ex3.rs

extern crate rustc_serialize;
use rustc_serialize::json::{self, ToJson, Json};
use std::collections::HashMap;


#[no_mangle]
pub extern fn read_json(ro: &'static str) -> String {
    let roo = ro.to_string();
    let json_for_rust: HashMap<String, i32> = json::decode(&roo).unwrap();
    let encoded = json::encode(&json_for_rust).unwrap();
    encoded
}

#[test]
fn it_reads_the_json() {
    let string = "{\"wow\":\"6\"}";
    let ro = string;
    assert_eq!("{\"wow\":6}", read_object(ro));
}