Stefan Monnier writes:

>> +* Guile backtraces
>
> Please add the Guile version here (ideally, the latest version known to
> generate such backtraces).

Done, latest is 2.0.11

>> +    (guile-file "^In \\(.+\\):\n" 1)
>
> AFAICT this will mark those lines as errors (aka red) whereas I think
> these should be marked as supplemental info (aka green).

Yes, I have raised this question for the new backtrace format.  

I do not care too much which we choose, however the usual case is that
there is only one backtrace and having them red makes stepping with
next-error,previous-error easier for me.

> Other than that, it looks OK, so if someone wants to install it,
> go ahead.

Thanks, updated version attached.
Greetings, Jan