(*  Title:      HOL/Extraction.thy

    ID:         $Id$

    Author:     Stefan Berghofer, TU Muenchen

*)

header {* Program extraction for HOL *}

theory Extraction

imports Option

uses "Tools/rewrite_hol_proof.ML"

begin

subsection {* Setup *}

setup {*

let

fun realizes_set_proc (Const ("realizes", Type ("fun", [Type ("Null", []), _])) $ r $

      (Const ("op :", _) $ x $ S)) = (case strip_comb S of

        (Var (ixn, U), ts) => SOME (list_comb (Var (ixn, U), ts @ [x]))

      | (Free (s, U), ts) => SOME (list_comb (Free (s, U), ts @ [x]))

      | _ => NONE)

  | realizes_set_proc (Const ("realizes", Type ("fun", [T, _])) $ r $

      (Const ("op :", _) $ x $ S)) = (case strip_comb S of

        (Var (ixn, U), ts) => SOME (list_comb (Var (ixn, T --> U), r :: ts @ [x]))

      | (Free (s, U), ts) => SOME (list_comb (Free (s, T --> U), r :: ts @ [x]))

      | _ => NONE)

  | realizes_set_proc _ = NONE;

in

  Extraction.add_types

      [("bool", ([], NONE))] #>

  Extraction.set_preprocessor (fn thy =>

      Proofterm.rewrite_proof_notypes

        ([], RewriteHOLProof.elim_cong :: ProofRewriteRules.rprocs true) o

      Proofterm.rewrite_proof thy

        (RewriteHOLProof.rews, ProofRewriteRules.rprocs true) o

      ProofRewriteRules.elim_vars (curry Const @{const_name default}))

end

*}

lemmas [extraction_expand] =

  meta_spec atomize_eq atomize_all atomize_imp atomize_conj

  allE rev_mp conjE Eq_TrueI Eq_FalseI eqTrueI eqTrueE eq_cong2

  notE' impE' impE iffE imp_cong simp_thms eq_True eq_False

  induct_forall_eq induct_implies_eq induct_equal_eq induct_conj_eq

  induct_forall_def induct_implies_def induct_equal_def induct_conj_def

  induct_atomize induct_rulify induct_rulify_fallback

  True_implies_equals TrueE

datatype sumbool = Left | Right

subsection {* Type of extracted program *}

extract_type

  "typeof (Trueprop P) \<equiv> typeof P"

  "typeof P \<equiv> Type (TYPE(Null)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE('Q)) \<Longrightarrow>

     typeof (P \<longrightarrow> Q) \<equiv> Type (TYPE('Q))"

  "typeof Q \<equiv> Type (TYPE(Null)) \<Longrightarrow> typeof (P \<longrightarrow> Q) \<equiv> Type (TYPE(Null))"

  "typeof P \<equiv> Type (TYPE('P)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE('Q)) \<Longrightarrow>

     typeof (P \<longrightarrow> Q) \<equiv> Type (TYPE('P \<Rightarrow> 'Q))"

  "(\<lambda>x. typeof (P x)) \<equiv> (\<lambda>x. Type (TYPE(Null))) \<Longrightarrow>

     typeof (\<forall>x. P x) \<equiv> Type (TYPE(Null))"

  "(\<lambda>x. typeof (P x)) \<equiv> (\<lambda>x. Type (TYPE('P))) \<Longrightarrow>

     typeof (\<forall>x::'a. P x) \<equiv> Type (TYPE('a \<Rightarrow> 'P))"

  "(\<lambda>x. typeof (P x)) \<equiv> (\<lambda>x. Type (TYPE(Null))) \<Longrightarrow>

     typeof (\<exists>x::'a. P x) \<equiv> Type (TYPE('a))"

  "(\<lambda>x. typeof (P x)) \<equiv> (\<lambda>x. Type (TYPE('P))) \<Longrightarrow>

     typeof (\<exists>x::'a. P x) \<equiv> Type (TYPE('a \<times> 'P))"

