diff -r 450cefec7c11 -r cc19f7ca2ed6 src/HOL/Decision_Procs/Commutative_Ring.thy
--- a/src/HOL/Decision_Procs/Commutative_Ring.thy	Fri Aug 18 13:55:05 2017 +0200
+++ b/src/HOL/Decision_Procs/Commutative_Ring.thy	Fri Aug 18 20:47:47 2017 +0200
@@ -10,7 +10,7 @@
 imports
   Conversions
   Algebra_Aux
-  "~~/src/HOL/Library/Code_Target_Numeral"
+  "HOL-Library.Code_Target_Numeral"
 begin
 
 text \<open>Syntax of multivariate polynomials (pol) and polynomial expressions.\<close>