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Variable undefines - bug or feature?

From: Denis Melnikov
Subject: Variable undefines - bug or feature?
Date: Mon, 23 Jan 2012 23:58:21 +0400 
Hi,
after the following fragment of code named variable gets empty:

ls | while read file ; do
  v=1
  break
done
echo $v

Is it a bug or a feature?
GNU bash, version 4.1.2(1)-release

Denis
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