Re: ${| command; } funsub not setting REPLY does not error out with 'set -u' active

[microsuxxor]

https://lists.gnu.org/archive/html/help-bash/2022-08/msg00021.html

On Wed, Dec 25, 2024, 2:37 PM Zachary Santer <zsanter@gmail.com> wrote:

> On Tue, Dec 24, 2024 at 7:51 PM Lawrence Velázquez <vq@larryv.me> wrote:
> >
> > On Tue, Dec 24, 2024, at 12:10 PM, Zachary Santer wrote:
> > > Some other nonsense real quick:
> > >
> > > zsant@Zack2021HPPavilion MSYS ~/repos/bash
> > > $ : ${|  REPYL="whatever"}
> > > ; }
> > > bash: syntax error near unexpected token `;' while looking for
> matching `}'
> > > bash: DEBUG warning: current_token (10) != shell_eof_token (})
> > > bash: syntax error
> >
> > What do you expect to happen here?
>
> I was thinking that maybe this had left the parser in an invalid
> state. I'm not used to seeing "DEBUG warning" ever, but maybe that's
> just enabled for non-release versions of bash?
>
> > > zsant@Zack2021HPPavilion MSYS ~/repos/bash
> > > $ : ${|  REPYL="whatever"; }
> > > bash:  : command not found
> > >
> > > zsant@Zack2021HPPavilion MSYS ~/repos/bash
> > > $ : ${| REPYL="whatever"; }
> > > bash:  REPYL=whatever: command not found
> > >
> > > zsant@Zack2021HPPavilion MSYS ~/repos/bash
> > > $ : ${| REPYL="whatever"; }
> > > bash:  REPYL=whatever: command not found
> >
> > The second and third examples above look exactly the same.  Are
> > they supposed to differ somehow?
>
> They are the same. I just copied what I had in the terminal verbatim.
>
> > Anyway, I'm not seeing these errors.  Judging from the messages,
> > I'd guess that you accidentally introduced a nonblank whitespace
> > character immediately after '${|'.
> >
> >         bash-5.3$ : ${| REPYL="whatever"; }
> >         bash-5.3$ LC_ALL=en_US.UTF-8
> >         bash-5.3$ nbsp=$'\uA0'
> >         bash-5.3$ eval ': ${|'"$nbsp"' REPYL="whatever"; }'
> >         bash:  : command not found
> >         bash-5.3$ eval ': ${|'"$nbsp"'REPYL="whatever"; }'
> >         bash:  REPYL=whatever: command not found
>
> You're right. That's exactly what happened. I'd started with something
> I copied from the email I was writing. I've already seen that gmail
> will intersperse non-breaking spaces among a run of multiple spaces, I
> guess so HTML will still display it in a way that looks right.
>
> > > zsant@Zack2021HPPavilion MSYS ~/repos/bash
> > > $ : ${|
> > >  REPYL="whatever"
> > > }
> > >
> > > The first thing within a ${| command; } funsub has to be a command if
> > > it's on the same line as ${| ?
> >
> > No.
>
> Sorry for the noise.
>