4 files changed, 16 insertions, 39 deletions
diff --git a/compiler/rustc_middle/src/infer/canonical.rs b/compiler/rustc_middle/src/infer/canonical.rs
index 49bf03e9c75..dba71d88f40 100644
--- a/compiler/rustc_middle/src/infer/canonical.rs
+++ b/compiler/rustc_middle/src/infer/canonical.rs
@@ -32,7 +32,7 @@ use std::collections::hash_map::Entry;
 use crate::infer::MemberConstraint;
 use crate::mir::ConstraintCategory;
 use crate::ty::GenericArg;
-use crate::ty::{self, List, Region, Ty, TyCtxt, TypeFlags, TypeVisitableExt};
+use crate::ty::{self, List, Ty, TyCtxt, TypeFlags, TypeVisitableExt};
 
 pub type Canonical<'tcx, V> = ir::Canonical<TyCtxt<'tcx>, V>;
 pub type CanonicalVarInfo<'tcx> = ir::CanonicalVarInfo<TyCtxt<'tcx>>;
@@ -141,7 +141,7 @@ impl<'tcx, R> QueryResponse<'tcx, R> {
 }
 
 pub type QueryOutlivesConstraint<'tcx> =
-    (ty::OutlivesPredicate<GenericArg<'tcx>, Region<'tcx>>, ConstraintCategory<'tcx>);
+    (ty::OutlivesPredicate<'tcx, GenericArg<'tcx>>, ConstraintCategory<'tcx>);
 
 TrivialTypeTraversalImpls! {
     crate::infer::canonical::Certainty,
diff --git a/compiler/rustc_middle/src/ty/context.rs b/compiler/rustc_middle/src/ty/context.rs
index a457319c5f8..896114e2483 100644
--- a/compiler/rustc_middle/src/ty/context.rs
+++ b/compiler/rustc_middle/src/ty/context.rs
@@ -121,7 +121,6 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type Abi = abi::Abi;
 
     type Const = ty::Const<'tcx>;
-    type AliasConst = ty::UnevaluatedConst<'tcx>;
     type PlaceholderConst = ty::PlaceholderConst;
     type ParamConst = ty::ParamConst;
     type BoundConst = ty::BoundVar;
@@ -137,15 +136,6 @@ impl<'tcx> Interner for TyCtxt<'tcx> {
     type ParamEnv = ty::ParamEnv<'tcx>;
     type Predicate = Predicate<'tcx>;
     type Clause = Clause<'tcx>;
-    type TraitPredicate = ty::TraitPredicate<'tcx>;
-    type RegionOutlivesPredicate = ty::RegionOutlivesPredicate<'tcx>;
-    type TypeOutlivesPredicate = ty::TypeOutlivesPredicate<'tcx>;
-    type ProjectionPredicate = ty::ProjectionPredicate<'tcx>;
-    type NormalizesTo = ty::NormalizesTo<'tcx>;
-    type SubtypePredicate = ty::SubtypePredicate<'tcx>;
-
-    type CoercePredicate = ty::CoercePredicate<'tcx>;
-    type ClosureKind = ty::ClosureKind;
 
     type Clauses = ty::Clauses<'tcx>;
 
diff --git a/compiler/rustc_middle/src/ty/predicate.rs b/compiler/rustc_middle/src/ty/predicate.rs
index 067d490078d..293cc0a7eca 100644
--- a/compiler/rustc_middle/src/ty/predicate.rs
+++ b/compiler/rustc_middle/src/ty/predicate.rs
@@ -1,9 +1,7 @@
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::intern::Interned;
 use rustc_hir::def_id::DefId;
-use rustc_macros::{
-    extension, HashStable, Lift, TyDecodable, TyEncodable, TypeFoldable, TypeVisitable,
-};
+use rustc_macros::{extension, HashStable};
 use rustc_type_ir as ir;
 use std::cmp::Ordering;
 
@@ -24,6 +22,15 @@ pub type PredicateKind<'tcx> = ir::PredicateKind<TyCtxt<'tcx>>;
 pub type NormalizesTo<'tcx> = ir::NormalizesTo<TyCtxt<'tcx>>;
 pub type CoercePredicate<'tcx> = ir::CoercePredicate<TyCtxt<'tcx>>;
 pub type SubtypePredicate<'tcx> = ir::SubtypePredicate<TyCtxt<'tcx>>;
+pub type OutlivesPredicate<'tcx, T> = ir::OutlivesPredicate<TyCtxt<'tcx>, T>;
+pub type RegionOutlivesPredicate<'tcx> = OutlivesPredicate<'tcx, ty::Region<'tcx>>;
+pub type TypeOutlivesPredicate<'tcx> = OutlivesPredicate<'tcx, Ty<'tcx>>;
+pub type PolyTraitPredicate<'tcx> = ty::Binder<'tcx, TraitPredicate<'tcx>>;
+pub type PolyRegionOutlivesPredicate<'tcx> = ty::Binder<'tcx, RegionOutlivesPredicate<'tcx>>;
+pub type PolyTypeOutlivesPredicate<'tcx> = ty::Binder<'tcx, TypeOutlivesPredicate<'tcx>>;
+pub type PolySubtypePredicate<'tcx> = ty::Binder<'tcx, SubtypePredicate<'tcx>>;
+pub type PolyCoercePredicate<'tcx> = ty::Binder<'tcx, CoercePredicate<'tcx>>;
+pub type PolyProjectionPredicate<'tcx> = ty::Binder<'tcx, ProjectionPredicate<'tcx>>;
 