  "typeof P \<equiv> Type (TYPE(Null)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE(Null)) \<Longrightarrow>

     typeof (P \<or> Q) \<equiv> Type (TYPE(sumbool))"

  "typeof P \<equiv> Type (TYPE(Null)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE('Q)) \<Longrightarrow>

     typeof (P \<or> Q) \<equiv> Type (TYPE('Q option))"

  "typeof P \<equiv> Type (TYPE('P)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE(Null)) \<Longrightarrow>

     typeof (P \<or> Q) \<equiv> Type (TYPE('P option))"

  "typeof P \<equiv> Type (TYPE('P)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE('Q)) \<Longrightarrow>

     typeof (P \<or> Q) \<equiv> Type (TYPE('P + 'Q))"

  "typeof P \<equiv> Type (TYPE(Null)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE('Q)) \<Longrightarrow>

     typeof (P \<and> Q) \<equiv> Type (TYPE('Q))"

  "typeof P \<equiv> Type (TYPE('P)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE(Null)) \<Longrightarrow>

     typeof (P \<and> Q) \<equiv> Type (TYPE('P))"

  "typeof P \<equiv> Type (TYPE('P)) \<Longrightarrow> typeof Q \<equiv> Type (TYPE('Q)) \<Longrightarrow>

     typeof (P \<and> Q) \<equiv> Type (TYPE('P \<times> 'Q))"

  "typeof (P = Q) \<equiv> typeof ((P \<longrightarrow> Q) \<and> (Q \<longrightarrow> P))"

  "typeof (x \<in> P) \<equiv> typeof P"

subsection {* Realizability *}

realizability

  "(realizes t (Trueprop P)) \<equiv> (Trueprop (realizes t P))"

  "(typeof P) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<longrightarrow> Q)) \<equiv> (realizes Null P \<longrightarrow> realizes t Q)"

  "(typeof P) \<equiv> (Type (TYPE('P))) \<Longrightarrow>

   (typeof Q) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<longrightarrow> Q)) \<equiv> (\<forall>x::'P. realizes x P \<longrightarrow> realizes Null Q)"

  "(realizes t (P \<longrightarrow> Q)) \<equiv> (\<forall>x. realizes x P \<longrightarrow> realizes (t x) Q)"

  "(\<lambda>x. typeof (P x)) \<equiv> (\<lambda>x. Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (\<forall>x. P x)) \<equiv> (\<forall>x. realizes Null (P x))"

  "(realizes t (\<forall>x. P x)) \<equiv> (\<forall>x. realizes (t x) (P x))"

  "(\<lambda>x. typeof (P x)) \<equiv> (\<lambda>x. Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (\<exists>x. P x)) \<equiv> (realizes Null (P t))"

  "(realizes t (\<exists>x. P x)) \<equiv> (realizes (snd t) (P (fst t)))"

  "(typeof P) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

   (typeof Q) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<or> Q)) \<equiv>

     (case t of Left \<Rightarrow> realizes Null P | Right \<Rightarrow> realizes Null Q)"

  "(typeof P) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<or> Q)) \<equiv>

     (case t of None \<Rightarrow> realizes Null P | Some q \<Rightarrow> realizes q Q)"

  "(typeof Q) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<or> Q)) \<equiv>

     (case t of None \<Rightarrow> realizes Null Q | Some p \<Rightarrow> realizes p P)"

  "(realizes t (P \<or> Q)) \<equiv>

   (case t of Inl p \<Rightarrow> realizes p P | Inr q \<Rightarrow> realizes q Q)"

  "(typeof P) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<and> Q)) \<equiv> (realizes Null P \<and> realizes t Q)"

  "(typeof Q) \<equiv> (Type (TYPE(Null))) \<Longrightarrow>

     (realizes t (P \<and> Q)) \<equiv> (realizes t P \<and> realizes Null Q)"

