{"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"///"}]}
    ///    which will have been resolved to a `def_id`
    /// 2. The path in question is the path to the trait `std::ops::Index`,
    /// 3. The `generic_args` contains info on the `<...>` contents. The `usize` type