src/HOL/Tools/Sledgehammer/sledgehammer_prover_minimize.ML

--- a/src/HOL/Tools/Sledgehammer/sledgehammer_prover_minimize.ML	Tue Sep 30 14:01:33 2014 +0200
+++ b/src/HOL/Tools/Sledgehammer/sledgehammer_prover_minimize.ML	Tue Sep 30 14:18:07 2014 +0200
@@ -228,7 +228,7 @@
     ({state, goal, subgoal, subgoal_count, ...} : prover_problem)
     (result as {outcome, used_facts, used_from, preferred_methss, run_time, message}
      : prover_result) =
-  if is_some outcome orelse null used_facts then
+  if is_some outcome then
     result
   else
     let