Fixed print translations for quantifiers a la "ALL x>=t. P x". These used
to fail when the other term in the comparison was itself a bound variable,
as in "EX y. ALL x>=y. P x".

--- a/src/HOL/Orderings.thy	Wed Feb 21 02:30:06 2007 +0100
+++ b/src/HOL/Orderings.thy	Wed Feb 21 13:51:12 2007 +0100
@@ -534,19 +534,20 @@
     ((Ex_binder, conj, less), ("_Ex_less", "_Ex_greater")),
     ((Ex_binder, conj, less_eq), ("_Ex_less_eq", "_Ex_greater_eq"))];
 
-  fun mk v v' c n P =
-    if v = v' andalso not (Term.exists_subterm (fn Free (x, _) => x = v | _ => false) n)
-    then Syntax.const c $ Syntax.mark_bound v' $ n $ P else raise Match;
+  fun matches_bound v t = 
+     case t of (Const ("_bound", _) $ Free (v', _)) => (v = v')
+              | _ => false
+  fun contains_var v = Term.exists_subterm (fn Free (x, _) => x = v | _ => false)
+  fun mk v c n P = Syntax.const c $ Syntax.mark_bound v $ n $ P
 
   fun tr' q = (q,
     fn [Const ("_bound", _) $ Free (v, _), Const (c, _) $ (Const (d, _) $ t $ u) $ P] =>
       (case AList.lookup (op =) trans (q, c, d) of
         NONE => raise Match
       | SOME (l, g) =>
-          (case (t, u) of
-            (Const ("_bound", _) $ Free (v', _), n) => mk v v' l n P
-          | (n, Const ("_bound", _) $ Free (v', _)) => mk v v' g n P
-          | _ => raise Match))
+          if matches_bound v t andalso not (contains_var v u) then mk v l u P
+          else if matches_bound v u andalso not (contains_var v t) then mk v g t P
+          else raise Match)
      | _ => raise Match);
 in [tr' All_binder, tr' Ex_binder] end
 *}