Rollup of 8 pull requests

compiler/rustc_const_eval/src/interpret/place.rs

@@ -700,8 +700,13 @@ where
             assert_eq!(src.layout.size, dest.layout.size);
         }
 
+        // Setting `nonoverlapping` here only has an effect when we don't hit the fast-path above,
+        // but that should at least match what LLVM does where `memcpy` is also only used when the
+        // type does not have Scalar/ScalarPair layout.
+        // (Or as the `Assign` docs put it, assignments "not producing primitives" must be
+        // non-overlapping.)
         self.mem_copy(
-            src.ptr, src.align, dest.ptr, dest.align, dest_size, /*nonoverlapping*/ false,
+            src.ptr, src.align, dest.ptr, dest.align, dest_size, /*nonoverlapping*/ true,
         )
     }
 

compiler/rustc_hir_analysis/src/variance/mod.rs

@@ -7,7 +7,7 @@ use rustc_arena::DroplessArena;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
 use rustc_middle::query::Providers;
-use rustc_middle::ty::{self, CrateVariancesMap, ImplTraitInTraitData, SubstsRef, Ty, TyCtxt};
+use rustc_middle::ty::{self, CrateVariancesMap, SubstsRef, Ty, TyCtxt};
 use rustc_middle::ty::{TypeSuperVisitable, TypeVisitable};
 use std::ops::ControlFlow;
 
@@ -59,13 +59,6 @@ fn variances_of(tcx: TyCtxt<'_>, item_def_id: LocalDefId) -> &[ty::Variance] {
         DefKind::OpaqueTy | DefKind::ImplTraitPlaceholder => {
             return variance_of_opaque(tcx, item_def_id);
         }
-        DefKind::AssocTy => {
-            if let Some(ImplTraitInTraitData::Trait { .. }) =
-                tcx.opt_rpitit_info(item_def_id.to_def_id())
-            {
-                return variance_of_opaque(tcx, item_def_id);
-            }
-        }
         _ => {}
     }
 
@@ -125,7 +118,8 @@ fn variance_of_opaque(tcx: TyCtxt<'_>, item_def_id: LocalDefId) -> &[ty::Varianc
                 // FIXME(-Zlower-impl-trait-in-trait-to-assoc-ty) check whether this is necessary
                 // at all for RPITITs.
                 ty::Alias(_, ty::AliasTy { def_id, substs, .. })
-                    if self.tcx.is_impl_trait_in_trait(*def_id) =>
+                    if self.tcx.is_impl_trait_in_trait(*def_id)
+                        && !self.tcx.lower_impl_trait_in_trait_to_assoc_ty() =>
                 {
                     self.visit_opaque(*def_id, substs)
                 }

compiler/rustc_hir_typeck/src/pat.rs

@@ -394,8 +394,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let mut pat_ty = ty;
         if let hir::ExprKind::Lit(Spanned { node: ast::LitKind::ByteStr(..), .. }) = lt.kind {
             let expected = self.structurally_resolve_type(span, expected);
-            if let ty::Ref(_, inner_ty, _) = expected.kind()
-                && matches!(inner_ty.kind(), ty::Slice(_))
+            if let ty::Ref(_, inner_ty, _) = *expected.kind()
+                && self.try_structurally_resolve_type(span, inner_ty).is_slice()
             {
                 let tcx = self.tcx;
                 trace!(?lt.hir_id.local_id, "polymorphic byte string lit");

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -473,17 +473,6 @@ where
                 }
             }
 
-            ty::Alias(ty::Projection, proj) if self.tcx.is_impl_trait_in_trait(proj.def_id) => {
-                // Skip lifetime parameters that are not captures.
-                let variances = self.tcx.variances_of(proj.def_id);
-
-                for (v, s) in std::iter::zip(variances, proj.substs.iter()) {
-                    if *v != ty::Variance::Bivariant {
-                        s.visit_with(self);
-                    }
-                }
-            }
-
             _ => {
                 ty.super_visit_with(self);
             }

compiler/rustc_span/src/symbol.rs

@@ -759,7 +759,6 @@ symbols! {
         from_desugaring,
         from_fn,
         from_iter,
-        from_method,
         from_output,
         from_residual,
         from_size_align_unchecked,

