{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
        let path_debug = cx.path_global(span, cx.std_path(&[sym::fmt, sym::Debug]));
        // `let values: &[&dyn Debug] = &[&&self.field1, &&self.field2];`
        let ty_dyn_debug = cx.ty(