From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marcin Borkowski <mbork@mbork.pl>
Subject: Is this (error (error ...)) form intentional?
Date: Sat, 19 Mar 2016 11:28:12 +0100
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>From org.el:

--8<---------------cut here---------------start------------->8---
(defun org-back-to-heading (&optional invisible-ok)
  "Call `outline-back-to-heading', but provide a better error message."
  (condition-case nil
      (outline-back-to-heading invisible-ok)
    (error (error "Before first headline at position %d in buffer %s"
		  (point) (current-buffer)))))
--8<---------------cut here---------------end--------------->8---

Frankly, I don't see the point of nesting `error'.

Best,

-- 
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University