@print{} (-|): Indicating Printed Output
Sometimes an expression will print output during its execution.  You
can indicate the printed output with the @print{} command.
  
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