Several times now, I've found it useful to have structures defined with similar keys -- not necessarily for any particular OO or type system, just similar datasets. I wasn't sure if something like this already existed, but.. (defmacro defstruct-extend "Defines a new structure with all the keys of the existing structure" [name parent & newkeys] `(def ~name (apply create-struct (into (keys (struct ~parent)) '~newkeys))))
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