require a tcx for TypeVisitor

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1537,6 +1537,10 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         }
 
         impl<'tcx> ty::fold::TypeVisitor<'tcx> for OpaqueTypesVisitor<'tcx> {
+            fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
+                self.tcx
+            }
+
             fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
                 if let Some((kind, def_id)) = TyCategory::from_ty(self.tcx, t) {
                     let span = self.tcx.def_span(def_id);

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -9,7 +9,9 @@ use rustc_errors::{struct_span_err, Applicability, DiagnosticBuilder, ErrorRepor
 use rustc_hir::def_id::DefId;
 use rustc_hir::intravisit::{walk_ty, ErasedMap, NestedVisitorMap, Visitor};
 use rustc_hir::{self as hir, GenericBound, Item, ItemKind, Lifetime, LifetimeName, Node, TyKind};
-use rustc_middle::ty::{self, AssocItemContainer, RegionKind, Ty, TypeFoldable, TypeVisitor};
+use rustc_middle::ty::{
+    self, AssocItemContainer, RegionKind, Ty, TyCtxt, TypeFoldable, TypeVisitor,
+};
 use rustc_span::symbol::Ident;
 use rustc_span::{MultiSpan, Span};
 
@@ -476,8 +478,12 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
 /// Collect all the trait objects in a type that could have received an implicit `'static` lifetime.
 pub(super) struct TraitObjectVisitor(pub(super) FxHashSet<DefId>);
 
-impl TypeVisitor<'_> for TraitObjectVisitor {
+impl<'tcx> TypeVisitor<'tcx> for TraitObjectVisitor {
-    fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<Self::BreakTy> {
+    fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
+        bug!("tcx_for_anon_const_substs called for TraitObjectVisitor");
+    }
+
+    fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         match t.kind() {
             ty::Dynamic(preds, RegionKind::ReStatic) => {
                 if let Some(def_id) = preds.principal_def_id() {

compiler/rustc_infer/src/infer/nll_relate/mod.rs

@@ -202,6 +202,7 @@ where
         };
 
         value.skip_binder().visit_with(&mut ScopeInstantiator {
+            tcx: self.infcx.tcx,
             next_region: &mut next_region,
             target_index: ty::INNERMOST,
             bound_region_scope: &mut scope,
@@ -757,6 +758,7 @@ where
 /// `for<..`>.  For each of those, it creates an entry in
 /// `bound_region_scope`.
 struct ScopeInstantiator<'me, 'tcx> {
+    tcx: TyCtxt<'tcx>,
     next_region: &'me mut dyn FnMut(ty::BoundRegion) -> ty::Region<'tcx>,
     // The debruijn index of the scope we are instantiating.
     target_index: ty::DebruijnIndex,
@@ -764,6 +766,10 @@ struct ScopeInstantiator<'me, 'tcx> {
 }
 
 impl<'me, 'tcx> TypeVisitor<'tcx> for ScopeInstantiator<'me, 'tcx> {
+    fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &ty::Binder<'tcx, T>,

compiler/rustc_infer/src/infer/resolve.rs

@@ -126,6 +126,11 @@ impl<'a, 'tcx> UnresolvedTypeFinder<'a, 'tcx> {
 
 impl<'a, 'tcx> TypeVisitor<'tcx> for UnresolvedTypeFinder<'a, 'tcx> {
     type BreakTy = (Ty<'tcx>, Option<Span>);
+
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.infcx.tcx
+    }
+
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         let t = self.infcx.shallow_resolve(t);
         if t.has_infer_types() {

compiler/rustc_lint/src/types.rs

@@ -1160,6 +1160,9 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
 
         impl<'a, 'tcx> ty::fold::TypeVisitor<'tcx> for ProhibitOpaqueTypes<'a, 'tcx> {
             type BreakTy = Ty<'tcx>;
+            fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+                self.cx.tcx
+            }
 
             fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
                 match ty.kind() {

compiler/rustc_middle/src/ty/fold.rs

@@ -189,6 +189,12 @@ pub trait TypeFolder<'tcx>: Sized {
 
 pub trait TypeVisitor<'tcx>: Sized {
     type BreakTy = !;
+    /// Supplies the `tcx` for an unevaluated anonymous constant in case its default substs
+    /// are not yet supplied.
+    ///
+    /// Visitors which do not look into these substs may leave this unimplemented, so be
+    /// careful when calling this method elsewhere.
+    fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx>;
 
