Macro
Takes a body of expressions that returns an ISeq or nil, and yields a Seqable object that will invoke the body only the first time seq is called, and will cache the result and return it on all subsequent seq calls.
; clojure/core.clj:403 (defmacro lazy-seq [& body] (list 'new 'clojure.lang.LazySeq (list* '#^{:once true} fn* [] body)))
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