src/Doc/Tutorial/Misc/Option2.thy
changeset 58860 fee7cfa69c50
parent 48985 5386df44a037
child 67406 23307fd33906
     1.1 --- a/src/Doc/Tutorial/Misc/Option2.thy	Sat Nov 01 11:40:55 2014 +0100
     1.2 +++ b/src/Doc/Tutorial/Misc/Option2.thy	Sat Nov 01 14:20:38 2014 +0100
     1.3 @@ -9,7 +9,7 @@
     1.4  Our final datatype is very simple but still eminently useful:
     1.5  *}
     1.6  
     1.7 -datatype 'a option = None | Some 'a;
     1.8 +datatype 'a option = None | Some 'a
     1.9  
    1.10  text{*\noindent
    1.11  Frequently one needs to add a distinguished element to some existing type.