{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"(Box)"}]}
    (Box)            => { exp!(@kw, Box,        KwBox) };
    (Become)         => { exp!(@kw, Become,     KwBecome) };
    (Break)          => { exp!(@kw, Break,      KwBreak) };