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6.1.2.14 Examples of for-as-package subclause

 (let ((*package* (make-package "TEST-PACKAGE-1")))
   ;; For effect, intern some symbols
   (read-from-string "(THIS IS A TEST)")
   (export (intern "THIS"))
   (loop for x being each present-symbol of *package*
          do (print x)))
 |>  A 
 |>  TEST 
 |>  THIS
 |>  IS 
⇒  NIL