compiler/rustc_trait_selection/src/solve/normalize.rs

@@ -167,9 +167,7 @@ impl<'tcx> FallibleTypeFolder<TyCtxt<'tcx>> for NormalizationFolder<'_, 'tcx> {
         // We don't normalize opaque types unless we have
         // `Reveal::All`, even if we're in the defining scope.
         let data = match *ty.kind() {
-            ty::Alias(kind, alias_ty) if kind != ty::Opaque || reveal == Reveal::UserFacing => {
-                alias_ty
-            }
+            ty::Alias(kind, alias_ty) if kind != ty::Opaque || reveal == Reveal::All => alias_ty,
             _ => return ty.try_super_fold_with(self),
         };
 

compiler/rustc_trait_selection/src/traits/error_reporting/on_unimplemented.rs

@@ -41,7 +41,6 @@ pub trait TypeErrCtxtExt<'tcx> {
 static ALLOWED_FORMAT_SYMBOLS: &[Symbol] = &[
     kw::SelfUpper,
     sym::ItemContext,
-    sym::from_method,
     sym::from_desugaring,
     sym::direct,
     sym::cause,
@@ -172,23 +171,6 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
             }
         }
 
-        if let ObligationCauseCode::ItemObligation(item)
-        | ObligationCauseCode::BindingObligation(item, _)
-        | ObligationCauseCode::ExprItemObligation(item, ..)
-        | ObligationCauseCode::ExprBindingObligation(item, ..) = *obligation.cause.code()
-        {
-            // FIXME: maybe also have some way of handling methods
-            // from other traits? That would require name resolution,
-            // which we might want to be some sort of hygienic.
-            //
-            // Currently I'm leaving it for what I need for `try`.
-            if self.tcx.trait_of_item(item) == Some(trait_ref.def_id) {
-                let method = self.tcx.item_name(item);
-                flags.push((sym::from_method, None));
-                flags.push((sym::from_method, Some(method.to_string())));
-            }
-        }
-
         if let Some(k) = obligation.cause.span.desugaring_kind() {
             flags.push((sym::from_desugaring, None));
             flags.push((sym::from_desugaring, Some(format!("{:?}", k))));
@@ -672,7 +654,7 @@ impl<'tcx> OnUnimplementedFormatString {
                             None => {
                                 if let Some(val) = options.get(&s) {
                                     val
-                                } else if s == sym::from_desugaring || s == sym::from_method {
+                                } else if s == sym::from_desugaring {
                                     // don't break messages using these two arguments incorrectly
                                     &empty_string
                                 } else if s == sym::ItemContext {

src/librustdoc/clean/mod.rs

@@ -1479,8 +1479,97 @@ pub(crate) fn clean_middle_assoc_item<'tcx>(
     Item::from_def_id_and_parts(assoc_item.def_id, Some(assoc_item.name), kind, cx)
 }
 