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
@@ -301,7 +307,8 @@ impl<'tcx> TyCtxt<'tcx> {
         value: &impl TypeFoldable<'tcx>,
         callback: impl FnMut(ty::Region<'tcx>) -> bool,
     ) -> bool {
-        struct RegionVisitor<F> {
+        struct RegionVisitor<'tcx, F> {
+            tcx: TyCtxt<'tcx>,
             /// The index of a binder *just outside* the things we have
             /// traversed. If we encounter a bound region bound by this
             /// binder or one outer to it, it appears free. Example:
@@ -323,12 +330,16 @@ impl<'tcx> TyCtxt<'tcx> {
             callback: F,
         }
 
-        impl<'tcx, F> TypeVisitor<'tcx> for RegionVisitor<F>
+        impl<'tcx, F> TypeVisitor<'tcx> for RegionVisitor<'tcx, F>
         where
             F: FnMut(ty::Region<'tcx>) -> bool,
         {
             type BreakTy = ();
 
+            fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+                self.tcx
+            }
+
             fn visit_binder<T: TypeFoldable<'tcx>>(
                 &mut self,
                 t: &Binder<'tcx, T>,
@@ -364,7 +375,9 @@ impl<'tcx> TyCtxt<'tcx> {
             }
         }
 
-        value.visit_with(&mut RegionVisitor { outer_index: ty::INNERMOST, callback }).is_break()
+        value
+            .visit_with(&mut RegionVisitor { tcx: self, outer_index: ty::INNERMOST, callback })
+            .is_break()
     }
 }
 
@@ -708,7 +721,7 @@ impl<'tcx> TyCtxt<'tcx> {
     where
         T: TypeFoldable<'tcx>,
     {
-        let mut collector = LateBoundRegionsCollector::new(just_constraint);
+        let mut collector = LateBoundRegionsCollector::new(self, just_constraint);
         let result = value.as_ref().skip_binder().visit_with(&mut collector);
         assert!(result.is_continue()); // should never have stopped early
         collector.regions
@@ -775,6 +788,10 @@ impl<'tcx> ValidateBoundVars<'tcx> {
 impl<'tcx> TypeVisitor<'tcx> for ValidateBoundVars<'tcx> {
     type BreakTy = ();
 
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        bug!("default anon const substs can't contain bound vars");
+    }
+
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &Binder<'tcx, T>,
@@ -989,6 +1006,10 @@ struct HasEscapingVarsVisitor {
 impl<'tcx> TypeVisitor<'tcx> for HasEscapingVarsVisitor {
     type BreakTy = FoundEscapingVars;
 
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        bug!("tcx_for_anon_const_substs called for HasEscpaingVarsVisitor");
+    }
+
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &Binder<'tcx, T>,
@@ -1059,6 +1080,9 @@ struct HasTypeFlagsVisitor {
 
 impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
     type BreakTy = FoundFlags;
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        bug!("tcx_for_anon_const_substs called for HasTypeFlagsVisitor");
+    }
 
     #[inline]
     fn visit_ty(&mut self, t: Ty<'_>) -> ControlFlow<Self::BreakTy> {
@@ -1113,7 +1137,8 @@ impl<'tcx> TypeVisitor<'tcx> for HasTypeFlagsVisitor {
 
 /// Collects all the late-bound regions at the innermost binding level
 /// into a hash set.
-struct LateBoundRegionsCollector {
+struct LateBoundRegionsCollector<'tcx> {
+    tcx: TyCtxt<'tcx>,
     current_index: ty::DebruijnIndex,
     regions: FxHashSet<ty::BoundRegionKind>,
 
