moved misc legacy stuff from OldGoals to Misc_Legacy;
authorwenzelm
Mon, 12 Jul 2010 21:38:37 +0200
changeset 37781 2fbbf0a48cef
parent 37780 7e91b3f98c46
child 37782 71dd62132eda
moved misc legacy stuff from OldGoals to Misc_Legacy; OldGoals: removed unused strip_context, metahyps_thms, read_term, read_prop, gethyps;
src/HOL/HOL.thy
src/HOL/IsaMakefile
src/HOL/Tools/meson.ML
src/HOL/Tools/record.ML
src/HOLCF/IOA/meta_theory/automaton.ML
src/Pure/old_goals.ML
src/Tools/misc_legacy.ML
src/ZF/IsaMakefile
src/ZF/Tools/datatype_package.ML
src/ZF/Tools/inductive_package.ML
src/ZF/ZF.thy
--- a/src/HOL/HOL.thy	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/HOL/HOL.thy	Mon Jul 12 21:38:37 2010 +0200
@@ -15,6 +15,7 @@
   "~~/src/Tools/intuitionistic.ML"
   "~~/src/Tools/project_rule.ML"
   "~~/src/Tools/cong_tac.ML"
+  "~~/src/Tools/misc_legacy.ML"
   "~~/src/Provers/hypsubst.ML"
   "~~/src/Provers/splitter.ML"
   "~~/src/Provers/classical.ML"
--- a/src/HOL/IsaMakefile	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/HOL/IsaMakefile	Mon Jul 12 21:38:37 2010 +0200
@@ -129,6 +129,7 @@
   $(SRC)/Tools/induct.ML \
   $(SRC)/Tools/induct_tacs.ML \
   $(SRC)/Tools/intuitionistic.ML \
+  $(SRC)/Tools/misc_legacy.ML \
   $(SRC)/Tools/nbe.ML \
   $(SRC)/Tools/project_rule.ML \
   $(SRC)/Tools/quickcheck.ML \
--- a/src/HOL/Tools/meson.ML	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/HOL/Tools/meson.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -140,7 +140,7 @@
                 Display.string_of_thm ctxt st ::
                 "Premises:" :: map (Display.string_of_thm ctxt) prems))
   in
-    case Seq.pull (ALLGOALS (OldGoals.METAHYPS forward_tacf) st)
+    case Seq.pull (ALLGOALS (Misc_Legacy.METAHYPS forward_tacf) st)
     of SOME(th,_) => th
      | NONE => raise THM("forward_res", 0, [st])
   end;
@@ -234,7 +234,7 @@
 fun forward_res2 ctxt nf hyps st =
   case Seq.pull
         (REPEAT
-         (OldGoals.METAHYPS (fn major::minors => rtac (nf (minors@hyps) major) 1) 1)
+         (Misc_Legacy.METAHYPS (fn major::minors => rtac (nf (minors@hyps) major) 1) 1)
          st)
   of SOME(th,_) => th
    | NONE => raise THM("forward_res2", 0, [st]);
@@ -345,8 +345,8 @@
               (*Disjunction of P, Q: Create new goal of proving ?P | ?Q and solve it using
                 all combinations of converting P, Q to CNF.*)
               let val tac =
-                  OldGoals.METAHYPS (resop cnf_nil) 1 THEN
-                   (fn st' => st' |> OldGoals.METAHYPS (resop cnf_nil) 1)
+                  Misc_Legacy.METAHYPS (resop cnf_nil) 1 THEN
+                   (fn st' => st' |> Misc_Legacy.METAHYPS (resop cnf_nil) 1)
               in  Seq.list_of (tac (th RS disj_forward)) @ ths  end
           | _ => nodups ctxt th :: ths  (*no work to do*)
       and cnf_nil th = cnf_aux (th,[])
@@ -706,7 +706,7 @@
   let val ts = Logic.strip_assums_hyp goal
   in
     EVERY'
-     [OldGoals.METAHYPS (fn hyps =>
+     [Misc_Legacy.METAHYPS (fn hyps =>
         (cut_facts_tac (skolemize_nnf_list ctxt hyps) 1
           THEN REPEAT (etac exE 1))),
       REPEAT_DETERM_N (length ts) o (etac thin_rl)] i
--- a/src/HOL/Tools/record.ML	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/HOL/Tools/record.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -273,7 +273,7 @@
 infix 0 :== ===;
 infixr 0 ==>;
 