+/// The goal of this function is to return the first `Path` which is not private (ie not private
+/// or `doc(hidden)`). If it's not possible, it'll return the "end type".
+///
+/// If the path is not a re-export or is public, it'll return `None`.
+fn first_non_private(
+    cx: &mut DocContext<'_>,
+    hir_id: hir::HirId,
+    path: &hir::Path<'_>,
+) -> Option<Path> {
+    let (parent_def_id, mut ident) = match &path.segments[..] {
+        [] => return None,
+        // Relative paths are available in the same scope as the owner.
+        [leaf] => (cx.tcx.local_parent(hir_id.owner.def_id), leaf.ident),
+        // So are self paths.
+        [parent, leaf] if parent.ident.name == kw::SelfLower => {
+            (cx.tcx.local_parent(hir_id.owner.def_id), leaf.ident)
+        }
+        // Crate paths are not. We start from the crate root.
+        [parent, leaf] if matches!(parent.ident.name, kw::Crate | kw::PathRoot) => {
+            (LOCAL_CRATE.as_def_id().as_local()?, leaf.ident)
+        }
+        [parent, leaf] if parent.ident.name == kw::Super => {
+            let parent_mod = cx.tcx.parent_module(hir_id);
+            if let Some(super_parent) = cx.tcx.opt_local_parent(parent_mod) {
+                (super_parent, leaf.ident)
+            } else {
+                // If we can't find the parent of the parent, then the parent is already the crate.
+                (LOCAL_CRATE.as_def_id().as_local()?, leaf.ident)
+            }
+        }
+        // Absolute paths are not. We start from the parent of the item.
+        [.., parent, leaf] => (parent.res.opt_def_id()?.as_local()?, leaf.ident),
+    };
+    let target_def_id = path.res.opt_def_id()?;
+    // First we try to get the `DefId` of the item.
+    for child in
+        cx.tcx.module_children_local(parent_def_id).iter().filter(move |c| c.ident == ident)
+    {
+        if let Res::Def(DefKind::Ctor(..), _) | Res::SelfCtor(..) = child.res {
+            continue;
+        }
+
+        if let Some(def_id) = child.res.opt_def_id() && target_def_id == def_id {
+            let mut last_path_res = None;
+            'reexps: for reexp in child.reexport_chain.iter() {
+                if let Some(use_def_id) = reexp.id() &&
+                    let Some(local_use_def_id) = use_def_id.as_local()
+                {
+                    let hir = cx.tcx.hir();
+                    for item_id in hir.module_items(cx.tcx.local_parent(local_use_def_id)) {
+                        let item = hir.item(item_id);
+                        if item.ident == ident && let hir::ItemKind::Use(path, _) = item.kind {
+                            for res in &path.res {
+                                if let Res::Def(DefKind::Ctor(..), _) | Res::SelfCtor(..) = res {
+                                    continue;
+                                }
+                                if !cx.tcx.is_doc_hidden(use_def_id) &&
+                                    cx.tcx.local_visibility(local_use_def_id).is_public() {
+                                    break 'reexps;
+                                }
+                                ident = path.segments.last().unwrap().ident;
+                                last_path_res = Some((path, res));
+                                continue 'reexps;
+                            }
+                        }
+                    }
+                }
+            }
+            if !child.reexport_chain.is_empty() {
+                // So in here, we use the data we gathered from iterating the reexports. If
+                // `last_path_res` is set, it can mean two things:
+                //
+                // 1. We found a public reexport.
+                // 2. We didn't find a public reexport so it's the "end type" path.
+                if let Some((path, res)) = last_path_res {
+                    let path = hir::Path { segments: path.segments, res: *res, span: path.span };
+                    return Some(clean_path(&path, cx));
+                }
+                // If `last_path_res` is `None`, it can mean two things:
+                //
+                // 1. The re-export is public, no need to change anything, just use the path as is.
+                // 2. Nothing was found, so let's just return the original path.
+                return None;
+            }
+        }
+    }
+    None
+}
+
 fn clean_qpath<'tcx>(hir_ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> Type {
-    let hir::Ty { hir_id: _, span, ref kind } = *hir_ty;
+    let hir::Ty { hir_id, span, ref kind } = *hir_ty;
     let hir::TyKind::Path(qpath) = kind else { unreachable!() };
 
     match qpath {
@@ -1497,7 +1586,12 @@ fn clean_qpath<'tcx>(hir_ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> Type
             if let Some(expanded) = maybe_expand_private_type_alias(cx, path) {
                 expanded
             } else {
-                let path = clean_path(path, cx);
+                // First we check if it's a private re-export.
+                let path = if let Some(path) = first_non_private(cx, hir_id, &path) {
+                    path
+                } else {
+                    clean_path(path, cx)
+                };
                 resolve_type(cx, path)
             }
         }
@@ -1649,7 +1743,7 @@ fn maybe_expand_private_type_alias<'tcx>(
         }
     }
 
-    Some(cx.enter_alias(substs, def_id.to_def_id(), |cx| clean_ty(ty, cx)))
+    Some(cx.enter_alias(substs, def_id.to_def_id(), |cx| clean_ty(&ty, cx)))
 }
 
 pub(crate) fn clean_ty<'tcx>(ty: &hir::Ty<'tcx>, cx: &mut DocContext<'tcx>) -> Type {

src/tools/clippy/clippy_lints/src/incorrect_impls.rs

@@ -82,7 +82,7 @@ impl LateLintPass<'_> for IncorrectImpls {
                     cx,
                     hir_ty_to_ty(cx.tcx, imp.self_ty),
                     copy_def_id,
-                    trait_impl.substs,
+                    &[],
                 )
         {
             if impl_item.ident.name == sym::clone {

src/tools/clippy/tests/ui/needless_raw_string.fixed

@@ -10,7 +10,8 @@ fn main() {
     b"aaa";
     br#""aaa""#;
     br#"\s"#;
-    c"aaa";
-    cr#""aaa""#;
-    cr#"\s"#;
+    // currently disabled: https://github.com/rust-lang/rust/issues/113333
+    // cr#"aaa"#;
+    // cr#""aaa""#;
+    // cr#"\s"#;
 }

