diff --git a/compiler/rustc_borrowck/src/borrow_set.rs b/compiler/rustc_borrowck/src/borrow_set.rs
index 0b44beeb004c4..5248a649c3493 100644
--- a/compiler/rustc_borrowck/src/borrow_set.rs
+++ b/compiler/rustc_borrowck/src/borrow_set.rs
@@ -71,7 +71,7 @@ impl<'tcx> fmt::Display for BorrowData<'tcx> {
     fn fmt(&self, w: &mut fmt::Formatter<'_>) -> fmt::Result {
         let kind = match self.kind {
             mir::BorrowKind::Shared => "",
-            mir::BorrowKind::Shallow => "shallow ",
+            mir::BorrowKind::Fake => "fake ",
             mir::BorrowKind::Mut { kind: mir::MutBorrowKind::ClosureCapture } => "uniq ",
             // FIXME: differentiate `TwoPhaseBorrow`
             mir::BorrowKind::Mut {
diff --git a/compiler/rustc_borrowck/src/def_use.rs b/compiler/rustc_borrowck/src/def_use.rs
index 201f0df123879..d0cf339e7ba41 100644
--- a/compiler/rustc_borrowck/src/def_use.rs
+++ b/compiler/rustc_borrowck/src/def_use.rs
@@ -49,7 +49,7 @@ pub fn categorize(context: PlaceContext) -> Option<DefUse> {
         // cross suspension points so this behavior is unproblematic.
         PlaceContext::MutatingUse(MutatingUseContext::Borrow) |
         PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow) |
-        PlaceContext::NonMutatingUse(NonMutatingUseContext::ShallowBorrow) |
+        PlaceContext::NonMutatingUse(NonMutatingUseContext::FakeBorrow) |
 
         // `PlaceMention` and `AscribeUserType` both evaluate the place, which must not
         // contain dangling references.
diff --git a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
index 247200dcd2695..9a8f1c97edf45 100644
--- a/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs
@@ -1022,7 +1022,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 self.cannot_uniquely_borrow_by_two_closures(span, &desc_place, issued_span, None)
             }
 
-            (BorrowKind::Mut { .. }, BorrowKind::Shallow) => {
+            (BorrowKind::Mut { .. }, BorrowKind::Fake) => {
                 if let Some(immutable_section_description) =
                     self.classify_immutable_section(issued_borrow.assigned_place)
                 {
@@ -1114,11 +1114,10 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 )
             }
 
-            (BorrowKind::Shared, BorrowKind::Shared | BorrowKind::Shallow)
-            | (
-                BorrowKind::Shallow,
-                BorrowKind::Mut { .. } | BorrowKind::Shared | BorrowKind::Shallow,
-            ) => unreachable!(),
+            (BorrowKind::Shared, BorrowKind::Shared | BorrowKind::Fake)
+            | (BorrowKind::Fake, BorrowKind::Mut { .. } | BorrowKind::Shared | BorrowKind::Fake) => {
+                unreachable!()
+            }
         };
 
         if issued_spans == borrow_spans {
@@ -2806,7 +2805,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         let loan_span = loan_spans.args_or_use();
 
         let descr_place = self.describe_any_place(place.as_ref());
-        if loan.kind == BorrowKind::Shallow {
+        if loan.kind == BorrowKind::Fake {
             if let Some(section) = self.classify_immutable_section(loan.assigned_place) {
                 let mut err = self.cannot_mutate_in_immutable_section(
                     span,
diff --git a/compiler/rustc_borrowck/src/diagnostics/mod.rs b/compiler/rustc_borrowck/src/diagnostics/mod.rs
index 4b95b4783eb4b..c4323fef93558 100644
--- a/compiler/rustc_borrowck/src/diagnostics/mod.rs
+++ b/compiler/rustc_borrowck/src/diagnostics/mod.rs
@@ -634,7 +634,7 @@ impl UseSpans<'_> {
                 err.subdiagnostic(match kind {
                     Some(kd) => match kd {
                         rustc_middle::mir::BorrowKind::Shared
-                        | rustc_middle::mir::BorrowKind::Shallow => {
+                        | rustc_middle::mir::BorrowKind::Fake => {
                             CaptureVarKind::Immut { kind_span: capture_kind_span }
                         }
 
diff --git a/compiler/rustc_borrowck/src/invalidation.rs b/compiler/rustc_borrowck/src/invalidation.rs
index 7b5b52e39b121..ec6d7b74e61ac 100644
--- a/compiler/rustc_borrowck/src/invalidation.rs
+++ b/compiler/rustc_borrowck/src/invalidation.rs
@@ -253,8 +253,8 @@ impl<'cx, 'tcx> InvalidationGenerator<'cx, 'tcx> {
         match rvalue {
             &Rvalue::Ref(_ /*rgn*/, bk, place) => {
                 let access_kind = match bk {
-                    BorrowKind::Shallow => {
-                        (Shallow(Some(ArtificialField::ShallowBorrow)), Read(ReadKind::Borrow(bk)))
+                    BorrowKind::Fake => {
+                        (Shallow(Some(ArtificialField::FakeBorrow)), Read(ReadKind::Borrow(bk)))
                     }
                     BorrowKind::Shared => (Deep, Read(ReadKind::Borrow(bk))),
                     BorrowKind::Mut { .. } => {
@@ -376,8 +376,8 @@ impl<'cx, 'tcx> InvalidationGenerator<'cx, 'tcx> {
                         // have already taken the reservation
                     }
 
-                    (Read(_), BorrowKind::Shallow | BorrowKind::Shared)
-                    | (Read(ReadKind::Borrow(BorrowKind::Shallow)), BorrowKind::Mut { .. }) => {
+                    (Read(_), BorrowKind::Fake | BorrowKind::Shared)
+                    | (Read(ReadKind::Borrow(BorrowKind::Fake)), BorrowKind::Mut { .. }) => {
                         // Reads don't invalidate shared or shallow borrows
                     }
 
