Separate the mir body lifetime from the other lifetimes

compiler/rustc_borrowck/src/borrowck_errors.rs

@@ -6,7 +6,7 @@ use rustc_middle::span_bug;
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_span::Span;
 
-impl<'cx, 'tcx> crate::MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> crate::MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     pub fn dcx(&self) -> DiagCtxtHandle<'tcx> {
         self.infcx.dcx()
     }

compiler/rustc_borrowck/src/diagnostics/bound_region_errors.rs

@@ -52,7 +52,7 @@ impl<'tcx> UniverseInfo<'tcx> {
 
     pub(crate) fn report_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         placeholder: ty::PlaceholderRegion,
         error_element: RegionElement,
         cause: ObligationCause<'tcx>,
@@ -151,7 +151,7 @@ trait TypeOpInfo<'tcx> {
 
     fn nice_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         cause: ObligationCause<'tcx>,
         placeholder_region: ty::Region<'tcx>,
         error_region: Option<ty::Region<'tcx>>,
@@ -160,7 +160,7 @@ trait TypeOpInfo<'tcx> {
     #[instrument(level = "debug", skip(self, mbcx))]
     fn report_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         placeholder: ty::PlaceholderRegion,
         error_element: RegionElement,
         cause: ObligationCause<'tcx>,
@@ -233,7 +233,7 @@ impl<'tcx> TypeOpInfo<'tcx> for PredicateQuery<'tcx> {
 
     fn nice_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         cause: ObligationCause<'tcx>,
         placeholder_region: ty::Region<'tcx>,
         error_region: Option<ty::Region<'tcx>>,
@@ -270,7 +270,7 @@ where
 
     fn nice_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         cause: ObligationCause<'tcx>,
         placeholder_region: ty::Region<'tcx>,
         error_region: Option<ty::Region<'tcx>>,
@@ -310,7 +310,7 @@ impl<'tcx> TypeOpInfo<'tcx> for AscribeUserTypeQuery<'tcx> {
 
     fn nice_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         cause: ObligationCause<'tcx>,
         placeholder_region: ty::Region<'tcx>,
         error_region: Option<ty::Region<'tcx>>,
@@ -336,7 +336,7 @@ impl<'tcx> TypeOpInfo<'tcx> for crate::type_check::InstantiateOpaqueType<'tcx> {
 
     fn nice_error(
         &self,
-        mbcx: &mut MirBorrowckCtxt<'_, '_, 'tcx>,
+        mbcx: &mut MirBorrowckCtxt<'_, '_, '_, 'tcx>,
         _cause: ObligationCause<'tcx>,
         placeholder_region: ty::Region<'tcx>,
         error_region: Option<ty::Region<'tcx>>,

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -73,7 +73,7 @@ enum StorageDeadOrDrop<'tcx> {
     Destructor(Ty<'tcx>),
 }
 
-impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     pub(crate) fn report_use_of_moved_or_uninitialized(
         &mut self,
         location: Location,
@@ -4243,7 +4243,11 @@ enum AnnotatedBorrowFnSignature<'tcx> {
 impl<'tcx> AnnotatedBorrowFnSignature<'tcx> {
     /// Annotate the provided diagnostic with information about borrow from the fn signature that
     /// helps explain.
-    pub(crate) fn emit(&self, cx: &MirBorrowckCtxt<'_, '_, 'tcx>, diag: &mut Diag<'_>) -> String {
+    pub(crate) fn emit(
+        &self,
+        cx: &MirBorrowckCtxt<'_, '_, '_, 'tcx>,
+        diag: &mut Diag<'_>,
+    ) -> String {
         match self {
             &AnnotatedBorrowFnSignature::Closure { argument_ty, argument_span } => {
                 diag.span_label(

compiler/rustc_borrowck/src/diagnostics/explain_borrow.rs

@@ -389,7 +389,7 @@ impl<'tcx> BorrowExplanation<'tcx> {
     }
 }
 
-impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     fn free_region_constraint_info(
         &self,
         borrow_region: RegionVid,

compiler/rustc_borrowck/src/diagnostics/mod.rs

@@ -69,7 +69,7 @@ pub(super) struct DescribePlaceOpt {
 
 pub(super) struct IncludingTupleField(pub(super) bool);
 
-impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     /// Adds a suggestion when a closure is invoked twice with a moved variable or when a closure
     /// is moved after being invoked.
     ///
@@ -771,7 +771,7 @@ struct CapturedMessageOpt {
     maybe_reinitialized_locations_is_empty: bool,
 }
 
-impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     /// Finds the spans associated to a move or copy of move_place at location.
     pub(super) fn move_spans(
         &self,

compiler/rustc_borrowck/src/diagnostics/move_errors.rs

@@ -93,7 +93,7 @@ enum GroupedMoveError<'tcx> {
     },
 }
 
-impl<'a, 'tcx> MirBorrowckCtxt<'_, 'a, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     pub(crate) fn report_move_errors(&mut self) {
         let grouped_errors = self.group_move_errors();
         for error in grouped_errors {

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -30,7 +30,7 @@ pub(crate) enum AccessKind {
     Mutate,
 }
 
-impl<'a, 'tcx> MirBorrowckCtxt<'a, '_, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     pub(crate) fn report_mutability_error(
         &mut self,
         access_place: Place<'tcx>,

compiler/rustc_borrowck/src/diagnostics/outlives_suggestion.rs

@@ -75,7 +75,7 @@ impl OutlivesSuggestionBuilder {
     /// Returns a name for the region if it is suggestable. See `region_name_is_suggestable`.
     fn region_vid_to_name(
         &self,
-        mbcx: &MirBorrowckCtxt<'_, '_, '_>,
+        mbcx: &MirBorrowckCtxt<'_, '_, '_, '_>,
         region: RegionVid,
     ) -> Option<RegionName> {
         mbcx.give_region_a_name(region).filter(Self::region_name_is_suggestable)
@@ -84,7 +84,7 @@ impl OutlivesSuggestionBuilder {
     /// Compiles a list of all suggestions to be printed in the final big suggestion.
     fn compile_all_suggestions(
         &self,
-        mbcx: &MirBorrowckCtxt<'_, '_, '_>,
+        mbcx: &MirBorrowckCtxt<'_, '_, '_, '_>,
     ) -> SmallVec<[SuggestedConstraint; 2]> {
         let mut suggested = SmallVec::new();
 
@@ -160,7 +160,7 @@ impl OutlivesSuggestionBuilder {
     /// Emit an intermediate note on the given `Diag` if the involved regions are suggestable.
     pub(crate) fn intermediate_suggestion(
         &mut self,
-        mbcx: &MirBorrowckCtxt<'_, '_, '_>,
+        mbcx: &MirBorrowckCtxt<'_, '_, '_, '_>,
         errci: &ErrorConstraintInfo<'_>,
         diag: &mut Diag<'_>,
     ) {
@@ -179,7 +179,7 @@ impl OutlivesSuggestionBuilder {
 
     /// If there is a suggestion to emit, add a diagnostic to the buffer. This is the final
     /// suggestion including all collected constraints.
-    pub(crate) fn add_suggestion(&self, mbcx: &mut MirBorrowckCtxt<'_, '_, '_>) {
+    pub(crate) fn add_suggestion(&self, mbcx: &mut MirBorrowckCtxt<'_, '_, '_, '_>) {
         // No constraints to add? Done.
         if self.constraints_to_add.is_empty() {
             debug!("No constraints to suggest.");

compiler/rustc_borrowck/src/diagnostics/region_errors.rs

@@ -160,7 +160,7 @@ pub struct ErrorConstraintInfo<'tcx> {
     pub(super) span: Span,
 }
 
