The project home page is at http://common-lisp.net/project/patty
ASDF-install package (obsolete) http://common-lisp.net/project/patty/patty_1.0.6.tar.gz
patty
Patty is a library that facilitates working with functional data structures on top of CLOS. It consists of a few macros and metaclasses that integrate nicely with CLOS. Code using patty is similar in style to Haskell code using algebraic data types, primitive pattern matching and type classes.