(lispref.info)Printing Notation

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Printing Notation

   Many of the examples in this manual print text when they are
evaluated.  If you execute the code from an example in a Lisp
Interaction buffer (such as the buffer `*scratch*'), the printed text
is inserted into the buffer.  If the example is executed by other means
(such as by evaluating the function `eval-region'), the text printed is
usually displayed in the echo area.  You should be aware that text
displayed in the echo area is truncated to a single line.

   In examples that print text, the printed text is indicated with
`-|', irrespective of how the form is executed.  The value returned by
evaluating the form (here `bar') follows on a separate line.

     (progn (print 'foo) (print 'bar))
          -| foo
          -| bar
          => bar

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