-impl<'a, 'tcx> MirBorrowckCtxt<'a, '_, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     /// Converts a region inference variable into a `ty::Region` that
     /// we can use for error reporting. If `r` is universally bound,
     /// then we use the name that we have on record for it. If `r` is

compiler/rustc_borrowck/src/diagnostics/region_name.rs

@@ -198,7 +198,7 @@ impl rustc_errors::IntoDiagArg for RegionName {
     }
 }
 
-impl<'tcx> MirBorrowckCtxt<'_, '_, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     pub(crate) fn mir_def_id(&self) -> hir::def_id::LocalDefId {
         self.body.source.def_id().expect_local()
     }

compiler/rustc_borrowck/src/lib.rs

@@ -310,11 +310,11 @@ fn do_mir_borrowck<'tcx>(
         promoted_mbcx.report_move_errors();
         diags = promoted_mbcx.diags;
 
-        struct MoveVisitor<'a, 'b, 'cx, 'tcx> {
-            ctxt: &'a mut MirBorrowckCtxt<'b, 'cx, 'tcx>,
+        struct MoveVisitor<'a, 'b, 'mir, 'cx, 'tcx> {
+            ctxt: &'a mut MirBorrowckCtxt<'b, 'mir, 'cx, 'tcx>,
         }
 
-        impl<'tcx> Visitor<'tcx> for MoveVisitor<'_, '_, '_, 'tcx> {
+        impl<'tcx> Visitor<'tcx> for MoveVisitor<'_, '_, '_, '_, 'tcx> {
             fn visit_operand(&mut self, operand: &Operand<'tcx>, location: Location) {
                 if let Operand::Move(place) = operand {
                     self.ctxt.check_movable_place(location, *place);
@@ -528,10 +528,10 @@ impl<'tcx> Deref for BorrowckInferCtxt<'tcx> {
     }
 }
 
-struct MirBorrowckCtxt<'a, 'cx, 'tcx> {
+struct MirBorrowckCtxt<'a, 'mir, 'cx, 'tcx> {
     infcx: &'cx BorrowckInferCtxt<'tcx>,
     param_env: ParamEnv<'tcx>,
-    body: &'a Body<'tcx>,
+    body: &'mir Body<'tcx>,
     move_data: &'a MoveData<'tcx>,
 
     /// Map from MIR `Location` to `LocationIndex`; created
@@ -605,16 +605,16 @@ struct MirBorrowckCtxt<'a, 'cx, 'tcx> {
 // 2. loans made in overlapping scopes do not conflict
 // 3. assignments do not affect things loaned out as immutable
 // 4. moves do not affect things loaned out in any way
-impl<'cx, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx, R>
-    for MirBorrowckCtxt<'_, 'cx, 'tcx>
+impl<'mir, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'mir, 'tcx, R>
+    for MirBorrowckCtxt<'_, 'mir, '_, 'tcx>
 {
-    type FlowState = Flows<'cx, 'tcx>;
+    type FlowState = Flows<'mir, 'tcx>;
 
     fn visit_statement_before_primary_effect(
         &mut self,
         _results: &mut R,
-        flow_state: &Flows<'cx, 'tcx>,
-        stmt: &'cx Statement<'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
+        stmt: &'mir Statement<'tcx>,
         location: Location,
     ) {
         debug!("MirBorrowckCtxt::process_statement({:?}, {:?}): {:?}", location, stmt, flow_state);
@@ -683,8 +683,8 @@ impl<'cx, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx, R>
     fn visit_terminator_before_primary_effect(
         &mut self,
         _results: &mut R,
-        flow_state: &Flows<'cx, 'tcx>,
-        term: &'cx Terminator<'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
+        term: &'mir Terminator<'tcx>,
         loc: Location,
     ) {
         debug!("MirBorrowckCtxt::process_terminator({:?}, {:?}): {:?}", loc, term, flow_state);
@@ -794,8 +794,8 @@ impl<'cx, 'tcx, R> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx, R>
     fn visit_terminator_after_primary_effect(
         &mut self,
         _results: &mut R,
-        flow_state: &Flows<'cx, 'tcx>,
-        term: &'cx Terminator<'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
+        term: &'mir Terminator<'tcx>,
         loc: Location,
     ) {
         let span = term.source_info.span;
@@ -971,8 +971,8 @@ impl InitializationRequiringAction {
     }
 }
 
-impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
-    fn body(&self) -> &'a Body<'tcx> {
+impl<'mir, 'tcx> MirBorrowckCtxt<'_, 'mir, '_, 'tcx> {
+    fn body(&self) -> &'mir Body<'tcx> {
         self.body
     }
 
@@ -988,7 +988,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         place_span: (Place<'tcx>, Span),
         kind: (AccessDepth, ReadOrWrite),
         is_local_mutation_allowed: LocalMutationIsAllowed,
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         let (sd, rw) = kind;
 
@@ -1038,7 +1038,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         place_span: (Place<'tcx>, Span),
         sd: AccessDepth,
         rw: ReadOrWrite,
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) -> bool {
         let mut error_reported = false;
         let borrow_set = Rc::clone(&self.borrow_set);
@@ -1179,7 +1179,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         location: Location,
         place_span: (Place<'tcx>, Span),
         kind: AccessDepth,
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         // Write of P[i] or *P requires P init'd.
         self.check_if_assigned_path_is_moved(location, place_span, flow_state);
@@ -1196,8 +1196,8 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
     fn consume_rvalue(
         &mut self,
         location: Location,
-        (rvalue, span): (&'cx Rvalue<'tcx>, Span),
-        flow_state: &Flows<'cx, 'tcx>,
+        (rvalue, span): (&'mir Rvalue<'tcx>, Span),
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         match rvalue {
             &Rvalue::Ref(_ /*rgn*/, bk, place) => {
@@ -1454,8 +1454,8 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
     fn consume_operand(
         &mut self,
         location: Location,
-        (operand, span): (&'cx Operand<'tcx>, Span),
-        flow_state: &Flows<'cx, 'tcx>,
+        (operand, span): (&'mir Operand<'tcx>, Span),
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         match *operand {
             Operand::Copy(place) => {
@@ -1575,7 +1575,12 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         }
     }
 
-    fn check_activations(&mut self, location: Location, span: Span, flow_state: &Flows<'cx, 'tcx>) {
+    fn check_activations(
+        &mut self,
+        location: Location,
+        span: Span,
+        flow_state: &Flows<'mir, 'tcx>,
+    ) {
         // Two-phase borrow support: For each activation that is newly
         // generated at this statement, check if it interferes with
         // another borrow.
@@ -1738,7 +1743,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         location: Location,
         desired_action: InitializationRequiringAction,
         place_span: (PlaceRef<'tcx>, Span),
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         let maybe_uninits = &flow_state.uninits;
 
@@ -1843,7 +1848,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         location: Location,
         desired_action: InitializationRequiringAction,
         place_span: (PlaceRef<'tcx>, Span),
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         let maybe_uninits = &flow_state.uninits;
 
@@ -1942,7 +1947,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         &mut self,
         location: Location,
         (place, span): (Place<'tcx>, Span),
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) {
         debug!("check_if_assigned_path_is_moved place: {:?}", place);
 
@@ -2003,12 +2008,12 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
             }
         }
 
-        fn check_parent_of_field<'cx, 'tcx>(
-            this: &mut MirBorrowckCtxt<'_, 'cx, 'tcx>,
+        fn check_parent_of_field<'mir, 'tcx>(
+            this: &mut MirBorrowckCtxt<'_, 'mir, '_, 'tcx>,
             location: Location,
             base: PlaceRef<'tcx>,
             span: Span,
-            flow_state: &Flows<'cx, 'tcx>,
+            flow_state: &Flows<'mir, 'tcx>,
         ) {
             // rust-lang/rust#21232: Until Rust allows reads from the
             // initialized parts of partially initialized structs, we
@@ -2099,7 +2104,7 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
         (place, span): (Place<'tcx>, Span),
         kind: ReadOrWrite,
         is_local_mutation_allowed: LocalMutationIsAllowed,
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
         location: Location,
     ) -> bool {
         debug!(
@@ -2215,15 +2220,15 @@ impl<'a, 'cx, 'tcx> MirBorrowckCtxt<'a, 'cx, 'tcx> {
     fn is_local_ever_initialized(
         &self,
         local: Local,
-        flow_state: &Flows<'cx, 'tcx>,
+        flow_state: &Flows<'mir, 'tcx>,
     ) -> Option<InitIndex> {
         let mpi = self.move_data.rev_lookup.find_local(local)?;
         let ii = &self.move_data.init_path_map[mpi];
         ii.into_iter().find(|&&index| flow_state.ever_inits.contains(index)).copied()
     }
 
