8 let debug_print = if debug then prerr_endline else ignore ;;
10 (** create a ProofEngineTypes.mk_fresh_name_type function which uses given
11 * names as long as they are available, then it fallbacks to name generation
12 * using FreshNamesGenerator module *)
14 let len = List.length names in
16 fun metasenv context name ~typ ->
17 if !count < len then begin
18 let name = Cic.Name (List.nth names !count) in
22 FreshNamesGenerator.mk_fresh_name ~subst:[] metasenv context name ~typ
24 let tactic_of_ast = function
25 | TacticAst.Absurd (_, term) -> Tactics.absurd term
26 | TacticAst.Apply (_, term) -> Tactics.apply term
27 | TacticAst.Assumption _ -> Tactics.assumption
28 | TacticAst.Auto (_,depth,width) ->
29 AutoTactic.auto_tac ?depth ?width ~dbd:(MatitaDb.instance ()) ()
30 | TacticAst.Change (_, pattern, with_what) ->
31 Tactics.change ~pattern with_what
32 | TacticAst.Clear (_,id) -> Tactics.clear id
33 | TacticAst.ClearBody (_,id) -> Tactics.clearbody id
34 | TacticAst.Contradiction _ -> Tactics.contradiction
35 | TacticAst.Compare (_, term) -> Tactics.compare term
36 | TacticAst.Constructor (_, n) -> Tactics.constructor n
37 | TacticAst.Cut (_, ident, term) ->
38 let names = match ident with None -> [] | Some id -> [id] in
39 Tactics.cut ~mk_fresh_name_callback:(namer_of names) term
40 | TacticAst.DecideEquality _ -> Tactics.decide_equality
41 | TacticAst.Decompose (_,term) -> Tactics.decompose term
42 | TacticAst.Discriminate (_,term) -> Tactics.discriminate term
43 | TacticAst.Elim (_, term, _) ->
44 Tactics.elim_intros term
45 | TacticAst.ElimType (_, term) -> Tactics.elim_type term
46 | TacticAst.Exact (_, term) -> Tactics.exact term
47 | TacticAst.Exists _ -> Tactics.exists
48 | TacticAst.Fail _ -> Tactics.fail
49 | TacticAst.Fold (_, reduction_kind, term, pattern) ->
51 match reduction_kind with
52 | `Normalize -> CicReduction.normalize ~delta:false ~subst:[]
53 | `Reduce -> ProofEngineReduction.reduce
54 | `Simpl -> ProofEngineReduction.simpl
55 | `Whd -> CicReduction.whd ~delta:false ~subst:[]
57 Tactics.fold ~reduction ~term ~pattern
58 | TacticAst.Fourier _ -> Tactics.fourier
59 | TacticAst.FwdSimpl (_, hyp, names) ->
60 Tactics.fwd_simpl ~mk_fresh_name_callback:(namer_of names) ~dbd:(MatitaDb.instance ()) hyp
61 | TacticAst.Generalize (_,pattern,ident) ->
62 let names = match ident with None -> [] | Some id -> [id] in
63 Tactics.generalize ~mk_fresh_name_callback:(namer_of names) pattern
64 | TacticAst.Goal (_, n) -> Tactics.set_goal n
65 | TacticAst.IdTac _ -> Tactics.id
66 | TacticAst.Injection (_,term) -> Tactics.injection term
67 | TacticAst.Intros (_, None, names) ->
68 PrimitiveTactics.intros_tac ~mk_fresh_name_callback:(namer_of names) ()
69 | TacticAst.Intros (_, Some num, names) ->
70 PrimitiveTactics.intros_tac ~howmany:num
71 ~mk_fresh_name_callback:(namer_of names) ()
72 | TacticAst.LApply (_, how_many, to_what, what, ident) ->
73 let names = match ident with None -> [] | Some id -> [id] in
74 Tactics.lapply ~mk_fresh_name_callback:(namer_of names) ?how_many ~to_what what
75 | TacticAst.Left _ -> Tactics.left
76 | TacticAst.LetIn (loc,term,name) ->
77 Tactics.letin term ~mk_fresh_name_callback:(namer_of [name])
78 | TacticAst.Reduce (_, reduction_kind, pattern) ->
79 (match reduction_kind with
80 | `Normalize -> Tactics.normalize ~pattern
81 | `Reduce -> Tactics.reduce ~pattern
82 | `Simpl -> Tactics.simpl ~pattern
83 | `Whd -> Tactics.whd ~pattern)
84 | TacticAst.Reflexivity _ -> Tactics.reflexivity
85 | TacticAst.Replace (_, pattern, with_what) ->
