The rectangle selected region question is replaced with " symbol's function definition is void : t " error

[Budi]

The rectangle selected region question is replaced with " symbol's
function definition is void : t " error problem as calling a function

the copy into clipboard function is meant to save to kill-ring with or
without a selected region, if it exist then save that region otherwise
make up a full line region and save that
but got symbol's function definition is void : t  error above


(defun copy (b e)
  (interactive "r")
  (if (use-region-p) (call-interactively 'kill-ring-save)
  (beginning-of-line)
  (push-mark (line-end-position))
  (activate-mark)
  (call-interactively 'kill-ring-save)
  (deactivate-mark)
  (pop-mark)))
(global-set-key (kbd "C-c") 'copy)

invaluable thanks to anyone help me out.