  "(realizes t (P \<and> Q)) \<equiv> (realizes (fst t) P \<and> realizes (snd t) Q)"

  "typeof P \<equiv> Type (TYPE(Null)) \<Longrightarrow>

     realizes t (\<not> P) \<equiv> \<not> realizes Null P"

  "typeof P \<equiv> Type (TYPE('P)) \<Longrightarrow>

     realizes t (\<not> P) \<equiv> (\<forall>x::'P. \<not> realizes x P)"

  "typeof (P::bool) \<equiv> Type (TYPE(Null)) \<Longrightarrow>

   typeof Q \<equiv> Type (TYPE(Null)) \<Longrightarrow>

     realizes t (P = Q) \<equiv> realizes Null P = realizes Null Q"

  "(realizes t (P = Q)) \<equiv> (realizes t ((P \<longrightarrow> Q) \<and> (Q \<longrightarrow> P)))"

subsection {* Computational content of basic inference rules *}

theorem disjE_realizer:

  assumes r: "case x of Inl p \<Rightarrow> P p | Inr q \<Rightarrow> Q q"

  and r1: "\<And>p. P p \<Longrightarrow> R (f p)" and r2: "\<And>q. Q q \<Longrightarrow> R (g q)"

  shows "R (case x of Inl p \<Rightarrow> f p | Inr q \<Rightarrow> g q)"

proof (cases x)

  case Inl

  with r show ?thesis by simp (rule r1)

next

  case Inr

  with r show ?thesis by simp (rule r2)

qed

theorem disjE_realizer2:

  assumes r: "case x of None \<Rightarrow> P | Some q \<Rightarrow> Q q"

  and r1: "P \<Longrightarrow> R f" and r2: "\<And>q. Q q \<Longrightarrow> R (g q)"

  shows "R (case x of None \<Rightarrow> f | Some q \<Rightarrow> g q)"

proof (cases x)

  case None

  with r show ?thesis by simp (rule r1)

next

  case Some

  with r show ?thesis by simp (rule r2)

qed

theorem disjE_realizer3:

  assumes r: "case x of Left \<Rightarrow> P | Right \<Rightarrow> Q"

  and r1: "P \<Longrightarrow> R f" and r2: "Q \<Longrightarrow> R g"

  shows "R (case x of Left \<Rightarrow> f | Right \<Rightarrow> g)"

proof (cases x)

  case Left

  with r show ?thesis by simp (rule r1)

next

  case Right

  with r show ?thesis by simp (rule r2)

qed

theorem conjI_realizer:

  "P p \<Longrightarrow> Q q \<Longrightarrow> P (fst (p, q)) \<and> Q (snd (p, q))"

  by simp

theorem exI_realizer:

  "P y x \<Longrightarrow> P (snd (x, y)) (fst (x, y))" by simp

theorem exE_realizer: "P (snd p) (fst p) \<Longrightarrow>

  (\<And>x y. P y x \<Longrightarrow> Q (f x y)) \<Longrightarrow> Q (let (x, y) = p in f x y)"

  by (cases p) (simp add: Let_def)

theorem exE_realizer': "P (snd p) (fst p) \<Longrightarrow>

  (\<And>x y. P y x \<Longrightarrow> Q) \<Longrightarrow> Q" by (cases p) simp

setup {*

  Sign.add_const_constraint (@{const_name "default"}, SOME @{typ "'a::type"})

*}

realizers

  impI (P, Q): "\<lambda>pq. pq"

    "\<Lambda> P Q pq (h: _). allI \<cdot> _ \<bullet> (\<Lambda> x. impI \<cdot> _ \<cdot> _ \<bullet> (h \<cdot> x))"

  impI (P): "Null"

    "\<Lambda> P Q (h: _). allI \<cdot> _ \<bullet> (\<Lambda> x. impI \<cdot> _ \<cdot> _ \<bullet> (h \<cdot> x))"

  impI (Q): "\<lambda>q. q" "\<Lambda> P Q q. impI \<cdot> _ \<cdot> _"

  impI: "Null" "impI"

  mp (P, Q): "\<lambda>pq. pq"