@@ -1127,9 +1152,10 @@ struct LateBoundRegionsCollector {
     just_constrained: bool,
 }
 
-impl LateBoundRegionsCollector {
+impl LateBoundRegionsCollector<'tcx> {
-    fn new(just_constrained: bool) -> Self {
+    fn new(tcx: TyCtxt<'tcx>, just_constrained: bool) -> Self {
         LateBoundRegionsCollector {
+            tcx,
             current_index: ty::INNERMOST,
             regions: Default::default(),
             just_constrained,
@@ -1137,7 +1163,11 @@ impl LateBoundRegionsCollector {
     }
 }
 
-impl<'tcx> TypeVisitor<'tcx> for LateBoundRegionsCollector {
+impl<'tcx> TypeVisitor<'tcx> for LateBoundRegionsCollector<'tcx> {
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &Binder<'tcx, T>,

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -2017,6 +2017,7 @@ impl<F: fmt::Write> FmtPrinter<'_, 'tcx, F> {
         debug!("prepare_late_bound_region_info(value: {:?})", value);
 
         struct LateBoundRegionNameCollector<'a, 'tcx> {
+            tcx: TyCtxt<'tcx>,
             used_region_names: &'a mut FxHashSet<Symbol>,
             type_collector: SsoHashSet<Ty<'tcx>>,
         }
@@ -2024,6 +2025,10 @@ impl<F: fmt::Write> FmtPrinter<'_, 'tcx, F> {
         impl<'tcx> ty::fold::TypeVisitor<'tcx> for LateBoundRegionNameCollector<'_, 'tcx> {
             type BreakTy = ();
 
+            fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+                self.tcx
+            }
+
             fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
                 debug!("LateBoundRegionNameCollector::visit_region(r: {:?}, address: {:p})", r, &r);
                 if let ty::ReLateBound(_, ty::BoundRegion { kind: ty::BrNamed(_, name), .. }) = *r {
@@ -2053,6 +2058,7 @@ impl<F: fmt::Write> FmtPrinter<'_, 'tcx, F> {
 
         self.used_region_names.clear();
         let mut collector = LateBoundRegionNameCollector {
+            tcx: self.tcx,
             used_region_names: &mut self.used_region_names,
             type_collector: SsoHashSet::new(),
         };

compiler/rustc_mir/src/interpret/util.rs

@@ -21,6 +21,10 @@ where
     impl<'tcx> TypeVisitor<'tcx> for UsedParamsNeedSubstVisitor<'tcx> {
         type BreakTy = FoundParam;
 
+        fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+            self.tcx
+        }
+
         fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
             if !c.needs_subst() {
                 return ControlFlow::CONTINUE;

compiler/rustc_mir/src/monomorphize/polymorphize.rs

@@ -178,7 +178,7 @@ fn mark_used_by_predicates<'tcx>(
             // Consider all generic params in a predicate as used if any other parameter in the
             // predicate is used.
             let any_param_used = {
-                let mut vis = HasUsedGenericParams { unused_parameters };
+                let mut vis = HasUsedGenericParams { tcx, unused_parameters };
                 predicate.visit_with(&mut vis).is_break()
             };
 
@@ -283,6 +283,9 @@ impl<'a, 'tcx> Visitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
 }
 
 impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
     #[instrument(skip(self))]
     fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<Self::BreakTy> {
         if !c.has_param_types_or_consts() {
@@ -346,13 +349,18 @@ impl<'a, 'tcx> TypeVisitor<'tcx> for MarkUsedGenericParams<'a, 'tcx> {
 }
 
 /// Visitor used to check if a generic parameter is used.
-struct HasUsedGenericParams<'a> {
+struct HasUsedGenericParams<'a, 'tcx> {
+    tcx: TyCtxt<'tcx>,
     unused_parameters: &'a FiniteBitSet<u32>,
 }
 
