Convert predicates into Predicate in the Obligation constructor

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -7,9 +7,7 @@ use rustc_infer::infer::{DefiningAnchor, InferCtxt};
 use rustc_infer::traits::{Obligation, ObligationCause};
 use rustc_middle::ty::subst::{GenericArgKind, InternalSubsts};
 use rustc_middle::ty::visit::TypeVisitable;
-use rustc_middle::ty::{
-    self, OpaqueHiddenType, OpaqueTypeKey, ToPredicate, Ty, TyCtxt, TypeFoldable,
-};
+use rustc_middle::ty::{self, OpaqueHiddenType, OpaqueTypeKey, Ty, TyCtxt, TypeFoldable};
 use rustc_span::Span;
 use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
 use rustc_trait_selection::traits::ObligationCtxt;
@@ -256,8 +254,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
         // Require the hidden type to be well-formed with only the generics of the opaque type.
         // Defining use functions may have more bounds than the opaque type, which is ok, as long as the
         // hidden type is well formed even without those bounds.
-        let predicate = ty::Binder::dummy(ty::PredicateKind::WellFormed(definition_ty.into()))
-            .to_predicate(infcx.tcx);
+        let predicate = ty::Binder::dummy(ty::PredicateKind::WellFormed(definition_ty.into()));
 
         let id_substs = InternalSubsts::identity_for_item(self.tcx, def_id.to_def_id());
 
@@ -282,6 +279,7 @@ impl<'tcx> InferCtxtExt<'tcx> for InferCtxt<'tcx> {
         }
 
         ocx.register_obligation(Obligation::misc(
+            infcx.tcx,
             instantiated_ty.span,
             body_id,
             param_env,

compiler/rustc_borrowck/src/type_check/canonical.rs

@@ -92,8 +92,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                 trait_ref,
                 constness: ty::BoundConstness::NotConst,
                 polarity: ty::ImplPolarity::Positive,
-            }))
-            .to_predicate(self.tcx()),
+            })),
             locations,
             category,
         );
@@ -122,26 +121,26 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
 
     pub(super) fn prove_predicates(
         &mut self,
-        predicates: impl IntoIterator<Item = impl ToPredicate<'tcx, ty::Predicate<'tcx>>>,
+        predicates: impl IntoIterator<
+            Item = impl ToPredicate<'tcx, ty::Predicate<'tcx>> + std::fmt::Debug,
+        >,
         locations: Locations,
         category: ConstraintCategory<'tcx>,
     ) {
         for predicate in predicates {
-            let predicate = predicate.to_predicate(self.tcx());
-            debug!("prove_predicates(predicate={:?}, locations={:?})", predicate, locations,);
-
             self.prove_predicate(predicate, locations, category);
         }
     }
 
     #[instrument(skip(self), level = "debug")]
     pub(super) fn prove_predicate(
         &mut self,
-        predicate: ty::Predicate<'tcx>,
+        predicate: impl ToPredicate<'tcx, ty::Predicate<'tcx>> + std::fmt::Debug,
         locations: Locations,
         category: ConstraintCategory<'tcx>,
     ) {
         let param_env = self.param_env;
+        let predicate = predicate.to_predicate(self.tcx());
         self.fully_perform_op(
             locations,
             category,

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -33,8 +33,7 @@ use rustc_middle::ty::subst::{SubstsRef, UserSubsts};
 use rustc_middle::ty::visit::TypeVisitable;
 use rustc_middle::ty::{
     self, Binder, CanonicalUserTypeAnnotation, CanonicalUserTypeAnnotations, Dynamic,
-    OpaqueHiddenType, OpaqueTypeKey, RegionVid, ToPredicate, Ty, TyCtxt, UserType,
-    UserTypeAnnotationIndex,
+    OpaqueHiddenType, OpaqueTypeKey, RegionVid, Ty, TyCtxt, UserType, UserTypeAnnotationIndex,
 };
 use rustc_span::def_id::CRATE_DEF_ID;
 use rustc_span::{Span, DUMMY_SP};
@@ -1069,8 +1068,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                     }
 
                     self.prove_predicate(
-                        ty::Binder::dummy(ty::PredicateKind::WellFormed(inferred_ty.into()))
-                            .to_predicate(self.tcx()),
+                        ty::Binder::dummy(ty::PredicateKind::WellFormed(inferred_ty.into())),
                         Locations::All(span),
                         ConstraintCategory::TypeAnnotation,
                     );

