{"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"//"}]}
        // is expanded, and it doesn't give an error.
        // `TyCtxt::check_mod_attrs`), but by the time that runs the macro
        validate_attr::emit_fatal_malformed_builtin_attribute(&sess.psess, first_path, sym::path);