{"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"println!(\"{argument}\","}]}
    println!("{argument}", argument = "test");   // => "test"
    println!("{1} {} {0} {}", 1, 2);   // => "2 1 1 2"
    println!("{name} {}", 1, name = 2);          // => "2 1"