1 files changed, 4 insertions, 6 deletions
diff --git a/compiler/rustc_trait_selection/src/traits/util.rs b/compiler/rustc_trait_selection/src/traits/util.rs
index 87c534bad96..895b84fd7e9 100644
--- a/compiler/rustc_trait_selection/src/traits/util.rs
+++ b/compiler/rustc_trait_selection/src/traits/util.rs
@@ -238,10 +238,9 @@ pub fn predicate_for_trait_def<'tcx>(
     cause: ObligationCause<'tcx>,
     trait_def_id: DefId,
     recursion_depth: usize,
-    self_ty: Ty<'tcx>,
-    params: impl IntoIterator<Item = GenericArg<'tcx>, IntoIter: ExactSizeIterator>,
+    params: impl IntoIterator<Item = impl Into<GenericArg<'tcx>>>,
 ) -> PredicateObligation<'tcx> {
-    let trait_ref = tcx.mk_trait_ref(trait_def_id, self_ty, params);
+    let trait_ref = tcx.mk_trait_ref(trait_def_id, params);
     predicate_for_trait_ref(tcx, cause, param_env, trait_ref, recursion_depth)
 }
 
@@ -304,7 +303,7 @@ pub fn closure_trait_ref_and_return_type<'tcx>(
         TupleArgumentsFlag::Yes => tcx.intern_tup(sig.skip_binder().inputs()),
     };
     debug_assert!(!self_ty.has_escaping_bound_vars());
-    let trait_ref = tcx.mk_trait_ref(fn_trait_def_id, self_ty, [arguments_tuple.into()]);
+    let trait_ref = tcx.mk_trait_ref(fn_trait_def_id, [self_ty, arguments_tuple]);
     sig.map_bound(|sig| (trait_ref, sig.output()))
 }
 
@@ -315,8 +314,7 @@ pub fn generator_trait_ref_and_outputs<'tcx>(
     sig: ty::PolyGenSig<'tcx>,
 ) -> ty::Binder<'tcx, (ty::TraitRef<'tcx>, Ty<'tcx>, Ty<'tcx>)> {
     debug_assert!(!self_ty.has_escaping_bound_vars());
-    let trait_ref =
-        tcx.mk_trait_ref(fn_trait_def_id, self_ty, [sig.skip_binder().resume_ty.into()]);
+    let trait_ref = tcx.mk_trait_ref(fn_trait_def_id, [self_ty, sig.skip_binder().resume_ty]);
     sig.map_bound(|sig| (trait_ref, sig.yield_ty, sig.return_ty))
 }