keep rules with no premises in Isar proofs from veriT
authorblanchet
Tue, 30 Sep 2014 11:06:26 +0200
changeset 58489 558459615a73
parent 58488 289d1c39968c
child 58490 f6d99c69dae9
keep rules with no premises in Isar proofs from veriT
src/HOL/Tools/SMT/verit_isar.ML
--- a/src/HOL/Tools/SMT/verit_isar.ML	Tue Sep 30 10:25:04 2014 +0200
+++ b/src/HOL/Tools/SMT/verit_isar.ML	Tue Sep 30 11:06:26 2014 +0200
@@ -50,7 +50,7 @@
                   name0 :: normalizing_prems ctxt concl0)]
               end)
           end
-        else if rule = veriT_tmp_ite_elim_rule then
+        else if rule = veriT_tmp_ite_elim_rule orelse null prems then
           [standard_step Lemma]
         else
           [standard_step Plain]