diff -r acc2f1801acc -r 57752a91eec4 src/HOL/IMP/Procs.thy
--- a/src/HOL/IMP/Procs.thy	Thu Sep 11 18:54:36 2014 +0200
+++ b/src/HOL/IMP/Procs.thy	Thu Sep 11 18:54:36 2014 +0200
@@ -6,7 +6,7 @@
 
 type_synonym pname = string
 
-datatype
+datatype_new
   com = SKIP 
       | Assign vname aexp        ("_ ::= _" [1000, 61] 61)
       | Seq    com  com          ("_;;/ _"  [60, 61] 60)