extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;

#[derive(Serialize)]
struct A {
    field1: u8,
    field2: String,
}

fn main() {
    let a = A { field1: 10, field2: "lol".to_string() };
    println!("{:?}", serde_json::to_string(&a).unwrap());
}