diff -r 0b6217fda81b -r abe08fb15a12 src/HOL/Library/Old_SMT/old_smt_normalize.ML
--- a/src/HOL/Library/Old_SMT/old_smt_normalize.ML	Fri Sep 25 20:04:25 2015 +0200
+++ b/src/HOL/Library/Old_SMT/old_smt_normalize.ML	Fri Sep 25 20:37:59 2015 +0200
@@ -21,7 +21,7 @@
 
 fun drop_fact_warning ctxt =
   Old_SMT_Config.verbose_msg ctxt (prefix "Warning: dropping assumption: " o
-    Display.string_of_thm ctxt)
+    Thm.string_of_thm ctxt)
 
 
 (* general theorem normalizations *)