src/HOL/BNF/Tools/bnf_fp_sugar_tactics.ML

 fun mk_inject_tac ctxt ctr_def ctor_inject =
   unfold_thms_tac ctxt [ctr_def] THEN rtac (ctor_inject RS ssubst) 1 THEN
   unfold_thms_tac ctxt @{thms sum.inject Pair_eq conj_assoc} THEN rtac refl 1;
 
 val rec_like_unfold_thms =
-  @{thms case_unit comp_def convol_def id_apply map_pair_def sum.simps(5,6) sum_map.simps
-      split_conv};
+  @{thms comp_def convol_def id_apply map_pair_def prod_case_Pair_iden sum.simps(5,6) sum_map.simps
+      split_conv unit_case_Unity};
 
 fun mk_rec_like_tac pre_map_defs map_ids rec_like_defs ctor_rec_like ctr_def ctxt =
   unfold_thms_tac ctxt (ctr_def :: ctor_rec_like :: rec_like_defs @ pre_map_defs @ map_ids @
     rec_like_unfold_thms) THEN unfold_thms_tac ctxt @{thms id_def} THEN rtac refl 1;