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(setq m (make-marker)) ⇒ #<marker in no buffer>
(marker-position m) ⇒ nil
(marker-buffer m) ⇒ nil
(set-marker m 3770 (current-buffer)) ⇒ #<marker at 3770 in markers.texi>
(marker-buffer m) ⇒ #<buffer markers.texi>
(marker-position m) ⇒ 3770