src/HOL/Tools/Sledgehammer/sledgehammer_atp_systems.ML

    prem_role = Conjecture,
    generate_isabelle_info = false,
    good_slices =
      let
        val (format, type_enc, lam_trans, extra_options) =
-         if string_ord (getenv "E_VERSION", "2.7") <> LESS then
-           (* '$ite' support appears to be buggy *)
+         if string_ord (getenv "E_VERSION", "3.0") <> LESS then
+           (* '$ite' support appears to be unsound. *)
            (THF (Monomorphic, {with_ite = false, with_let = false}, THF_Without_Choice), "mono_native_higher", keep_lamsN, "--auto-schedule=4 --serialize-schedule=true --demod-under-lambda=true")
          else if string_ord (getenv "E_VERSION", "2.6") <> LESS then
            (THF (Monomorphic, {with_ite = false, with_let = false}, THF_Without_Choice), "mono_native_higher", keep_lamsN, "--auto-schedule")
          else
            (THF (Monomorphic, {with_ite = false, with_let = false}, THF_Lambda_Free), "mono_native_higher", combsN, "--auto-schedule")