For folks who are curious, it is possible to use Fennel w/ the Lua in Lualatex: https://wiki.fennel-lang.org/Fennel-in-LuaTeX https://wiki.fennel-lang.org/Fenn

For folks who are curious, it is possible to use Fennel w/ the Lua in Lualatex: https://wiki.fennel-lang.org/Fennel-in-LuaTeX https://wiki.fennel-lang.org/Fennel-in-LuaTeX but no activity for this on tex.stackexchange (yet?) --- given the difficulties in doing recursion (see: https://tex.stackexchange.com/questions/723897/breaking-out-of-recursion-in-latex-macro-using-lua https://tex.stackexchange.com/questions/723897/breaking-out-... ) using something like to Lisp could potentially be very helpful.