diff -r 5bc338cee4a0 -r dd675800469d src/HOL/Real.thy
--- a/src/HOL/Real.thy	Wed Oct 09 23:00:52 2019 +0200
+++ b/src/HOL/Real.thy	Wed Oct 09 14:51:54 2019 +0000
@@ -816,7 +816,7 @@
     then have "\<exists>n. y < r * 2 ^ n"
       by (metis divide_less_eq less_trans mult.commute of_nat_less_two_power that)
     then show ?thesis
-      by (simp add: divide_simps)
+      by (simp add: field_split_simps)
   qed
   have PA: "\<not> P (A n)" for n
     by (induct n) (simp_all add: a)