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: def.rs
    path of file: ./repos/artichoke/artichoke-backend/src
    
    the code of the file until where you have to start completion: use std::borrow::Cow;
use std::error;
use std::ffi::{c_void, CStr};
use std::fmt;
use std::io::{self, Write as _};
use std::ptr::NonNull;

use spinoso_exception::{NameError, ScriptError};

use crate::class;
use crate::convert::BoxUnboxVmValue;
use crate::core::{ClassRegistry, TryConvertMut};
use crate::error::{Error, RubyException};
use crate::module;
use crate::
    
        fn define_method() {
            let mut interp = interpreter();
            let class = class::Spec::new(
                "DefineMethodTestClass",
                qed::const_cstr_from_str!("DefineMethodTestClass\0"),
                None,
                None,
            )
            .unwrap();
            class::Builder::for_spec(&mut interp, &class)
                .add_method("value", value, sys::mrb_args_none())
                .unwrap()
                .add_self_method("value", value, sys::mrb_args_none())
                .unwrap()
                .define()
                .unwrap();
            interp.def_class::<Class>(class).unwrap();
            let module = module::Spec::new(
                &mut interp,
                "DefineMethodTestModule",
                qed::const_cstr_from_str!("DefineMethodTestModule\0"),
                None,
            )
            .unwrap();
            module::Builder::for_spec(&mut interp, &module)
                .add_method("value", value, sys::mrb_args_none())
                .unwrap()
                .add_self_method("value", value, sys::mrb_args_none())
                .unwrap()
                .define()
                .unwrap();
            interp.def_module::<Module>(module).unwrap();

            interp
                .eval(b"class DynamicTestClass; include DefineMethodTestModule; extend DefineMethodTestModule; end")
                .unwrap();
            interp
                .eval(b"module DynamicTestModule; extend DefineMethodTestModule; end")
                .unwrap();

            let result = interp.eval(b"DefineMethodTestClass.new.value").unwrap();
            let result = result.try_convert_into::<i64>(&interp).unwrap();
            assert_eq!(result, 64);
            let result = interp.eval(b"DefineMethodTestClass.value").unwrap();
            let result = result.try_convert_into::<i64>(&interp).unwrap();
            assert_eq!(result, 8);
            let result = interp.eval(b"DefineMethodTestModule.value").unwrap();
            let result = result.try_convert_into::<i64>(&interp).unwrap();
            assert_eq!(result, 27);
            let result = interp.eval(b"DynamicTestClass.new.value").unwrap();
            let result = result.try_convert_into::<i64>(&interp).unwrap();
            assert_eq!(result, 64);
            let result = interp.eval(b"DynamicTestClass.value").unwrap();
            let result = result.try_convert_into::<i64>(&interp).unwrap();
            assert_eq!(result, 8);
            let result = interp.eval(b"DynamicTestModule.value").unwrap();
            let result = result.try_convert_into::<i64>(&interp).unwrap();
            assert_eq!(result, 27);
        }