src/HOL/IMP/Compiler.thy

--- a/src/HOL/IMP/Compiler.thy	Tue Sep 09 17:51:07 2014 +0200
+++ b/src/HOL/IMP/Compiler.thy	Tue Sep 09 20:51:36 2014 +0200
@@ -43,7 +43,7 @@
 subsection "Instructions and Stack Machine"
 
 text_raw{*\snip{instrdef}{0}{1}{% *}
-datatype instr = 
+datatype_new instr = 
   LOADI int | LOAD vname | ADD | STORE vname |
   JMP int | JMPLESS int | JMPGE int
 text_raw{*}%endsnip*}