{"ast_node_type":"other","tokens":[{"end":67,"kind":"keyword","start":0,"text":"///"}]}
    /// Allows using `system` as a calling convention with varargs.
    (unstable, extended_varargs_abi_support, "1.65.0", Some(100189)),
    (unstable, extern_system_varargs, "1.86.0", Some(136946)),