Little hack to display default values in the doc. (don't forget to `cargo test --doc`)

Aaa.rs

#[derive(Debug, PartialEq, Eq)]
pub struct Aaa {
    pub field1: usize,
    pub field2: i32,
}

impl Default for Aaa {
	/// ```
	/// # use aaa::Aaa;
	/// # let a =
	/// Aaa {
	/// 	field1: 3,
	/// 	field2: 5,
	/// }
	/// # ;
	/// # assert_eq!(a, Aaa::default());
	/// ```
	fn default() -> Self {
		Self {
			field1: 3,
			field2: 5,
		}
	}
}