adjusted for new rewrites

--- a/src/HOL/arith_data.ML	Thu Aug 20 16:37:18 1998 +0200
+++ b/src/HOL/arith_data.ML	Thu Aug 20 16:44:05 1998 +0200
@@ -230,5 +230,5 @@
 by (asm_simp_tac (simpset() addsimps [diff_Suc_le_Suc_diff RS le_less_trans,
 				      Suc_diff_n]) 1);
 by (Clarify_tac 1);
-by (asm_simp_tac (simpset() addsimps [less_imp_diff_is_0]) 1);
+by (asm_simp_tac (simpset() addsimps [Suc_le_eq]) 1);
 qed_spec_mp "diff_less_mono2";