src/HOL/Library/refute.ML

--- a/src/HOL/Library/refute.ML	Thu Apr 16 13:48:10 2015 +0200
+++ b/src/HOL/Library/refute.ML	Thu Apr 16 14:18:32 2015 +0200
@@ -2969,7 +2969,6 @@
     "try to find a model that refutes a given subgoal"
     (scan_parms -- Scan.optional Parse.nat 1 >>
       (fn (parms, i) =>
-        Toplevel.unknown_proof o
         Toplevel.keep (fn state =>
           let
             val ctxt = Toplevel.context_of state;