src/tools/clippy/tests/ui/needless_raw_string.rs

@@ -10,7 +10,8 @@ fn main() {
     br#"aaa"#;
     br#""aaa""#;
     br#"\s"#;
-    cr#"aaa"#;
-    cr#""aaa""#;
-    cr#"\s"#;
+    // currently disabled: https://github.com/rust-lang/rust/issues/113333
+    // cr#"aaa"#;
+    // cr#""aaa""#;
+    // cr#"\s"#;
 }

src/tools/clippy/tests/ui/needless_raw_string.stderr

@@ -12,11 +12,5 @@ error: unnecessary raw string literal
 LL |     br#"aaa"#;
    |     ^^^^^^^^^ help: try: `b"aaa"`
 
-error: unnecessary raw string literal
-  --> $DIR/needless_raw_string.rs:13:5
-   |
-LL |     cr#"aaa"#;
-   |     ^^^^^^^^^ help: try: `c"aaa"`
-
-error: aborting due to 3 previous errors
+error: aborting due to 2 previous errors
 

src/tools/clippy/tests/ui/needless_raw_string_hashes.fixed

@@ -12,8 +12,9 @@ fn main() {
     br#"Hello "world"!"#;
     br####" "### "## "# "####;
     br###" "aa" "# "## "###;
-    cr#"aaa"#;
-    cr#"Hello "world"!"#;
-    cr####" "### "## "# "####;
-    cr###" "aa" "# "## "###;
+    // currently disabled: https://github.com/rust-lang/rust/issues/113333
+    // cr#"aaa"#;
+    // cr##"Hello "world"!"##;
+    // cr######" "### "## "# "######;
+    // cr######" "aa" "# "## "######;
 }

src/tools/clippy/tests/ui/needless_raw_string_hashes.rs

@@ -12,8 +12,9 @@ fn main() {
     br##"Hello "world"!"##;
     br######" "### "## "# "######;
     br######" "aa" "# "## "######;
-    cr#"aaa"#;
-    cr##"Hello "world"!"##;
-    cr######" "### "## "# "######;
-    cr######" "aa" "# "## "######;
+    // currently disabled: https://github.com/rust-lang/rust/issues/113333
+    // cr#"aaa"#;
+    // cr##"Hello "world"!"##;
+    // cr######" "### "## "# "######;
+    // cr######" "aa" "# "## "######;
 }

src/tools/clippy/tests/ui/needless_raw_string_hashes.stderr

@@ -36,23 +36,5 @@ error: unnecessary hashes around raw string literal
 LL |     br######" "aa" "# "## "######;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `br###" "aa" "# "## "###`
 
-error: unnecessary hashes around raw string literal
-  --> $DIR/needless_raw_string_hashes.rs:16:5
-   |
-LL |     cr##"Hello "world"!"##;
-   |     ^^^^^^^^^^^^^^^^^^^^^^ help: try: `cr#"Hello "world"!"#`
-
-error: unnecessary hashes around raw string literal
-  --> $DIR/needless_raw_string_hashes.rs:17:5
-   |
-LL |     cr######" "### "## "# "######;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cr####" "### "## "# "####`
-
-error: unnecessary hashes around raw string literal
-  --> $DIR/needless_raw_string_hashes.rs:18:5
-   |
-LL |     cr######" "aa" "# "## "######;
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `cr###" "aa" "# "## "###`
-
-error: aborting due to 9 previous errors
+error: aborting due to 6 previous errors
 

src/tools/miri/tests/fail/overlapping_assignment.rs

@@ -0,0 +1,23 @@
+#![feature(core_intrinsics)]
+#![feature(custom_mir)]
+
+use std::intrinsics::mir::*;
+
+// It's not that easy to fool the MIR validity check
+// which wants to prevent overlapping assignments...
+// So we use two separate pointer arguments, and then arrange for them to alias.
+#[custom_mir(dialect = "runtime", phase = "optimized")]
+pub fn self_copy(ptr1: *mut [i32; 4], ptr2: *mut [i32; 4]) {
+    mir! {
+        {
+            *ptr1 = *ptr2; //~ERROR: overlapping ranges
+            Return()
+        }
+    }
+}
+
+pub fn main() {
+    let mut x = [0; 4];
+    let ptr = std::ptr::addr_of_mut!(x);
+    self_copy(ptr, ptr);
+}