{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"(Async)"}]}
    (Async)          => { exp!(@kw, Async,      KwAsync) };
    (As)             => { exp!(@kw, As,         KwAs) };
    (Auto)           => { exp!(@kw, Auto,       KwAuto) };