                    self.def_path_str(def_id),
+                    args,
+                    ty::GenericArgs::identity_for_item(self, def_id)
+                );
             }
         }
     }
@@ -3128,11 +3130,11 @@ impl<'tcx> TyCtxt<'tcx> {
     }
 
     pub fn next_trait_solver_globally(self) -> bool {
-        self.sess.opts.unstable_opts.next_solver.globally
+        self.sess.opts.unstable_opts.next_solver.map_or(false, |c| c.globally)
     }
 
     pub fn next_trait_solver_in_coherence(self) -> bool {
-        self.sess.opts.unstable_opts.next_solver.coherence
+        self.sess.opts.unstable_opts.next_solver.map_or(false, |c| c.coherence)
     }
 
     pub fn is_impl_trait_in_trait(self, def_id: DefId) -> bool {
diff --git a/compiler/rustc_middle/src/ty/layout.rs b/compiler/rustc_middle/src/ty/layout.rs
index 8cec8eac189..254a0119920 100644
--- a/compiler/rustc_middle/src/ty/layout.rs
+++ b/compiler/rustc_middle/src/ty/layout.rs
@@ -1183,10 +1183,10 @@ pub fn fn_can_unwind(tcx: TyCtxt<'_>, fn_def_id: Option<DefId>, abi: SpecAbi) ->
         //
         // This is not part of `codegen_fn_attrs` as it can differ between crates
         // and therefore cannot be computed in core.
-        if tcx.sess.opts.unstable_opts.panic_in_drop == PanicStrategy::Abort {
-            if tcx.is_lang_item(did, LangItem::DropInPlace) {
-                return false;
-            }
+        if tcx.sess.opts.unstable_opts.panic_in_drop == PanicStrategy::Abort
+            && tcx.is_lang_item(did, LangItem::DropInPlace)
+        {
+            return false;
         }
     }
 
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index f1ff90831b0..988516d100f 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -1526,7 +1526,7 @@ pub trait PrettyPrinter<'tcx>: Printer<'tcx> + fmt::Write {
 
                 let precedence = |binop: rustc_middle::mir::BinOp| {
                     use rustc_ast::util::parser::AssocOp;
-                    AssocOp::from_ast_binop(binop.to_hir_binop().into()).precedence()
+                    AssocOp::from_ast_binop(binop.to_hir_binop()).precedence()
                 };
                 let op_precedence = precedence(op);
                 let formatted_op = op.to_hir_binop().as_str();
@@ -3361,10 +3361,8 @@ pub fn trimmed_def_paths(tcx: TyCtxt<'_>, (): ()) -> DefIdMap<Symbol> {
                     // name.
                     //
                     // Any stable ordering would be fine here though.
-                    if *v.get() != symbol {
-                        if v.get().as_str() > symbol.as_str() {
-                            v.insert(symbol);
-                        }
+                    if *v.get() != symbol && v.get().as_str() > symbol.as_str() {
+                        v.insert(symbol);
                     }
                 }
                 Vacant(v) => {
diff --git a/compiler/rustc_middle/src/ty/region.rs b/compiler/rustc_middle/src/ty/region.rs
index a2a96105777..44956d5b0a6 100644
--- a/compiler/rustc_middle/src/ty/region.rs
+++ b/compiler/rustc_middle/src/ty/region.rs
@@ -431,7 +431,7 @@ impl BoundRegionKind {
 
     pub fn get_id(&self) -> Option<DefId> {
         match *self {
-            BoundRegionKind::BrNamed(id, _) => return Some(id),
+            BoundRegionKind::BrNamed(id, _) => Some(id),
             _ => None,
         }
     }
diff --git a/compiler/rustc_middle/src/ty/sty.rs b/compiler/rustc_middle/src/ty/sty.rs
index 1f4f2c62d70..44309697ba9 100644
--- a/compiler/rustc_middle/src/ty/sty.rs
+++ b/compiler/rustc_middle/src/ty/sty.rs
@@ -1091,29 +1091,21 @@ impl<'tcx> Ty<'tcx> {
     }
 
     pub fn simd_size_and_type(self, tcx: TyCtxt<'tcx>) -> (u64, Ty<'tcx>) {
-        match self.kind() {
-            Adt(def, args) => {
-                assert!(def.repr().simd(), "`simd_size_and_type` called on non-SIMD type");
-                let variant = def.non_enum_variant();
-                let f0_ty = variant.fields[FieldIdx::ZERO].ty(tcx, args);
-
-                match f0_ty.kind() {
-                    // If the first field is an array, we assume it is the only field and its
-                    // elements are the SIMD components.
-                    Array(f0_elem_ty, f0_len) => {
-                        // FIXME(repr_simd): https://github.com/rust-lang/rust/pull/78863#discussion_r522784112
-                        // The way we evaluate the `N` in `[T; N]` here only works since we use
-                        // `simd_size_and_type` post-monomorphization. It will probably start to ICE
-                        // if we use it in generic code. See the `simd-array-trait` ui test.
-                        (f0_len.eval_target_usize(tcx, ParamEnv::empty()), *f0_elem_ty)
-                    }
-                    // Otherwise, the fields of this Adt are the SIMD components (and we assume they
-                    // all have the same type).
-                    _ => (variant.fields.len() as u64, f0_ty),
-                }
-            }
-            _ => bug!("`simd_size_and_type` called on invalid type"),
-        }
+        let Adt(def, args) = self.kind() else {
+            bug!("`simd_size_and_type` called on invalid type")
+        };
+        assert!(def.repr().simd(), "`simd_size_and_type` called on non-SIMD type");
+        let variant = def.non_enum_variant();
+        assert_eq!(variant.fields.len(), 1);
+        let field_ty = variant.fields[FieldIdx::ZERO].ty(tcx, args);
+        let Array(f0_elem_ty, f0_len) = field_ty.kind() else {
+            bug!("Simd type has non-array field type {field_ty:?}")
+        };
+        // FIXME(repr_simd): https://github.com/rust-lang/rust/pull/78863#discussion_r522784112
+        // The way we evaluate the `N` in `[T; N]` here only works since we use
+        // `simd_size_and_type` post-monomorphization. It will probably start to ICE
+        // if we use it in generic code. See the `simd-array-trait` ui test.
+        (f0_len.eval_target_usize(tcx, ParamEnv::empty()), *f0_elem_ty)
     }
 
     #[inline]
@@ -1136,6 +1128,7 @@ impl<'tcx> Ty<'tcx> {
     }
 
     /// Tests if this is any kind of primitive pointer type (reference, raw pointer, fn pointer).
+    /// `Box` is *not* considered a pointer here!
     #[inline]
     pub fn is_any_ptr(self) -> bool {
         self.is_ref() || self.is_unsafe_ptr() || self.is_fn_ptr()