-impl<'a, 'tcx> TypeVisitor<'tcx> for HasUsedGenericParams<'a> {
+impl<'a, 'tcx> TypeVisitor<'tcx> for HasUsedGenericParams<'a, 'tcx> {
     type BreakTy = ();
 
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
     #[instrument(skip(self))]
     fn visit_const(&mut self, c: &'tcx Const<'tcx>) -> ControlFlow<Self::BreakTy> {
         if !c.has_param_types_or_consts() {

compiler/rustc_mir/src/util/pretty.rs

@@ -682,6 +682,10 @@ pub fn write_allocations<'tcx>(
     }
     struct CollectAllocIds(BTreeSet<AllocId>);
     impl<'tcx> TypeVisitor<'tcx> for CollectAllocIds {
+        fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+            bug!("tcx_for_anon_const_substs called for CollectAllocIds")
+        }
+
         fn visit_const(&mut self, c: &'tcx ty::Const<'tcx>) -> ControlFlow<Self::BreakTy> {
             if let ty::ConstKind::Value(val) = c.val {
                 self.0.extend(alloc_ids_from_const(val));

compiler/rustc_privacy/src/lib.rs

@@ -179,6 +179,10 @@ where
 {
     type BreakTy = V::BreakTy;
 
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.def_id_visitor.tcx()
+    }
+
     fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<V::BreakTy> {
         let tcx = self.def_id_visitor.tcx();
         // InternalSubsts are not visited here because they are visited below in `super_visit_with`.

compiler/rustc_trait_selection/src/opaque_types.rs

@@ -352,6 +352,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
         if !required_region_bounds.is_empty() {
             for required_region in required_region_bounds {
                 concrete_ty.visit_with(&mut ConstrainOpaqueTypeRegionVisitor {
+                    tcx,
                     op: |r| self.sub_regions(infer::CallReturn(span), required_region, r),
                 });
             }
@@ -427,6 +428,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
             }
         }
         concrete_ty.visit_with(&mut ConstrainOpaqueTypeRegionVisitor {
+            tcx,
             op: |r| self.sub_regions(infer::CallReturn(span), least_region, r),
         });
     }
@@ -461,6 +463,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
         );
 
         concrete_ty.visit_with(&mut ConstrainOpaqueTypeRegionVisitor {
+            tcx: self.tcx,
             op: |r| {
                 self.member_constraint(
                     opaque_type_key.def_id,
@@ -546,14 +549,19 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
 //
 // We ignore any type parameters because impl trait values are assumed to
 // capture all the in-scope type parameters.
-struct ConstrainOpaqueTypeRegionVisitor<OP> {
+struct ConstrainOpaqueTypeRegionVisitor<'tcx, OP> {
+    tcx: TyCtxt<'tcx>,
     op: OP,
 }
 
-impl<'tcx, OP> TypeVisitor<'tcx> for ConstrainOpaqueTypeRegionVisitor<OP>
+impl<'tcx, OP> TypeVisitor<'tcx> for ConstrainOpaqueTypeRegionVisitor<'tcx, OP>
 where
     OP: FnMut(ty::Region<'tcx>),
 {
+    fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &ty::Binder<'tcx, T>,

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -771,6 +771,9 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
 
     impl<'tcx> TypeVisitor<'tcx> for IllegalSelfTypeVisitor<'tcx> {
         type BreakTy = ();
+        fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
+            self.tcx
+        }
 
         fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
             match t.kind() {

compiler/rustc_trait_selection/src/traits/structural_match.rs

@@ -130,6 +130,9 @@ impl Search<'a, 'tcx> {
 
 impl<'a, 'tcx> TypeVisitor<'tcx> for Search<'a, 'tcx> {
     type BreakTy = NonStructuralMatchTy<'tcx>;
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.tcx()
+    }
 
     fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         debug!("Search visiting ty: {:?}", ty);

