eintr: What the Kill Ring Does

 
 What the Kill Ring Does
 =======================
 
 The kill ring has a default maximum length of sixty items; this number
 is too large for an explanation.  Instead, set it to four.  Please
 evaluate the following:
 
      (setq old-kill-ring-max kill-ring-max)
      (setq kill-ring-max 4)
 
 Then, please copy each line of the following indented example into the
 kill ring.  You may kill each line with ‘C-k’ or mark it and copy it
 with ‘M-w’.
 
 (In a read-only buffer, such as the ‘*info*’ buffer, the kill command,
 ‘C-k’ (‘kill-line’), will not remove the text, merely copy it to the
 kill ring.  However, your machine may beep at you.  Alternatively, for
 silence, you may copy the region of each line with the ‘M-w’
 (‘kill-ring-save’) command.  You must mark each line for this command to
 succeed, but it does not matter at which end you put point or mark.)
 
 Please invoke the calls in order, so that five elements attempt to fill
 the kill ring:
 
      first some text
      second piece of text
      third line
      fourth line of text
      fifth bit of text
 
 Then find the value of ‘kill-ring’ by evaluating
 
      kill-ring
 
 It is:
 
      ("fifth bit of text" "fourth line of text"
      "third line" "second piece of text")
 
 The first element, ‘first some text’, was dropped.
 
    To return to the old value for the length of the kill ring, evaluate:
 
      (setq kill-ring-max old-kill-ring-max)