    "\<Lambda> P Q pq (h: _) p. mp \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> p \<bullet> h)"

  mp (P): "Null"

    "\<Lambda> P Q (h: _) p. mp \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> p \<bullet> h)"

  mp (Q): "\<lambda>q. q" "\<Lambda> P Q q. mp \<cdot> _ \<cdot> _"

  mp: "Null" "mp"

  allI (P): "\<lambda>p. p" "\<Lambda> P p. allI \<cdot> _"

  allI: "Null" "allI"

  spec (P): "\<lambda>x p. p x" "\<Lambda> P x p. spec \<cdot> _ \<cdot> x"

  spec: "Null" "spec"

  exI (P): "\<lambda>x p. (x, p)" "\<Lambda> P x p. exI_realizer \<cdot> P \<cdot> p \<cdot> x"

  exI: "\<lambda>x. x" "\<Lambda> P x (h: _). h"

  exE (P, Q): "\<lambda>p pq. let (x, y) = p in pq x y"

    "\<Lambda> P Q p (h: _) pq. exE_realizer \<cdot> P \<cdot> p \<cdot> Q \<cdot> pq \<bullet> h"

  exE (P): "Null"

    "\<Lambda> P Q p. exE_realizer' \<cdot> _ \<cdot> _ \<cdot> _"

  exE (Q): "\<lambda>x pq. pq x"

    "\<Lambda> P Q x (h1: _) pq (h2: _). h2 \<cdot> x \<bullet> h1"

  exE: "Null"

    "\<Lambda> P Q x (h1: _) (h2: _). h2 \<cdot> x \<bullet> h1"

  conjI (P, Q): "Pair"

    "\<Lambda> P Q p (h: _) q. conjI_realizer \<cdot> P \<cdot> p \<cdot> Q \<cdot> q \<bullet> h"

  conjI (P): "\<lambda>p. p"

    "\<Lambda> P Q p. conjI \<cdot> _ \<cdot> _"

  conjI (Q): "\<lambda>q. q"

    "\<Lambda> P Q (h: _) q. conjI \<cdot> _ \<cdot> _ \<bullet> h"

  conjI: "Null" "conjI"

  conjunct1 (P, Q): "fst"

    "\<Lambda> P Q pq. conjunct1 \<cdot> _ \<cdot> _"

  conjunct1 (P): "\<lambda>p. p"

    "\<Lambda> P Q p. conjunct1 \<cdot> _ \<cdot> _"

  conjunct1 (Q): "Null"

    "\<Lambda> P Q q. conjunct1 \<cdot> _ \<cdot> _"

  conjunct1: "Null" "conjunct1"

  conjunct2 (P, Q): "snd"

    "\<Lambda> P Q pq. conjunct2 \<cdot> _ \<cdot> _"

  conjunct2 (P): "Null"

    "\<Lambda> P Q p. conjunct2 \<cdot> _ \<cdot> _"

  conjunct2 (Q): "\<lambda>p. p"

    "\<Lambda> P Q p. conjunct2 \<cdot> _ \<cdot> _"

  conjunct2: "Null" "conjunct2"

  disjI1 (P, Q): "Inl"

    "\<Lambda> P Q p. iffD2 \<cdot> _ \<cdot> _ \<bullet> (sum.cases_1 \<cdot> P \<cdot> _ \<cdot> p)"

  disjI1 (P): "Some"

    "\<Lambda> P Q p. iffD2 \<cdot> _ \<cdot> _ \<bullet> (option.cases_2 \<cdot> _ \<cdot> P \<cdot> p)"

  disjI1 (Q): "None"

    "\<Lambda> P Q. iffD2 \<cdot> _ \<cdot> _ \<bullet> (option.cases_1 \<cdot> _ \<cdot> _)"

  disjI1: "Left"

