shithub: trueawk

ref: 7d562f0dff4db4ea7f7e91f462c4adf552b1b410
dir: /testdir/t.delete3/

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{ x[$1] = $1
  delete x[$1]
  n = 0
  for (i in x) n++
  if (n != 0)
	print "error", n, "at", NR
}