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bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-m


From: Noam Postavsky
Subject: bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data
Date: Tue, 17 Mar 2020 07:44:01 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux)

Michael Heerdegen <address@hidden> writes:

> Joost Kremers <address@hidden> writes:
>
>> *** Eval error ***  Symbol’s value as variable is void:
>> debugger-outer-match-data
>
> Another defvar with a missing init value so the variable is not globally
> special?  Or is this case intentional for some reason?

It's something more complicated than that I think.  There are some extra
errors that get raised during the handling of the initial inciting
error, that somehow ends in inhibit-debugger being left set to t.  So
some spec/let-binding is getting snuck out of incorrectly perhaps?

It seems to be ielm specific, but I guess ielm just happens to be doing
something tricky enough to trigger the real bug which lies elsewhere.
As a workaround, you can (setq inhibit-debugger nil) after the first
failure happens.

I can't trigger the debugger-outer-match-data error in Emacs 26, but the
debugger doesn't seem to trigger from ielm at all in that version.





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