86 Tactics.replace ~pattern ~with_what
87 | TacticAst.Rewrite (_, direction, t, pattern) ->
88 EqualityTactics.rewrite_tac ~direction ~pattern t
89 | TacticAst.Right _ -> Tactics.right
90 | TacticAst.Ring _ -> Tactics.ring
91 | TacticAst.Split _ -> Tactics.split
92 | TacticAst.Symmetry _ -> Tactics.symmetry
93 | TacticAst.Transitivity (_, term) -> Tactics.transitivity term
95 let eval_tactical status tac =
96 let apply_tactic tactic =
98 ProofEngineTypes.apply_tactic tactic (MatitaMisc.get_proof_status status)
103 let (_,metasenv,_,_) = proof in
106 | (ng,_,_)::_ -> Incomplete_proof (proof,ng))
107 | ng::_ -> Incomplete_proof (proof, ng)
109 { status with proof_status = new_status }
111 let rec tactical_of_ast = function
112 | TacticAst.Tactic (loc, tactic) -> tactic_of_ast tactic
113 | TacticAst.Do (loc, num, tactical) ->
114 Tacticals.do_tactic num (tactical_of_ast tactical)
115 | TacticAst.Repeat (loc, tactical) ->
116 Tacticals.repeat_tactic (tactical_of_ast tactical)
117 | TacticAst.Seq (loc, tacticals) -> (* tac1; tac2; ... *)
118 Tacticals.seq (List.map tactical_of_ast tacticals)
119 | TacticAst.Then (loc, tactical, tacticals) -> (* tac; [ tac1 | ... ] *)
120 Tacticals.thens (tactical_of_ast tactical)
121 (List.map tactical_of_ast tacticals)
122 | TacticAst.Tries (loc, tacticals) ->
123 Tacticals.try_tactics
124 (List.map (fun t -> "", tactical_of_ast t) tacticals)
125 | TacticAst.Try (loc, tactical) ->
126 Tacticals.try_tactic (tactical_of_ast tactical)
128 apply_tactic (tactical_of_ast tac)
130 let eval_coercion status coercion =
131 let coer_uri,coer_ty =
136 CicEnvironment.get_obj CicUniv.empty_ugraph uri
139 | Cic.Constant (_,_,ty,_,_)
140 | Cic.Variable (_,_,ty,_,_) ->
143 | Cic.MutConstruct (uri,t,c,_) ->
145 CicEnvironment.get_obj CicUniv.empty_ugraph uri
148 | Cic.InductiveDefinition (l,_,_,_) ->
149 let (_,_,_,cl) = List.nth l t in
150 let (_,cty) = List.nth cl c in
155 (* we have to get the source and the tgt type uri
156 * in Coq syntax we have already their names, but
157 * since we don't support Funclass and similar I think
158 * all the coercion should be of the form
160 * So we should be able to extract them from the coercion type
162 let extract_last_two_p ty =
163 let rec aux = function
164 | Cic.Prod( _, src, Cic.Prod (n,t1,t2)) -> aux (Cic.Prod(n,t1,t2))
165 | Cic.Prod( _, src, tgt) -> src, tgt
170 let ty_src,ty_tgt = extract_last_two_p coer_ty in
173 let ty_src = CicReduction.whd context ty_src in
174 CicUtil.uri_of_term ty_src
177 let ty_tgt = CicReduction.whd context ty_tgt in
178 CicUtil.uri_of_term ty_tgt
181 (* also adds them to the Db *)
182 CoercGraph.close_coercion_graph src_uri tgt_uri coer_uri in
184 List.fold_left (fun s (uri,o,ugraph) -> MatitaSync.add_obj uri o status)
185 status new_coercions in
186 {status with proof_status = No_proof}
188 let generate_elimination_principles uri status =
189 let elim sort status =
191 let uri,obj = CicElim.elim_of ~sort uri 0 in
192 MatitaSync.add_obj uri obj status
193 with CicElim.Can_t_eliminate -> status
195 List.fold_left (fun status sort -> elim sort status) status
196 [ Cic.Prop; Cic.Set; (Cic.Type (CicUniv.fresh ())) ]
198 let generate_projections uri fields status =
199 let projections = CicRecord.projections_of uri fields in
201 (fun status (uri, name, bo) ->
204 CicTypeChecker.type_of_aux' [] [] bo CicUniv.empty_ugraph in
205 let bo = Unshare.unshare bo in
206 let ty = Unshare.unshare ty in
207 let attrs = [`Class `Projection; `Generated] in
208 let obj = Cic.Constant (name,Some bo,ty,[],attrs) in
