Common Lisp has a reader macro for defining self-referential data structures: https://stackoverflow.com/a/605729 https://stackoverflow.com/a/605729 Maybe it wo

Common Lisp has a reader macro for defining self-referential data structures: https://stackoverflow.com/a/605729 https://stackoverflow.com/a/605729 Maybe it wouldn't be so hard to extend this format to include a notation like that.