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -732,7 +732,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                         polarity: ty::ImplPolarity::Positive,
                     });
                     let obligation =
-                        Obligation::new(ObligationCause::dummy(), param_env, poly_trait_pred);
+                        Obligation::new(tcx, ObligationCause::dummy(), param_env, poly_trait_pred);
 
                     let implsrc = {
                         let infcx = tcx.infer_ctxt().build();
@@ -816,6 +816,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
 
                             if !nonconst_call_permission {
                                 let obligation = Obligation::new(
+                                    tcx,
                                     ObligationCause::dummy_with_span(*fn_span),
                                     param_env,
                                     tcx.mk_predicate(

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -147,6 +147,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                 }
                 Adt(..) => {
                     let obligation = Obligation::new(
+                        tcx,
                         ObligationCause::dummy(),
                         param_env,
                         Binder::dummy(TraitPredicate {

compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs

@@ -156,6 +156,7 @@ impl Qualif for NeedsNonConstDrop {
         let destruct = cx.tcx.require_lang_item(LangItem::Destruct, None);
 
         let obligation = Obligation::new(
+            cx.tcx,
             ObligationCause::dummy(),
             cx.param_env,
             ty::Binder::dummy(ty::TraitPredicate {

compiler/rustc_hir_analysis/src/check/check.rs

@@ -19,9 +19,7 @@ use rustc_middle::middle::stability::EvalResult;
 use rustc_middle::ty::layout::{LayoutError, MAX_SIMD_LANES};
 use rustc_middle::ty::subst::GenericArgKind;
 use rustc_middle::ty::util::{Discr, IntTypeExt};
-use rustc_middle::ty::{
-    self, ParamEnv, ToPredicate, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable,
-};
+use rustc_middle::ty::{self, ParamEnv, Ty, TyCtxt, TypeSuperVisitable, TypeVisitable};
 use rustc_session::lint::builtin::{UNINHABITED_STATIC, UNSUPPORTED_CALLING_CONVENTIONS};
 use rustc_span::symbol::sym;
 use rustc_span::{self, Span};
@@ -464,9 +462,8 @@ fn check_opaque_meets_bounds<'tcx>(
     // Additionally require the hidden type to be well-formed with only the generics of the opaque type.
     // Defining use functions may have more bounds than the opaque type, which is ok, as long as the
     // hidden type is well formed even without those bounds.
-    let predicate =
-        ty::Binder::dummy(ty::PredicateKind::WellFormed(hidden_ty.into())).to_predicate(tcx);
-    ocx.register_obligation(Obligation::new(misc_cause, param_env, predicate));
+    let predicate = ty::Binder::dummy(ty::PredicateKind::WellFormed(hidden_ty.into()));
+    ocx.register_obligation(Obligation::new(tcx, misc_cause, param_env, predicate));
 
     // Check that all obligations are satisfied by the implementation's
     // version.

compiler/rustc_hir_analysis/src/check/compare_method.rs

@@ -238,7 +238,7 @@ fn compare_predicate_entailment<'tcx>(
                 kind: impl_m.kind,
             },
         );
-        ocx.register_obligation(traits::Obligation::new(cause, param_env, predicate));
+        ocx.register_obligation(traits::Obligation::new(tcx, cause, param_env, predicate));
     }
 
