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bug#9259: extra line in "unless" docstring?

From: jidanni
Subject: bug#9259: extra line in "unless" docstring?
Date: Mon, 08 Aug 2011 11:13:06 +0800

unless is a Lisp macro in `subr.el'.

(unless COND BODY...)

If COND yields nil, do BODY, else return nil. <--------what is this line doing 
When COND yields nil, eval BODY forms sequentially and return
value of last one, or nil if there are none.

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