originally, http://git.haskell.org/ghc.git/commitdiff/7eb5e29b4a7b6fef55512bc7bf3308e712... the import looked like this: import qualified HsSyn -- hack as we want to reexport the whole module import HsSyn hiding ((<.>)) so it wasn't redundant back then at least.

commit da58d1517ce9c57514f7b2bd7d444c9e3051a717 Author: Simon Peyton Jones Date: Fri Oct 30 09:45:16 2015 +0000

Kill redundant import

I don't really understand this. GHC.hs had:

module GHC( ..., module HsSyn, ... ) where import HsSyn import qualified HsSyn -- hack as we want to reexport the whole module

GHC now reports the 'import qualified' line as redundant; and it certainly is, because 'import HsSyn' brings everything into scope qualified *and* unqualified. I have no idea why the "hack" was necessary before, but following my refactoring of tcg_used_gres (previous commit), it's reported as redundant, so I've deleted it.

I'm making it a separate commit because it seems a bit mysterious and I wanted to draw attention to it.