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From: A Soare <alinsoar@voila.fr>
Newsgroups: gmane.emacs.devel
Subject: lisp-indent-line
Date: Mon, 12 Mar 2007 11:27:14 +0100 (CET)
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(defun new-lisp-indent-line (&optional whole-exp)
  "Indent current line as Lisp code.
With argument, indent any additional lines of the same expression
rigidly along with this one."
  (interactive "P")
  ...)

And also when I call it using C-u <parameter> TAB the effect is the same as the simple TAB.

So what it shoud have been useful for?

a soare.