Add tcx lifetime to Binder

compiler/rustc_infer/src/traits/mod.rs

@@ -128,7 +128,7 @@ impl<'tcx> FulfillmentError<'tcx> {
 }
 
 impl<'tcx> TraitObligation<'tcx> {
-    pub fn self_ty(&self) -> ty::Binder<Ty<'tcx>> {
+    pub fn self_ty(&self) -> ty::Binder<'tcx, Ty<'tcx>> {
         self.predicate.map_bound(|p| p.self_ty())
     }
 }