[GHC] #12993: GHC 8.0.2-rc2 template Haskell interface file issue

[GHC]

#12993: GHC 8.0.2-rc2 template Haskell interface file issue
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        Reporter:  glguy             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.2
       Component:  Template Haskell  |              Version:  8.0.2-rc2
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 It appears that the following declaration is present in the interface file
 produced by 8.0.1 and that produced by 8.0.2-rc2 with an explicit export
 of `x`, but missing from 8.0.2-rc2 otherwise,
 {{{
 fb6798a720ab50725d554237e3ba2ff7
   x :: X -> Int
   RecSel Left X
 }}}

 `master` is also afflicted with this issue.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12993#comment:6>
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