     // We now need to check that the signature of the impl method is
@@ -605,6 +605,7 @@ impl<'tcx> TypeFolder<'tcx> for ImplTraitInTraitCollector<'_, 'tcx> {
                 );
 
                 self.ocx.register_obligation(traits::Obligation::new(
+                    self.tcx(),
                     ObligationCause::new(
                         self.span,
                         self.body_id,
@@ -1579,7 +1580,7 @@ fn compare_type_predicate_entailment<'tcx>(
             },
         );
         ocx.register_obligations(obligations);
-        ocx.register_obligation(traits::Obligation::new(cause, param_env, predicate));
+        ocx.register_obligation(traits::Obligation::new(tcx, cause, param_env, predicate));
     }
 
     // Check that all obligations are satisfied by the implementation's
@@ -1784,7 +1785,7 @@ pub fn check_type_bounds<'tcx>(
         .subst_iter_copied(tcx, rebased_substs)
         .map(|(concrete_ty_bound, span)| {
             debug!("check_type_bounds: concrete_ty_bound = {:?}", concrete_ty_bound);
-            traits::Obligation::new(mk_cause(span), param_env, concrete_ty_bound)
+            traits::Obligation::new(tcx, mk_cause(span), param_env, concrete_ty_bound)
         })
         .collect();
     debug!("check_type_bounds: item_bounds={:?}", obligations);

compiler/rustc_hir_analysis/src/check/wfcheck.rs

@@ -14,8 +14,8 @@ use rustc_middle::mir::ConstraintCategory;
 use rustc_middle::ty::query::Providers;
 use rustc_middle::ty::trait_def::TraitSpecializationKind;
 use rustc_middle::ty::{
-    self, AdtKind, DefIdTree, GenericParamDefKind, ToPredicate, Ty, TyCtxt, TypeFoldable,
-    TypeSuperVisitable, TypeVisitable, TypeVisitor,
+    self, AdtKind, DefIdTree, GenericParamDefKind, Ty, TyCtxt, TypeFoldable, TypeSuperVisitable,
+    TypeVisitable, TypeVisitor,
 };
 use rustc_middle::ty::{GenericArgKind, InternalSubsts};
 use rustc_session::parse::feature_err;
@@ -75,9 +75,10 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
         // for a type to be WF, we do not need to check if const trait predicates satisfy.
         let param_env = self.param_env.without_const();
         self.ocx.register_obligation(traits::Obligation::new(
+            self.tcx(),
             cause,
             param_env,
-            ty::Binder::dummy(ty::PredicateKind::WellFormed(arg)).to_predicate(self.tcx()),
+            ty::Binder::dummy(ty::PredicateKind::WellFormed(arg)),
         ));
     }
 }
@@ -1111,12 +1112,12 @@ fn check_type_defn<'tcx>(tcx: TyCtxt<'tcx>, item: &hir::Item<'tcx>, all_sized: b
                     traits::MiscObligation,
                 );
                 wfcx.register_obligation(traits::Obligation::new(
+                    tcx,
                     cause,
                     wfcx.param_env,
                     ty::Binder::dummy(ty::PredicateKind::ConstEvaluatable(
                         ty::Const::from_anon_const(tcx, discr_def_id.expect_local()),
-                    ))
-                    .to_predicate(tcx),
+                    )),
                 ));
             }
         }
@@ -1453,7 +1454,7 @@ fn check_where_clauses<'tcx>(wfcx: &WfCheckingCtxt<'_, 'tcx>, span: Span, def_id
                 wfcx.body_id,
                 traits::ItemObligation(def_id.to_def_id()),
             );
-            traits::Obligation::new(cause, wfcx.param_env, pred)
+            traits::Obligation::new(tcx, cause, wfcx.param_env, pred)
         });
 
     let predicates = predicates.0.instantiate_identity(tcx);
@@ -1783,8 +1784,7 @@ fn receiver_is_implemented<'tcx>(
         substs: tcx.mk_substs_trait(receiver_ty, &[]),
     });
 