compiler/rustc_traits/src/chalk/lowering.rs

@@ -806,7 +806,7 @@ crate fn collect_bound_vars<'tcx, T: TypeFoldable<'tcx>>(
     tcx: TyCtxt<'tcx>,
     ty: Binder<'tcx, T>,
 ) -> (T, chalk_ir::VariableKinds<RustInterner<'tcx>>, BTreeMap<DefId, u32>) {
-    let mut bound_vars_collector = BoundVarsCollector::new();
+    let mut bound_vars_collector = BoundVarsCollector::new(tcx);
     ty.as_ref().skip_binder().visit_with(&mut bound_vars_collector);
     let mut parameters = bound_vars_collector.parameters;
     let named_parameters: BTreeMap<DefId, u32> = bound_vars_collector
@@ -836,14 +836,16 @@ crate fn collect_bound_vars<'tcx, T: TypeFoldable<'tcx>>(
 }
 
 crate struct BoundVarsCollector<'tcx> {
+    tcx: TyCtxt<'tcx>,
     binder_index: ty::DebruijnIndex,
     crate parameters: BTreeMap<u32, chalk_ir::VariableKind<RustInterner<'tcx>>>,
     crate named_parameters: Vec<DefId>,
 }
 
 impl<'tcx> BoundVarsCollector<'tcx> {
-    crate fn new() -> Self {
+    crate fn new(tcx: TyCtxt<'tcx>) -> Self {
         BoundVarsCollector {
+            tcx,
             binder_index: ty::INNERMOST,
             parameters: BTreeMap::new(),
             named_parameters: vec![],
@@ -852,6 +854,10 @@ impl<'tcx> BoundVarsCollector<'tcx> {
 }
 
 impl<'tcx> TypeVisitor<'tcx> for BoundVarsCollector<'tcx> {
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &Binder<'tcx, T>,
@@ -1070,6 +1076,10 @@ impl PlaceholdersCollector {
 }
 
 impl<'tcx> TypeVisitor<'tcx> for PlaceholdersCollector {
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        bug!("tcx_for_anon_const_substs called for PlaceholdersCollector");
+    }
+
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         match t.kind() {
             ty::Placeholder(p) if p.universe == self.universe_index => {

compiler/rustc_ty_utils/src/instance.rs

@@ -54,6 +54,9 @@ impl<'tcx> BoundVarsCollector<'tcx> {
 impl<'tcx> TypeVisitor<'tcx> for BoundVarsCollector<'tcx> {
     type BreakTy = ();
 
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        bug!("default anon const substs can't be bound vars");
+    }
     fn visit_binder<T: TypeFoldable<'tcx>>(
         &mut self,
         t: &Binder<'tcx, T>,

compiler/rustc_typeck/src/check/check.rs

@@ -470,14 +470,17 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
     debug!(?item, ?span);
 
     struct FoundParentLifetime;
-    struct FindParentLifetimeVisitor<'tcx>(&'tcx ty::Generics);
+    struct FindParentLifetimeVisitor<'tcx>(TyCtxt<'tcx>, &'tcx ty::Generics);
     impl<'tcx> ty::fold::TypeVisitor<'tcx> for FindParentLifetimeVisitor<'tcx> {
         type BreakTy = FoundParentLifetime;
+        fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+            self.0
+        }
 
         fn visit_region(&mut self, r: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
             debug!("FindParentLifetimeVisitor: r={:?}", r);
             if let RegionKind::ReEarlyBound(ty::EarlyBoundRegion { index, .. }) = r {
-                if *index < self.0.parent_count as u32 {
+                if *index < self.1.parent_count as u32 {
                     return ControlFlow::Break(FoundParentLifetime);
                 } else {
                     return ControlFlow::CONTINUE;
@@ -499,21 +502,24 @@ pub(super) fn check_opaque_for_inheriting_lifetimes(
     }
 
     struct ProhibitOpaqueVisitor<'tcx> {
+        tcx: TyCtxt<'tcx>,
         opaque_identity_ty: Ty<'tcx>,
         generics: &'tcx ty::Generics,
-        tcx: TyCtxt<'tcx>,
         selftys: Vec<(Span, Option<String>)>,
     }
 
