{"ast_node_type":"other","tokens":[{"end":64,"kind":"keyword","start":0,"text":"(Underscore)"}]}
    (Underscore)     => { exp!(@kw, Underscore, KwUnderscore) };
    (Type)           => { exp!(@kw, Type,       KwType) };
    (Unsafe)         => { exp!(@kw, Unsafe,     KwUnsafe) };