src/HOL/Tools/atp_manager.ML
author immler@in.tum.de
Mon Jun 22 17:07:09 2009 +0200 (2009-06-22)
changeset 31752 19a5f1c8a844
parent 31409 d8537ba165b5
child 31791 c9a1caf218c8
permissions -rw-r--r--
use results of relevance-filter to determine additional clauses;
(needed for minimize to be able to prove the same problems as sledgehammer)
wenzelm@28477
     1
(*  Title:      HOL/Tools/atp_manager.ML
wenzelm@28477
     2
    Author:     Fabian Immler, TU Muenchen
wenzelm@28477
     3
wenzelm@28571
     4
ATP threads are registered here.
wenzelm@28571
     5
Threads with the same birth-time are seen as one group.
wenzelm@28571
     6
All threads of a group are killed when one thread of it has been successful,
wenzelm@28571
     7
or after a certain time,
wenzelm@28571
     8
or when the maximum number of threads exceeds; then the oldest thread is killed.
wenzelm@28477
     9
*)
wenzelm@28477
    10
wenzelm@28477
    11
signature ATP_MANAGER =
wenzelm@28477
    12
sig
wenzelm@28586
    13
  val get_atps: unit -> string
wenzelm@28477
    14
  val set_atps: string -> unit
wenzelm@28586
    15
  val get_max_atps: unit -> int
wenzelm@28586
    16
  val set_max_atps: int -> unit
wenzelm@28586
    17
  val get_timeout: unit -> int
wenzelm@28477
    18
  val set_timeout: int -> unit
wenzelm@28586
    19
  val kill: unit -> unit
wenzelm@28586
    20
  val info: unit -> unit
wenzelm@29112
    21
  val messages: int option -> unit
immler@31409
    22
  type prover = int -> (thm * (string * int)) list option ->
immler@31752
    23
    (thm * (string * int)) list option -> string -> int ->
immler@31409
    24
    Proof.context * (thm list * thm) ->
immler@31752
    25
    bool * string * string * string vector * (thm * (string * int)) list
wenzelm@28595
    26
  val add_prover: string -> prover -> theory -> theory
wenzelm@28484
    27
  val print_provers: theory -> unit
immler@31037
    28
  val get_prover: string -> theory -> prover option
wenzelm@28571
    29
  val sledgehammer: string list -> Proof.state -> unit
wenzelm@28477
    30
end;
wenzelm@28477
    31
wenzelm@28586
    32
structure AtpManager: ATP_MANAGER =
wenzelm@28477
    33
struct
wenzelm@28477
    34
wenzelm@28586
    35
(** preferences **)
wenzelm@28586
    36
wenzelm@29112
    37
val message_store_limit = 20;
wenzelm@29112
    38
val message_display_limit = 5;
wenzelm@29112
    39
wenzelm@28586
    40
local
wenzelm@28586
    41
immler@29598
    42
val atps = ref "e remote_vampire";
wenzelm@28586
    43
val max_atps = ref 5;   (* ~1 means infinite number of atps *)
immler@29784
    44
val timeout = ref 60;
wenzelm@28586
    45
wenzelm@28586
    46
in
wenzelm@28586
    47
wenzelm@28586
    48
fun get_atps () = CRITICAL (fn () => ! atps);
wenzelm@28586
    49
fun set_atps str = CRITICAL (fn () => atps := str);
wenzelm@28586
    50
wenzelm@28586
    51
fun get_max_atps () = CRITICAL (fn () => ! max_atps);
wenzelm@28586
    52
fun set_max_atps number = CRITICAL (fn () => max_atps := number);
wenzelm@28586
    53
wenzelm@28586
    54
fun get_timeout () = CRITICAL (fn () => ! timeout);
wenzelm@28586
    55
fun set_timeout time = CRITICAL (fn () => timeout := time);
wenzelm@28586
    56
wenzelm@28586
    57
val _ =
wenzelm@30982
    58
  ProofGeneralPgip.add_preference Preferences.category_proof
wenzelm@28586
    59
    (Preferences.string_pref atps
wenzelm@28589
    60
      "ATP: provers" "Default automatic provers (separated by whitespace)");
wenzelm@28586
    61
wenzelm@30982
    62
val _ =
wenzelm@30982
    63
  ProofGeneralPgip.add_preference Preferences.category_proof
wenzelm@28586
    64
    (Preferences.int_pref max_atps
wenzelm@28589
    65
      "ATP: maximum number" "How many provers may run in parallel");
wenzelm@28586
    66
wenzelm@30982
    67
val _ =
wenzelm@30982
    68
  ProofGeneralPgip.add_preference Preferences.category_proof
wenzelm@28586
    69
    (Preferences.int_pref timeout
wenzelm@28589
    70
