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-rw-r--r--lego/lego-syntax.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lego/lego-syntax.el b/lego/lego-syntax.el
index 454eeb42..0373a5cb 100644
--- a/lego/lego-syntax.el
+++ b/lego/lego-syntax.el
@@ -35,7 +35,7 @@
(defconst lego-tacticals '("Then" "Else" "Try" "Repeat" "For"))
;; ----- regular expressions for font-lock
-(defconst lego-error-regexp "^\\(Error\\|Lego parser\\)"
+(defconst lego-error-regexp "^\\(cannot assume\\|Error\\|Lego parser\\)"
"A regular expression indicating that the LEGO process has identified an error.")
(defvar lego-id proof-id)