-val op :== = OldGoals.mk_defpair;
+val op :== = Misc_Legacy.mk_defpair;
 val op === = Trueprop o HOLogic.mk_eq;
 val op ==> = Logic.mk_implies;
 
--- a/src/HOLCF/IOA/meta_theory/automaton.ML	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/HOLCF/IOA/meta_theory/automaton.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -131,7 +131,7 @@
 (* making a constructor set from a constructor term (of signature) *)
 fun constr_set_string thy atyp ctstr =
 let
-val trm = OldGoals.simple_read_term thy atyp ctstr;
+val trm = Misc_Legacy.simple_read_term thy atyp ctstr;
 val l = free_vars_of trm
 in
 if (check_for_constr thy atyp trm) then
@@ -148,7 +148,7 @@
 fun hd_of (Const(a,_)) = a |
 hd_of (t $ _) = hd_of t |
 hd_of _ = raise malformed;
-val trm = OldGoals.simple_read_term thy (Syntax.read_typ_global thy atypstr) s;
+val trm = Misc_Legacy.simple_read_term thy (Syntax.read_typ_global thy atypstr) s;
 in
 hd_of trm handle malformed =>
 error("malformed constructor of datatype " ^ atypstr ^ ": " ^ s)
@@ -177,8 +177,8 @@
 (where bool indicates whether there is a precondition *)
 fun extend thy atyp statetupel (actstr,r,[]) =
 let
-val trm = OldGoals.simple_read_term thy atyp actstr;
-val rtrm = OldGoals.simple_read_term thy (Type("bool",[])) r;
+val trm = Misc_Legacy.simple_read_term thy atyp actstr;
+val rtrm = Misc_Legacy.simple_read_term thy (Type("bool",[])) r;
 val flag = if (rtrm=Const("True",Type("bool",[]))) then false else true
 in
 if (check_for_constr thy atyp trm)
@@ -191,8 +191,8 @@
 fun pseudo_poststring [] = "" |
 pseudo_poststring ((a,b)::[]) = "(" ^ a ^ " = (" ^ b ^ "))" |
 pseudo_poststring ((a,b)::r) = "(" ^ a ^ " = (" ^ b ^ ")) & " ^ (pseudo_poststring r); 
-val trm = OldGoals.simple_read_term thy atyp actstr;
-val rtrm = OldGoals.simple_read_term thy (Type("bool",[])) r;
+val trm = Misc_Legacy.simple_read_term thy atyp actstr;
+val rtrm = Misc_Legacy.simple_read_term thy (Type("bool",[])) r;
 val flag = if (rtrm=Const("True",Type("bool",[]))) then false else true
 in
 if (check_for_constr thy atyp trm) then
@@ -366,7 +366,7 @@
 automaton_name ^ " == (" ^ automaton_name ^ "_asig, " ^ automaton_name ^
 "_initial, " ^ automaton_name ^ "_trans,{},{})")
 ])
-val chk_prime_list = (check_free_primed (OldGoals.simple_read_term thy2 (Type("bool",[]))
+val chk_prime_list = (check_free_primed (Misc_Legacy.simple_read_term thy2 (Type("bool",[]))
 ( "case act_of_" ^ automaton_name ^ " of " ^ snd(alt_string))))
 in
 (
--- a/src/Pure/old_goals.ML	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/Pure/old_goals.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -10,14 +10,6 @@
 
 signature OLD_GOALS =
 sig
-  val mk_defpair: term * term -> string * term
-  val strip_context: term -> (string * typ) list * term list * term
-  val metahyps_thms: int -> thm -> thm list option
-  val METAHYPS: (thm list -> tactic) -> int -> tactic
-  val simple_read_term: theory -> typ -> string -> term
-  val read_term: theory -> string -> term
-  val read_prop: theory -> string -> term
-  val get_def: theory -> xstring -> thm
   type proof
   val premises: unit -> thm list
   val reset_goals: unit -> unit
@@ -31,7 +23,6 @@
   val result: unit -> thm
   val uresult: unit -> thm
   val getgoal: int -> term
-  val gethyps: int -> thm list
   val print_exn: exn -> 'a
   val filter_goal: (term*term->bool) -> thm list -> int -> thm list
   val prlev: int -> unit
@@ -67,170 +58,6 @@
 structure OldGoals: OLD_GOALS =
 struct
 
