--- a/src/HOL/BNF/Tools/bnf_fp_rec_sugar_tactics.ML Thu Sep 26 16:25:12 2013 +0200
+++ b/src/HOL/BNF/Tools/bnf_fp_rec_sugar_tactics.ML Thu Sep 26 16:41:32 2013 +0200
@@ -40,7 +40,7 @@
fun mk_primcorec_assumption_tac ctxt discIs =
HEADGOAL (SELECT_GOAL (unfold_thms_tac ctxt
@{thms not_not not_False_eq_True de_Morgan_conj de_Morgan_disj} THEN
- SOLVE (HEADGOAL (REPEAT o (rtac refl ORELSE' atac ORELSE'
+ SOLVE (HEADGOAL (REPEAT o (rtac refl ORELSE' atac ORELSE' etac conjE ORELSE'
resolve_tac @{thms TrueI conjI disjI1 disjI2} ORELSE'
dresolve_tac discIs THEN' atac)))));