bug#31654: emacs-lisp-intro.texi - backtrace

[Van L]

> On 31 May 2018, at 02:54, Eli Zaretskii <eliz@gnu.org> wrote:
> 
> But it's what Emacs shows nowadays.  I don't see any good reasons to
> describe in the manual something that is different from the reality
> 
> If you or someone else have ideas how to make this "nicer" without
> lying to the reader, I'm all ears.

The ``ignore'' passage for pre-version 22 suggests a one line backtrace for the 
event of function or variable being ``void’’. Neat.

How about something like a universal argument for level of detail of verbosity? 
for backtrace.

The default is one line where possible for C-x C-e.

The easy to medium setting has lines having a common beautiful prefix where 
possible.

The extremely difficult setting has all the ugly offal outpourings for the 
kitchen sink.