Feedback for a language written in Rust

Hi for the past 8-10 months i have been working on slatescript a language written in rust, i am looking for feedback on my code as i am new to rust. below is the project link, i wanted to make something of my own for sometime so i decided on creating a programming language i sat down to do this with python at first but then i realized that my language would be slow so i decided to use rust which i did not know about but thought i could give it a try. I wanted to make the language easy to rea...