[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:
-------------------------------------+-------------------------------------
Changes (by simonpj):

 * testcase:  T7672 => rename/should_compile/T7672


Comment:

 Despite all this clean up, the test for #7672 ''still'' does not work.
 Reason: in module A (comment:3), the data type `T` is in scope with two
 different provenances:
  * As `LocalDef` "T"
  * As `Imported` "B.T"
 But annoyingly, `Provenance` can't represent both; currently it's an
 either/or.

 Fixing this really means changing the `Provenance` data type.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7672#comment:16>
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