#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::fmt;
struct Bar {
    bar: i32,
    another: String,
}
impl fmt::Debug for Bar {
    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt.debug_struct("Bar")
            .field("bar", &self.bar)
            .field("another", &self.another)
            .field("nonexistent_field", &1)
            .finish()
    }
}
fn main() {
    assert_eq!(
        format!("{:?}", Bar { bar : 10, another : "Hello World".to_string() }),
        r#"Bar { bar: 10, another: "Hello World", nonexistent_field: 1 }"#,
    );
}