[GHC] #7672: boot file entities are sometimes invisible and are not (semantically) unified with corresponding entities in implementing module

[GHC]

#7672: boot file entities are sometimes invisible and are not (semantically)
unified with corresponding entities in implementing module
-------------------------------------+-------------------------------------
        Reporter:  skilpat           |                   Owner:  ezyang
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:  7.4.2
  checker)                           |                Keywords:  backpack
      Resolution:                    |            Architecture:  x86_64
Operating System:  Linux             |  (amd64)
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |  rename/should_compile/T7672
      Blocked By:                    |                Blocking:  10336
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by simonpj):

 I've finally nailed this one.  I thought it was going to be easy and just
 got sucked in.  But I did lots of good clean-up along the way.
 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7672#comment:18>
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