-fun mk_defpair (lhs, rhs) =
-  (case Term.head_of lhs of
-    Const (name, _) =>
-      (Long_Name.base_name name ^ "_def", Logic.mk_equals (lhs, rhs))
-  | _ => raise TERM ("Malformed definition: head of lhs not a constant", [lhs, rhs]));
-
-
-(**** METAHYPS -- tactical for using hypotheses as meta-level assumptions
-       METAHYPS (fn prems => tac prems) i
-
-converts subgoal i, of the form !!x1...xm. [| A1;...;An] ==> A into a new
-proof state A==>A, supplying A1,...,An as meta-level assumptions (in
-"prems").  The parameters x1,...,xm become free variables.  If the
-resulting proof state is [| B1;...;Bk] ==> C (possibly assuming A1,...,An)
-then it is lifted back into the original context, yielding k subgoals.
-
-Replaces unknowns in the context by Frees having the prefix METAHYP_
-New unknowns in [| B1;...;Bk] ==> C are lifted over x1,...,xm.
-DOES NOT HANDLE TYPE UNKNOWNS.
-
-
-NOTE: This version does not observe the proof context, and thus cannot
-work reliably.  See also Subgoal.SUBPROOF and Subgoal.FOCUS for
-properly localized variants of the same idea.
-****)
-
-(*Strips assumptions in goal yielding  ( [x1,...,xm], [H1,...,Hn], B )
-    H1,...,Hn are the hypotheses;  x1...xm are variants of the parameters.
-  Main difference from strip_assums concerns parameters:
-    it replaces the bound variables by free variables.  *)
-fun strip_context_aux (params, Hs, Const ("==>", _) $ H $ B) =
-      strip_context_aux (params, H :: Hs, B)
-  | strip_context_aux (params, Hs, Const ("all",_) $ Abs (a, T, t)) =
-      let val (b, u) = Syntax.variant_abs (a, T, t)
-      in strip_context_aux ((b, T) :: params, Hs, u) end
-  | strip_context_aux (params, Hs, B) = (rev params, rev Hs, B);
-
-fun strip_context A = strip_context_aux ([], [], A);
-
-local
-
-  (*Left-to-right replacements: ctpairs = [...,(vi,ti),...].
-    Instantiates distinct free variables by terms of same type.*)
-  fun free_instantiate ctpairs =
-    forall_elim_list (map snd ctpairs) o forall_intr_list (map fst ctpairs);
-
-  fun free_of s ((a, i), T) =
-    Free (s ^ (case i of 0 => a | _ => a ^ "_" ^ string_of_int i), T)
-
-  fun mk_inst v = (Var v, free_of "METAHYP1_" v)
-in
-
-(*Common code for METAHYPS and metahyps_thms*)
-fun metahyps_split_prem prem =
-  let (*find all vars in the hyps -- should find tvars also!*)
-      val hyps_vars = fold Term.add_vars (Logic.strip_assums_hyp prem) []
-      val insts = map mk_inst hyps_vars
-      (*replace the hyps_vars by Frees*)
-      val prem' = subst_atomic insts prem
-      val (params,hyps,concl) = strip_context prem'
-  in (insts,params,hyps,concl)  end;
-
-fun metahyps_aux_tac tacf (prem,gno) state =
-  let val (insts,params,hyps,concl) = metahyps_split_prem prem
-      val maxidx = Thm.maxidx_of state
-      val cterm = Thm.cterm_of (Thm.theory_of_thm state)
-      val chyps = map cterm hyps
-      val hypths = map Thm.assume chyps
-      val subprems = map (Thm.forall_elim_vars 0) hypths
-      val fparams = map Free params
-      val cparams = map cterm fparams
-      fun swap_ctpair (t,u) = (cterm u, cterm t)
-      (*Subgoal variables: make Free; lift type over params*)
-      fun mk_subgoal_inst concl_vars (v, T) =
-          if member (op =) concl_vars (v, T)
-          then ((v, T), true, free_of "METAHYP2_" (v, T))
-          else ((v, T), false, free_of "METAHYP2_" (v, map #2 params ---> T))
-      (*Instantiate subgoal vars by Free applied to params*)
-      fun mk_ctpair (v, in_concl, u) =
-          if in_concl then (cterm (Var v), cterm u)
-          else (cterm (Var v), cterm (list_comb (u, fparams)))
-      (*Restore Vars with higher type and index*)
-      fun mk_subgoal_swap_ctpair (((a, i), T), in_concl, u as Free (_, U)) =
-          if in_concl then (cterm u, cterm (Var ((a, i), T)))
-          else (cterm u, cterm (Var ((a, i + maxidx), U)))
-      (*Embed B in the original context of params and hyps*)
-      fun embed B = list_all_free (params, Logic.list_implies (hyps, B))
-      (*Strip the context using elimination rules*)
-      fun elim Bhyp = implies_elim_list (forall_elim_list cparams Bhyp) hypths
-      (*A form of lifting that discharges assumptions.*)
-      fun relift st =
-        let val prop = Thm.prop_of st
-            val subgoal_vars = (*Vars introduced in the subgoals*)
-              fold Term.add_vars (Logic.strip_imp_prems prop) []
-            and concl_vars = Term.add_vars (Logic.strip_imp_concl prop) []
-            val subgoal_insts = map (mk_subgoal_inst concl_vars) subgoal_vars
-            val st' = Thm.instantiate ([], map mk_ctpair subgoal_insts) st
-            val emBs = map (cterm o embed) (prems_of st')
-            val Cth  = implies_elim_list st' (map (elim o Thm.assume) emBs)
-        in  (*restore the unknowns to the hypotheses*)
-            free_instantiate (map swap_ctpair insts @
-                              map mk_subgoal_swap_ctpair subgoal_insts)
-                (*discharge assumptions from state in same order*)
-                (implies_intr_list emBs
-                  (forall_intr_list cparams (implies_intr_list chyps Cth)))
-        end
-      (*function to replace the current subgoal*)
-      fun next st = Thm.bicompose false (false, relift st, nprems_of st) gno state
-  in Seq.maps next (tacf subprems (Thm.trivial (cterm concl))) end;
-
-end;
-
-(*Returns the theorem list that METAHYPS would supply to its tactic*)
-fun metahyps_thms i state =
-  let val prem = Logic.nth_prem (i, Thm.prop_of state)
-      and cterm = cterm_of (Thm.theory_of_thm state)
-      val (_,_,hyps,_) = metahyps_split_prem prem
-  in SOME (map (Thm.forall_elim_vars 0 o Thm.assume o cterm) hyps) end
-  handle TERM ("nth_prem", [A]) => NONE;
-
-local
-
-fun print_vars_terms n thm =
-  let
-    val thy = theory_of_thm thm
-    fun typed s ty =
-      "  " ^ s ^ " has type: " ^ Syntax.string_of_typ_global thy ty;
-    fun find_vars (Const (c, ty)) =
-          if null (Term.add_tvarsT ty []) then I
-          else insert (op =) (typed c ty)
-      | find_vars (Var (xi, ty)) =
-          insert (op =) (typed (Term.string_of_vname xi) ty)
-      | find_vars (Free _) = I
-      | find_vars (Bound _) = I
-      | find_vars (Abs (_, _, t)) = find_vars t
-      | find_vars (t1 $ t2) = find_vars t1 #> find_vars t2;
-    val prem = Logic.nth_prem (n, Thm.prop_of thm)
-    val tms = find_vars prem []
-  in warning (cat_lines ("Found schematic vars in assumptions:" :: tms)) end;
-
-in
-
-fun METAHYPS tacf n thm = SUBGOAL (metahyps_aux_tac tacf) n thm
-  handle THM("assume: variables",_,_) => (print_vars_terms n thm; Seq.empty)
-
-end;
-
-
-(* old ways of reading terms *)
-
-fun simple_read_term thy T s =
-  let
-    val ctxt = ProofContext.init_global thy
-      |> ProofContext.allow_dummies
-      |> ProofContext.set_mode ProofContext.mode_schematic;
-    val parse = if T = propT then Syntax.parse_prop else Syntax.parse_term;
-  in parse ctxt s |> Type_Infer.constrain T |> Syntax.check_term ctxt end;
-
-fun read_term thy = simple_read_term thy dummyT;
-fun read_prop thy = simple_read_term thy propT;
-
-
-fun get_def thy = Thm.axiom thy o Name_Space.intern (Theory.axiom_space thy) o Thm.def_name;
-
 
