ghci prompt %s shows duplicate module names
when I import a module, and then something from the same module, the name appears twice in the prompt
ghci> :set prompt "%s > "
Prelude > import Data.Map
Prelude Data.Map > import Data.Map(unionWith)
Prelude Data.Map Data.Map >
(tested with 8.10, 9.0, and 9.2-alpha)