{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"(For)"}]}
    (For)            => { exp!(@kw, For,        KwFor) };
    (Fn)             => { exp!(@kw, Fn,         KwFn) };
    (Gen)            => { exp!(@kw, Gen,        KwGen) };