209 MatitaSync.add_obj uri obj status
211 CicTypeChecker.TypeCheckerFailure s ->
213 ("Unable to create projection " ^ name ^ " cause: " ^ s);
215 | CicEnvironment.Object_not_found uri ->
216 let depend = UriManager.name_of_uri uri in
218 ("Unable to create projection " ^ name ^ " because it requires " ^ depend);
222 let eval_command output status cmd =
224 | TacticAst.Set (loc, name, value) ->
226 if name = "baseuri" then
227 MatitaMisc.strip_trailing_slash value
231 set_option status name value
232 | TacticAst.Drop loc -> raise Drop
233 | TacticAst.Qed loc ->
234 let uri, metasenv, bo, ty =
235 match status.proof_status with
236 | Proof (Some uri, metasenv, body, ty) ->
237 uri, metasenv, body, ty
238 | Proof (None, metasenv, body, ty) ->
240 ("Someone allows to start a thm without giving the "^
241 "name/uri. This should be fixed!")
242 | _-> command_error "You can't qed an uncomplete theorem"
244 let suri = UriManager.string_of_uri uri in
245 if metasenv <> [] then
246 command_error "Proof not completed! metasenv is not empty!";
247 let name = UriManager.name_of_uri uri in
248 let obj = Cic.Constant (name,Some bo,ty,[],[]) in
249 MatitaSync.add_obj uri obj status
250 | TacticAst.Coercion (loc, coercion) ->
251 eval_coercion status coercion
252 | TacticAst.Alias (loc, spec) ->
255 | TacticAst.Ident_alias (id,uri) ->
256 {status with aliases =
257 DisambiguateTypes.Environment.add
258 (DisambiguateTypes.Id id)
259 ("boh?",(fun _ _ _ -> CicUtil.term_of_uri (UriManager.uri_of_string uri)))
261 | TacticAst.Symbol_alias (symb, instance, desc) ->
262 {status with aliases =
263 DisambiguateTypes.Environment.add
264 (DisambiguateTypes.Symbol (symb,instance))
265 (DisambiguateChoices.lookup_symbol_by_dsc symb desc)
267 | TacticAst.Number_alias (instance,desc) ->
268 {status with aliases =
269 DisambiguateTypes.Environment.add
270 (DisambiguateTypes.Num instance)
271 (DisambiguateChoices.lookup_num_by_dsc desc) status.aliases }
273 output (TacticAstPp.pp_alias spec ^ ".\n");
275 | TacticAst.Obj (loc,obj) ->
278 Cic.Constant (name,_,_,_,_)
279 | Cic.CurrentProof (name,_,_,_,_,_) -> ".con",name
280 | Cic.InductiveDefinition (types,_,_,_) ->
282 (match types with (name,_,_,_)::_ -> name | _ -> assert false)
283 | _ -> assert false in
285 UriManager.uri_of_string (MatitaMisc.qualify status name ^ ext)
287 let metasenv = MatitaMisc.get_proof_metasenv status in
289 Cic.CurrentProof (_,metasenv',bo,ty,_,_) ->
290 assert (metasenv = metasenv');
292 match metasenv' with (goalno,_,_)::_ -> goalno | _ -> assert false in
293 let initial_proof = (Some uri, metasenv, bo, ty) in
294 { status with proof_status = Incomplete_proof (initial_proof,goalno)}
296 if metasenv <> [] then
298 "metasenv not empty while giving a definition with body: " ^
299 CicMetaSubst.ppmetasenv metasenv []);
300 let status = MatitaSync.add_obj uri obj status in
302 Cic.Constant _ -> status
303 | Cic.InductiveDefinition (_,_,_,attrs) ->
304 let status = generate_elimination_principles uri status in
305 let rec get_record_attrs =
308 | (`Class (`Record fields))::_ -> Some fields
309 | _::tl -> get_record_attrs tl
311 (match get_record_attrs attrs with
312 None -> status (* not a record *)
313 | Some fields -> generate_projections uri fields status)
315 | Cic.Variable _ -> assert false
317 let eval_executable output status ex =
319 | TacticAst.Tactical (_, tac) -> eval_tactical status tac
320 | TacticAst.Command (_, cmd) -> eval_command output status cmd
321 | TacticAst.Macro (_, mac) ->
322 command_error (sprintf "The macro %s can't be in a script"
