{"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"(PreservesFlags)"}]}
    (PreservesFlags) => { exp!(@sym, preserves_flags, SymPreservesFlags) };
    (Out)            => { exp!(@sym, out,             SymOut) };
    (Pure)           => { exp!(@sym, pure,            SymPure) };