{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"(Out)"}]}
    (Out)            => { exp!(@sym, out,             SymOut) };
    (Options)        => { exp!(@sym, options,         SymOptions) };
    (PreservesFlags) => { exp!(@sym, preserves_flags, SymPreservesFlags) };