@@ -422,7 +422,7 @@ impl<'cx, 'tcx> InvalidationGenerator<'cx, 'tcx> {
 
             // only mutable borrows should be 2-phase
             assert!(match borrow.kind {
-                BorrowKind::Shared | BorrowKind::Shallow => false,
+                BorrowKind::Shared | BorrowKind::Fake => false,
                 BorrowKind::Mut { .. } => true,
             });
 
diff --git a/compiler/rustc_borrowck/src/lib.rs b/compiler/rustc_borrowck/src/lib.rs
index 1a74582389d1e..5787ea13e7939 100644
--- a/compiler/rustc_borrowck/src/lib.rs
+++ b/compiler/rustc_borrowck/src/lib.rs
@@ -846,7 +846,7 @@ use self::ReadOrWrite::{Activation, Read, Reservation, Write};
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
 enum ArtificialField {
     ArrayLength,
-    ShallowBorrow,
+    FakeBorrow,
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, Debug)]
@@ -1085,18 +1085,18 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     Control::Continue
                 }
 
-                (Read(_), BorrowKind::Shared | BorrowKind::Shallow)
-                | (Read(ReadKind::Borrow(BorrowKind::Shallow)), BorrowKind::Mut { .. }) => {
+                (Read(_), BorrowKind::Shared | BorrowKind::Fake)
+                | (Read(ReadKind::Borrow(BorrowKind::Fake)), BorrowKind::Mut { .. }) => {
                     Control::Continue
                 }
 
-                (Reservation(_), BorrowKind::Shallow | BorrowKind::Shared) => {
+                (Reservation(_), BorrowKind::Fake | BorrowKind::Shared) => {
                     // This used to be a future compatibility warning (to be
                     // disallowed on NLL). See rust-lang/rust#56254
                     Control::Continue
                 }
 
-                (Write(WriteKind::Move), BorrowKind::Shallow) => {
+                (Write(WriteKind::Move), BorrowKind::Fake) => {
                     // Handled by initialization checks.
                     Control::Continue
                 }
@@ -1204,8 +1204,8 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         match rvalue {
             &Rvalue::Ref(_ /*rgn*/, bk, place) => {
                 let access_kind = match bk {
-                    BorrowKind::Shallow => {
-                        (Shallow(Some(ArtificialField::ShallowBorrow)), Read(ReadKind::Borrow(bk)))
+                    BorrowKind::Fake => {
+                        (Shallow(Some(ArtificialField::FakeBorrow)), Read(ReadKind::Borrow(bk)))
                     }
                     BorrowKind::Shared => (Deep, Read(ReadKind::Borrow(bk))),
                     BorrowKind::Mut { .. } => {
@@ -1226,7 +1226,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                     flow_state,
                 );
 
-                let action = if bk == BorrowKind::Shallow {
+                let action = if bk == BorrowKind::Fake {
                     InitializationRequiringAction::MatchOn
                 } else {
                     InitializationRequiringAction::Borrow
@@ -1583,7 +1583,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
             // only mutable borrows should be 2-phase
             assert!(match borrow.kind {
-                BorrowKind::Shared | BorrowKind::Shallow => false,
+                BorrowKind::Shared | BorrowKind::Fake => false,
                 BorrowKind::Mut { .. } => true,
             });
 
@@ -2142,14 +2142,14 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 | WriteKind::Replace
                 | WriteKind::StorageDeadOrDrop
                 | WriteKind::MutableBorrow(BorrowKind::Shared)
-                | WriteKind::MutableBorrow(BorrowKind::Shallow),
+                | WriteKind::MutableBorrow(BorrowKind::Fake),
             )
             | Write(
                 WriteKind::Move
                 | WriteKind::Replace
                 | WriteKind::StorageDeadOrDrop
                 | WriteKind::MutableBorrow(BorrowKind::Shared)
-                | WriteKind::MutableBorrow(BorrowKind::Shallow),
+                | WriteKind::MutableBorrow(BorrowKind::Fake),
             ) => {
                 if self.is_mutable(place.as_ref(), is_local_mutation_allowed).is_err()
                     && !self.has_buffered_errors()
@@ -2173,7 +2173,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
                 return false;
             }
             Read(
-                ReadKind::Borrow(BorrowKind::Mut { .. } | BorrowKind::Shared | BorrowKind::Shallow)
+                ReadKind::Borrow(BorrowKind::Mut { .. } | BorrowKind::Shared | BorrowKind::Fake)
                 | ReadKind::Copy,
             ) => {
                 // Access authorized
diff --git a/compiler/rustc_borrowck/src/places_conflict.rs b/compiler/rustc_borrowck/src/places_conflict.rs
index 539d0837659c8..777ebf0d438dc 100644
--- a/compiler/rustc_borrowck/src/places_conflict.rs
+++ b/compiler/rustc_borrowck/src/places_conflict.rs
@@ -204,7 +204,7 @@ fn place_components_conflict<'tcx>(
 
