diff -r 9f33b4ec866c -r ff3d49e77359 src/HOL/Tools/Sledgehammer/sledgehammer_run.ML --- a/src/HOL/Tools/Sledgehammer/sledgehammer_run.ML Wed Jun 08 16:20:18 2011 +0200 +++ b/src/HOL/Tools/Sledgehammer/sledgehammer_run.ML Wed Jun 08 16:20:18 2011 +0200 @@ -77,7 +77,7 @@ ({state, subgoal, subgoal_count, facts, ...} : prover_problem) (result as {outcome, used_facts, run_time_in_msecs, preplay, message, message_tail} : prover_result) = - if is_some outcome then + if is_some outcome orelse null used_facts then result else let