    "\<Lambda> P Q. iffD2 \<cdot> _ \<cdot> _ \<bullet> (sumbool.cases_1 \<cdot> _ \<cdot> _)"

  disjI2 (P, Q): "Inr"

    "\<Lambda> Q P q. iffD2 \<cdot> _ \<cdot> _ \<bullet> (sum.cases_2 \<cdot> _ \<cdot> Q \<cdot> q)"

  disjI2 (P): "None"

    "\<Lambda> Q P. iffD2 \<cdot> _ \<cdot> _ \<bullet> (option.cases_1 \<cdot> _ \<cdot> _)"

  disjI2 (Q): "Some"

    "\<Lambda> Q P q. iffD2 \<cdot> _ \<cdot> _ \<bullet> (option.cases_2 \<cdot> _ \<cdot> Q \<cdot> q)"

  disjI2: "Right"

    "\<Lambda> Q P. iffD2 \<cdot> _ \<cdot> _ \<bullet> (sumbool.cases_2 \<cdot> _ \<cdot> _)"

  disjE (P, Q, R): "\<lambda>pq pr qr.

     (case pq of Inl p \<Rightarrow> pr p | Inr q \<Rightarrow> qr q)"

    "\<Lambda> P Q R pq (h1: _) pr (h2: _) qr.

       disjE_realizer \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> R \<cdot> pr \<cdot> qr \<bullet> h1 \<bullet> h2"

  disjE (Q, R): "\<lambda>pq pr qr.

     (case pq of None \<Rightarrow> pr | Some q \<Rightarrow> qr q)"

    "\<Lambda> P Q R pq (h1: _) pr (h2: _) qr.

       disjE_realizer2 \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> R \<cdot> pr \<cdot> qr \<bullet> h1 \<bullet> h2"

  disjE (P, R): "\<lambda>pq pr qr.

     (case pq of None \<Rightarrow> qr | Some p \<Rightarrow> pr p)"

    "\<Lambda> P Q R pq (h1: _) pr (h2: _) qr (h3: _).

       disjE_realizer2 \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> R \<cdot> qr \<cdot> pr \<bullet> h1 \<bullet> h3 \<bullet> h2"

  disjE (R): "\<lambda>pq pr qr.

     (case pq of Left \<Rightarrow> pr | Right \<Rightarrow> qr)"

    "\<Lambda> P Q R pq (h1: _) pr (h2: _) qr.

       disjE_realizer3 \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> R \<cdot> pr \<cdot> qr \<bullet> h1 \<bullet> h2"

  disjE (P, Q): "Null"

    "\<Lambda> P Q R pq. disjE_realizer \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> (\<lambda>x. R) \<cdot> _ \<cdot> _"

  disjE (Q): "Null"

    "\<Lambda> P Q R pq. disjE_realizer2 \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> (\<lambda>x. R) \<cdot> _ \<cdot> _"

  disjE (P): "Null"

    "\<Lambda> P Q R pq (h1: _) (h2: _) (h3: _).

       disjE_realizer2 \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> (\<lambda>x. R) \<cdot> _ \<cdot> _ \<bullet> h1 \<bullet> h3 \<bullet> h2"

  disjE: "Null"

    "\<Lambda> P Q R pq. disjE_realizer3 \<cdot> _ \<cdot> _ \<cdot> pq \<cdot> (\<lambda>x. R) \<cdot> _ \<cdot> _"

  FalseE (P): "default"

    "\<Lambda> P. FalseE \<cdot> _"

  FalseE: "Null" "FalseE"

  notI (P): "Null"

    "\<Lambda> P (h: _). allI \<cdot> _ \<bullet> (\<Lambda> x. notI \<cdot> _ \<bullet> (h \<cdot> x))"

  notI: "Null" "notI"

  notE (P, R): "\<lambda>p. default"

    "\<Lambda> P R (h: _) p. notE \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> p \<bullet> h)"

  notE (P): "Null"