             match (elem, &base_ty.kind(), access) {
                 (_, _, Shallow(Some(ArtificialField::ArrayLength)))
-                | (_, _, Shallow(Some(ArtificialField::ShallowBorrow))) => {
+                | (_, _, Shallow(Some(ArtificialField::FakeBorrow))) => {
                     // The array length is like additional fields on the
                     // type; it does not overlap any existing data there.
                     // Furthermore, if cannot actually be a prefix of any
@@ -273,10 +273,10 @@ fn place_components_conflict<'tcx>(
     // If the second example, where we did, then we still know
     // that the borrow can access a *part* of our place that
     // our access cares about, so we still have a conflict.
-    if borrow_kind == BorrowKind::Shallow
+    if borrow_kind == BorrowKind::Fake
         && borrow_place.projection.len() < access_place.projection.len()
     {
-        debug!("borrow_conflicts_with_place: shallow borrow");
+        debug!("borrow_conflicts_with_place: fake borrow");
         false
     } else {
         debug!("borrow_conflicts_with_place: full borrow, CONFLICT");
diff --git a/compiler/rustc_borrowck/src/type_check/mod.rs b/compiler/rustc_borrowck/src/type_check/mod.rs
index 9f30d9d8ba12b..608d010394f66 100644
--- a/compiler/rustc_borrowck/src/type_check/mod.rs
+++ b/compiler/rustc_borrowck/src/type_check/mod.rs
@@ -751,7 +751,7 @@ impl<'a, 'b, 'tcx> TypeVerifier<'a, 'b, 'tcx> {
             PlaceContext::MutatingUse(_) => ty::Invariant,
             PlaceContext::NonUse(StorageDead | StorageLive | VarDebugInfo) => ty::Invariant,
             PlaceContext::NonMutatingUse(
-                Inspect | Copy | Move | PlaceMention | SharedBorrow | ShallowBorrow | AddressOf
+                Inspect | Copy | Move | PlaceMention | SharedBorrow | FakeBorrow | AddressOf
                 | Projection,
             ) => ty::Covariant,
             PlaceContext::NonUse(AscribeUserTy(variance)) => variance,
diff --git a/compiler/rustc_codegen_ssa/src/mir/analyze.rs b/compiler/rustc_codegen_ssa/src/mir/analyze.rs
index 53cc063e55a54..2285e7f4e01e9 100644
--- a/compiler/rustc_codegen_ssa/src/mir/analyze.rs
+++ b/compiler/rustc_codegen_ssa/src/mir/analyze.rs
@@ -219,7 +219,7 @@ impl<'mir, 'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> Visitor<'tcx>
             | PlaceContext::NonMutatingUse(
                 NonMutatingUseContext::Inspect
                 | NonMutatingUseContext::SharedBorrow
-                | NonMutatingUseContext::ShallowBorrow
+                | NonMutatingUseContext::FakeBorrow
                 | NonMutatingUseContext::AddressOf
                 | NonMutatingUseContext::Projection,
             ) => {
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/check.rs b/compiler/rustc_const_eval/src/transform/check_consts/check.rs
index 135c99fefbc85..76116e339859a 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/check.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/check.rs
@@ -423,8 +423,8 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                         BorrowKind::Shared => {
                             PlaceContext::NonMutatingUse(NonMutatingUseContext::SharedBorrow)
                         }
-                        BorrowKind::Shallow => {
-                            PlaceContext::NonMutatingUse(NonMutatingUseContext::ShallowBorrow)
+                        BorrowKind::Fake => {
+                            PlaceContext::NonMutatingUse(NonMutatingUseContext::FakeBorrow)
                         }
                         BorrowKind::Mut { .. } => {
                             PlaceContext::MutatingUse(MutatingUseContext::Borrow)
@@ -500,7 +500,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                 self.check_mut_borrow(place.local, hir::BorrowKind::Raw)
             }
 
-            Rvalue::Ref(_, BorrowKind::Shared | BorrowKind::Shallow, place)
+            Rvalue::Ref(_, BorrowKind::Shared | BorrowKind::Fake, place)
             | Rvalue::AddressOf(Mutability::Not, place) => {
                 let borrowed_place_has_mut_interior = qualifs::in_place::<HasMutInterior, _>(
                     &self.ccx,
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs b/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
index a137f84b73824..a23922c778ff0 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/resolver.rs
@@ -105,7 +105,7 @@ where
     fn ref_allows_mutation(&self, kind: mir::BorrowKind, place: mir::Place<'tcx>) -> bool {
         match kind {
             mir::BorrowKind::Mut { .. } => true,
-            mir::BorrowKind::Shared | mir::BorrowKind::Shallow => {
+            mir::BorrowKind::Shared | mir::BorrowKind::Fake => {
                 self.shared_borrow_allows_mutation(place)
             }
         }
diff --git a/compiler/rustc_const_eval/src/transform/promote_consts.rs b/compiler/rustc_const_eval/src/transform/promote_consts.rs
index 0590297663873..32af537e271dd 100644
--- a/compiler/rustc_const_eval/src/transform/promote_consts.rs
+++ b/compiler/rustc_const_eval/src/transform/promote_consts.rs
@@ -456,7 +456,7 @@ impl<'tcx> Validator<'_, 'tcx> {
         match kind {
             // Reject these borrow types just to be safe.
             // FIXME(RalfJung): could we allow them? Should we? No point in it until we have a usecase.
-            BorrowKind::Shallow | BorrowKind::Mut { kind: MutBorrowKind::ClosureCapture } => {
+            BorrowKind::Fake | BorrowKind::Mut { kind: MutBorrowKind::ClosureCapture } => {
                 return Err(Unpromotable);
             }
 
diff --git a/compiler/rustc_const_eval/src/transform/validate.rs b/compiler/rustc_const_eval/src/transform/validate.rs
index 4d71f76366768..5922922d47b66 100644
--- a/compiler/rustc_const_eval/src/transform/validate.rs
+++ b/compiler/rustc_const_eval/src/transform/validate.rs
@@ -848,11 +848,11 @@ impl<'a, 'tcx> Visitor<'tcx> for TypeChecker<'a, 'tcx> {
         }
         match rvalue {
             Rvalue::Use(_) | Rvalue::CopyForDeref(_) | Rvalue::Aggregate(..) => {}
-            Rvalue::Ref(_, BorrowKind::Shallow, _) => {
+            Rvalue::Ref(_, BorrowKind::Fake, _) => {
                 if self.mir_phase >= MirPhase::Runtime(RuntimePhase::Initial) {
                     self.fail(
                         location,
-                        "`Assign` statement with a `Shallow` borrow should have been removed in runtime MIR",
+                        "`Assign` statement with a `Fake` borrow should have been removed in runtime MIR",
                     );
                 }
             }
diff --git a/compiler/rustc_middle/src/mir/pretty.rs b/compiler/rustc_middle/src/mir/pretty.rs
index debd85dad2e02..a1324858416ac 100644
--- a/compiler/rustc_middle/src/mir/pretty.rs
+++ b/compiler/rustc_middle/src/mir/pretty.rs
@@ -942,7 +942,7 @@ impl<'tcx> Debug for Rvalue<'tcx> {
             Ref(region, borrow_kind, ref place) => {
                 let kind_str = match borrow_kind {
                     BorrowKind::Shared => "",
-                    BorrowKind::Shallow => "shallow ",
+                    BorrowKind::Fake => "fake ",
                     BorrowKind::Mut { .. } => "mut ",
                 };
 
