author  wenzelm 
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parent 24711  e8bba7723858 
child 25223  7463251e7273 
permissions  rwrr 
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(* Title: HOL/Tools/datatype_realizer.ML 
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ID: $Id$ 
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Author: Stefan Berghofer, TU Muenchen 
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Porgram extraction from proofs involving datatypes: 
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Realizers for induction and case analysis 
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*) 
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signature DATATYPE_REALIZER = 
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sig 
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val add_dt_realizers: string list > theory > theory 
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val setup: theory > theory 
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end; 
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structure DatatypeRealizer : DATATYPE_REALIZER = 
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struct 
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open DatatypeAux; 
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fun subsets i j = if i <= j then 
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let val is = subsets (i+1) j 
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in map (fn ks => i::ks) is @ is end 
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else [[]]; 
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fun forall_intr_prf (t, prf) = 
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let val (a, T) = (case t of Var ((a, _), T) => (a, T)  Free p => p) 
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in Abst (a, SOME T, Proofterm.prf_abstract_over t prf) end; 
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fun prf_of thm = 
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let val {thy, prop, der = (_, prf), ...} = rep_thm thm 
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in Reconstruct.reconstruct_proof thy prop prf end; 

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fun prf_subst_vars inst = 
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Proofterm.map_proof_terms (subst_vars ([], inst)) I; 
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fun is_unit t = snd (strip_type (fastype_of t)) = HOLogic.unitT; 
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fun tname_of (Type (s, _)) = s 
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 tname_of _ = ""; 
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fun mk_realizes T = Const ("realizes", T > HOLogic.boolT > HOLogic.boolT); 
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fun make_ind sorts ({descr, rec_names, rec_rewrites, induction, ...} : datatype_info) is thy = 
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let 
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val recTs = get_rec_types descr sorts; 
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val pnames = if length descr = 1 then ["P"] 
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else map (fn i => "P" ^ string_of_int i) (1 upto length descr); 
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val rec_result_Ts = map (fn ((i, _), P) => 
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if i mem is then TFree ("'" ^ P, HOLogic.typeS) else HOLogic.unitT) 
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(descr ~~ pnames); 
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fun make_pred i T U r x = 
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if i mem is then 
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Free (List.nth (pnames, i), T > U > HOLogic.boolT) $ r $ x 
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else Free (List.nth (pnames, i), U > HOLogic.boolT) $ x; 

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fun mk_all i s T t = 
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if i mem is then list_all_free ([(s, T)], t) else t; 
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val (prems, rec_fns) = split_list (List.concat (snd (foldl_map 
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(fn (j, ((i, (_, _, constrs)), T)) => foldl_map (fn (j, (cname, cargs)) => 
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let 
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val Ts = map (typ_of_dtyp descr sorts) cargs; 
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val tnames = Name.variant_list pnames (DatatypeProp.make_tnames Ts); 
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val recs = List.filter (is_rec_type o fst o fst) (cargs ~~ tnames ~~ Ts); 
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val frees = tnames ~~ Ts; 
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fun mk_prems vs [] = 
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let 
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val rT = List.nth (rec_result_Ts, i); 
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val vs' = filter_out is_unit vs; 
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val f = mk_Free "f" (map fastype_of vs' > rT) j; 
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val f' = Envir.eta_contract (list_abs_free 
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(map dest_Free vs, if i mem is then list_comb (f, vs') 
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else HOLogic.unit)); 
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in (HOLogic.mk_Trueprop (make_pred i rT T (list_comb (f, vs')) 
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(list_comb (Const (cname, Ts > T), map Free frees))), f') 
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end 
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 mk_prems vs (((dt, s), T) :: ds) = 
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let 
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val k = body_index dt; 
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val (Us, U) = strip_type T; 
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val i = length Us; 
