[arcfide]

You may want to check out the Co-dfns compiler, which is proof positive that APL is a terrific language for doing things like tree manipulations, which is the traditional domain of Lisp and functional programming languages like Haskell.

https://github.com/Co-dfns/Co-dfns https://news.ycombinator.com/item?id=13565743 https://news.ycombinator.com/item?id=13638086 https://news.ycombinator.com/item?id=13797797