Data.List.join

Hi, I'd like to propose to include the following function in Data.List: join :: [a] -> [[a]] -> [a] join x xs = concat (intersperse x xs) I find that every time I use intersperse I also concat the result. And it seems that I'm not alone: http://www.google.com/codesearch?q=file%3A%5C.hs+intersperse&btnG=Search+Code A clear majority of all the uses of intersperse also use concat on the result. I think it seems worthwhile to give a name to that idiom. The name 'join' was taken from Data.ByteString, where a similar function exists. All the best, Josef Svenningsson