323 (TacticAstPp.pp_macro_cic mac))
325 let eval_comment status c = status
327 let eval output status st =
329 | TacticAst.Executable (_,ex) -> eval_executable output status ex
330 | TacticAst.Comment (_,c) -> eval_comment status c
332 let disambiguate_term status term =
333 let (aliases, metasenv, cic, _) =
335 MatitaDisambiguator.disambiguate_term ~dbd:(MatitaDb.instance ())
336 ~aliases:(status.aliases) ~context:(MatitaMisc.get_proof_context status)
337 ~metasenv:(MatitaMisc.get_proof_metasenv status) term
343 match status.proof_status with
344 | No_proof -> Intermediate metasenv
345 | Incomplete_proof ((uri, _, proof, ty), goal) ->
346 Incomplete_proof ((uri, metasenv, proof, ty), goal)
347 | Intermediate _ -> Intermediate metasenv
348 | Proof _ -> assert false
353 proof_status = proof_status }
357 let disambiguate_obj status obj =
360 TacticAst.Inductive (_,(name,_,_,_)::_)
361 | TacticAst.Record (_,name,_,_) ->
362 Some (UriManager.uri_of_string (MatitaMisc.qualify status name ^ ".ind"))
363 | TacticAst.Inductive _ -> assert false
365 let (aliases, metasenv, cic, _) =
367 MatitaDisambiguator.disambiguate_obj ~dbd:(MatitaDb.instance ())
368 ~aliases:(status.aliases) ~uri obj
374 match status.proof_status with
375 | No_proof -> Intermediate metasenv
378 | Proof _ -> assert false
383 proof_status = proof_status }
387 let disambiguate_pattern status (wanted, hyp_paths, goal_path) =
388 let interp path = Disambiguate.interpretate_path [] status.aliases path in
389 let goal_path = interp goal_path in
390 let hyp_paths = List.map (fun (name, path) -> name, interp path) hyp_paths in
395 let status,wanted = disambiguate_term status wanted in
398 status, (wanted, hyp_paths ,goal_path)
400 let disambiguate_tactic status = function
401 | TacticAst.Apply (loc, term) ->
402 let status, cic = disambiguate_term status term in
403 status, TacticAst.Apply (loc, cic)
404 | TacticAst.Absurd (loc, term) ->
405 let status, cic = disambiguate_term status term in
406 status, TacticAst.Absurd (loc, cic)
407 | TacticAst.Assumption loc -> status, TacticAst.Assumption loc
408 | TacticAst.Auto (loc,depth,width) -> status, TacticAst.Auto (loc,depth,width)
409 | TacticAst.Change (loc, pattern, with_what) ->
410 let status, with_what = disambiguate_term status with_what in
411 let status, pattern = disambiguate_pattern status pattern in
412 status, TacticAst.Change (loc, pattern, with_what)
413 | TacticAst.Clear (loc,id) -> status,TacticAst.Clear (loc,id)
414 | TacticAst.ClearBody (loc,id) -> status,TacticAst.ClearBody (loc,id)
415 | TacticAst.Compare (loc,term) ->
416 let status, term = disambiguate_term status term in
417 status, TacticAst.Compare (loc,term)
418 | TacticAst.Constructor (loc,n) ->
419 status, TacticAst.Constructor (loc,n)
420 | TacticAst.Contradiction loc ->
421 status, TacticAst.Contradiction loc
422 | TacticAst.Cut (loc, ident, term) ->
423 let status, cic = disambiguate_term status term in
424 status, TacticAst.Cut (loc, ident, cic)
425 | TacticAst.DecideEquality loc ->
426 status, TacticAst.DecideEquality loc
427 | TacticAst.Decompose (loc,term) ->
428 let status,term = disambiguate_term status term in
429 status, TacticAst.Decompose(loc,term)
430 | TacticAst.Discriminate (loc,term) ->
431 let status,term = disambiguate_term status term in
432 status, TacticAst.Discriminate(loc,term)
433 | TacticAst.Exact (loc, term) ->
434 let status, cic = disambiguate_term status term in
435 status, TacticAst.Exact (loc, cic)
436 | TacticAst.Elim (loc, term, Some term') ->
