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"until continue" causes bash to exit.

From: Dan Douglas
Subject: "until continue" causes bash to exit.
Date: Tue, 19 Jul 2016 18:15:21 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1

Hi, I could reproduce this in all bash versions.

bash -c 'set -x; until continue; do :; done; echo test1'; echo test2
+ continue

I'm not actually sure whether this is supposed to work at all. Almost
all shells do something strange when given continue in the first
compound-list. E.g. ksh93 does like bash and exits, and zsh breaks
out of the loop.

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