Simplify a bunch of trait ref obligation creations

3 files changed, 9 insertions, 22 deletions

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 4564a6c4f2f..d4cee305387 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/check.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/check.rs
@@ -10,7 +10,7 @@ use rustc_middle::mir::visit::{MutatingUseContext, NonMutatingUseContext, PlaceC
 use rustc_middle::mir::*;
 use rustc_middle::ty::subst::{GenericArgKind, InternalSubsts};
 use rustc_middle::ty::{self, adjustment::PointerCast, Instance, InstanceDef, Ty, TyCtxt};
-use rustc_middle::ty::{Binder, TraitPredicate, TraitRef, TypeVisitable};
+use rustc_middle::ty::{Binder, TraitRef, TypeVisitable};
 use rustc_mir_dataflow::{self, Analysis};
 use rustc_span::{sym, Span, Symbol};
 use rustc_trait_selection::traits::error_reporting::TypeErrCtxtExt as _;
@@ -735,11 +735,8 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                     }
 
                     let trait_ref = TraitRef::from_method(tcx, trait_id, substs);
-                    let poly_trait_pred = Binder::dummy(TraitPredicate {
-                        trait_ref,
-                        constness: ty::BoundConstness::ConstIfConst,
-                        polarity: ty::ImplPolarity::Positive,
-                    });
+                    let poly_trait_pred =
+                        Binder::dummy(trait_ref).with_constness(ty::BoundConstness::ConstIfConst);
                     let obligation =
                         Obligation::new(tcx, ObligationCause::dummy(), param_env, poly_trait_pred);
 
@@ -828,9 +825,7 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
                                     tcx,
                                     ObligationCause::dummy_with_span(*fn_span),
                                     param_env,
-                                    tcx.mk_predicate(
-                                        poly_trait_pred.map_bound(ty::PredicateKind::Trait),
-                                    ),
+                                    poly_trait_pred,
                                 );
 
                                 // improve diagnostics by showing what failed. Our requirements are stricter this time
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/ops.rs b/compiler/rustc_const_eval/src/transform/check_consts/ops.rs
index c62c6651587..bfc950eff5c 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/ops.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/ops.rs
@@ -13,10 +13,9 @@ use rustc_middle::mir;
 use rustc_middle::ty::print::with_no_trimmed_paths;
 use rustc_middle::ty::subst::{GenericArgKind, SubstsRef};
 use rustc_middle::ty::{
-    suggest_constraining_type_param, Adt, Closure, DefIdTree, FnDef, FnPtr, Param, TraitPredicate,
-    Ty,
+    suggest_constraining_type_param, Adt, Closure, DefIdTree, FnDef, FnPtr, Param, Ty,
 };
-use rustc_middle::ty::{Binder, BoundConstness, ImplPolarity, TraitRef};
+use rustc_middle::ty::{Binder, TraitRef};
 use rustc_session::parse::feature_err;
 use rustc_span::symbol::sym;
 use rustc_span::{BytePos, Pos, Span, Symbol};
@@ -150,11 +149,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                         tcx,
                         ObligationCause::dummy(),
                         param_env,
-                        Binder::dummy(TraitPredicate {
-                            trait_ref,
-                            constness: BoundConstness::NotConst,
-                            polarity: ImplPolarity::Positive,
-                        }),
+                        Binder::dummy(trait_ref),
                     );
 
                     let infcx = tcx.infer_ctxt().build();
diff --git a/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs b/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs
index e7b3df9b728..8ca3fdf400e 100644
--- a/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs
+++ b/compiler/rustc_const_eval/src/transform/check_consts/qualifs.rs
@@ -157,11 +157,8 @@ impl Qualif for NeedsNonConstDrop {
             cx.tcx,
             ObligationCause::dummy_with_span(cx.body.span),
             cx.param_env,
-            ty::Binder::dummy(ty::TraitPredicate {
-                trait_ref: cx.tcx.at(cx.body.span).mk_trait_ref(LangItem::Destruct, [ty]),
-                constness: ty::BoundConstness::ConstIfConst,
-                polarity: ty::ImplPolarity::Positive,
-            }),
+            ty::Binder::dummy(cx.tcx.at(cx.body.span).mk_trait_ref(LangItem::Destruct, [ty]))
+                .with_constness(ty::BoundConstness::ConstIfConst),
         );
 
         let infcx = cx.tcx.infer_ctxt().build();