      "ATP: timeout" "ATPs will be interrupted after this time (in seconds)");
wenzelm@28586
    71
wenzelm@28586
    72
end;
wenzelm@28586
    73
wenzelm@28586
    74
wenzelm@28586
    75
wenzelm@28586
    76
(** thread management **)
wenzelm@28586
    77
wenzelm@28582
    78
(* data structures over threads *)
wenzelm@28582
    79
wenzelm@28582
    80
structure ThreadHeap = HeapFun
wenzelm@28582
    81
(
wenzelm@28582
    82
  type elem = Time.time * Thread.thread;
wenzelm@28582
    83
  fun ord ((a, _), (b, _)) = Time.compare (a, b);
wenzelm@28595
    84
);
wenzelm@28582
    85
wenzelm@31368
    86
fun lookup_thread xs = AList.lookup Thread.equal xs;
wenzelm@31368
    87
fun delete_thread xs = AList.delete Thread.equal xs;
wenzelm@31368
    88
fun update_thread xs = AList.update Thread.equal xs;
wenzelm@28582
    89
wenzelm@28582
    90
wenzelm@28582
    91
(* state of thread manager *)
wenzelm@28477
    92
wenzelm@28582
    93
datatype T = State of
immler@30830
    94
 {managing_thread: Thread.thread option,
immler@30830
    95
  timeout_heap: ThreadHeap.T,
wenzelm@28582
    96
  oldest_heap: ThreadHeap.T,
wenzelm@28582
    97
  active: (Thread.thread * (Time.time * Time.time * string)) list,
wenzelm@29112
    98
  cancelling: (Thread.thread * (Time.time * Time.time * string)) list,
immler@29620
    99
  messages: string list,
immler@29620
   100
  store: string list};
wenzelm@28582
   101
immler@30830
   102
fun make_state managing_thread timeout_heap oldest_heap active cancelling messages store =
immler@30830
   103
  State {managing_thread = managing_thread, timeout_heap = timeout_heap, oldest_heap = oldest_heap,
immler@29620
   104
    active = active, cancelling = cancelling, messages = messages, store = store};
wenzelm@28582
   105
immler@30830
   106
val state = Synchronized.var "atp_manager"
immler@30830
   107
  (make_state NONE ThreadHeap.empty ThreadHeap.empty [] [] [] []);
wenzelm@28582
   108
wenzelm@31368
   109
wenzelm@29150
   110
(* unregister thread *)
wenzelm@28582
   111
immler@29620
   112
fun unregister (success, message) thread = Synchronized.change state
immler@30830
   113
  (fn state as State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
wenzelm@29150
   114
    (case lookup_thread active thread of
wenzelm@29150
   115
      SOME (birthtime, _, description) =>
wenzelm@29150
   116
        let
wenzelm@29150
   117
          val (group, active') =
wenzelm@29150
   118
            if success then List.partition (fn (_, (tb, _, _)) => tb = birthtime) active
wenzelm@29150
   119
            else List.partition (fn (th, _) => Thread.equal (th, thread)) active
wenzelm@28582
   120
wenzelm@29150
   121
          val now = Time.now ()
wenzelm@29150
   122
          val cancelling' =
immler@29620
   123
            fold (fn (th, (tb, _, desc)) => update_thread (th, (tb, now, desc))) group cancelling
wenzelm@28582
   124
immler@29620
   125
          val message' = description ^ "\n" ^ message ^
immler@29596
   126
            (if length group <= 1 then ""
immler@29596
   127
             else "\nInterrupted " ^ string_of_int (length group - 1) ^ " other group members")
immler@29620
   128
          val store' = message' ::
immler@29620
   129
            (if length store <= message_store_limit then store
immler@29620
   130
             else #1 (chop message_store_limit store))
immler@30830
   131
        in make_state
immler@30830
   132
          managing_thread timeout_heap oldest_heap active' cancelling' (message' :: messages) store'
immler@30830
   133
        end
wenzelm@30800
   134
    | NONE => state));
wenzelm@28582
   135
wenzelm@28582
   136
wenzelm@28595
   137
(* kill excessive atp threads *)
wenzelm@28595
   138
wenzelm@28595
   139
fun excessive_atps active =
wenzelm@28595
   140
  let val max = get_max_atps ()
wenzelm@28595
   141
  in length active > max andalso max > ~1 end;
wenzelm@28595
   142
wenzelm@28595
   143
local