 (*** Goal package ***)
 
@@ -384,7 +211,7 @@
 
 (*Version taking the goal as a string*)
 fun prove_goalw thy rths agoal tacsf =
-  let val chorn = cterm_of thy (read_prop thy agoal)
+  let val chorn = cterm_of thy (Syntax.read_prop_global thy agoal)
   in prove_goalw_cterm_general true rths chorn tacsf end
   handle ERROR msg => cat_error msg (*from read_prop?*)
                 ("The error(s) above occurred for " ^ quote agoal);
@@ -446,15 +273,6 @@
 (*Get subgoal i from goal stack*)
 fun getgoal i = Logic.get_goal (prop_of (topthm())) i;
 
-(*Return subgoal i's hypotheses as meta-level assumptions.
-  For debugging uses of METAHYPS*)
-local exception GETHYPS of thm list
-in
-fun gethyps i =
-    (METAHYPS (fn hyps => raise (GETHYPS hyps)) i (topthm());  [])
-    handle GETHYPS hyps => hyps
-end;
-
 (*Prints exceptions nicely at top level;
   raises the exception in order to have a polymorphic type!*)
 fun print_exn e = (print_sign_exn_unit (Thm.theory_of_thm (topthm())) e;  raise e);
@@ -499,7 +317,7 @@
 
