[Haskell-cafe] fromInteger for Lists

There's nothing better than making a data type an instance of Num. In particular, fromInteger is a joy. But how about lists? For example, if I have data Foo a = F [a] I can create a fromInteger such as fromInteger i = F [fromInteger i] and then a 19::(Foo Int), could become F [19]. Is it possible to do something similar for lists? So could [1,2,3]::(Foo Int) become something slightly different, say, F [1,2,3] Paul