Another commenter recommended rust-analyzer as a source of inspiration. the main author, matklad, has written some very interesting blog posts describing ideas used that might be of interest to you: * https://rust-analyzer.github.io/blog/2020/09/16/challeging-L... * https://rust-analyzer.github.io/blog/2020/10/24/introducing-... * https://rust-analyzer.github.io/blog/2020/09/28/how-to-make-... * https://matklad.github.io/2020/04/13/simple-but-powerful-pra... * https://matklad.github.io/2020/04/15/from-pratt-to-dijkstra....