compilation-error-regexp-alist-alist gnu entry for Ruby could maybe be better

[Nikolai Weibull]

Hi!

The part of the gnu entry in compilation-error-regexp-alist-alist that
deals with Ruby backtrace output could perhaps be better.  I would say
that the “in” and “from” lines are information lines, not error lines
and should thus be marked as such.  They are very useful to have, but
I generally don’t want to walk a, sometimes rather deep, backtrace
with next-error.

Thanks!