437 let status, cic1 = disambiguate_term status term in
438 let status, cic2 = disambiguate_term status term' in
439 status, TacticAst.Elim (loc, cic1, Some cic2)
440 | TacticAst.Elim (loc, term, None) ->
441 let status, cic = disambiguate_term status term in
442 status, TacticAst.Elim (loc, cic, None)
443 | TacticAst.ElimType (loc, term) ->
444 let status, cic = disambiguate_term status term in
445 status, TacticAst.ElimType (loc, cic)
446 | TacticAst.Exists loc -> status, TacticAst.Exists loc
447 | TacticAst.Fail loc -> status,TacticAst.Fail loc
448 | TacticAst.Fold (loc,reduction_kind, term, pattern) ->
449 let status, pattern = disambiguate_pattern status pattern in
450 let status, term = disambiguate_term status term in
451 status, TacticAst.Fold (loc,reduction_kind, term, pattern)
452 | TacticAst.FwdSimpl (loc, hyp, names) ->
453 status, TacticAst.FwdSimpl (loc, hyp, names)
454 | TacticAst.Fourier loc -> status, TacticAst.Fourier loc
455 | TacticAst.Generalize (loc,pattern,ident) ->
456 let status, pattern = disambiguate_pattern status pattern in
457 status, TacticAst.Generalize(loc,pattern,ident)
458 | TacticAst.Goal (loc, g) -> status, TacticAst.Goal (loc, g)
459 | TacticAst.IdTac loc -> status,TacticAst.IdTac loc
460 | TacticAst.Injection (loc,term) ->
461 let status, term = disambiguate_term status term in
462 status, TacticAst.Injection (loc,term)
463 | TacticAst.Intros (loc, num, names) ->
464 status, TacticAst.Intros (loc, num, names)
465 | TacticAst.LApply (loc, depth, to_what, what, ident) ->
466 let f term (status, to_what) =
467 let status, term = disambiguate_term status term in
468 status, term :: to_what
470 let status, to_what = List.fold_right f to_what (status, []) in
471 let status, what = disambiguate_term status what in
472 status, TacticAst.LApply (loc, depth, to_what, what, ident)
473 | TacticAst.Left loc -> status, TacticAst.Left loc
474 | TacticAst.LetIn (loc, term, name) ->
475 let status, term = disambiguate_term status term in
476 status, TacticAst.LetIn (loc,term,name)
477 | TacticAst.Reduce (loc, reduction_kind, pattern) ->
478 let status, pattern = disambiguate_pattern status pattern in
479 status, TacticAst.Reduce(loc, reduction_kind, pattern)
480 | TacticAst.Reflexivity loc -> status, TacticAst.Reflexivity loc
481 | TacticAst.Replace (loc, pattern, with_what) ->
482 let status, pattern = disambiguate_pattern status pattern in
483 let status, with_what = disambiguate_term status with_what in
484 status, TacticAst.Replace (loc, pattern, with_what)
485 | TacticAst.Rewrite (loc, dir, t, pattern) ->
486 let status, term = disambiguate_term status t in
487 let status, pattern = disambiguate_pattern status pattern in
488 status, TacticAst.Rewrite (loc, dir, term, pattern)
489 | TacticAst.Right loc -> status, TacticAst.Right loc
490 | TacticAst.Ring loc -> status, TacticAst.Ring loc
491 | TacticAst.Split loc -> status, TacticAst.Split loc
492 | TacticAst.Symmetry loc -> status, TacticAst.Symmetry loc
493 | TacticAst.Transitivity (loc, term) ->
494 let status, cic = disambiguate_term status term in
495 status, TacticAst.Transitivity (loc, cic)
497 let rec disambiguate_tactical status = function
498 | TacticAst.Tactic (loc, tactic) ->
499 let status, tac = disambiguate_tactic status tactic in
500 status, TacticAst.Tactic (loc, tac)
501 | TacticAst.Do (loc, num, tactical) ->
502 let status, tac = disambiguate_tactical status tactical in
503 status, TacticAst.Do (loc, num, tac)
504 | TacticAst.Repeat (loc, tactical) ->