wenzelm@28595
   144
wenzelm@28595
   145
fun kill_oldest () =
wenzelm@28595
   146
  let exception Unchanged in
wenzelm@29112
   147
    Synchronized.change_result state
immler@30830
   148
      (fn State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
wenzelm@28595
   149
        if ThreadHeap.is_empty oldest_heap orelse not (excessive_atps active)
wenzelm@28595
   150
        then raise Unchanged
wenzelm@28595
   151
        else
wenzelm@28595
   152
          let val ((_, oldest_thread), oldest_heap') = ThreadHeap.min_elem oldest_heap
immler@30830
   153
          in (oldest_thread,
immler@30830
   154
          make_state managing_thread timeout_heap oldest_heap' active cancelling messages store) end)
immler@29620
   155
      |> unregister (false, "Interrupted (maximum number of ATPs exceeded)")
wenzelm@28595
   156
    handle Unchanged => ()
wenzelm@28595
   157
  end;
wenzelm@28595
   158
wenzelm@28595
   159
in
wenzelm@28595
   160
wenzelm@28595
   161
fun kill_excessive () =
wenzelm@28595
   162
  let val State {active, ...} = Synchronized.value state
wenzelm@28595
   163
  in if excessive_atps active then (kill_oldest (); kill_excessive ()) else () end;
wenzelm@28595
   164
wenzelm@28595
   165
end;
wenzelm@28595
   166
immler@29620
   167
fun print_new_messages () =
immler@29620
   168
  let val to_print = Synchronized.change_result state
immler@30830
   169
    (fn State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
immler@30830
   170
      (messages, make_state managing_thread timeout_heap oldest_heap active cancelling [] store))
wenzelm@30800
   171
  in
wenzelm@30800
   172
    if null to_print then ()
wenzelm@30800
   173
    else priority ("Sledgehammer: " ^ space_implode "\n\n" to_print)
wenzelm@30800
   174
  end;
immler@29620
   175
wenzelm@28595
   176
wenzelm@30800
   177
(* start a watching thread -- only one may exist *)
wenzelm@28582
   178
immler@30830
   179
fun check_thread_manager () = Synchronized.change state
immler@30830
   180
  (fn State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
immler@30830
   181
    if (case managing_thread of SOME thread => Thread.isActive thread | NONE => false)
immler@30830
   182
    then make_state managing_thread timeout_heap oldest_heap active cancelling messages store
immler@30830
   183
    else let val managing_thread = SOME (SimpleThread.fork false (fn () =>
immler@30830
   184
      let
immler@30830
   185
        val min_wait_time = Time.fromMilliseconds 300
immler@30830
   186
        val max_wait_time = Time.fromSeconds 10
wenzelm@28582
   187
immler@30830
   188
        (* wait for next thread to cancel, or maximum*)
immler@30830
   189
        fun time_limit (State {timeout_heap, ...}) =
immler@30830
   190
          (case try ThreadHeap.min timeout_heap of
immler@30830
   191
            NONE => SOME (Time.+ (Time.now (), max_wait_time))
immler@30830
   192
          | SOME (time, _) => SOME time)
wenzelm@28582
   193
immler@30830
   194
        (* action: find threads whose timeout is reached, and interrupt cancelling threads *)
immler@30830
   195
        fun action (State {managing_thread, timeout_heap, oldest_heap, active, cancelling,
immler@30830
   196
                           messages, store}) =
immler@30830
   197
          let val (timeout_threads, timeout_heap') =
immler@30830
   198
            ThreadHeap.upto (Time.now (), Thread.self ()) timeout_heap
immler@30830
   199
          in
immler@30830
   200
            if null timeout_threads andalso null cancelling andalso not (excessive_atps active)
immler@30830
   201
            then NONE
immler@30830
   202
            else
immler@30830
   203
              let
immler@30830
   204
                val _ = List.app (SimpleThread.interrupt o #1) cancelling
immler@30830
   205
                val cancelling' = filter (Thread.isActive o #1) cancelling
immler@30830
   206
                val state' = make_state