-    let obligation =
-        traits::Obligation::new(cause, wfcx.param_env, trait_ref.without_const().to_predicate(tcx));
+    let obligation = traits::Obligation::new(tcx, cause, wfcx.param_env, trait_ref.without_const());
 
     if wfcx.infcx.predicate_must_hold_modulo_regions(&obligation) {
         true
@@ -1931,6 +1931,7 @@ impl<'tcx> WfCheckingCtxt<'_, 'tcx> {
                 }
 
                 let obligation = traits::Obligation::new(
+                    tcx,
                     traits::ObligationCause::new(span, self.body_id, traits::TrivialBound),
                     empty_env,
                     pred,

compiler/rustc_hir_analysis/src/hir_wf_check.rs

@@ -5,7 +5,7 @@ use rustc_hir::{ForeignItem, ForeignItemKind, HirId};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::traits::{ObligationCause, WellFormedLoc};
 use rustc_middle::ty::query::Providers;
-use rustc_middle::ty::{self, Region, ToPredicate, TyCtxt, TypeFoldable, TypeFolder};
+use rustc_middle::ty::{self, Region, TyCtxt, TypeFoldable, TypeFolder};
 use rustc_trait_selection::traits;
 
 pub fn provide(providers: &mut Providers) {
@@ -74,10 +74,10 @@ fn diagnostic_hir_wf_check<'tcx>(
             let errors = traits::fully_solve_obligation(
                 &infcx,
                 traits::Obligation::new(
+                    self.tcx,
                     cause,
                     self.param_env,
-                    ty::Binder::dummy(ty::PredicateKind::WellFormed(tcx_ty.into()))
-                        .to_predicate(self.tcx),
+                    ty::Binder::dummy(ty::PredicateKind::WellFormed(tcx_ty.into())),
                 ),
             );
             if !errors.is_empty() {

compiler/rustc_hir_typeck/src/_match.rs

@@ -4,7 +4,7 @@ use rustc_errors::{Applicability, Diagnostic, MultiSpan};
 use rustc_hir::{self as hir, ExprKind};
 use rustc_infer::infer::type_variable::{TypeVariableOrigin, TypeVariableOriginKind};
 use rustc_infer::traits::Obligation;
-use rustc_middle::ty::{self, ToPredicate, Ty};
+use rustc_middle::ty::{self, Ty};
 use rustc_span::Span;
 use rustc_trait_selection::traits::query::evaluate_obligation::InferCtxtExt;
 use rustc_trait_selection::traits::{
@@ -538,23 +538,24 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         .bound_explicit_item_bounds(rpit_def_id)
                         .subst_iter_copied(self.tcx, substs)
                     {
-                        let pred = match pred.kind().skip_binder() {
+                        let pred = pred.kind().rebind(match pred.kind().skip_binder() {
                             ty::PredicateKind::Trait(mut trait_pred) => {
                                 assert_eq!(trait_pred.trait_ref.self_ty(), opaque_ty);
                                 trait_pred.trait_ref.substs =
                                     self.tcx.mk_substs_trait(ty, &trait_pred.trait_ref.substs[1..]);
-                                pred.kind().rebind(trait_pred).to_predicate(self.tcx)
+                                ty::PredicateKind::Trait(trait_pred)
                             }
                             ty::PredicateKind::Projection(mut proj_pred) => {
                                 assert_eq!(proj_pred.projection_ty.self_ty(), opaque_ty);
                                 proj_pred.projection_ty.substs = self
                                     .tcx
                                     .mk_substs_trait(ty, &proj_pred.projection_ty.substs[1..]);
-                                pred.kind().rebind(proj_pred).to_predicate(self.tcx)
+                                ty::PredicateKind::Projection(proj_pred)
                             }
                             _ => continue,
-                        };
+                        });
                         if !self.predicate_must_hold_modulo_regions(&Obligation::new(
+                            self.tcx,
                             ObligationCause::misc(span, self.body_id),
                             self.param_env,
                             pred,

