src/Pure/axclass.ML
author wenzelm
Sat, 11 Mar 2006 16:53:20 +0100
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parent 19134 47d337aefc21
child 19392 a631cd2117a8
permissions -rw-r--r--
moved read_class, read/cert_classrel/arity to sign.ML; axclass: moved outer syntax to isar_syn.ML; instance: moved to Tools/class_package.ML; simplified interfaces; tuned;
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(*  Title:      Pure/axclass.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Axiomatic type classes: pure logical content.
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*)
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signature AX_CLASS =
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sig
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  val mk_classrel: class * class -> term
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  val dest_classrel: term -> class * class
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  val mk_arity: string * sort list * class -> term
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  val mk_arities: string * sort list * sort -> term list
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  val dest_arity: term -> string * sort list * class
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  val print_axclasses: theory -> unit
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  val get_info: theory -> string -> {super_classes: class list, intro: thm, axioms: thm list}
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  val class_intros: theory -> thm list
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  val add_axclass: bstring * xstring list -> ((bstring * string) * Attrib.src list) list ->
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    theory -> {intro: thm, axioms: thm list} * theory
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  val add_axclass_i: bstring * class list -> ((bstring * term) * attribute list) list ->
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    theory -> {intro: thm, axioms: thm list} * theory
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  val add_classrel: thm list -> theory -> theory
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  val add_arity: thm list -> theory -> theory
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  val prove_subclass: class * class -> tactic -> theory -> theory
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  val prove_arity: string * sort list * sort -> tactic -> theory -> theory
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end;
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structure AxClass: AX_CLASS =
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struct
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(** abstract syntax operations **)
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fun aT S = TFree ("'a", S);
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fun dest_varT (TFree (x, S)) = ((x, ~1), S)
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  | dest_varT (TVar a) = a
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  | dest_varT T = raise TYPE ("AxClass.dest_varT", [T], []);
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(* subclass propositions *)
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fun mk_classrel (c1, c2) = Logic.mk_inclass (aT [c1], c2);
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fun dest_classrel tm =
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  let
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    fun err () = raise TERM ("AxClass.dest_classrel", [tm]);
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    val (ty, c2) = Logic.dest_inclass tm handle TERM _ => err ();
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    val c1 = (case dest_varT ty of (_, [c]) => c | _ => err ())
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      handle TYPE _ => err ();
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  in (c1, c2) end;
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(* arity propositions *)
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fun mk_arity (t, Ss, c) =
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  let
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    val tfrees = ListPair.map TFree (Term.invent_names [] "'a" (length Ss), Ss);
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  in Logic.mk_inclass (Type (t, tfrees), c) end;
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fun mk_arities (t, Ss, S) = map (fn c => mk_arity (t, Ss, c)) S;
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fun dest_arity tm =
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  let
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    fun err () = raise TERM ("AxClass.dest_arity", [tm]);
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    val (ty, c) = Logic.dest_inclass tm handle TERM _ => err ();
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    val (t, tvars) =
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      (case ty of
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        Type (t, tys) => (t, map dest_varT tys handle TYPE _ => err ())
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      | _ => err ());
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    val ss =
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      if has_duplicates (eq_fst (op =)) tvars then err ()
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      else map snd tvars;
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  in (t, ss, c) end;
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(** axclass info **)
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val introN = "intro";
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val axiomsN = "axioms";
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type axclass_info =
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  {super_classes: class list,
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    intro: thm,
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    axioms: thm list};
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structure AxclassesData = TheoryDataFun
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(struct
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  val name = "Pure/axclasses";
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  type T = axclass_info Symtab.table;
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  val empty = Symtab.empty;
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  val copy = I;
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  val extend = I;
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  fun merge _ = Symtab.merge (K true);
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  fun print thy tab =
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    let
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      fun pretty_class c cs = Pretty.block
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        (Pretty.str (Sign.extern_class thy c) :: Pretty.str " <" :: Pretty.brk 1 ::
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          Pretty.breaks (map (Pretty.str o Sign.extern_class thy) cs));
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      fun pretty_thms name thms = Pretty.big_list (name ^ ":")
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        (map (Display.pretty_thm_sg thy) thms);
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      fun pretty_axclass (name, {super_classes, intro, axioms}) = Pretty.block (Pretty.fbreaks
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        [pretty_class name super_classes, pretty_thms introN [intro], pretty_thms axiomsN axioms]);
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    in Pretty.writeln (Pretty.chunks (map pretty_axclass (Symtab.dest tab))) end;
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end);
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val _ = Context.add_setup AxclassesData.init;
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val print_axclasses = AxclassesData.print;
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val lookup_info = Symtab.lookup o AxclassesData.get;
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fun get_info thy c =
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  (case lookup_info thy c of
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    NONE => error ("Unknown axclass " ^ quote c)
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  | SOME info => info);
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fun class_intros thy =
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  let val classes = Sign.classes thy in
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    map (Thm.class_triv thy) classes @