immler@30830
   207
                  managing_thread timeout_heap' oldest_heap active cancelling' messages store
immler@30830
   208
              in SOME (map #2 timeout_threads, state') end
immler@30830
   209
          end
immler@30830
   210
      in
immler@30830
   211
        while Synchronized.change_result state
immler@30830
   212
          (fn st as
immler@30830
   213
            State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
immler@30830
   214
            if (null active) andalso (null cancelling) andalso (null messages)
immler@30830
   215
            then (false, make_state NONE timeout_heap oldest_heap active cancelling messages store)
immler@30830
   216
            else (true, st))
immler@30830
   217
        do
immler@30830
   218
          (Synchronized.timed_access state time_limit action
immler@30830
   219
            |> these
immler@30830
   220
            |> List.app (unregister (false, "Interrupted (reached timeout)"));
immler@30830
   221
            kill_excessive ();
immler@30830
   222
            print_new_messages ();
immler@30830
   223
            (*give threads time to respond to interrupt*)
immler@30830
   224
            OS.Process.sleep min_wait_time)
immler@30830
   225
      end))
immler@30830
   226
    in make_state managing_thread timeout_heap oldest_heap active cancelling messages store end);
wenzelm@28582
   227
wenzelm@28582
   228
wenzelm@28582
   229
(* thread is registered here by sledgehammer *)
wenzelm@28477
   230
wenzelm@28582
   231
fun register birthtime deadtime (thread, desc) =
immler@30798
   232
 (Synchronized.change state
immler@30830
   233
    (fn State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
wenzelm@29112
   234
      let
wenzelm@29112
   235
        val timeout_heap' = ThreadHeap.insert (deadtime, thread) timeout_heap
wenzelm@29112
   236
        val oldest_heap' = ThreadHeap.insert (birthtime, thread) oldest_heap
wenzelm@29112
   237
        val active' = update_thread (thread, (birthtime, deadtime, desc)) active
immler@30830
   238
      in make_state managing_thread timeout_heap' oldest_heap' active' cancelling messages store end);
immler@30798
   239
  check_thread_manager ());
wenzelm@28477
   240
wenzelm@28477
   241
wenzelm@28586
   242
wenzelm@28586
   243
(** user commands **)
wenzelm@28582
   244
wenzelm@28586
   245
(* kill: move all threads to cancelling *)
wenzelm@28586
   246
wenzelm@28586
   247
fun kill () = Synchronized.change state
immler@30830
   248
  (fn State {managing_thread, timeout_heap, oldest_heap, active, cancelling, messages, store} =>
wenzelm@28582
   249
    let val formerly_active = map (fn (th, (tb, _, desc)) => (th, (tb, Time.now (), desc))) active
immler@30830
   250
    in make_state
immler@30830
   251
      managing_thread timeout_heap oldest_heap [] (formerly_active @ cancelling) messages store
immler@30830
   252
    end);
wenzelm@28582
   253
wenzelm@28582
   254
wenzelm@29112
   255
(* ATP info *)
wenzelm@28582
   256
wenzelm@28582
   257
fun info () =
wenzelm@28582
   258
  let
wenzelm@29112
   259
    val State {active, cancelling, ...} = Synchronized.value state
wenzelm@29112
   260
wenzelm@28571
   261
    fun running_info (_, (birth_time, dead_time, desc)) = "Running: "
wenzelm@28589
   262
        ^ (string_of_int o Time.toSeconds) (Time.- (Time.now (), birth_time))
wenzelm@28477
   263
        ^ " s  --  "
wenzelm@28589
   264
        ^ (string_of_int o Time.toSeconds) (Time.- (dead_time, Time.now ()))
wenzelm@28571
   265
        ^ " s to live:\n" ^ desc
wenzelm@28571
   266
    fun cancelling_info (_, (_, dead_time, desc)) = "Trying to interrupt thread since "
wenzelm@28586
   267
        ^ (string_of_int o Time.toSeconds) (Time.- (Time.now (), dead_time))
wenzelm@28571
   268
        ^ " s:\n" ^ desc
wenzelm@29112
   269
wenzelm@28589
   270
    val running =
wenzelm@28589
   271
      if null active then "No ATPs running."
