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From: Denys Vlasenko <dvlasenk@redhat.com>
Newsgroups: gnu.bash.bug
Subject: Re: Empty ""s in ARG in ${x:+ARG} expand to no words instead of the empty word if prepended/appended with space
Date: Fri, 20 Jul 2018 16:46:18 +0200
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On 07/20/2018 04:43 PM, Denys Vlasenko wrote:
> $=C2=A0 ${x:+"" }
> ^^^^^^^^^^^ prints nothing, bug?

Should be:
$ f ${x:+"" }

> $ f ${x:+"$e""$e"""}
> ^^^^^^^^^^^ prints nothing, bug?

Should be:
$ f ${x:+"$e""$e" ""}

sorry.