505 let status, tac = disambiguate_tactical status tactical in
506 status, TacticAst.Repeat (loc, tac)
507 | TacticAst.Seq (loc, tacticals) -> (* tac1; tac2; ... *)
508 let status, tacticals = disambiguate_tacticals status tacticals in
509 let tacticals = List.rev tacticals in
510 status, TacticAst.Seq (loc, tacticals)
511 | TacticAst.Then (loc, tactical, tacticals) -> (* tac; [ tac1 | ... ] *)
512 let status, tactical = disambiguate_tactical status tactical in
513 let status, tacticals = disambiguate_tacticals status tacticals in
514 status, TacticAst.Then (loc, tactical, tacticals)
515 | TacticAst.Tries (loc, tacticals) ->
516 let status, tacticals = disambiguate_tacticals status tacticals in
517 status, TacticAst.Tries (loc, tacticals)
518 | TacticAst.Try (loc, tactical) ->
519 let status, tactical = disambiguate_tactical status tactical in
520 status, TacticAst.Try (loc, tactical)
522 and disambiguate_tacticals status tacticals =
523 let status, tacticals =
525 (fun (status, tacticals) tactical ->
526 let status, tac = disambiguate_tactical status tactical in
527 status, tac :: tacticals)
531 let tacticals = List.rev tacticals in
534 let disambiguate_command status = function
535 | TacticAst.Coercion (loc, term) ->
536 let status, term = disambiguate_term status term in
537 status, TacticAst.Coercion (loc,term)
538 | (TacticAst.Set _ | TacticAst.Qed _ | TacticAst.Drop _ ) as cmd ->
540 | TacticAst.Alias _ as x -> status, x
541 | TacticAst.Obj (loc,obj) ->
542 let status,obj = disambiguate_obj status obj in
543 status, TacticAst.Obj (loc,obj)
545 let disambiguate_executable status ex =
547 | TacticAst.Tactical (loc, tac) ->
548 let status, tac = disambiguate_tactical status tac in
549 status, (TacticAst.Tactical (loc, tac))
550 | TacticAst.Command (loc, cmd) ->
551 let status, cmd = disambiguate_command status cmd in
552 status, (TacticAst.Command (loc, cmd))
553 | TacticAst.Macro (_, mac) ->
554 command_error (sprintf "The macro %s can't be in a script"
555 (TacticAstPp.pp_macro_ast mac))
557 let disambiguate_comment status c =
559 | TacticAst.Note (loc,n) -> status, TacticAst.Note (loc,n)
560 | TacticAst.Code (loc,ex) ->
561 let status, ex = disambiguate_executable status ex in
562 status, TacticAst.Code (loc,ex)
564 let disambiguate_statement status statement =
566 | TacticAst.Comment (loc,c) ->
567 let status, c = disambiguate_comment status c in
568 status, TacticAst.Comment (loc,c)
569 | TacticAst.Executable (loc,ex) ->
570 let status, ex = disambiguate_executable status ex in
571 status, TacticAst.Executable (loc,ex)
573 let eval_ast output status ast =
574 let status,st = disambiguate_statement status ast in
575 (* this disambiguation step should be deferred to support tacticals *)
576 eval output status st
578 let eval_from_stream output status str cb =
579 let stl = CicTextualParser2.parse_statements str in
581 (fun ast -> cb !status ast;status := eval_ast output !status ast) stl
583 let eval_from_stream_greedy output status str cb =
585 print_string "matita> ";
587 let ast = CicTextualParser2.parse_statement str in
589 status := eval_ast output !status ast
592 let eval_string output status str =
593 eval_from_stream output status (Stream.of_string str) (fun _ _ -> ())
595 let default_options () =
598 StringMap.add "baseuri"
600 (Helm_registry.get "matita.baseuri" ^ Helm_registry.get "matita.owner"))
605 StringMap.add "basedir"
606 (String (Helm_registry.get "matita.basedir" ))
613 aliases = DisambiguateTypes.empty_environment;
614 proof_status = No_proof;
615 options = default_options ();