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excess braces ignored: bug or feature ?

From: Mike Frysinger
Subject: excess braces ignored: bug or feature ?
Date: Fri, 17 Feb 2012 14:51:27 -0500
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can't tell if this is a bug or a feature.

FOO= BAR=bar
: ${FOO:=${BAR}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}
echo $FOO

i'd expect an error, or FOO to contain those excess braces.  instead, FOO is 
just "bar".

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