{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"(Become)"}]}
    (Become)         => { exp!(@kw, Become,     KwBecome) };
    (Await)          => { exp!(@kw, Await,      KwAwait) };
    (Box)            => { exp!(@kw, Box,        KwBox) };