Remove some more useless ty::Binder::dummy calls

Author: WaffleLapkin

compiler/rustc_hir_typeck/src/coercion.rs

@@ -764,11 +764,11 @@ impl<'f, 'tcx> Coerce<'f, 'tcx> {
             self.tcx,
             self.cause.clone(),
             self.param_env,
-            ty::Binder::dummy(ty::TraitRef::from_lang_item(
+            ty::TraitRef::from_lang_item(
                 self.tcx.at(self.cause.span),
                 hir::LangItem::PointerLike,
                 [a],
-            )),
+            ),
         ));
 
         Ok(InferOk {

compiler/rustc_trait_selection/src/solve/project_goals.rs

@@ -334,11 +334,11 @@ impl<'tcx> assembly::GoalKind<'tcx> for ProjectionPredicate<'tcx> {
 
                 ty::Alias(_, _) | ty::Param(_) | ty::Placeholder(..) => {
                     // FIXME(ptr_metadata): It would also be possible to return a `Ok(Ambig)` with no constraints.
-                    let sized_predicate = ty::Binder::dummy(ty::TraitRef::from_lang_item(
+                    let sized_predicate = ty::TraitRef::from_lang_item(
                         tcx.at(DUMMY_SP),
                         LangItem::Sized,
                         [ty::GenericArg::from(goal.predicate.self_ty())],
-                    ));
+                    );
                     ecx.add_goal(goal.with(tcx, sized_predicate));
                     tcx.types.unit
                 }

compiler/rustc_trait_selection/src/traits/select/confirmation.rs

@@ -646,11 +646,8 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
             output_ty,
             &mut nested,
         );
-        let tr = ty::Binder::dummy(ty::TraitRef::from_lang_item(
-            self.tcx().at(cause.span),
-            LangItem::Sized,
-            [output_ty],
-        ));
+        let tr =
+            ty::TraitRef::from_lang_item(self.tcx().at(cause.span), LangItem::Sized, [output_ty]);
         nested.push(Obligation::new(self.infcx.tcx, cause, obligation.param_env, tr));
 
         Ok(ImplSourceFnPointerData { fn_ty: self_ty, nested })