src/HOL/Tools/Sledgehammer/sledgehammer_isar.ML

    ("fact_thresholds", "0.45 0.85"),
    ("max_mono_iters", "smart"),
    ("max_new_mono_instances", "smart"),
    ("isar_proofs", "smart"),
    ("isar_compress", "10"),
-   ("isar_compress_degree", "2"), (* TODO: document *)
    ("isar_try0", "true"), (* TODO: document *)
    ("isar_minimize", "true"), (* TODO: document *)
    ("slice", "true"),
    ("minimize", "smart"),
    ("preplay_timeout", "3")]

     val max_mono_iters = lookup_option lookup_int "max_mono_iters"
     val max_new_mono_instances =
       lookup_option lookup_int "max_new_mono_instances"
     val isar_proofs = lookup_option lookup_bool "isar_proofs"
     val isar_compress = Real.max (1.0, lookup_real "isar_compress")
-    val isar_compress_degree = Int.max (1, lookup_int "isar_compress_degree")
     val isar_try0 = lookup_bool "isar_try0"
     val isar_minimize = lookup_bool "isar_minimize"
     val slice = mode <> Auto_Try andalso lookup_bool "slice"
     val minimize =
       if mode = Auto_Try then NONE else lookup_option lookup_bool "minimize"

      provers = provers, type_enc = type_enc, strict = strict,
      lam_trans = lam_trans, uncurried_aliases = uncurried_aliases,
      learn = learn, fact_filter = fact_filter, max_facts = max_facts,
      fact_thresholds = fact_thresholds, max_mono_iters = max_mono_iters,
      max_new_mono_instances = max_new_mono_instances, isar_proofs = isar_proofs,
-     isar_compress = isar_compress, isar_compress_degree = isar_compress_degree,
-     isar_try0 = isar_try0, isar_minimize = isar_minimize, slice = slice,
-     minimize = minimize, timeout = timeout, preplay_timeout = preplay_timeout,
-     expect = expect}
+     isar_compress = isar_compress, isar_try0 = isar_try0,
+     isar_minimize = isar_minimize, slice = slice, minimize = minimize,
+     timeout = timeout, preplay_timeout = preplay_timeout, expect = expect}
   end
 
 fun get_params mode = extract_params mode o default_raw_params
 fun default_params thy = get_params Normal thy o map (apsnd single)