# 2024-05-12-isa-changelog

This document describes change log with the following modifications:

* Version
* Bytecode instructions

## Version
We update version from 12.0.1.0 to  12.0.2.0

## Bytecode instructions
To support using top-level sendable class in other sendable classes as closure variable, the sendable lexical environment is implemented and the following bytecode instructions are added to create and operate it.
    - callruntime.newsendableenv
    - callruntime.widenewsendableenv
    - callruntime.stsendablevar
    - callruntime.widestsendablevar
    - callruntime.ldsendablevar
    - callruntime.wideldsendablevar