在Rust中使用Serde从json中提升嵌套值可能是可选的

use serde::{Deserialize, Serialize};
use serde_json;

#[derive(Debug, Deserialize)]
struct Person {
    name: String,
    age: u32,
    address: Address,
}

#[derive(Debug, Deserialize)]
struct Address {
    street: String,
    city: String,
}

fn main() {
    let json_str = r#"
        {
            "name": "John Doe",
            "age": 30,
            "address": {
                "street": "123 Main St",
                "city": "New York"
            }
        }
    "#;

    let person: Person = serde_json::from_str(json_str).unwrap();

    println!("{:?}", person);
    println!("Name: {}", person.name);
    println!("Age: {}", person.age);
    println!("Address: {}, {}", person.address.street, person.address.city);
}