(ns ^{:doc "The core Clojure language." :author "Rich Hickey"} clojure.core) (defmacro lazy-cat "Expands to code which yields a lazy sequence of the concatenation of the supplied colls. Each coll expr is not evaluated until it is needed. (lazy-cat xs ys zs) === (concat (lazy-seq xs) (lazy-seq ys) (lazy-seq zs))" {:added "1.0"} [& colls] `(concat ~@(map #(list `lazy-seq %) colls)))
