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bug#24616: 26.0.50; No backtrace when emacsclient --eval fails


From: npostavs
Subject: bug#24616: 26.0.50; No backtrace when emacsclient --eval fails
Date: Sat, 22 Oct 2016 11:35:49 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Eli Zaretskii <address@hidden> writes:
>> >> Just a note: you can get a backtrace by setting debug-on-signal
>> >> instead of debug-on-error.
>> >
>> > Really?
>> >
>> > $ emacsclient --eval '(progn (defun f () (error "foo")) (setq 
>> > debug-on-signal t debug-on-error t) (f))'
>> > *ERROR*: foo
>> >
>> > Am I missing something obvious?
>> 
>> The backtrace shows up in Emacs, where the server is running.
>
> How about adding this to debugging.texi?

Something like this?

diff --git i/doc/lispref/debugging.texi w/doc/lispref/debugging.texi
index c88a2fa..bb3ced4 100644
--- i/doc/lispref/debugging.texi
+++ w/doc/lispref/debugging.texi
@@ -152,6 +152,11 @@ Error Debugging
 must still fulfill the criteria specified by @code{debug-on-error} and
 @code{debug-ignored-errors}.)
 
+For example, setting this variable is useful to get a backtrace from
+code evaluated by emacsclient.  If elisp code evaluated by emacsclient
+signals an error while this variable is address@hidden, the backtrace
+will popup in the running Emacs.
+
 @strong{Warning:} Setting this variable to address@hidden may have
 annoying effects.  Various parts of Emacs catch errors in the normal
 course of affairs, and you may not even realize that errors happen





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