{"ast_node_type":"variable","tokens":[{"end":38,"kind":"keyword","start":0,"text":"&&"}]}
                    && let Some(arg) =
                    && let Some(index) = generics.param_def_id_to_index(self.0.tcx, def_id)
                        ty::GenericArgs::identity_for_item(self.0.tcx, self.1).get(index as usize)