{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"for"}]}
                for (arg_num, arg_def) in arg_defs.iter().enumerate() {
                    self.tcx.fn_sig(def_id).instantiate_identity().skip_binder().inputs();
                    // For all types reachable from the argument type in the fn sig