{"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"//"}]}
    // macros 2.0 expansion, i.e., a macros 1.0 invocation is in a macros 2.0 definition.
    // Otherwise, `expn_id` is a macros 1.0 definition and the call site is in a
    //