Rollup of 8 pull requests

Cargo.lock

@@ -4348,6 +4348,7 @@ dependencies = [
  "rustc_span",
  "rustc_target",
  "smallvec",
+ "termize",
  "tracing",
  "winapi",
 ]

compiler/rustc_ast_lowering/src/lib.rs

@@ -259,6 +259,8 @@ enum ImplTraitContext {
     },
     /// Impl trait in type aliases.
     TypeAliasesOpaqueTy,
+    /// `impl Trait` is unstably accepted in this position.
+    FeatureGated(ImplTraitPosition, Symbol),
     /// `impl Trait` is not accepted in this position.
     Disallowed(ImplTraitPosition),
 }
@@ -1372,25 +1374,23 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                         }
                         path
                     }
-                    ImplTraitContext::Disallowed(
-                        position @ (ImplTraitPosition::TraitReturn | ImplTraitPosition::ImplReturn),
-                    ) => {
+                    ImplTraitContext::FeatureGated(position, feature) => {
                         self.tcx
                             .sess
                             .create_feature_err(
                                 MisplacedImplTrait {
                                     span: t.span,
-                                    position: DiagnosticArgFromDisplay(&position),
+                                    position: DiagnosticArgFromDisplay(position),
                                 },
-                                sym::return_position_impl_trait_in_trait,
+                                *feature,
                             )
                             .emit();
                         hir::TyKind::Err
                     }
                     ImplTraitContext::Disallowed(position) => {
                         self.tcx.sess.emit_err(MisplacedImplTrait {
                             span: t.span,
-                            position: DiagnosticArgFromDisplay(&position),
+                            position: DiagnosticArgFromDisplay(position),
                         });
                         hir::TyKind::Err
                     }
@@ -1739,14 +1739,14 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
         } else {
             match &decl.output {
                 FnRetTy::Ty(ty) => {
-                    let mut context = if kind.return_impl_trait_allowed(self.tcx) {
+                    let context = if kind.return_impl_trait_allowed(self.tcx) {
                         let fn_def_id = self.local_def_id(fn_node_id);
                         ImplTraitContext::ReturnPositionOpaqueTy {
                             origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),
                             in_trait: matches!(kind, FnDeclKind::Trait),
                         }
                     } else {
-                        ImplTraitContext::Disallowed(match kind {
+                        let position = match kind {
                             FnDeclKind::Fn | FnDeclKind::Inherent => {
                                 unreachable!("fn should allow in-band lifetimes")
                             }
@@ -1755,9 +1755,16 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                             FnDeclKind::Pointer => ImplTraitPosition::PointerReturn,
                             FnDeclKind::Trait => ImplTraitPosition::TraitReturn,
                             FnDeclKind::Impl => ImplTraitPosition::ImplReturn,
-                        })
+                        };
+                        match kind {
+                            FnDeclKind::Trait | FnDeclKind::Impl => ImplTraitContext::FeatureGated(
+                                position,
+                                sym::return_position_impl_trait_in_trait,
+                            ),
+                            _ => ImplTraitContext::Disallowed(position),
+                        }
                     };
-                    hir::FnRetTy::Return(self.lower_ty(ty, &mut context))
+                    hir::FnRetTy::Return(self.lower_ty(ty, &context))
                 }
                 FnRetTy::Default(span) => hir::FnRetTy::DefaultReturn(self.lower_span(*span)),
             }
@@ -1938,7 +1945,10 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                     output,
                     span,
                     if in_trait && !this.tcx.features().return_position_impl_trait_in_trait {
-                        ImplTraitContext::Disallowed(ImplTraitPosition::TraitReturn)
+                        ImplTraitContext::FeatureGated(
+                            ImplTraitPosition::TraitReturn,
+                            sym::return_position_impl_trait_in_trait,
+                        )
                     } else {
                         ImplTraitContext::ReturnPositionOpaqueTy {
                             origin: hir::OpaqueTyOrigin::FnReturn(fn_def_id),

compiler/rustc_ast_lowering/src/path.rs

@@ -9,7 +9,7 @@ use rustc_ast::{self as ast, *};
 use rustc_hir as hir;
 use rustc_hir::def::{DefKind, PartialRes, Res};
 use rustc_hir::GenericArg;
-use rustc_span::symbol::{kw, Ident};
+use rustc_span::symbol::{kw, sym, Ident};
 use rustc_span::{BytePos, Span, DUMMY_SP};
 
 use smallvec::{smallvec, SmallVec};
@@ -352,11 +352,18 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
             // fn f(_: impl Fn() -> impl Debug) -> impl Fn() -> impl Debug
             // //      disallowed --^^^^^^^^^^        allowed --^^^^^^^^^^
             // ```
-            FnRetTy::Ty(ty)
-                if matches!(itctx, ImplTraitContext::ReturnPositionOpaqueTy { .. })
-                    && self.tcx.features().impl_trait_in_fn_trait_return =>
-            {
-                self.lower_ty(&ty, itctx)
+            FnRetTy::Ty(ty) if matches!(itctx, ImplTraitContext::ReturnPositionOpaqueTy { .. }) => {
+                if self.tcx.features().impl_trait_in_fn_trait_return {
+                    self.lower_ty(&ty, itctx)
+                } else {
+                    self.lower_ty(
+                        &ty,
+                        &ImplTraitContext::FeatureGated(
+                            ImplTraitPosition::FnTraitReturn,
+                            sym::impl_trait_in_fn_trait_return,
+                        ),
+                    )
+                }
             }
             FnRetTy::Ty(ty) => {
                 self.lower_ty(&ty, &ImplTraitContext::Disallowed(ImplTraitPosition::FnTraitReturn))

compiler/rustc_const_eval/src/interpret/machine.rs

@@ -373,9 +373,21 @@ pub trait Machine<'mir, 'tcx>: Sized {
         Ok(())
     }
 
