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 `@print{}' (-|): Indicating Printed Output
 ------------------------------------------
 
   Sometimes an expression will print output during its execution.  You
 can indicate the printed output with the `@print{}' command.
 
   The `@print{}' command is displayed as `-|' in Info and similarly, as
 a horizontal dash butting against a vertical bar, in the printed output.
 
   In the following example, the printed text is indicated with `-|',
 and the value of the expression follows on the last line.
 
      (progn (print 'foo) (print 'bar))
           -| foo
           -| bar
           => bar
 
 In a Texinfo source file, this example is written as follows:
 
      @lisp
      (progn (print 'foo) (print 'bar))
           @print{} foo
           @print{} bar
           @result{} bar
      @end lisp
 

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