src/ZF/ex/enum.ML

+(*  Title: 	ZF/ex/enum
+    ID:         $Id$
+    Author: 	Lawrence C Paulson, Cambridge University Computer Laboratory
+    Copyright   1993  University of Cambridge
+
+Example of a BIG enumeration type
+
+Can go up to at least 100 constructors, but it takes over 10 minutes...
+*)
+
+
+(*An enumeration type with 60 contructors!  -- takes about 214 seconds!*)
+fun mk_ids a 0 = []
+  | mk_ids a n = a :: mk_ids (bump_string a) (n-1);
+
+val consts = mk_ids "con1" 60;
+
+structure Enum = Datatype_Fun
+ (val thy = Univ.thy;
+  val rec_specs = 
+      [("enum", "univ(0)",
+	  [(consts, "i")])];
+  val rec_styp = "i";
+  val ext = None
+  val sintrs = map (fn const => const ^ " : enum") consts;
+  val monos = [];
+  val type_intrs = data_typechecks
+  val type_elims = []);
+
+goal Enum.thy "~ con59=con60";
+by (SIMP_TAC (ZF_ss addrews Enum.free_iffs) 1);  (*2.3 secs*)
+result();
+