{"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"(\"{expr:?}\","}]}
            ("{expr:?}", expect![["{expr:?}"]]),
            ("{expr} is {2 + 2}", expect![["{expr} is {}; 2 + 2"]]),
            ("{expr:1$}", expect![[r"{expr:1$}"]]),