fn main() {
    println!("{:?}", {
        format!("{:f}", 10)
    });
}


/* ~~~~=== stderr ===~~~~
   Compiling playground v0.0.1 (file:///playground)
error: unknown format trait `f`
 --> src/main.rs:5:25
  |
5 |         format!("{:f}", 10)
  |                         ^^

error: aborting due to previous error

error: Could not compile `playground`.

To learn more, run the command again with --verbose.

*/

/* ~~~~=== stdout ===~~~~

*/