{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"|(arg_index,"}]}
            |(arg_index, local_decl)| DeducedParamAttrs {
        body.local_decls.iter().skip(1).take(body.arg_count).enumerate().map(
                read_only: !deduce_read_only.mutable_args.contains(arg_index)