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    List.mapPartial (Option.map #intro o lookup_info thy) classes
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  end;
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(** add axiomatic type classes **)
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local
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fun err_bad_axsort ax c =
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  error ("Sort constraint in axiom " ^ quote ax ^ " not supersort of " ^ quote c);
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fun err_bad_tfrees ax =
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  error ("More than one type variable in axiom " ^ quote ax);
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fun replace_tfree T = map_term_types (Term.map_atyps (fn TFree _ => T | U => U));
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fun gen_axclass prep_class prep_axm prep_att
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    (bclass, raw_super_classes) raw_axioms_atts thy =
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  let
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    val class = Sign.full_name thy bclass;
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    val super_classes = map (prep_class thy) raw_super_classes;
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    val axms = map (prep_axm thy o fst) raw_axioms_atts;
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    val atts = map (map (prep_att thy) o snd) raw_axioms_atts;
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    (*declare class*)
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    val class_thy =
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      thy |> Theory.add_classes_i [(bclass, super_classes)];
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    (*prepare abstract axioms*)
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    fun abs_axm ax =
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      if null (term_tfrees ax) then
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        Logic.mk_implies (Logic.mk_inclass (aT [], class), ax)
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      else replace_tfree (aT [class]) ax;
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    val abs_axms = map (abs_axm o snd) axms;
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    fun axm_sort (name, ax) =
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      (case term_tfrees ax of
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        [] => []
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      | [(_, S)] => if Sign.subsort class_thy ([class], S) then S else err_bad_axsort name class
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      | _ => err_bad_tfrees name);
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    val axS = Sign.certify_sort class_thy (List.concat (map axm_sort axms));
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    val int_axm = Logic.close_form o replace_tfree (aT axS);
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    fun inclass c = Logic.mk_inclass (aT axS, c);
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    val intro_axm = Logic.list_implies
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      (map inclass super_classes @ map (int_axm o #2) axms, inclass class);
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    (*declare axioms and rule*)
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    val (([intro], [axioms]), axms_thy) =
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      class_thy
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      |> Theory.add_path (Logic.const_of_class bclass)
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      |> PureThy.add_axioms_i [Thm.no_attributes (introN, intro_axm)]
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      ||>> PureThy.add_axiomss_i [Thm.no_attributes (axiomsN, abs_axms)];
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    val info = {super_classes = super_classes, intro = intro, axioms = axioms};
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    (*store info*)
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    val (_, final_thy) =
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      axms_thy
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      |> Theory.add_finals_i false [Const (Logic.const_of_class class, a_itselfT --> propT)]
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      |> PureThy.add_thms ((map #1 axms ~~ axioms) ~~ atts)
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      ||> Theory.restore_naming class_thy
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      ||> AxclassesData.map (Symtab.update (class, info));
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  in ({intro = intro, axioms = axioms}, final_thy) end;
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in
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val add_axclass = gen_axclass Sign.intern_class Theory.read_axm Attrib.attribute;
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val add_axclass_i = gen_axclass (K I) Theory.cert_axm (K I);
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end;
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(** proven class instantiation **)
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(* primitive rules *)
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fun add_classrel ths thy =
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  let
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    fun prep_thm th =
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      let
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        val prop = Drule.plain_prop_of (Thm.transfer thy th);
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        val (c1, c2) = dest_classrel prop handle TERM _ =>
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          raise THM ("AxClass.add_classrel: not a class relation", 0, [th]);
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      in (c1, c2) end;
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  in Theory.add_classrel_i (map prep_thm ths) thy end;
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fun add_arity ths thy =
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  let
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    fun prep_thm th =
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      let
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        val prop = Drule.plain_prop_of (Thm.transfer thy th);
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        val (t, ss, c) = dest_arity prop handle TERM _ =>
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          raise THM ("AxClass.add_arity: not a type arity", 0, [th]);
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      in (t, ss, [c]) end;
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  in Theory.add_arities_i (map prep_thm ths) thy end;
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(* tactical proofs *)
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fun prove_subclass raw_rel tac thy =
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  let
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    val (c1, c2) = Sign.cert_classrel thy raw_rel;
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    val th = Goal.prove thy [] [] (mk_classrel (c1, c2)) (fn _ => tac) handle ERROR msg =>
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      cat_error msg ("The error(s) above occurred while trying to prove class relation " ^
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        quote (Sign.string_of_classrel thy [c1, c2]));
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  in add_classrel [th] thy end;
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fun prove_arity raw_arity tac thy =
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  let
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    val arity = Sign.cert_arity thy raw_arity;
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    val props = mk_arities arity;
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    val ths = Goal.prove_multi thy [] [] props
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      (fn _ => Tactic.precise_conjunction_tac (length props) 1 THEN tac) handle ERROR msg =>
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        cat_error msg ("The error(s) above occurred while trying to prove type arity " ^
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          quote (Sign.string_of_arity thy arity));
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  in add_arity ths thy end;
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end;