(lispref.info)Marker Type


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Marker Type
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   A "marker" denotes a position in a specific buffer.  Markers
therefore have two components: one for the buffer, and one for the
position.  The position value is changed automatically as necessary as
text is inserted into or deleted from the buffer.  This is to ensure
that the marker always points between the same two characters in the
buffer.

   Markers have no read syntax.  They print in hash notation, giving the
current character position and the name of the buffer.

     (point-marker)
          => #<marker at 10779 in objects.texi>

   Note: Markers, for information on how to test, create, copy, and
move markers.


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