wenzelm@28589
   272
      else space_implode "\n\n" ("Running ATPs:" :: map running_info active)
wenzelm@28589
   273
    val interrupting =
wenzelm@28589
   274
      if null cancelling then ""
wenzelm@28589
   275
      else space_implode "\n\n"
wenzelm@28589
   276
        ("Trying to interrupt the following ATPs:" :: map cancelling_info cancelling)
wenzelm@29112
   277
wenzelm@28582
   278
  in writeln (running ^ "\n" ^ interrupting) end;
wenzelm@28582
   279
wenzelm@29112
   280
fun messages opt_limit =
wenzelm@29112
   281
  let
wenzelm@29112
   282
    val limit = the_default message_display_limit opt_limit;
immler@29620
   283
    val State {store = msgs, ...} = Synchronized.value state
wenzelm@29112
   284
    val header = "Recent ATP messages" ^
wenzelm@29112
   285
      (if length msgs <= limit then ":" else " (" ^ string_of_int limit ^ " displayed):");
wenzelm@29116
   286
  in writeln (space_implode "\n\n" (header :: #1 (chop limit msgs))) end;
wenzelm@29112
   287
wenzelm@28582
   288
wenzelm@28477
   289
wenzelm@28586
   290
(** The Sledgehammer **)
wenzelm@28477
   291
wenzelm@28582
   292
(* named provers *)
wenzelm@28484
   293
immler@31409
   294
type prover = int -> (thm * (string * int)) list option ->
immler@31752
   295
  (thm * (string * int)) list option -> string -> int ->
immler@31409
   296
  Proof.context * (thm list * thm) ->
immler@31752
   297
  bool * string * string * string vector * (thm * (string * int)) list
wenzelm@28595
   298
wenzelm@28582
   299
fun err_dup_prover name = error ("Duplicate prover: " ^ quote name);
wenzelm@28477
   300
wenzelm@28582
   301
structure Provers = TheoryDataFun
wenzelm@28582
   302
(
wenzelm@28595
   303
  type T = (prover * stamp) Symtab.table
wenzelm@28582
   304
  val empty = Symtab.empty
wenzelm@28582
   305
  val copy = I
wenzelm@28582
   306
  val extend = I
wenzelm@28582
   307
  fun merge _ tabs : T = Symtab.merge (eq_snd op =) tabs
wenzelm@28589
   308
    handle Symtab.DUP dup => err_dup_prover dup
wenzelm@28582
   309
);
wenzelm@28484
   310
wenzelm@28595
   311
fun add_prover name prover thy =
wenzelm@28595
   312
  Provers.map (Symtab.update_new (name, (prover, stamp ()))) thy
wenzelm@28582
   313
    handle Symtab.DUP dup => err_dup_prover dup;
wenzelm@28582
   314
wenzelm@28582
   315
fun print_provers thy = Pretty.writeln
wenzelm@28582
   316
  (Pretty.strs ("external provers:" :: sort_strings (Symtab.keys (Provers.get thy))));
wenzelm@28571
   317
immler@31037
   318
fun get_prover name thy = case Symtab.lookup (Provers.get thy) name of
immler@31037
   319
  NONE => NONE
immler@31037
   320
| SOME (prover, _) => SOME prover;
wenzelm@28586
   321
wenzelm@28595
   322
(* start prover thread *)
wenzelm@28484
   323
wenzelm@28595
   324
fun start_prover name birthtime deadtime i proof_state =
immler@31037
   325
  (case get_prover name (Proof.theory_of proof_state) of
wenzelm@28595
   326
    NONE => warning ("Unknown external prover: " ^ quote name)
immler@31037
   327
  | SOME prover =>
wenzelm@28595
   328
      let
wenzelm@28595
   329
        val (ctxt, (_, goal)) = Proof.get_goal proof_state
wenzelm@28595
   330
        val desc =
wenzelm@28595
   331
          "external prover " ^ quote name ^ " for subgoal " ^ string_of_int i ^ ":\n" ^
wenzelm@28595
   332
            Syntax.string_of_term ctxt (Thm.term_of (Thm.cprem_of goal i))
wenzelm@28595
   333