     impl<'tcx> ty::fold::TypeVisitor<'tcx> for ProhibitOpaqueVisitor<'tcx> {
         type BreakTy = Ty<'tcx>;
+        fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+            self.tcx
+        }
 
         fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
             debug!("check_opaque_for_inheriting_lifetimes: (visit_ty) t={:?}", t);
             if t == self.opaque_identity_ty {
                 ControlFlow::CONTINUE
             } else {
-                t.super_visit_with(&mut FindParentLifetimeVisitor(self.generics))
+                t.super_visit_with(&mut FindParentLifetimeVisitor(self.tcx, self.generics))
                     .map_break(|FoundParentLifetime| t)
             }
         }
@@ -1580,6 +1586,9 @@ fn opaque_type_cycle_error(tcx: TyCtxt<'tcx>, def_id: LocalDefId, span: Span) {
             {
                 struct VisitTypes(Vec<DefId>);
                 impl<'tcx> ty::fold::TypeVisitor<'tcx> for VisitTypes {
+                    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+                        bug!("tcx_for_anon_const_substs called for VisitTypes");
+                    }
                     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
                         match *t.kind() {
                             ty::Opaque(def, _) => {

compiler/rustc_typeck/src/check/op.rs

@@ -428,7 +428,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     }
                 }
                 if let Some(missing_trait) = missing_trait {
-                    let mut visitor = TypeParamVisitor(vec![]);
+                    let mut visitor = TypeParamVisitor(self.tcx, vec![]);
                     visitor.visit_ty(lhs_ty);
 
                     if op.node == hir::BinOpKind::Add
@@ -439,7 +439,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         // This has nothing here because it means we did string
                         // concatenation (e.g., "Hello " + "World!"). This means
                         // we don't want the note in the else clause to be emitted
-                    } else if let [ty] = &visitor.0[..] {
+                    } else if let [ty] = &visitor.1[..] {
                         if let ty::Param(p) = *ty.kind() {
                             // Check if the method would be found if the type param wasn't
                             // involved. If so, it means that adding a trait bound to the param is
@@ -1003,12 +1003,15 @@ fn suggest_constraining_param(
     }
 }
 
-struct TypeParamVisitor<'tcx>(Vec<Ty<'tcx>>);
+struct TypeParamVisitor<'tcx>(TyCtxt<'tcx>, Vec<Ty<'tcx>>);
 
 impl<'tcx> TypeVisitor<'tcx> for TypeParamVisitor<'tcx> {
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.0
+    }
     fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         if let ty::Param(_) = ty.kind() {
-            self.0.push(ty);
+            self.1.push(ty);
         }
         ty.super_visit_with(self)
     }

compiler/rustc_typeck/src/check/wfcheck.rs

@@ -825,12 +825,15 @@ fn check_where_clauses<'tcx, 'fcx>(
         .predicates
         .iter()
         .flat_map(|&(pred, sp)| {
-            #[derive(Default)]
+            struct CountParams<'tcx> {
-            struct CountParams {
+                tcx: TyCtxt<'tcx>,
                 params: FxHashSet<u32>,
             }
-            impl<'tcx> ty::fold::TypeVisitor<'tcx> for CountParams {
+            impl<'tcx> ty::fold::TypeVisitor<'tcx> for CountParams<'tcx> {
                 type BreakTy = ();
+                fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+                    self.tcx
+                }
 
                 fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
                     if let ty::Param(param) = t.kind() {
@@ -850,7 +853,7 @@ fn check_where_clauses<'tcx, 'fcx>(
                     c.super_visit_with(self)
                 }
             }
-            let mut param_count = CountParams::default();
+            let mut param_count = CountParams { tcx: fcx.tcx, params: FxHashSet::default() };
             let has_region = pred.visit_with(&mut param_count).is_break();
             let substituted_pred = pred.subst(tcx, substs);
             // Don't check non-defaulted params, dependent defaults (including lifetimes)

