{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"println!(\"{a}"}]}
    println!("{a} {c} {b}", a="a", b='b', c=3);  // => "a 3 b"
    println!("{name} {}", 1, name = 2);          // => "2 1"
    println!("{{{}}}", 2);                       // => "{2}"