diff --git a/compiler/rustc_middle/src/mir/statement.rs b/compiler/rustc_middle/src/mir/statement.rs
index 5864acaed7b23..3471d620ee690 100644
--- a/compiler/rustc_middle/src/mir/statement.rs
+++ b/compiler/rustc_middle/src/mir/statement.rs
@@ -446,7 +446,7 @@ impl<'tcx> Rvalue<'tcx> {
 impl BorrowKind {
     pub fn mutability(&self) -> Mutability {
         match *self {
-            BorrowKind::Shared | BorrowKind::Shallow => Mutability::Not,
+            BorrowKind::Shared | BorrowKind::Fake => Mutability::Not,
             BorrowKind::Mut { .. } => Mutability::Mut,
         }
     }
@@ -454,7 +454,7 @@ impl BorrowKind {
     pub fn allows_two_phase_borrow(&self) -> bool {
         match *self {
             BorrowKind::Shared
-            | BorrowKind::Shallow
+            | BorrowKind::Fake
             | BorrowKind::Mut { kind: MutBorrowKind::Default | MutBorrowKind::ClosureCapture } => {
                 false
             }
diff --git a/compiler/rustc_middle/src/mir/syntax.rs b/compiler/rustc_middle/src/mir/syntax.rs
index b6543affc6dbe..7b0f27f9b348c 100644
--- a/compiler/rustc_middle/src/mir/syntax.rs
+++ b/compiler/rustc_middle/src/mir/syntax.rs
@@ -123,7 +123,7 @@ pub enum AnalysisPhase {
     /// * [`TerminatorKind::FalseEdge`]
     /// * [`StatementKind::FakeRead`]
     /// * [`StatementKind::AscribeUserType`]
-    /// * [`Rvalue::Ref`] with `BorrowKind::Shallow`
+    /// * [`Rvalue::Ref`] with `BorrowKind::Fake`
     ///
     /// Furthermore, `Deref` projections must be the first projection within any place (if they
     /// appear at all)
@@ -182,7 +182,7 @@ pub enum BorrowKind {
     /// should not prevent `if let None = x { ... }`, for example, because the
     /// mutating `(*x as Some).0` can't affect the discriminant of `x`.
     /// We can also report errors with this kind of borrow differently.
-    Shallow,
+    Fake,
 
     /// Data is mutable and not aliasable.
     Mut { kind: MutBorrowKind },
diff --git a/compiler/rustc_middle/src/mir/tcx.rs b/compiler/rustc_middle/src/mir/tcx.rs
index 931ee7fd05ef7..6ab2da23a8ad1 100644
--- a/compiler/rustc_middle/src/mir/tcx.rs
+++ b/compiler/rustc_middle/src/mir/tcx.rs
@@ -278,7 +278,7 @@ impl BorrowKind {
 
             // We have no type corresponding to a shallow borrow, so use
             // `&` as an approximation.
-            BorrowKind::Shallow => hir::Mutability::Not,
+            BorrowKind::Fake => hir::Mutability::Not,
         }
     }
 }
diff --git a/compiler/rustc_middle/src/mir/visit.rs b/compiler/rustc_middle/src/mir/visit.rs
index 0f0ca3a1420e9..d47cfd5712f8b 100644
--- a/compiler/rustc_middle/src/mir/visit.rs
+++ b/compiler/rustc_middle/src/mir/visit.rs
@@ -649,8 +649,8 @@ macro_rules! make_mir_visitor {
                             BorrowKind::Shared => PlaceContext::NonMutatingUse(
                                 NonMutatingUseContext::SharedBorrow
                             ),
-                            BorrowKind::Shallow => PlaceContext::NonMutatingUse(
-                                NonMutatingUseContext::ShallowBorrow
+                            BorrowKind::Fake => PlaceContext::NonMutatingUse(
+                                NonMutatingUseContext::FakeBorrow
                             ),
                             BorrowKind::Mut { .. } =>
                                 PlaceContext::MutatingUse(MutatingUseContext::Borrow),
@@ -1261,8 +1261,8 @@ pub enum NonMutatingUseContext {
     Move,
     /// Shared borrow.
     SharedBorrow,
-    /// Shallow borrow.
-    ShallowBorrow,
+    /// A fake borrow.
+    FakeBorrow,
     /// AddressOf for *const pointer.
     AddressOf,
     /// PlaceMention statement.
@@ -1341,7 +1341,7 @@ impl PlaceContext {
         matches!(
             self,
             PlaceContext::NonMutatingUse(
-                NonMutatingUseContext::SharedBorrow | NonMutatingUseContext::ShallowBorrow
+                NonMutatingUseContext::SharedBorrow | NonMutatingUseContext::FakeBorrow
             ) | PlaceContext::MutatingUse(MutatingUseContext::Borrow)
         )
     }
diff --git a/compiler/rustc_mir_build/src/build/expr/as_place.rs b/compiler/rustc_mir_build/src/build/expr/as_place.rs
index c6a09f6568a5e..7e9191a37d32d 100644
--- a/compiler/rustc_mir_build/src/build/expr/as_place.rs
+++ b/compiler/rustc_mir_build/src/build/expr/as_place.rs
@@ -690,7 +690,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
                             fake_borrow_temp.into(),
                             Rvalue::Ref(
                                 tcx.lifetimes.re_erased,
-                                BorrowKind::Shallow,
+                                BorrowKind::Fake,
                                 Place { local: base_place.local, projection },
                             ),
                         );
diff --git a/compiler/rustc_mir_build/src/build/matches/mod.rs b/compiler/rustc_mir_build/src/build/matches/mod.rs
index a43aae6f44942..304870274ac6d 100644
--- a/compiler/rustc_mir_build/src/build/matches/mod.rs
+++ b/compiler/rustc_mir_build/src/build/matches/mod.rs
@@ -2021,7 +2021,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             let re_erased = tcx.lifetimes.re_erased;
             let scrutinee_source_info = self.source_info(scrutinee_span);
             for &(place, temp) in fake_borrows {
-                let borrow = Rvalue::Ref(re_erased, BorrowKind::Shallow, place);
+                let borrow = Rvalue::Ref(re_erased, BorrowKind::Fake, place);
                 self.cfg.push_assign(block, scrutinee_source_info, Place::from(temp), borrow);
             }
 