compiler/rustc_typeck/src/collect.rs

@@ -2320,7 +2320,7 @@ fn gather_explicit_predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericP
             tcx,
             &mut predicates,
             trait_ref,
-            &mut cgp::parameters_for_impl(self_ty, trait_ref),
+            &mut cgp::parameters_for_impl(tcx, self_ty, trait_ref),
         );
     }
 

compiler/rustc_typeck/src/constrained_generic_params.rs

@@ -27,12 +27,13 @@ impl From<ty::ParamConst> for Parameter {
 
 /// Returns the set of parameters constrained by the impl header.
 pub fn parameters_for_impl<'tcx>(
+    tcx: TyCtxt<'tcx>,
     impl_self_ty: Ty<'tcx>,
     impl_trait_ref: Option<ty::TraitRef<'tcx>>,
 ) -> FxHashSet<Parameter> {
     let vec = match impl_trait_ref {
-        Some(tr) => parameters_for(&tr, false),
+        Some(tr) => parameters_for(tcx, &tr, false),
-        None => parameters_for(&impl_self_ty, false),
+        None => parameters_for(tcx, &impl_self_ty, false),
     };
     vec.into_iter().collect()
 }
@@ -43,20 +44,26 @@ pub fn parameters_for_impl<'tcx>(
 /// of parameters whose values are needed in order to constrain `ty` - these
 /// differ, with the latter being a superset, in the presence of projections.
 pub fn parameters_for<'tcx>(
+    tcx: TyCtxt<'tcx>,
     t: &impl TypeFoldable<'tcx>,
     include_nonconstraining: bool,
 ) -> Vec<Parameter> {
-    let mut collector = ParameterCollector { parameters: vec![], include_nonconstraining };
+    let mut collector = ParameterCollector { tcx, parameters: vec![], include_nonconstraining };
     t.visit_with(&mut collector);
     collector.parameters
 }
 
-struct ParameterCollector {
+struct ParameterCollector<'tcx> {
+    tcx: TyCtxt<'tcx>,
     parameters: Vec<Parameter>,
     include_nonconstraining: bool,
 }
 
-impl<'tcx> TypeVisitor<'tcx> for ParameterCollector {
+impl<'tcx> TypeVisitor<'tcx> for ParameterCollector<'tcx> {
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.tcx
+    }
+
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
         match *t.kind() {
             ty::Projection(..) | ty::Opaque(..) if !self.include_nonconstraining => {
@@ -198,12 +205,12 @@ pub fn setup_constraining_predicates<'tcx>(
                 //     `<<T as Bar>::Baz as Iterator>::Output = <U as Iterator>::Output`
                 // Then the projection only applies if `T` is known, but it still
                 // does not determine `U`.
-                let inputs = parameters_for(&projection.projection_ty, true);
+                let inputs = parameters_for(tcx, &projection.projection_ty, true);
                 let relies_only_on_inputs = inputs.iter().all(|p| input_parameters.contains(&p));
                 if !relies_only_on_inputs {
                     continue;
                 }
-                input_parameters.extend(parameters_for(&projection.ty, false));
+                input_parameters.extend(parameters_for(tcx, &projection.ty, false));
             } else {
                 continue;
             }

compiler/rustc_typeck/src/impl_wf_check.rs

@@ -119,7 +119,7 @@ fn enforce_impl_params_are_constrained(
     let impl_predicates = tcx.predicates_of(impl_def_id);
     let impl_trait_ref = tcx.impl_trait_ref(impl_def_id);
 
