[commit: ghc] master: Kill redundant import (da58d15)

[Herbert Valerio Riedel]

originally,

 http://git.haskell.org/ghc.git/commitdiff/7eb5e29b4a7b6fef55512bc7bf3308e712ca3eba

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 <simonpj at microsoft.com>
> 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.