Task

Write a function to flatten the nesting in an arbitrary list of values.

Your program should work on the equivalent of this list:

  [[1], 2, [[3, 4], 5], [[[]]], [[[6]]], 7, 8, []]

Where the correct result would be the list:

   [1, 2, 3, 4, 5, 6, 7, 8]

Related task

   Tree traversal


(
  =a
  (a 'quotation? any?)
  (a => #a) while a
) :deep-flatten
 
((1) 2 ((3 4) 5) ((())) (((6))) 7 8 ()) deep-flatten puts!