 (*Version taking the goal as a string*)
 fun agoalw atomic thy rths agoal =
-    agoalw_cterm atomic rths (cterm_of thy (read_prop thy agoal))
+    agoalw_cterm atomic rths (cterm_of thy (Syntax.read_prop_global thy agoal))
     handle ERROR msg => cat_error msg (*from type_assign, etc via prepare_proof*)
         ("The error(s) above occurred for " ^ quote agoal);
 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Tools/misc_legacy.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -0,0 +1,163 @@
+(*  Title:      Tools/misc_legacy.ML
+
+Misc legacy stuff -- to be phased out eventually.
+*)
+
+signature MISC_LEGACY =
+sig
+  val mk_defpair: term * term -> string * term
+  val get_def: theory -> xstring -> thm
+  val simple_read_term: theory -> typ -> string -> term
+  val METAHYPS: (thm list -> tactic) -> int -> tactic
+end;
+
+structure Misc_Legacy: MISC_LEGACY =
+struct
+
+fun mk_defpair (lhs, rhs) =
+  (case Term.head_of lhs of
+    Const (name, _) =>
+      (Long_Name.base_name name ^ "_def", Logic.mk_equals (lhs, rhs))
+  | _ => raise TERM ("Malformed definition: head of lhs not a constant", [lhs, rhs]));
+
+
+fun get_def thy = Thm.axiom thy o Name_Space.intern (Theory.axiom_space thy) o Thm.def_name;
+
+
+fun simple_read_term thy T s =
+  let
+    val ctxt = ProofContext.init_global thy
+      |> ProofContext.allow_dummies
+      |> ProofContext.set_mode ProofContext.mode_schematic;
+    val parse = if T = propT then Syntax.parse_prop else Syntax.parse_term;
+  in parse ctxt s |> Type_Infer.constrain T |> Syntax.check_term ctxt end;
+
+
+(**** METAHYPS -- tactical for using hypotheses as meta-level assumptions
+       METAHYPS (fn prems => tac prems) i
+
+converts subgoal i, of the form !!x1...xm. [| A1;...;An] ==> A into a new
+proof state A==>A, supplying A1,...,An as meta-level assumptions (in
+"prems").  The parameters x1,...,xm become free variables.  If the
+resulting proof state is [| B1;...;Bk] ==> C (possibly assuming A1,...,An)
+then it is lifted back into the original context, yielding k subgoals.
+
+Replaces unknowns in the context by Frees having the prefix METAHYP_
+New unknowns in [| B1;...;Bk] ==> C are lifted over x1,...,xm.
+DOES NOT HANDLE TYPE UNKNOWNS.
+
+
+NOTE: This version does not observe the proof context, and thus cannot
+work reliably.  See also Subgoal.SUBPROOF and Subgoal.FOCUS for
+properly localized variants of the same idea.
+****)
+
+local
+
+(*Strips assumptions in goal yielding  ( [x1,...,xm], [H1,...,Hn], B )
+    H1,...,Hn are the hypotheses;  x1...xm are variants of the parameters.
+  Main difference from strip_assums concerns parameters:
+    it replaces the bound variables by free variables.  *)
+fun strip_context_aux (params, Hs, Const ("==>", _) $ H $ B) =
+      strip_context_aux (params, H :: Hs, B)
+  | strip_context_aux (params, Hs, Const ("all",_) $ Abs (a, T, t)) =
+      let val (b, u) = Syntax.variant_abs (a, T, t)
+      in strip_context_aux ((b, T) :: params, Hs, u) end
+  | strip_context_aux (params, Hs, B) = (rev params, rev Hs, B);
+
+fun strip_context A = strip_context_aux ([], [], A);
+
+(*Left-to-right replacements: ctpairs = [...,(vi,ti),...].
+  Instantiates distinct free variables by terms of same type.*)
+fun free_instantiate ctpairs =
+  forall_elim_list (map snd ctpairs) o forall_intr_list (map fst ctpairs);
+
+fun free_of s ((a, i), T) =
+  Free (s ^ (case i of 0 => a | _ => a ^ "_" ^ string_of_int i), T)
+
+fun mk_inst v = (Var v, free_of "METAHYP1_" v)
+
+fun metahyps_split_prem prem =
+  let (*find all vars in the hyps -- should find tvars also!*)
+      val hyps_vars = fold Term.add_vars (Logic.strip_assums_hyp prem) []
+      val insts = map mk_inst hyps_vars
+      (*replace the hyps_vars by Frees*)
+      val prem' = subst_atomic insts prem
+      val (params,hyps,concl) = strip_context prem'
