- https://dfockler.github.io/2016/09/15/lalrpop.html
- http://smallcultfollowing.com/babysteps/blog/2015/09/14/lalrpop/?utm_content=buffer39dce&utm_medium=social&utm_source=twitter.com&utm_campaign=buffer
- http://notes.willcrichton.net/parsing-strategies-in-rust
- https://doc.rust-lang.org/regex/regex/index.html