diff --git a/compiler/rustc_mir_build/src/check_unsafety.rs b/compiler/rustc_mir_build/src/check_unsafety.rs
index 3d895c131a85c..fcb5636078288 100644
--- a/compiler/rustc_mir_build/src/check_unsafety.rs
+++ b/compiler/rustc_mir_build/src/check_unsafety.rs
@@ -288,7 +288,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
                         );
                     };
                     match borrow_kind {
-                        BorrowKind::Shallow | BorrowKind::Shared => {
+                        BorrowKind::Fake | BorrowKind::Shared => {
                             if !ty.is_freeze(self.tcx, self.param_env) {
                                 self.requires_unsafe(pat.span, BorrowOfLayoutConstrainedField);
                             }
@@ -483,7 +483,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
                 visit::walk_expr(&mut visitor, expr);
                 if visitor.found {
                     match borrow_kind {
-                        BorrowKind::Shallow | BorrowKind::Shared
+                        BorrowKind::Fake | BorrowKind::Shared
                             if !self.thir[arg].ty.is_freeze(self.tcx, self.param_env) =>
                         {
                             self.requires_unsafe(expr.span, BorrowOfLayoutConstrainedField)
@@ -491,7 +491,7 @@ impl<'a, 'tcx> Visitor<'a, 'tcx> for UnsafetyVisitor<'a, 'tcx> {
                         BorrowKind::Mut { .. } => {
                             self.requires_unsafe(expr.span, MutationOfLayoutConstrainedField)
                         }
-                        BorrowKind::Shallow | BorrowKind::Shared => {}
+                        BorrowKind::Fake | BorrowKind::Shared => {}
                     }
                 }
             }
diff --git a/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs b/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs
index 1e8e09ac333b1..01acc380fa39c 100644
--- a/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs
+++ b/compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs
@@ -5,7 +5,8 @@ use rustc_middle::mir::*;
 use crate::{AnalysisDomain, GenKill, GenKillAnalysis};
 
 /// A dataflow analysis that tracks whether a pointer or reference could possibly exist that points
-/// to a given local.
+/// to a given local. This analysis ignores fake borrows, so it should not be used by
+/// borrowck.
 ///
 /// At present, this is used as a very limited form of alias analysis. For example,
 /// `MaybeBorrowedLocals` is used to compute which locals are live during a yield expression for
@@ -91,13 +92,17 @@ where
         self.super_rvalue(rvalue, location);
 
         match rvalue {
-            Rvalue::AddressOf(_, borrowed_place) | Rvalue::Ref(_, _, borrowed_place) => {
+            // We ignore fake borrows as these get removed after analysis and shouldn't effect
+            // the layout of generators.
+            Rvalue::AddressOf(_, borrowed_place)
+            | Rvalue::Ref(_, BorrowKind::Mut { .. } | BorrowKind::Shared, borrowed_place) => {
                 if !borrowed_place.is_indirect() {
                     self.trans.gen(borrowed_place.local);
                 }
             }
 
             Rvalue::Cast(..)
+            | Rvalue::Ref(_, BorrowKind::Fake, _)
             | Rvalue::ShallowInitBox(..)
             | Rvalue::Use(..)
             | Rvalue::ThreadLocalRef(..)
diff --git a/compiler/rustc_mir_dataflow/src/impls/liveness.rs b/compiler/rustc_mir_dataflow/src/impls/liveness.rs
index c1152e88cd0f2..bdfb6a6ff6b1a 100644
--- a/compiler/rustc_mir_dataflow/src/impls/liveness.rs
+++ b/compiler/rustc_mir_dataflow/src/impls/liveness.rs
@@ -201,7 +201,7 @@ impl DefUse {
                 | NonMutatingUseContext::Inspect
                 | NonMutatingUseContext::Move
                 | NonMutatingUseContext::PlaceMention
-                | NonMutatingUseContext::ShallowBorrow
+                | NonMutatingUseContext::FakeBorrow
                 | NonMutatingUseContext::SharedBorrow,
             ) => Some(DefUse::Use),
 
