1.1 --- a/src/HOL/Library/Mapping.thy	Fri Jul 02 16:50:53 2010 +0200
     1.2 +++ b/src/HOL/Library/Mapping.thy	Fri Jul 02 17:27:44 2010 +0200
     1.3 @@ -278,6 +278,8 @@
     1.4  
     1.5  subsection {* Code generator setup *}
     1.6  
     1.7 +code_datatype empty update
     1.8 +
     1.9  instantiation mapping :: (type, type) eq
    1.10  begin
    1.11