--- a/src/HOL/ex/Sudoku.thy Thu Sep 11 19:26:59 2014 +0200
+++ b/src/HOL/ex/Sudoku.thy Thu Sep 11 19:32:36 2014 +0200
@@ -19,7 +19,7 @@
no_notation Groups.one_class.one ("1")
-datatype_new digit = A ("1") | B ("2") | C ("3") | D ("4") | E ("5") | F ("6") | G ("7") | H ("8") | I ("9")
+datatype digit = A ("1") | B ("2") | C ("3") | D ("4") | E ("5") | F ("6") | G ("7") | H ("8") | I ("9")
definition valid :: "digit => digit => digit => digit => digit => digit => digit => digit => digit => bool" where