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

use std::collections::HashMap;
use serde_json::Value;

const JASON: &str = r#"
{
    "add0" : {
        "callcreates" : []

    },
    "add1" : {
        "callcreates" : []
    }
}"#;

#[derive(Debug, Deserialize)]
pub struct OpCode {
    callcreates: Vec<u32>,
}

fn main() {
    let op_codes: HashMap<String, OpCode> = serde_json::from_str(JASON).unwrap();
    println!("{:?}", op_codes);
}