{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"self.tcx.type_of(item).instantiate_identity().fn_sig(self.tcx).c_variadic();"}]}
                        self.tcx.type_of(item).instantiate_identity().fn_sig(self.tcx).c_variadic();
                    let c_variadic =