Fix mistake

Author: estebank

compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs

@@ -816,6 +816,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 hir::LangItem::TryTraitFromOutput
                 | hir::LangItem::TryTraitFromResidual
                 | hir::LangItem::TryTraitBranch => ObligationCauseCode::QuestionMark,
+                _ => traits::ItemObligation(def_id),
             },
         );
         (Res::Def(def_kind, def_id), ty)