     /// Adds the place into the used mutable variables set
-    fn add_used_mut(&mut self, root_place: RootPlace<'tcx>, flow_state: &Flows<'cx, 'tcx>) {
+    fn add_used_mut(&mut self, root_place: RootPlace<'tcx>, flow_state: &Flows<'mir, 'tcx>) {
         match root_place {
             RootPlace { place_local: local, place_projection: [], is_local_mutation_allowed } => {
                 // If the local may have been initialized, and it is now currently being
@@ -2478,7 +2483,7 @@ mod diags {
         }
     }
 
-    impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+    impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
         pub fn buffer_error(&mut self, diag: Diag<'tcx>) {
             self.diags.buffer_error(diag);
         }

compiler/rustc_borrowck/src/prefixes.rs

@@ -34,7 +34,7 @@ pub(super) enum PrefixSet {
     Shallow,
 }
 
-impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     /// Returns an iterator over the prefixes of `place`
     /// (inclusive) from longest to smallest, potentially
     /// terminating the iteration early based on `kind`.

compiler/rustc_borrowck/src/used_muts.rs

@@ -6,7 +6,7 @@ use rustc_middle::mir::{
 
 use crate::MirBorrowckCtxt;
 
-impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
+impl<'tcx> MirBorrowckCtxt<'_, '_, '_, 'tcx> {
     /// Walks the MIR adding to the set of `used_mut` locals that will be ignored for the purposes
     /// of the `unused_mut` lint.
     ///
@@ -45,13 +45,13 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'_, 'cx, 'tcx> {
 
 /// MIR visitor for collecting used mutable variables.
 /// The 'visit lifetime represents the duration of the MIR walk.
-struct GatherUsedMutsVisitor<'visit, 'a, 'cx, 'tcx> {
+struct GatherUsedMutsVisitor<'visit, 'a, 'mir, 'cx, 'tcx> {
     temporary_used_locals: FxIndexSet<Local>,
     never_initialized_mut_locals: &'visit mut FxIndexSet<Local>,
-    mbcx: &'visit mut MirBorrowckCtxt<'a, 'cx, 'tcx>,
+    mbcx: &'visit mut MirBorrowckCtxt<'a, 'mir, 'cx, 'tcx>,
 }
 
-impl GatherUsedMutsVisitor<'_, '_, '_, '_> {
+impl GatherUsedMutsVisitor<'_, '_, '_, '_, '_> {
     fn remove_never_initialized_mut_locals(&mut self, into: Place<'_>) {
         // Remove any locals that we found were initialized from the
         // `never_initialized_mut_locals` set. At the end, the only remaining locals will
@@ -63,7 +63,7 @@ impl GatherUsedMutsVisitor<'_, '_, '_, '_> {
     }
 }
 
-impl<'visit, 'cx, 'tcx> Visitor<'tcx> for GatherUsedMutsVisitor<'visit, '_, 'cx, 'tcx> {
+impl<'tcx> Visitor<'tcx> for GatherUsedMutsVisitor<'_, '_, '_, '_, 'tcx> {
     fn visit_terminator(&mut self, terminator: &Terminator<'tcx>, location: Location) {
         debug!("visit_terminator: terminator={:?}", terminator);
         match &terminator.kind {