bug#51463: Lack of error message in several guix subcommands

[Ludovic Courtès]

Hi Alice,

Alice BRENON <alice.brenon@ens-lyon.fr> skribis:

> I was giving guix shell a try today and noticed this annoying lack of
> relevant feedback from the tool: when running on a particularly
> malformed guix.scm, either by auto-loading or by explicitely passing -f
> guix.scm, guix shell returned in error ($? == 1) without printing any
> error message, which is a bit unhelpful.

I believe commit 4d59596a1c5f6b20870e619cbf67068ac7dd64ff fixes it (the
issue affected ‘read-error’ exceptions for reasons other than missing
closing parentheses).

Let me know if anything’s amiss.

Thanks!

Ludo’.