just-engine 0.1.0

A ground-up ES6 JavaScript engine with tree-walking interpreter, bytecode VMs, and Cranelift JIT compiler
Documentation 
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use crate::runner::ds::env_record::EnvironmentRecordType;
use std::cell::RefCell;
use std::rc::Rc;

pub type JsLexEnvironmentType = Rc<RefCell<LexEnvironment>>;

pub struct LexEnvironment {
    pub inner: Box<EnvironmentRecordType>,
    pub outer: Option<JsLexEnvironmentType>,
}