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val rT = List.nth (rec_result_Ts, k); 
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val r = Free ("r" ^ s, Us > rT); 
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val (p, f) = mk_prems (vs @ [r]) ds 
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in (mk_all k ("r" ^ s) (Us > rT) (Logic.mk_implies 
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(list_all (map (pair "x") Us, HOLogic.mk_Trueprop 
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(make_pred k rT U (app_bnds r i) 
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(app_bnds (Free (s, T)) i))), p)), f) 
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end 
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in (j + 1, 
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apfst (curry list_all_free frees) (mk_prems (map Free frees) recs)) 
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end) (j, constrs)) (1, descr ~~ recTs)))); 
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fun mk_proj j [] t = t 
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 mk_proj j (i :: is) t = if null is then t else 
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if (j: int) = i then HOLogic.mk_fst t 
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else mk_proj j is (HOLogic.mk_snd t); 
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val tnames = DatatypeProp.make_tnames recTs; 
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val fTs = map fastype_of rec_fns; 
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val ps = map (fn ((((i, _), T), U), s) => Abs ("x", T, make_pred i U T 
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(list_comb (Const (s, fTs > T > U), rec_fns) $ Bound 0) (Bound 0))) 
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(descr ~~ recTs ~~ rec_result_Ts ~~ rec_names); 
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val r = if null is then Extraction.nullt else 
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foldr1 HOLogic.mk_prod (List.mapPartial (fn (((((i, _), T), U), s), tname) => 
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if i mem is then SOME 
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(list_comb (Const (s, fTs > T > U), rec_fns) $ Free (tname, T)) 
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else NONE) (descr ~~ recTs ~~ rec_result_Ts ~~ rec_names ~~ tnames)); 
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val concl = HOLogic.mk_Trueprop (foldr1 (HOLogic.mk_binop "op &") 
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(map (fn ((((i, _), T), U), tname) => 
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make_pred i U T (mk_proj i is r) (Free (tname, T))) 
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(descr ~~ recTs ~~ rec_result_Ts ~~ tnames))); 
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val cert = cterm_of thy; 
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val inst = map (pairself cert) (map head_of (HOLogic.dest_conj 
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(HOLogic.dest_Trueprop (concl_of induction))) ~~ ps); 
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val thm = OldGoals.simple_prove_goal_cterm (cert (Logic.list_implies (prems, concl))) 
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(fn prems => 
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[rewrite_goals_tac (map mk_meta_eq [fst_conv, snd_conv]), 
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rtac (cterm_instantiate inst induction) 1, 
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ALLGOALS ObjectLogic.atomize_prems_tac, 
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rewrite_goals_tac (o_def :: map mk_meta_eq rec_rewrites), 
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REPEAT ((resolve_tac prems THEN_ALL_NEW (fn i => 
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REPEAT (etac allE i) THEN atac i)) 1)]); 
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val ind_name = Thm.get_name induction; 
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val vs = map (fn i => List.nth (pnames, i)) is; 
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val (thm', thy') = thy 
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> Sign.absolute_path 
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> PureThy.store_thm 
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((space_implode "_" (ind_name :: vs @ ["correctness"]), thm), []) 
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> Sign.restore_naming thy; 
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val ivs = rev (Term.add_vars (Logic.varify (DatatypeProp.make_ind [descr] sorts)) []); 
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val rvs = rev (Thm.fold_terms Term.add_vars thm' []); 
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val ivs1 = map Var (filter_out (fn (_, T) => 
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tname_of (body_type T) mem ["set", "bool"]) ivs); 
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val ivs2 = map (fn (ixn, _) => Var (ixn, valOf (AList.lookup (op =) rvs ixn))) ivs; 
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val prf = foldr forall_intr_prf 
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(foldr (fn ((f, p), prf) => 
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(case head_of (strip_abs_body f) of 
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Free (s, T) => 
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let val T' = Logic.varifyT T 
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in Abst (s, SOME T', Proofterm.prf_abstract_over 
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(Var ((s, 0), T')) (AbsP ("H", SOME p, prf))) 

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end 
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 _ => AbsP ("H", SOME p, prf))) 
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(Proofterm.proof_combP 
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(prf_of thm', map PBound (length prems  1 downto 0))) (rec_fns ~~ prems_of thm)) ivs2; 
