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The following examples illustrate some of the many ways in which the implementation-dependent nature of the modification can manifest itself.
(let ((a (list 2 1 4 3 7 6 'five))) (ignore-errors (sort a #'<)) a) ⇒ (1 2 3 4 6 7 FIVE) OR⇒ (2 1 4 3 7 6 FIVE) OR⇒ (2) (prog foo ((a (list 1 2 3 4 5 6 7 8 9 10))) (sort a #'(lambda (x y) (if (zerop (random 5)) (return-from foo a) (> x y))))) ⇒ (1 2 3 4 5 6 7 8 9 10) OR⇒ (3 4 5 6 2 7 8 9 10 1) OR⇒ (1 2 4 3)