It is provided as a Library in www.common-lisp.net.
Essentially it allows for a (let's say it!) Pythonesque, or better, a Dylan-like syntax for variuos definition forms. E.g.
(def var foo 42)(def class panda (animal))
(def struct tree-node content left right)
(def method bar ((x string)) (print x))
(def method bar :after ((x string)) (print "Just printed a string!"))
Full documentation is in the web site.
You may want to check out cl-def which is the result of the NIH syndrome (or just a different implementation which is more flexible).
This page is linked from: cl-def
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