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From: Grisha Levit <grishalevit@gmail.com>
Newsgroups: gnu.bash.bug
Subject: Re: temp env allows variables that look like array subscripts
Date: Sat, 8 Dec 2018 23:45:01 -0500
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Xref: csiph.com gnu.bash.bug:14898

FWIW, namerefs in the temporary environment bypass the implemented checks:

    $ declare -n ref=var[0]
    $ ref=X printenv 'var[0]'
    X