[GHC] #14128: Possible bug in Renamer when dealing with orphans

[GHC]

#14128: Possible bug in Renamer when dealing with orphans
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        Reporter:  Shayan-Najd       |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.2
       Component:  Compiler (Type    |              Version:  8.2.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 I believe the testcase in Phab:D3890 should demonstrate this issue. There
 is also the question of whether `mkDependencies` also needs to remove the
 current module from `dep_finsts`. I suspect so as `calculateAvails`
 asserts the same invariant there.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14128#comment:10>
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