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Task/Anonymous-recursion/UTFool/anonymous-recursion.utfool

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+···
+http://rosettacode.org/wiki/Anonymous_recursion
+···
+⟦import java.util.function.UnaryOperator;⟧
+
+■ AnonymousRecursion
+  § static
+    ▶ main
+    • args⦂ String[]
+      if 0 > Integer.valueOf args[0]
+         System.out.println "negative argument"
+      else
+         System.out.println *UnaryOperator⟨Integer⟩° ■
+           ▶ apply⦂ Integer
+           • n⦂ Integer
+             ⏎ n ≤ 1 ? n ! (apply n - 1) + (apply n - 2)
+         °.apply Integer.valueOf args[0]