-    /// Executes a retagging operation.
+    /// Executes a retagging operation for a single pointer.
+    /// Returns the possibly adjusted pointer.
     #[inline]
-    fn retag(
+    fn retag_ptr_value(
+        _ecx: &mut InterpCx<'mir, 'tcx, Self>,
+        _kind: mir::RetagKind,
+        val: &ImmTy<'tcx, Self::Provenance>,
+    ) -> InterpResult<'tcx, ImmTy<'tcx, Self::Provenance>> {
+        Ok(val.clone())
+    }
+
+    /// Executes a retagging operation on a compound value.
+    /// Replaces all pointers stored in the given place.
+    #[inline]
+    fn retag_place_contents(
         _ecx: &mut InterpCx<'mir, 'tcx, Self>,
         _kind: mir::RetagKind,
         _place: &PlaceTy<'tcx, Self::Provenance>,

compiler/rustc_const_eval/src/interpret/step.rs

@@ -8,7 +8,7 @@ use rustc_middle::mir;
 use rustc_middle::mir::interpret::{InterpResult, Scalar};
 use rustc_middle::ty::layout::LayoutOf;
 
-use super::{InterpCx, Machine};
+use super::{ImmTy, InterpCx, Machine};
 
 /// Classify whether an operator is "left-homogeneous", i.e., the LHS has the
 /// same type as the result.
@@ -108,7 +108,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             // Stacked Borrows.
             Retag(kind, place) => {
                 let dest = self.eval_place(**place)?;
-                M::retag(self, *kind, &dest)?;
+                M::retag_place_contents(self, *kind, &dest)?;
             }
 
             Intrinsic(box ref intrinsic) => self.emulate_nondiverging_intrinsic(intrinsic)?,
@@ -247,10 +247,41 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 self.write_scalar(Scalar::from_machine_usize(len, self), &dest)?;
             }
 
-            AddressOf(_, place) | Ref(_, _, place) => {
+            Ref(_, borrow_kind, place) => {
                 let src = self.eval_place(place)?;
                 let place = self.force_allocation(&src)?;
-                self.write_immediate(place.to_ref(self), &dest)?;
+                let val = ImmTy::from_immediate(place.to_ref(self), dest.layout);
+                // A fresh reference was created, make sure it gets retagged.
+                let val = M::retag_ptr_value(
+                    self,
+                    if borrow_kind.allows_two_phase_borrow() {
+                        mir::RetagKind::TwoPhase
+                    } else {
+                        mir::RetagKind::Default
+                    },
+                    &val,
+                )?;
+                self.write_immediate(*val, &dest)?;
+            }
+
+            AddressOf(_, place) => {
+                // Figure out whether this is an addr_of of an already raw place.
+                let place_base_raw = if place.has_deref() {
+                    let ty = self.frame().body.local_decls[place.local].ty;
+                    ty.is_unsafe_ptr()
+                } else {
+                    // Not a deref, and thus not raw.
+                    false
+                };
+
+                let src = self.eval_place(place)?;
+                let place = self.force_allocation(&src)?;
+                let mut val = ImmTy::from_immediate(place.to_ref(self), dest.layout);
+                if !place_base_raw {
+                    // If this was not already raw, it needs retagging.
+                    val = M::retag_ptr_value(self, mir::RetagKind::Raw, &val)?;
+                }
+                self.write_immediate(*val, &dest)?;
             }
 
             NullaryOp(null_op, ty) => {

compiler/rustc_hir_analysis/src/collect/generics_of.rs

@@ -4,7 +4,6 @@ use hir::{
     GenericParamKind, HirId, Node,
 };
 use rustc_hir as hir;
-use rustc_hir::def::DefKind;
 use rustc_hir::def_id::DefId;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_session::lint;
@@ -143,20 +142,7 @@ pub(super) fn generics_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::Generics {
             Some(tcx.typeck_root_def_id(def_id))
         }
         Node::Item(item) => match item.kind {
-            ItemKind::OpaqueTy(hir::OpaqueTy {
-                origin:
-                    hir::OpaqueTyOrigin::FnReturn(fn_def_id) | hir::OpaqueTyOrigin::AsyncFn(fn_def_id),
-                in_trait,
-                ..
-            }) => {
-                if in_trait {
-                    assert!(matches!(tcx.def_kind(fn_def_id), DefKind::AssocFn))
-                } else {
-                    assert!(matches!(tcx.def_kind(fn_def_id), DefKind::AssocFn | DefKind::Fn))
-                }
-                Some(fn_def_id.to_def_id())
-            }
-            ItemKind::OpaqueTy(hir::OpaqueTy { origin: hir::OpaqueTyOrigin::TyAlias, .. }) => {
+            ItemKind::OpaqueTy(hir::OpaqueTy { .. }) => {
                 let parent_id = tcx.hir().get_parent_item(hir_id);
                 assert_ne!(parent_id, hir::CRATE_OWNER_ID);
                 debug!("generics_of: parent of opaque ty {:?} is {:?}", def_id, parent_id);