{"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"(Macro)"}]}
    (Macro)          => { exp!(@kw, Macro,      KwMacro) };
    (Loop)           => { exp!(@kw, Loop,       KwLoop) };
    (MacroRules)     => { exp!(@kw, MacroRules, KwMacroRules) };