+  in (insts,params,hyps,concl)  end;
+
+fun metahyps_aux_tac tacf (prem,gno) state =
+  let val (insts,params,hyps,concl) = metahyps_split_prem prem
+      val maxidx = Thm.maxidx_of state
+      val cterm = Thm.cterm_of (Thm.theory_of_thm state)
+      val chyps = map cterm hyps
+      val hypths = map Thm.assume chyps
+      val subprems = map (Thm.forall_elim_vars 0) hypths
+      val fparams = map Free params
+      val cparams = map cterm fparams
+      fun swap_ctpair (t,u) = (cterm u, cterm t)
+      (*Subgoal variables: make Free; lift type over params*)
+      fun mk_subgoal_inst concl_vars (v, T) =
+          if member (op =) concl_vars (v, T)
+          then ((v, T), true, free_of "METAHYP2_" (v, T))
+          else ((v, T), false, free_of "METAHYP2_" (v, map #2 params ---> T))
+      (*Instantiate subgoal vars by Free applied to params*)
+      fun mk_ctpair (v, in_concl, u) =
+          if in_concl then (cterm (Var v), cterm u)
+          else (cterm (Var v), cterm (list_comb (u, fparams)))
+      (*Restore Vars with higher type and index*)
+      fun mk_subgoal_swap_ctpair (((a, i), T), in_concl, u as Free (_, U)) =
+          if in_concl then (cterm u, cterm (Var ((a, i), T)))
+          else (cterm u, cterm (Var ((a, i + maxidx), U)))
+      (*Embed B in the original context of params and hyps*)
+      fun embed B = list_all_free (params, Logic.list_implies (hyps, B))
+      (*Strip the context using elimination rules*)
+      fun elim Bhyp = implies_elim_list (forall_elim_list cparams Bhyp) hypths
+      (*A form of lifting that discharges assumptions.*)
+      fun relift st =
+        let val prop = Thm.prop_of st
+            val subgoal_vars = (*Vars introduced in the subgoals*)
+              fold Term.add_vars (Logic.strip_imp_prems prop) []
+            and concl_vars = Term.add_vars (Logic.strip_imp_concl prop) []
+            val subgoal_insts = map (mk_subgoal_inst concl_vars) subgoal_vars
+            val st' = Thm.instantiate ([], map mk_ctpair subgoal_insts) st
+            val emBs = map (cterm o embed) (prems_of st')
+            val Cth  = implies_elim_list st' (map (elim o Thm.assume) emBs)
+        in  (*restore the unknowns to the hypotheses*)
+            free_instantiate (map swap_ctpair insts @
+                              map mk_subgoal_swap_ctpair subgoal_insts)
+                (*discharge assumptions from state in same order*)
+                (implies_intr_list emBs
+                  (forall_intr_list cparams (implies_intr_list chyps Cth)))
+        end
+      (*function to replace the current subgoal*)
+      fun next st = Thm.bicompose false (false, relift st, nprems_of st) gno state
+  in Seq.maps next (tacf subprems (Thm.trivial (cterm concl))) end;
+
+fun print_vars_terms n thm =
+  let
+    val thy = theory_of_thm thm
+    fun typed s ty =
+      "  " ^ s ^ " has type: " ^ Syntax.string_of_typ_global thy ty;
+    fun find_vars (Const (c, ty)) =
+          if null (Term.add_tvarsT ty []) then I
+          else insert (op =) (typed c ty)
+      | find_vars (Var (xi, ty)) =
+          insert (op =) (typed (Term.string_of_vname xi) ty)
+      | find_vars (Free _) = I
+      | find_vars (Bound _) = I
+      | find_vars (Abs (_, _, t)) = find_vars t
+      | find_vars (t1 $ t2) = find_vars t1 #> find_vars t2;
+    val prem = Logic.nth_prem (n, Thm.prop_of thm)
+    val tms = find_vars prem []
+  in warning (cat_lines ("Found schematic vars in assumptions:" :: tms)) end;
+
+in
+
+fun METAHYPS tacf n thm = SUBGOAL (metahyps_aux_tac tacf) n thm
+  handle THM("assume: variables",_,_) => (print_vars_terms n thm; Seq.empty)
+
+end;
+
+end;
+
--- a/src/ZF/IsaMakefile	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/ZF/IsaMakefile	Mon Jul 12 21:38:37 2010 +0200
@@ -26,18 +26,19 @@
 FOL:
 	@cd $(SRC)/FOL; $(ISABELLE_TOOL) make FOL
 