diff --git a/compiler/rustc_mir_transform/src/cleanup_post_borrowck.rs b/compiler/rustc_mir_transform/src/cleanup_post_borrowck.rs
index d435d3ee69b76..5b4bc4fa13424 100644
--- a/compiler/rustc_mir_transform/src/cleanup_post_borrowck.rs
+++ b/compiler/rustc_mir_transform/src/cleanup_post_borrowck.rs
@@ -4,13 +4,13 @@
 //!
 //!   - [`AscribeUserType`]
 //!   - [`FakeRead`]
-//!   - [`Assign`] statements with a [`Shallow`] borrow
+//!   - [`Assign`] statements with a [`Fake`] borrow
 //!
 //! [`AscribeUserType`]: rustc_middle::mir::StatementKind::AscribeUserType
 //! [`Assign`]: rustc_middle::mir::StatementKind::Assign
 //! [`FakeRead`]: rustc_middle::mir::StatementKind::FakeRead
 //! [`Nop`]: rustc_middle::mir::StatementKind::Nop
-//! [`Shallow`]: rustc_middle::mir::BorrowKind::Shallow
+//! [`Fake`]: rustc_middle::mir::BorrowKind::Fake
 
 use crate::MirPass;
 use rustc_middle::mir::{Body, BorrowKind, Rvalue, StatementKind, TerminatorKind};
@@ -24,7 +24,7 @@ impl<'tcx> MirPass<'tcx> for CleanupPostBorrowck {
             for statement in basic_block.statements.iter_mut() {
                 match statement.kind {
                     StatementKind::AscribeUserType(..)
-                    | StatementKind::Assign(box (_, Rvalue::Ref(_, BorrowKind::Shallow, _)))
+                    | StatementKind::Assign(box (_, Rvalue::Ref(_, BorrowKind::Fake, _)))
                     | StatementKind::FakeRead(..) => statement.make_nop(),
                     _ => (),
                 }
diff --git a/compiler/rustc_mir_transform/src/const_prop.rs b/compiler/rustc_mir_transform/src/const_prop.rs
index 53c0d0dea2924..0adbb078105af 100644
--- a/compiler/rustc_mir_transform/src/const_prop.rs
+++ b/compiler/rustc_mir_transform/src/const_prop.rs
@@ -668,7 +668,7 @@ impl<'tcx> Visitor<'tcx> for CanConstProp {
             // These can't ever be propagated under any scheme, as we can't reason about indirect
             // mutation.
             | NonMutatingUse(NonMutatingUseContext::SharedBorrow)
-            | NonMutatingUse(NonMutatingUseContext::ShallowBorrow)
+            | NonMutatingUse(NonMutatingUseContext::FakeBorrow)
             | NonMutatingUse(NonMutatingUseContext::AddressOf)
             | MutatingUse(MutatingUseContext::Borrow)
             | MutatingUse(MutatingUseContext::AddressOf) => {
diff --git a/compiler/rustc_mir_transform/src/copy_prop.rs b/compiler/rustc_mir_transform/src/copy_prop.rs
index be4af3b76f1e9..f5db7ce97ebaf 100644
--- a/compiler/rustc_mir_transform/src/copy_prop.rs
+++ b/compiler/rustc_mir_transform/src/copy_prop.rs
@@ -131,7 +131,7 @@ impl<'tcx> MutVisitor<'tcx> for Replacer<'_, 'tcx> {
         let observes_address = match ctxt {
             PlaceContext::NonMutatingUse(
                 NonMutatingUseContext::SharedBorrow
-                | NonMutatingUseContext::ShallowBorrow
+                | NonMutatingUseContext::FakeBorrow
                 | NonMutatingUseContext::AddressOf,
             ) => true,
             // For debuginfo, merging locals is ok.
diff --git a/compiler/rustc_mir_transform/src/coroutine.rs b/compiler/rustc_mir_transform/src/coroutine.rs
index fc30a718cbb57..dfafd8598306b 100644
--- a/compiler/rustc_mir_transform/src/coroutine.rs
+++ b/compiler/rustc_mir_transform/src/coroutine.rs
@@ -637,6 +637,14 @@ struct LivenessInfo {
     storage_liveness: IndexVec<BasicBlock, Option<BitSet<Local>>>,
 }
 
+/// Computes which locals have to be stored in the state-machine for the
+/// given coroutine.
+///
+/// The basic idea is as follows:
+/// - a local is live until we encounter a `StorageDead` statement. In
+///   case none exist, the local is considered to be always live.
+/// - a local has to be stored if it is either directly used after the
+///   the suspend point, or if it is live and has been previously borrowed.
 fn locals_live_across_suspend_points<'tcx>(
     tcx: TyCtxt<'tcx>,
     body: &Body<'tcx>,
@@ -1449,16 +1457,15 @@ pub(crate) fn mir_coroutine_witnesses<'tcx>(
     // The first argument is the coroutine type passed by value
     let coroutine_ty = body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty;
 
-    // Get the interior types and args which typeck computed
     let movable = match *coroutine_ty.kind() {
         ty::Coroutine(_, _, movability) => movability == hir::Movability::Movable,
         ty::Error(_) => return None,
         _ => span_bug!(body.span, "unexpected coroutine type {}", coroutine_ty),
     };
 
-    // When first entering the coroutine, move the resume argument into its new local.
-    let always_live_locals = always_storage_live_locals(&body);
+    // The witness simply contains all locals live across suspend points.
 
+    let always_live_locals = always_storage_live_locals(&body);
     let liveness_info = locals_live_across_suspend_points(tcx, body, &always_live_locals, movable);
 
