https://rustc-dev-guide.rust-lang.org/syntax-intro.html

https://tech.loveholidays.com/building-a-compiler-with-rust-and-llvm-07068faf6acc

https://insatiable-curiousity.gitbook.io/building-a-compiler-with-llvm-and-rust-a-tutorial/part-3-advanced-topics-conclusion-and-next-steps-chapter-23/chapter-23