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From: Isabella Bosia <izaberina@gmail.com>
Newsgroups: gnu.bash.bug
Subject: x[
Date: Mon, 29 Jul 2019 17:55:58 +0100
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Xref: csiph.com gnu.bash.bug:15260

haven't really looked into why this happens but x[ seems to trigger some
funny parser behavior

x[ newline     should not prompt with PS2

it can't be defined as a normal sh function, but it can be defined with the
function keyword

it can't be called like a normal function, but things like "x[" or \x[ work

this bug seems old