compiler/rustc_hir_typeck/src/callee.rs

@@ -380,6 +380,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         predicates.predicates.iter().zip(&predicates.spans)
                     {
                         let obligation = Obligation::new(
+                            self.tcx,
                             ObligationCause::dummy_with_span(callee_expr.span),
                             self.param_env,
                             *predicate,

compiler/rustc_hir_typeck/src/coercion.rs

@@ -55,7 +55,7 @@ use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::relate::RelateResult;
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::visit::TypeVisitable;
-use rustc_middle::ty::{self, ToPredicate, Ty, TypeAndMut};
+use rustc_middle::ty::{self, Ty, TypeAndMut};
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::sym;
 use rustc_span::{self, BytePos, DesugaringKind, Span};
@@ -278,13 +278,13 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
             for &source_ty in &[a, b] {
                 if source_ty != target_ty {
                     obligations.push(Obligation::new(
+                        self.tcx(),
                         self.cause.clone(),
                         self.param_env,
                         ty::Binder::dummy(ty::PredicateKind::Coerce(ty::CoercePredicate {
                             a: source_ty,
                             b: target_ty,
-                        }))
-                        .to_predicate(self.tcx()),
+                        })),
                     ));
                 }
             }
@@ -669,7 +669,7 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
                     continue;
                 }
             };
-            match selcx.select(&obligation.with(trait_pred)) {
+            match selcx.select(&obligation.with(selcx.tcx(), trait_pred)) {
                 // Uncertain or unimplemented.
                 Ok(None) => {
                     if trait_pred.def_id() == unsize_did {
@@ -783,10 +783,11 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
                 // and then require that the resulting predicate (e.g., `usize: Clone`)
                 // holds (it does).
                 let predicate = predicate.with_self_ty(self.tcx, a);
-                Obligation::new(self.cause.clone(), self.param_env, predicate)
+                Obligation::new(self.tcx, self.cause.clone(), self.param_env, predicate)
             })
             // Enforce the region bound (e.g., `usize: 'static`, in our example).
             .chain([Obligation::new(
+                self.tcx,
                 self.cause.clone(),
                 self.param_env,
                 self.tcx.mk_predicate(ty::Binder::dummy(ty::PredicateKind::TypeOutlives(

compiler/rustc_hir_typeck/src/fn_ctxt/_impl.rs

@@ -22,8 +22,7 @@ use rustc_middle::ty::error::TypeError;
 use rustc_middle::ty::fold::TypeFoldable;
 use rustc_middle::ty::visit::TypeVisitable;
 use rustc_middle::ty::{
-    self, AdtKind, CanonicalUserType, DefIdTree, EarlyBinder, GenericParamDefKind, ToPredicate, Ty,
-    UserType,
+    self, AdtKind, CanonicalUserType, DefIdTree, EarlyBinder, GenericParamDefKind, Ty, UserType,
 };
 use rustc_middle::ty::{GenericArgKind, InternalSubsts, SubstsRef, UserSelfTy, UserSubsts};
 use rustc_session::lint;
@@ -562,9 +561,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         // WF obligations never themselves fail, so no real need to give a detailed cause:
         let cause = traits::ObligationCause::new(span, self.body_id, code);
         self.register_predicate(traits::Obligation::new(
+            self.tcx,
             cause,
             self.param_env,
-            ty::Binder::dummy(ty::PredicateKind::WellFormed(arg)).to_predicate(self.tcx),
+            ty::Binder::dummy(ty::PredicateKind::WellFormed(arg)),
         ));
     }
 

compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -2150,6 +2150,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             ),
                         );
                         let obligation = traits::Obligation::new(
+                            self.tcx,
                             traits::ObligationCause::dummy(),
                             self.param_env,
                             ty::Binder::dummy(ty::TraitPredicate {