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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: |
Wed, 18 Mar 2020 20:04:56 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
Noam Postavsky <npostavs@gmail.com> writes:
>>> *** Eval error *** Symbol’s value as variable is void:
>>> debugger-outer-match-data
A simpler reproducer (although it only reproduces once per-session) is
(make-local-variable 'xx)
(let ((xx 1))
(backtrace--locals 1))
In Emacs 26, this gives
Debugger entered--Lisp error: (void-variable xx)
backtrace--locals(1)
(let ((xx 1)) (backtrace--locals 1))
...
eval-defun(nil)
...
The error shouldn't happen, but it's not as severe as in Emacs 27. I
think because in v27, the debugger display code got more fancy, and
recursively triggers the problem.
Since the void-variable is getting triggered from
backtrace_eval_unrewind, I tried the patch below, which almost seems to
fix the problem, but after continuing from the debugger there's a
segfault in GC, so it's definitely not the Right Thing. I think this is
a bit over my head. Ccing Stefan, any ideas?
diff --git i/src/data.c w/src/data.c
index b153068846..5ce5e360ab 100644
--- i/src/data.c
+++ w/src/data.c
@@ -1573,7 +1573,7 @@ notify_variable_watchers (Lisp_Object symbol,
/* Return the default value of SYMBOL, but don't check for voidness.
Return Qunbound if it is void. */
-static Lisp_Object
+Lisp_Object
default_value (Lisp_Object symbol)
{
struct Lisp_Symbol *sym;
diff --git i/src/eval.c w/src/eval.c
index 4559a0e1f6..78a787c4ff 100644
--- i/src/eval.c
+++ w/src/eval.c
@@ -3816,7 +3816,7 @@ backtrace_eval_unrewind (int distance)
{
Lisp_Object sym = specpdl_symbol (tmp);
Lisp_Object old_value = specpdl_old_value (tmp);
- set_specpdl_old_value (tmp, Fdefault_value (sym));
+ set_specpdl_old_value (tmp, default_value (sym));
Fset_default (sym, old_value);
}
break;
@@ -3832,7 +3832,7 @@ backtrace_eval_unrewind (int distance)
if (!NILP (Flocal_variable_p (symbol, where)))
{
set_specpdl_old_value
- (tmp, Fbuffer_local_value (symbol, where));
+ (tmp, buffer_local_value (symbol, where));
set_internal (symbol, old_value, where, SET_INTERNAL_UNBIND);
}
}
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, (continued)
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Michael Heerdegen, 2020/03/17
- bug#40088: 27.0.90; Symbol?s value as variable is void: debugger-outer-match-data, Drew Adams, 2020/03/17
- bug#40088: 27.0.90; Symbol?s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/17
- bug#40088: 27.0.90; Symbol?s value as variable is void: debugger-outer-match-data, Drew Adams, 2020/03/17
- bug#40088: 27.0.90; Symbol?s value as variable is void: debugger-outer-match-data, Michael Heerdegen, 2020/03/18
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Dmitry Gutov, 2020/03/18
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Michael Heerdegen, 2020/03/18
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Dmitry Gutov, 2020/03/18
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Michael Heerdegen, 2020/03/18
bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/17
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data,
Noam Postavsky <=
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Stefan Monnier, 2020/03/18
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/20
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Eli Zaretskii, 2020/03/20
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/21
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Eli Zaretskii, 2020/03/22
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/22
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Eli Zaretskii, 2020/03/22
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/22
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Eli Zaretskii, 2020/03/23
- bug#40088: 27.0.90; Symbol’s value as variable is void: debugger-outer-match-data, Noam Postavsky, 2020/03/23