 /// A statement that can be proven by a trait solver. This includes things that may
 /// show up in where clauses, such as trait predicates and projection predicates,
@@ -405,20 +412,6 @@ impl<'tcx> Clause<'tcx> {
     }
 }
 
-pub type PolyTraitPredicate<'tcx> = ty::Binder<'tcx, TraitPredicate<'tcx>>;
-
-/// `A: B`
-#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
-#[derive(HashStable, TypeFoldable, TypeVisitable, Lift)]
-pub struct OutlivesPredicate<A, B>(pub A, pub B);
-pub type RegionOutlivesPredicate<'tcx> = OutlivesPredicate<ty::Region<'tcx>, ty::Region<'tcx>>;
-pub type TypeOutlivesPredicate<'tcx> = OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>>;
-pub type PolyRegionOutlivesPredicate<'tcx> = ty::Binder<'tcx, RegionOutlivesPredicate<'tcx>>;
-pub type PolyTypeOutlivesPredicate<'tcx> = ty::Binder<'tcx, TypeOutlivesPredicate<'tcx>>;
-pub type PolySubtypePredicate<'tcx> = ty::Binder<'tcx, SubtypePredicate<'tcx>>;
-pub type PolyCoercePredicate<'tcx> = ty::Binder<'tcx, CoercePredicate<'tcx>>;
-pub type PolyProjectionPredicate<'tcx> = Binder<'tcx, ProjectionPredicate<'tcx>>;
-
 pub trait ToPolyTraitRef<'tcx> {
     fn to_poly_trait_ref(&self) -> PolyTraitRef<'tcx>;
 }
@@ -545,10 +538,8 @@ impl<'tcx> UpcastFrom<TyCtxt<'tcx>, PolyRegionOutlivesPredicate<'tcx>> for Predi
     }
 }
 
-impl<'tcx> UpcastFrom<TyCtxt<'tcx>, OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>>>
-    for Predicate<'tcx>
-{
-    fn upcast_from(from: OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>>, tcx: TyCtxt<'tcx>) -> Self {
+impl<'tcx> UpcastFrom<TyCtxt<'tcx>, TypeOutlivesPredicate<'tcx>> for Predicate<'tcx> {
+    fn upcast_from(from: TypeOutlivesPredicate<'tcx>, tcx: TyCtxt<'tcx>) -> Self {
         ty::Binder::dummy(PredicateKind::Clause(ClauseKind::TypeOutlives(from))).upcast(tcx)
     }
 }
diff --git a/compiler/rustc_middle/src/ty/print/pretty.rs b/compiler/rustc_middle/src/ty/print/pretty.rs
index f0bd071e451..a1ead1bb59f 100644
--- a/compiler/rustc_middle/src/ty/print/pretty.rs
+++ b/compiler/rustc_middle/src/ty/print/pretty.rs
@@ -2860,10 +2860,9 @@ where
     }
 }
 
-impl<'tcx, T, U, P: PrettyPrinter<'tcx>> Print<'tcx, P> for ty::OutlivesPredicate<T, U>
+impl<'tcx, T, P: PrettyPrinter<'tcx>> Print<'tcx, P> for ty::OutlivesPredicate<'tcx, T>
 where
     T: Print<'tcx, P>,
-    U: Print<'tcx, P>,
 {
     fn print(&self, cx: &mut P) -> Result<(), PrintError> {
         define_scoped_cx!(cx);
@@ -3016,10 +3015,7 @@ forward_display_to_print! {
     ty::Region<'tcx>,
     Ty<'tcx>,
     &'tcx ty::List<ty::PolyExistentialPredicate<'tcx>>,
-    ty::Const<'tcx>,
-
-    ty::OutlivesPredicate<Ty<'tcx>, ty::Region<'tcx>>,
-    ty::OutlivesPredicate<ty::Region<'tcx>, ty::Region<'tcx>>
+    ty::Const<'tcx>
 }
 
 define_print! {