    "\<Lambda> P R (h: _) p. notE \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> p \<bullet> h)"

  notE (R): "default"

    "\<Lambda> P R. notE \<cdot> _ \<cdot> _"

  notE: "Null" "notE"

  subst (P): "\<lambda>s t ps. ps"

    "\<Lambda> s t P (h: _) ps. subst \<cdot> s \<cdot> t \<cdot> P ps \<bullet> h"

  subst: "Null" "subst"

  iffD1 (P, Q): "fst"

    "\<Lambda> Q P pq (h: _) p.

       mp \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> p \<bullet> (conjunct1 \<cdot> _ \<cdot> _ \<bullet> h))"

  iffD1 (P): "\<lambda>p. p"

    "\<Lambda> Q P p (h: _). mp \<cdot> _ \<cdot> _ \<bullet> (conjunct1 \<cdot> _ \<cdot> _ \<bullet> h)"

  iffD1 (Q): "Null"

    "\<Lambda> Q P q1 (h: _) q2.

       mp \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> q2 \<bullet> (conjunct1 \<cdot> _ \<cdot> _ \<bullet> h))"

  iffD1: "Null" "iffD1"

  iffD2 (P, Q): "snd"

    "\<Lambda> P Q pq (h: _) q.

       mp \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> q \<bullet> (conjunct2 \<cdot> _ \<cdot> _ \<bullet> h))"

  iffD2 (P): "\<lambda>p. p"

    "\<Lambda> P Q p (h: _). mp \<cdot> _ \<cdot> _ \<bullet> (conjunct2 \<cdot> _ \<cdot> _ \<bullet> h)"

  iffD2 (Q): "Null"

    "\<Lambda> P Q q1 (h: _) q2.

       mp \<cdot> _ \<cdot> _ \<bullet> (spec \<cdot> _ \<cdot> q2 \<bullet> (conjunct2 \<cdot> _ \<cdot> _ \<bullet> h))"

  iffD2: "Null" "iffD2"

  iffI (P, Q): "Pair"

    "\<Lambda> P Q pq (h1 : _) qp (h2 : _). conjI_realizer \<cdot>

       (\<lambda>pq. \<forall>x. P x \<longrightarrow> Q (pq x)) \<cdot> pq \<cdot>

       (\<lambda>qp. \<forall>x. Q x \<longrightarrow> P (qp x)) \<cdot> qp \<bullet>

       (allI \<cdot> _ \<bullet> (\<Lambda> x. impI \<cdot> _ \<cdot> _ \<bullet> (h1 \<cdot> x))) \<bullet>

       (allI \<cdot> _ \<bullet> (\<Lambda> x. impI \<cdot> _ \<cdot> _ \<bullet> (h2 \<cdot> x)))"

  iffI (P): "\<lambda>p. p"

    "\<Lambda> P Q (h1 : _) p (h2 : _). conjI \<cdot> _ \<cdot> _ \<bullet>

       (allI \<cdot> _ \<bullet> (\<Lambda> x. impI \<cdot> _ \<cdot> _ \<bullet> (h1 \<cdot> x))) \<bullet>

       (impI \<cdot> _ \<cdot> _ \<bullet> h2)"

  iffI (Q): "\<lambda>q. q"

    "\<Lambda> P Q q (h1 : _) (h2 : _). conjI \<cdot> _ \<cdot> _ \<bullet>

       (impI \<cdot> _ \<cdot> _ \<bullet> h1) \<bullet>

       (allI \<cdot> _ \<bullet> (\<Lambda> x. impI \<cdot> _ \<cdot> _ \<bullet> (h2 \<cdot> x)))"

  iffI: "Null" "iffI"

(*

  classical: "Null"

    "\<Lambda> P. classical \<cdot> _"

*)

setup {*

  Sign.add_const_constraint (@{const_name "default"}, SOME @{typ "'a::default"})

*}

end