     // Extract locals which are live across suspension point into `layout`
diff --git a/compiler/rustc_mir_transform/src/ssa.rs b/compiler/rustc_mir_transform/src/ssa.rs
index 8dc7b60c4e53d..1f59c790b4ebe 100644
--- a/compiler/rustc_mir_transform/src/ssa.rs
+++ b/compiler/rustc_mir_transform/src/ssa.rs
@@ -234,7 +234,7 @@ impl<'tcx> Visitor<'tcx> for SsaVisitor<'_> {
             // so we have to remove them too.
             PlaceContext::NonMutatingUse(
                 NonMutatingUseContext::SharedBorrow
-                | NonMutatingUseContext::ShallowBorrow
+                | NonMutatingUseContext::FakeBorrow
                 | NonMutatingUseContext::AddressOf,
             )
             | PlaceContext::MutatingUse(_) => {
diff --git a/compiler/rustc_smir/src/rustc_smir/mod.rs b/compiler/rustc_smir/src/rustc_smir/mod.rs
index 25bd82bf1ef52..27596c08f1c1e 100644
--- a/compiler/rustc_smir/src/rustc_smir/mod.rs
+++ b/compiler/rustc_smir/src/rustc_smir/mod.rs
@@ -455,7 +455,7 @@ impl<'tcx> Stable<'tcx> for mir::BorrowKind {
         use mir::BorrowKind::*;
         match *self {
             Shared => stable_mir::mir::BorrowKind::Shared,
-            Shallow => stable_mir::mir::BorrowKind::Shallow,
+            Fake => stable_mir::mir::BorrowKind::Fake,
             Mut { kind } => stable_mir::mir::BorrowKind::Mut { kind: kind.stable(tables) },
         }
     }
diff --git a/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs b/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
index d655a4106b861..839968b25a1bd 100644
--- a/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
+++ b/compiler/rustc_trait_selection/src/solve/assembly/structural_traits.rs
@@ -14,6 +14,7 @@ use crate::solve::EvalCtxt;
 //
 // For types with an "existential" binder, i.e. coroutine witnesses, we also
 // instantiate the binder with placeholders eagerly.
+#[instrument(level = "debug", skip(ecx), ret)]
 pub(in crate::solve) fn instantiate_constituent_tys_for_auto_trait<'tcx>(
     ecx: &EvalCtxt<'_, 'tcx>,
     ty: Ty<'tcx>,
@@ -107,6 +108,7 @@ pub(in crate::solve) fn replace_erased_lifetimes_with_bound_vars<'tcx>(
     ty::Binder::bind_with_vars(ty, bound_vars)
 }
 
+#[instrument(level = "debug", skip(ecx), ret)]
 pub(in crate::solve) fn instantiate_constituent_tys_for_sized_trait<'tcx>(
     ecx: &EvalCtxt<'_, 'tcx>,
     ty: Ty<'tcx>,
@@ -152,6 +154,7 @@ pub(in crate::solve) fn instantiate_constituent_tys_for_sized_trait<'tcx>(
     }
 }
 
+#[instrument(level = "debug", skip(ecx), ret)]
 pub(in crate::solve) fn instantiate_constituent_tys_for_copy_clone_trait<'tcx>(
     ecx: &EvalCtxt<'_, 'tcx>,
     ty: Ty<'tcx>,
diff --git a/compiler/stable_mir/src/mir/body.rs b/compiler/stable_mir/src/mir/body.rs
index 4818bceadeffc..0693378368534 100644
--- a/compiler/stable_mir/src/mir/body.rs
+++ b/compiler/stable_mir/src/mir/body.rs
@@ -437,9 +437,10 @@ pub enum BorrowKind {
     Shared,
 
     /// The immediately borrowed place must be immutable, but projections from
-    /// it don't need to be. For example, a shallow borrow of `a.b` doesn't
+    /// it don't need to be. This is used to prevent match guards from replacing
+    /// the scrutinee. For example, a fake borrow of `a.b` doesn't
     /// conflict with a mutable borrow of `a.b.c`.
-    Shallow,
+    Fake,
 
