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-rw-r--r--generic/proof-config.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/proof-config.el b/generic/proof-config.el
index 3ca47c76..1107358c 100644
--- a/generic/proof-config.el
+++ b/generic/proof-config.el
@@ -1434,7 +1434,7 @@ Leave unset if no special characters are being used."
:type '(choice character (const nil))
:group 'proof-shell)
-(defcustom proof-shell-annotated-prompt-regexp ""
+(defcustom proof-shell-annotated-prompt-regexp nil
"Regexp matching a (possibly annotated) prompt pattern.
Output is grabbed between pairs of lines matching this regexp.
To help matching you may be able to annotate the proof assistant