{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"ty::InstanceKind::FutureDropPollShim(_def_id,"}]}
                        ty::InstanceKind::FutureDropPollShim(_def_id, proxy_ty, impl_ty) => {
                        }
                            self.visit_ty($(& $mutability)? *proxy_ty, TyContext::Location(location));