-$(OUT)/ZF: $(OUT)/FOL AC.thy Arith.thy ArithSimp.thy Bin.thy Bool.thy	\
-  Cardinal.thy CardinalArith.thy Cardinal_AC.thy Datatype_ZF.thy	\
-  Epsilon.thy EquivClass.thy Finite.thy Fixedpt.thy Inductive_ZF.thy	\
-  InfDatatype.thy Int_ZF.thy IntArith.thy IntDiv_ZF.thy List_ZF.thy	\
-  Main.thy Main_ZF.thy Main_ZFC.thy Nat_ZF.thy OrdQuant.thy Order.thy	\
-  OrderArith.thy OrderType.thy Ordinal.thy Perm.thy QPair.thy		\
-  QUniv.thy ROOT.ML Sum.thy Tools/cartprod.ML				\
-  Tools/datatype_package.ML Tools/ind_cases.ML Tools/induct_tacs.ML	\
-  Tools/inductive_package.ML Tools/numeral_syntax.ML			\
-  Tools/primrec_package.ML Tools/typechk.ML Trancl.thy Univ.thy WF.thy	\
-  ZF.thy Zorn.thy arith_data.ML equalities.thy func.thy ind_syntax.ML	\
-  int_arith.ML pair.thy simpdata.ML upair.thy
+$(OUT)/ZF: $(OUT)/FOL $(SRC)/Tools/misc_legacy.ML AC.thy Arith.thy	\
+  ArithSimp.thy Bin.thy Bool.thy Cardinal.thy CardinalArith.thy		\
+  Cardinal_AC.thy Datatype_ZF.thy Epsilon.thy EquivClass.thy		\
+  Finite.thy Fixedpt.thy Inductive_ZF.thy InfDatatype.thy Int_ZF.thy	\
+  IntArith.thy IntDiv_ZF.thy List_ZF.thy Main.thy Main_ZF.thy		\
+  Main_ZFC.thy Nat_ZF.thy OrdQuant.thy Order.thy OrderArith.thy		\
+  OrderType.thy Ordinal.thy Perm.thy QPair.thy QUniv.thy ROOT.ML	\
+  Sum.thy Tools/cartprod.ML Tools/datatype_package.ML			\
+  Tools/ind_cases.ML Tools/induct_tacs.ML Tools/inductive_package.ML	\
+  Tools/numeral_syntax.ML Tools/primrec_package.ML Tools/typechk.ML	\
+  Trancl.thy Univ.thy WF.thy ZF.thy Zorn.thy arith_data.ML		\
+  equalities.thy func.thy ind_syntax.ML int_arith.ML pair.thy		\
+  simpdata.ML upair.thy
 	@$(ISABELLE_TOOL) usedir -b -g true -r $(OUT)/FOL ZF
 
