[Haskell-cafe] Syntax question regarding 'import'

Hi, About this teste code: module Main (main) where { import Foreign hiding (unsafePerformIO,Foreign.Ptr,Data.Bits,) ; blo = xor 10 10 :: Int ; main = return () } Data.Bits is in the 'hiding' list. According to the syntax reference, this seems not to be allowed. GHC allows it, but do allow following code to use 'xor' from Data.Bits. I think this is correct, since 'xor' was exported by Foreign unqualified, but does 'Data.Bits' in that list mean something or it's just ignored? Haskell syntax allows a comma at the end of names to be imported or exported, like in the second line. What does that mean? Thanks, Maurício