diff -r 07176d5b81d5 -r 6afba546f0e5 src/HOL/Proofs/Extraction/Euclid.thy
--- a/src/HOL/Proofs/Extraction/Euclid.thy	Tue Jan 02 16:17:13 2018 +0100
+++ b/src/HOL/Proofs/Extraction/Euclid.thy	Tue Jan 02 16:40:54 2018 +0100
@@ -10,8 +10,8 @@
 imports
   "HOL-Computational_Algebra.Primes"
   Util
-  "HOL-Library.Old_Datatype"
   "HOL-Library.Code_Target_Numeral"
+  "HOL-Library.Realizers"
 begin
 
 text \<open>