{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"(SelfUpper)"}]}
    (SelfUpper)      => { exp!(@kw, SelfUpper,  KwSelfUpper) };
    (Safe)           => { exp!(@kw, Safe,       KwSafe) };
    (Static)         => { exp!(@kw, Static,     KwStatic) };