Macro
Takes a body of expressions and yields a Delay object that will invoke the body only the first time it is forced (with force), and will cache the result and return it on all subsequent force calls.
; clojure/core.clj:434 (defmacro delay [& body] (list 'new 'clojure.lang.Delay (list* `#^{:once true} fn* [] body)))
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