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-rw-r--r--src/eval.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/src/eval.c b/src/eval.c
index 33b82f74b6..d182f7f693 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -300,6 +300,11 @@ call_debugger (Lisp_Object arg)
specbind (Qinhibit_redisplay, Qnil);
specbind (Qinhibit_debugger, Qt);
+ /* If we are debugging an error while `inhibit-changing-match-data'
+ is bound to non-nil (e.g., within a call to `string-match-p'),
+ then make sure debugger code can still use match data. */
+ specbind (Qinhibit_changing_match_data, Qnil);
+
#if 0 /* Binding this prevents execution of Lisp code during
redisplay, which necessarily leads to display problems. */
specbind (Qinhibit_eval_during_redisplay, Qt);