1.1 --- a/src/HOL/Library/Product_ord.thy	Mon Dec 10 11:24:08 2007 +0100
     1.2 +++ b/src/HOL/Library/Product_ord.thy	Mon Dec 10 11:24:09 2007 +0100
     1.3 @@ -6,7 +6,7 @@
     1.4  header {* Order on product types *}
     1.5  
     1.6  theory Product_ord
     1.7 -imports Main
     1.8 +imports PreList
     1.9  begin
    1.10  
    1.11  instantiation "*" :: (ord, ord) ord