 
--- a/src/ZF/Tools/datatype_package.ML	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/ZF/Tools/datatype_package.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -108,7 +108,7 @@
     let val ncon = length con_ty_list    (*number of constructors*)
         fun mk_def (((id,T,syn), name, args, prems), kcon) =
               (*kcon is index of constructor*)
-            OldGoals.mk_defpair (list_comb (Const (full_name name, T), args),
+            Misc_Legacy.mk_defpair (list_comb (Const (full_name name, T), args),
                         mk_inject npart kpart
                         (mk_inject ncon kcon (mk_tuple args)))
     in  ListPair.map mk_def (con_ty_list, 1 upto ncon)  end;
@@ -157,7 +157,7 @@
   val case_const = Const (case_name, case_typ);
   val case_tm = list_comb (case_const, case_args);
 
-  val case_def = OldGoals.mk_defpair
+  val case_def = Misc_Legacy.mk_defpair
     (case_tm, Balanced_Tree.make (fn (t1, t2) => Su.elim $ t1 $ t2) (map call_case case_lists));
 
 
@@ -232,7 +232,7 @@
   val recursor_cases = map call_recursor (flat case_lists ~~ flat recursor_lists);
 
   val recursor_def =
-      OldGoals.mk_defpair
+      Misc_Legacy.mk_defpair
         (recursor_tm,
          @{const Univ.Vrecursor} $
            absfree ("rec", @{typ i}, list_comb (case_const, recursor_cases)));
@@ -300,7 +300,7 @@
 
   (*** Prove the recursor theorems ***)
 
-  val recursor_eqns = case try (OldGoals.get_def thy1) recursor_base_name of
+  val recursor_eqns = case try (Misc_Legacy.get_def thy1) recursor_base_name of
      NONE => (writeln "  [ No recursion operator ]";
               [])
    | SOME recursor_def =>
--- a/src/ZF/Tools/inductive_package.ML	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/ZF/Tools/inductive_package.ML	Mon Jul 12 21:38:37 2010 +0200
@@ -156,7 +156,7 @@
   val big_rec_tm = list_comb(Const(big_rec_name,recT), rec_params);
 
   (*The individual sets must already be declared*)
-  val axpairs = map OldGoals.mk_defpair
+  val axpairs = map Misc_Legacy.mk_defpair
         ((big_rec_tm, fp_rhs) ::
          (case parts of
              [_] => []                        (*no mutual recursion*)
@@ -179,7 +179,7 @@
 
   (*fetch fp definitions from the theory*)
   val big_rec_def::part_rec_defs =
-    map (OldGoals.get_def thy1)
+    map (Misc_Legacy.get_def thy1)
         (case rec_names of [_] => rec_names
                          | _   => big_rec_base_name::rec_names);
 
--- a/src/ZF/ZF.thy	Mon Jul 12 21:12:18 2010 +0200
+++ b/src/ZF/ZF.thy	Mon Jul 12 21:38:37 2010 +0200
@@ -5,7 +5,10 @@
 
 header{*Zermelo-Fraenkel Set Theory*}
 
-theory ZF imports FOL begin
+theory ZF
+imports FOL
+uses "~~/src/Tools/misc_legacy.ML"
+begin
 
 ML {* Unsynchronized.reset eta_contract *}