repeated import warning

Dear GHC developers,

What about compiler's warning of repeated import of items?
For the large import lists this may be useful,
and  ghc-6.01  seems to lack this:

  ------------------
  module T where
  import Maybe (isJust, isJust)
  f = isJust
  ------------------

  ghc -c T.hs  


-----------------
Serge Mechveliani
mechvel@xxxxxxxx