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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: ! in PS1 in posix mode
Date: Mon, 12 Oct 2015 12:34:13 -0400
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On Mon, Oct 12, 2015 at 09:28:42AM -0700, Linda Walsh wrote:
> Chet Ramey wrote:
> >http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_05_03
> >
> >"The shell shall replace each instance of the character '!' in PS1 with
> >the history file number of the next command to be typed."
> 
> I've never seen that -- even when my prompt has
> ! in it...maybe it's cause I have histexpand 'off'?

Same here.

imadev:~$ PS1=' ! > '
 ! > 

If that's a bug, please don't "fix" it.