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val r' = if null is then r else Logic.varify (foldr (uncurry lambda) 
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r (map Logic.unvarify ivs1 @ filter_out is_unit 
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(map (head_of o strip_abs_body) rec_fns))); 
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in Extraction.add_realizers_i [(ind_name, (vs, r', prf))] thy' end; 
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fun make_casedists sorts ({index, descr, case_name, case_rewrites, exhaustion, ...} : datatype_info) thy = 
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let 
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val cert = cterm_of thy; 
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val rT = TFree ("'P", HOLogic.typeS); 
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val rT' = TVar (("'P", 0), HOLogic.typeS); 
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fun make_casedist_prem T (cname, cargs) = 
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let 
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val Ts = map (typ_of_dtyp descr sorts) cargs; 
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val frees = Name.variant_list ["P", "y"] (DatatypeProp.make_tnames Ts) ~~ Ts; 
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val free_ts = map Free frees; 
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val r = Free ("r" ^ NameSpace.base cname, Ts > rT) 
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in (r, list_all_free (frees, Logic.mk_implies (HOLogic.mk_Trueprop 
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(HOLogic.mk_eq (Free ("y", T), list_comb (Const (cname, Ts > T), free_ts))), 
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HOLogic.mk_Trueprop (Free ("P", rT > HOLogic.boolT) $ 
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list_comb (r, free_ts))))) 
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end; 
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17521  181 
val SOME (_, _, constrs) = AList.lookup (op =) descr index; 
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val T = List.nth (get_rec_types descr sorts, index); 
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val (rs, prems) = split_list (map (make_casedist_prem T) constrs); 
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val r = Const (case_name, map fastype_of rs > T > rT); 
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val y = Var (("y", 0), Logic.legacy_varifyT T); 
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val y' = Free ("y", T); 
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val thm = OldGoals.prove_goalw_cterm [] (cert (Logic.list_implies (prems, 
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HOLogic.mk_Trueprop (Free ("P", rT > HOLogic.boolT) $ 
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list_comb (r, rs @ [y']))))) 
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(fn prems => 
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[rtac (cterm_instantiate [(cert y, cert y')] exhaustion) 1, 
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ALLGOALS (EVERY' 
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[asm_simp_tac (HOL_basic_ss addsimps case_rewrites), 
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resolve_tac prems, asm_simp_tac HOL_basic_ss])]); 
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val exh_name = Thm.get_name exhaustion; 
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val (thm', thy') = thy 
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> Sign.absolute_path 
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> PureThy.store_thm ((exh_name ^ "_P_correctness", thm), []) 
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> Sign.restore_naming thy; 
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val P = Var (("P", 0), rT' > HOLogic.boolT); 
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val prf = forall_intr_prf (y, forall_intr_prf (P, 
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foldr (fn ((p, r), prf) => 
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forall_intr_prf (Logic.legacy_varify r, AbsP ("H", SOME (Logic.varify p), 
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prf))) (Proofterm.proof_combP (prf_of thm', 
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map PBound (length prems  1 downto 0))) (prems ~~ rs))); 
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val r' = Logic.legacy_varify (Abs ("y", Logic.legacy_varifyT T, 
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list_abs (map dest_Free rs, list_comb (r, 
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map Bound ((length rs  1 downto 0) @ [length rs]))))); 
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in Extraction.add_realizers_i 
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[(exh_name, (["P"], r', prf)), 
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(exh_name, ([], Extraction.nullt, prf_of exhaustion))] thy' 
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end; 
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fun add_dt_realizers names thy = 
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if !proofs < 2 then thy 
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else let 
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val _ = message "Adding realizers for induction and case analysis ..." 
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val infos = map (DatatypePackage.the_datatype thy) names; 
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val info :: _ = infos; 
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in 
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thy 
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> fold_rev (make_ind (#sorts info) info) (subsets 0 (length (#descr info)  1)) 
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> fold_rev (make_casedists (#sorts info)) infos 
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end; 
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val setup = DatatypePackage.interpretation add_dt_realizers; 
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end; 