     /// Data is mutable and not aliasable.
     Mut {
diff --git a/tests/mir-opt/building/match_false_edges.full_tested_match.built.after.mir b/tests/mir-opt/building/match_false_edges.full_tested_match.built.after.mir
index 1946c70e47642..b99b0b99559a5 100644
--- a/tests/mir-opt/building/match_false_edges.full_tested_match.built.after.mir
+++ b/tests/mir-opt/building/match_false_edges.full_tested_match.built.after.mir
@@ -52,7 +52,7 @@ fn full_tested_match() -> () {
     bb5: {
         StorageLive(_6);
         _6 = &((_2 as Some).0: i32);
-        _4 = &shallow _2;
+        _4 = &fake _2;
         StorageLive(_7);
         _7 = guard() -> [return: bb6, unwind: bb12];
     }
diff --git a/tests/mir-opt/building/match_false_edges.full_tested_match2.built.after.mir b/tests/mir-opt/building/match_false_edges.full_tested_match2.built.after.mir
index b6175b0515683..d1d86b55d686f 100644
--- a/tests/mir-opt/building/match_false_edges.full_tested_match2.built.after.mir
+++ b/tests/mir-opt/building/match_false_edges.full_tested_match2.built.after.mir
@@ -58,7 +58,7 @@ fn full_tested_match2() -> () {
     bb5: {
         StorageLive(_6);
         _6 = &((_2 as Some).0: i32);
-        _4 = &shallow _2;
+        _4 = &fake _2;
         StorageLive(_7);
         _7 = guard() -> [return: bb6, unwind: bb12];
     }
diff --git a/tests/mir-opt/building/match_false_edges.main.built.after.mir b/tests/mir-opt/building/match_false_edges.main.built.after.mir
index 0b57d1b97e15d..1d4fe67f350ca 100644
--- a/tests/mir-opt/building/match_false_edges.main.built.after.mir
+++ b/tests/mir-opt/building/match_false_edges.main.built.after.mir
@@ -78,7 +78,7 @@ fn main() -> () {
     bb8: {
         StorageLive(_7);
         _7 = &((_2 as Some).0: i32);
-        _5 = &shallow _2;
+        _5 = &fake _2;
         StorageLive(_8);
         _8 = guard() -> [return: bb9, unwind: bb20];
     }
@@ -120,7 +120,7 @@ fn main() -> () {
     bb14: {
         StorageLive(_11);
         _11 = &((_2 as Some).0: i32);
-        _5 = &shallow _2;
+        _5 = &fake _2;
         StorageLive(_12);
         StorageLive(_13);
         _13 = (*_11);
diff --git a/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff b/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff
index 2989582d03827..b4bd45ba597f2 100644
--- a/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff
+++ b/tests/mir-opt/match_arm_scopes.complicated_match.panic-abort.SimplifyCfg-initial.after-ElaborateDrops.after.diff
@@ -80,8 +80,8 @@
           _6 = &(_2.1: bool);
           StorageLive(_8);
           _8 = &(_2.2: std::string::String);
--         _3 = &shallow (_2.0: bool);
--         _4 = &shallow (_2.1: bool);
+-         _3 = &fake (_2.0: bool);
+-         _4 = &fake (_2.1: bool);
           StorageLive(_9);
           StorageLive(_10);
           _10 = _1;
@@ -137,8 +137,8 @@
           _6 = &(_2.0: bool);
           StorageLive(_8);
           _8 = &(_2.2: std::string::String);
--         _3 = &shallow (_2.0: bool);
--         _4 = &shallow (_2.1: bool);
+-         _3 = &fake (_2.0: bool);
+-         _4 = &fake (_2.1: bool);
           StorageLive(_12);
           StorageLive(_13);
           _13 = _1;
diff --git a/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff b/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff
index 2989582d03827..b4bd45ba597f2 100644
--- a/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff
+++ b/tests/mir-opt/match_arm_scopes.complicated_match.panic-unwind.SimplifyCfg-initial.after-ElaborateDrops.after.diff
@@ -80,8 +80,8 @@
           _6 = &(_2.1: bool);
           StorageLive(_8);
           _8 = &(_2.2: std::string::String);
--         _3 = &shallow (_2.0: bool);
--         _4 = &shallow (_2.1: bool);
+-         _3 = &fake (_2.0: bool);
+-         _4 = &fake (_2.1: bool);
           StorageLive(_9);
           StorageLive(_10);
           _10 = _1;
@@ -137,8 +137,8 @@
           _6 = &(_2.0: bool);
           StorageLive(_8);
           _8 = &(_2.2: std::string::String);
--         _3 = &shallow (_2.0: bool);
--         _4 = &shallow (_2.1: bool);
+-         _3 = &fake (_2.0: bool);
+-         _4 = &fake (_2.1: bool);
           StorageLive(_12);
           StorageLive(_13);
           _13 = _1;
diff --git a/tests/mir-opt/match_test.main.SimplifyCfg-initial.after.mir b/tests/mir-opt/match_test.main.SimplifyCfg-initial.after.mir
index 90ec3ab49ad00..ebb2f70a47587 100644
--- a/tests/mir-opt/match_test.main.SimplifyCfg-initial.after.mir
+++ b/tests/mir-opt/match_test.main.SimplifyCfg-initial.after.mir
@@ -68,7 +68,7 @@ fn main() -> () {
     }
 
     bb9: {
-        _8 = &shallow _1;
+        _8 = &fake _1;
         StorageLive(_9);
         _9 = _2;
         switchInt(move _9) -> [0: bb11, otherwise: bb10];
diff --git a/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-abort.diff b/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-abort.diff
index 61329bb75d13e..54da6ee659f95 100644
--- a/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-abort.diff
+++ b/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-abort.diff
@@ -33,10 +33,10 @@
       }
   
       bb4: {
--         _4 = &shallow _1;
--         _5 = &shallow (*((_1 as Some).0: &&i32));
--         _6 = &shallow ((_1 as Some).0: &&i32);
--         _7 = &shallow (*(*((_1 as Some).0: &&i32)));
+-         _4 = &fake _1;
+-         _5 = &fake (*((_1 as Some).0: &&i32));
+-         _6 = &fake ((_1 as Some).0: &&i32);
+-         _7 = &fake (*(*((_1 as Some).0: &&i32)));
 +         nop;
 +         nop;
 +         nop;
diff --git a/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-unwind.diff b/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-unwind.diff
index 61329bb75d13e..54da6ee659f95 100644
--- a/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-unwind.diff
+++ b/tests/mir-opt/remove_fake_borrows.match_guard.CleanupPostBorrowck.panic-unwind.diff
@@ -33,10 +33,10 @@
       }
   
       bb4: {
--         _4 = &shallow _1;
--         _5 = &shallow (*((_1 as Some).0: &&i32));
--         _6 = &shallow ((_1 as Some).0: &&i32);
--         _7 = &shallow (*(*((_1 as Some).0: &&i32)));
+-         _4 = &fake _1;
+-         _5 = &fake (*((_1 as Some).0: &&i32));
+-         _6 = &fake ((_1 as Some).0: &&i32);
+-         _7 = &fake (*(*((_1 as Some).0: &&i32)));
 +         nop;
 +         nop;
 +         nop;
diff --git a/tests/ui/coroutine/witness-ignore-fake-reads.rs b/tests/ui/coroutine/witness-ignore-fake-reads.rs
new file mode 100644
index 0000000000000..ccf9ce8b49e18
--- /dev/null
+++ b/tests/ui/coroutine/witness-ignore-fake-reads.rs
@@ -0,0 +1,34 @@
+// check-pass
+// edition: 2021
+
+// regression test for #117059
+struct SendNotSync(*const ());
+unsafe impl Send for SendNotSync {}
+// impl !Sync for SendNotSync {} // automatically disabled
+
+struct Inner {
+    stream: SendNotSync,
+    state: bool,
+}
+
+struct SendSync;
+impl std::ops::Deref for SendSync {
+    type Target = Inner;
+    fn deref(&self) -> &Self::Target {
+        todo!();
+    }
+}
+
+async fn next() {
+    let inner = SendSync;
+    match inner.state {
+        true if false => {}
+        false => async {}.await,
+        _ => {}
+    }
+}
+
+fn is_send<T: Send>(_: T) {}
+fn main() {
+    is_send(next())
+}