You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: scripting.rs
    path of file: ./repos/handlebars-rust/src/helpers
    
    the code of the file until where you have to start completion: use std::collections::{BTreeMap, HashMap};

use crate::context::Context;
use crate::error::{RenderError, RenderErrorReason};
use crate::helpers::HelperDef;
use crate::json::value::{PathAndJson, ScopedJson};
use crate::registry::Registry;
use crate::render::{Helper, RenderContext};

use rhai::serde::{from_dynamic, to_dynamic};
use rhai::{Dynamic, Engine, Scope, AST};

use serde_json::value::Value as Json;

pub(crate) struct ScriptHelper {
    pub(crate) sc
    
    fn test_script_helper_value_access() {
        let engine = Engine::new();

        let script = "let plen = len(params); let p0 = params[0]; let hlen = len(hash); let hme = hash[\"me\"]; plen + \",\" + p0 + \",\" + hlen + \",\" + hme";
        let ast = engine.compile(&script).unwrap();

        let params = vec![PathAndJson::new(None, ScopedJson::Derived(json!(true)))];

        let mut hash = BTreeMap::new();
        hash.insert(
            "me",
            PathAndJson::new(None, ScopedJson::Derived(json!("no"))),
        );
        hash.insert(
            "you",
            PathAndJson::new(None, ScopedJson::Derived(json!("yes"))),
        );

        let result = call_script_helper(&params, &hash, &engine, &ast)
            .unwrap()
            .render();
        assert_eq!("1,true,2,no", &result);
    }