Re: backtrace sets print-level to 3

[Lars Magne Ingebrigtsen]

Eli Zaretskii <address@hidden> writes:

>> (frame-parameter '(1 (2 (3 (4)))))
>> 
>> Debugger entered--Lisp error: (wrong-number-of-arguments frame-parameter 1)
>>   (frame-parameter (quote (1 ...)))
>>   eval((frame-parameter (quote (1 ...))))
>>   eval-last-sexp-1(nil)
>>   eval-last-sexp(nil)
>>   call-interactively(eval-last-sexp nil nil)
>
> You lost me.  What "levels" do you mean?  I meant the stack levels.

I meant print-level, which says how deep you recurse before you start
printing "...".  I think 3 is way too shallow to actually allow
debugging, as shown by the backtrace above.

> Anyway, it might be relevant that debug.el binds print-level and
> pint-length to fixed numbers, see debugger-setup-buffer.

debug.el binds print-level to 8, which is then overridden by Fbacktrace
to 3, and then set to nil.

I think I'll just fix Fbacktrace to 1) restore the previous value upon
exit instead of setting it to Qnil, and 2) use 8 instead of 3.

-- 
(domestic pets only, the antidote for overdose, milk.)
  address@hidden * Lars Magne Ingebrigtsen