[GHC] #15315: Renamer plugins could run after each group has been renamed

[GHC]

#15315: Renamer plugins could run after each group has been renamed
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           Reporter:  mpickering     |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:  plugins        |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In discussion with Ben, he suggested that it might be possible for a
 renamer plugin to run after each group had been renamed. This would then
 make it possible to modify renamed bindings.

 Currently, the interface for renamer plugins is quite strange and they run
 just before typechecker plugins in the implementation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15315>
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