[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:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2-rc1
      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 glguy):

 The issue seemed to be that the the AlexTools module is using the `runA`
 record selector from Template Haskell but that that record selector is not
 exported to preserve an abstraction boundary

 https://github.com/GaloisInc/alex-tools/blob/master/src/AlexTools.hs#L268

 If I export runA, or define runA as a top-level definition (even without
 exporting it) the bug does away.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12993#comment:2>
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