        val _ = SimpleThread.fork true (fn () =>
wenzelm@28595
   334
          let
wenzelm@28595
   335
            val _ = register birthtime deadtime (Thread.self (), desc)
immler@31037
   336
            val result =
immler@31409
   337
              let val (success, message, _, _, _) =
immler@31409
   338
                prover (get_timeout ()) NONE NONE name i (Proof.get_goal proof_state)
immler@31037
   339
              in (success, message) end
wenzelm@28835
   340
              handle ResHolClause.TOO_TRIVIAL
wenzelm@28835
   341
                => (true, "Empty clause: Try this command: " ^ Markup.markup Markup.sendback "apply metis")
wenzelm@28835
   342
              | ERROR msg
wenzelm@28835
   343
                => (false, "Error: " ^ msg)
immler@29620
   344
            val _ = unregister result (Thread.self ())
wenzelm@28595
   345
          in () end handle Interrupt => ())
wenzelm@28595
   346
      in () end);
wenzelm@28582
   347
wenzelm@28582
   348
wenzelm@28582
   349
(* sledghammer for first subgoal *)
wenzelm@28582
   350
wenzelm@28582
   351
fun sledgehammer names proof_state =
wenzelm@28582
   352
  let
wenzelm@28595
   353
    val provers =
wenzelm@28586
   354
      if null names then String.tokens (Symbol.is_ascii_blank o String.str) (get_atps ())
wenzelm@28582
   355
      else names
wenzelm@28582
   356
    val birthtime = Time.now ()
wenzelm@28595
   357
    val deadtime = Time.+ (birthtime, Time.fromSeconds (get_timeout ()))
wenzelm@28595
   358
  in List.app (fn name => start_prover name birthtime deadtime 1 proof_state) provers end;
wenzelm@28582
   359
wenzelm@28582
   360
wenzelm@28586
   361
wenzelm@28586
   362
(** Isar command syntax **)
wenzelm@28582
   363
wenzelm@28582
   364
local structure K = OuterKeyword and P = OuterParse in
wenzelm@28582
   365
wenzelm@28582
   366
val _ =
wenzelm@28582
   367
  OuterSyntax.improper_command "atp_kill" "kill all managed provers" K.diag
wenzelm@28586
   368
    (Scan.succeed (Toplevel.no_timing o Toplevel.imperative kill));
wenzelm@28582
   369
wenzelm@28582
   370
val _ =
wenzelm@28582
   371
  OuterSyntax.improper_command "atp_info" "print information about managed provers" K.diag
wenzelm@28582
   372
    (Scan.succeed (Toplevel.no_timing o Toplevel.imperative info));
wenzelm@28582
   373
wenzelm@28582
   374
val _ =
wenzelm@29112
   375
  OuterSyntax.improper_command "atp_messages" "print recent messages issued by managed provers" K.diag
wenzelm@29112
   376
    (Scan.option (P.$$$ "(" |-- P.nat --| P.$$$ ")") >>
wenzelm@29112
   377
      (fn limit => Toplevel.no_timing o Toplevel.imperative (fn () => messages limit)));
wenzelm@29112
   378
wenzelm@29112
   379
val _ =
wenzelm@28582
   380
  OuterSyntax.improper_command "print_atps" "print external provers" K.diag
wenzelm@28582
   381
    (Scan.succeed (Toplevel.no_timing o Toplevel.unknown_theory o
wenzelm@28582
   382
      Toplevel.keep (print_provers o Toplevel.theory_of)));
wenzelm@28582
   383
wenzelm@28582
   384
val _ =
wenzelm@28582
   385
  OuterSyntax.command "sledgehammer" "call all automatic theorem provers" K.diag
wenzelm@28582
   386
    (Scan.repeat P.xname >> (fn names => Toplevel.no_timing o Toplevel.unknown_proof o
wenzelm@30800
   387
      Toplevel.keep (sledgehammer names o Toplevel.proof_of)));
wenzelm@28582
   388
wenzelm@28582
   389
end;
wenzelm@28582
   390
wenzelm@28582
   391
end;
immler@30537
   392