-    let mut input_parameters = cgp::parameters_for_impl(impl_self_ty, impl_trait_ref);
+    let mut input_parameters = cgp::parameters_for_impl(tcx, impl_self_ty, impl_trait_ref);
     cgp::identify_constrained_generic_params(
         tcx,
         impl_predicates,
@@ -136,7 +136,7 @@ fn enforce_impl_params_are_constrained(
             match item.kind {
                 ty::AssocKind::Type => {
                     if item.defaultness.has_value() {
-                        cgp::parameters_for(&tcx.type_of(def_id), true)
+                        cgp::parameters_for(tcx, &tcx.type_of(def_id), true)
                     } else {
                         Vec::new()
                     }

compiler/rustc_typeck/src/impl_wf_check/min_specialization.rs

@@ -207,15 +207,15 @@ fn unconstrained_parent_impl_substs<'tcx>(
                 continue;
             }
 
-            unconstrained_parameters.extend(cgp::parameters_for(&projection_ty, true));
+            unconstrained_parameters.extend(cgp::parameters_for(tcx, &projection_ty, true));
 
-            for param in cgp::parameters_for(&projected_ty, false) {
+            for param in cgp::parameters_for(tcx, &projected_ty, false) {
                 if !unconstrained_parameters.contains(&param) {
                     constrained_params.insert(param.0);
                 }
             }
 
-            unconstrained_parameters.extend(cgp::parameters_for(&projected_ty, true));
+            unconstrained_parameters.extend(cgp::parameters_for(tcx, &projected_ty, true));
         }
     }
 
@@ -249,7 +249,7 @@ fn check_duplicate_params<'tcx>(
     parent_substs: &Vec<GenericArg<'tcx>>,
     span: Span,
 ) {
-    let mut base_params = cgp::parameters_for(parent_substs, true);
+    let mut base_params = cgp::parameters_for(tcx, parent_substs, true);
     base_params.sort_by_key(|param| param.0);
     if let (_, [duplicate, ..]) = base_params.partition_dedup() {
         let param = impl1_substs[duplicate.0 as usize];

src/tools/clippy/clippy_lints/src/redundant_clone.rs

@@ -14,7 +14,7 @@ use rustc_middle::mir::{
     visit::{MutatingUseContext, NonMutatingUseContext, PlaceContext, Visitor as _},
     Mutability,
 };
-use rustc_middle::ty::{self, fold::TypeVisitor, Ty};
+use rustc_middle::ty::{self, fold::TypeVisitor, Ty, TyCtxt};
 use rustc_mir::dataflow::{Analysis, AnalysisDomain, GenKill, GenKillAnalysis, ResultsCursor};
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::{BytePos, Span};
@@ -576,7 +576,7 @@ impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'tcx> {
                 self.possible_borrower.add(borrowed.local, lhs);
             },
             other => {
-                if ContainsRegion
+                if ContainsRegion(self.cx.tcx)
                     .visit_ty(place.ty(&self.body.local_decls, self.cx.tcx).ty)
                     .is_continue()
                 {
@@ -625,7 +625,7 @@ impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleBorrowerVisitor<'a, 'tcx> {
                 .flat_map(HybridBitSet::iter)
                 .collect();
 
-            if ContainsRegion.visit_ty(self.body.local_decls[*dest].ty).is_break() {
+            if ContainsRegion(self.cx.tcx).visit_ty(self.body.local_decls[*dest].ty).is_break() {
                 mutable_variables.push(*dest);
             }
 
@@ -701,12 +701,15 @@ impl<'a, 'tcx> mir::visit::Visitor<'tcx> for PossibleOriginVisitor<'a, 'tcx> {
     }
 }
 
-struct ContainsRegion;
+struct ContainsRegion<'tcx>(TyCtxt<'tcx>);
 
-impl TypeVisitor<'_> for ContainsRegion {
+impl<'tcx> TypeVisitor<'tcx> for ContainsRegion<'tcx> {
     type BreakTy = ();
+    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
+        self.0
+    }
 
-    fn visit_region(&mut self, _: ty::Region<'_>) -> ControlFlow<Self::BreakTy> {
+    fn visit_region(&mut self, _: ty::Region<'tcx>) -> ControlFlow<Self::BreakTy> {
         ControlFlow::BREAK
     }
 }