diff -r 5d2d63f4363e -r 151d137f1095 src/HOL/IMP/Com.thy
--- a/src/HOL/IMP/Com.thy	Fri Apr 27 23:17:58 2012 +0200
+++ b/src/HOL/IMP/Com.thy	Sat Apr 28 07:38:22 2012 +0200
@@ -5,7 +5,7 @@
 datatype
   com = SKIP 
       | Assign vname aexp       ("_ ::= _" [1000, 61] 61)
-      | Semi   com  com         ("_;/ _"  [60, 61] 60)
+      | Seq    com  com         ("_;/ _"  [60, 61] 60)
       | If     bexp com com     ("(IF _/ THEN _/ ELSE _)"  [0, 0, 61] 61)
       | While  bexp com         ("(WHILE _/ DO _)"  [0, 61] 61)