bug#52347: Shell: error when -m manifest is removed

[Liliana Marie Prikler]

Hi,

I am experiencing a similar situation without the container.  At work,
I need some special Emacs packages, that I don't need/want in my normal
setup, so I do `guix shell -m manifest.scm -- emacs'.  Even with the
directory added to the good noodles list, `guix shell -- emacs' fails,
probably because Guix assumes it has arguments when those really are
just the command to run.  IOW the check for "when is implicit okay"
might be too narrow for this use case.

Cheers