[GHC] #1853: hpc mix files for Main modules overwrite each other

[GHC]

#1853: hpc mix files for Main modules overwrite each other
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        Reporter:  guest          |                Owner:
            Type:  bug            |               Status:  new
        Priority:  lowest         |            Milestone:  8.0.1
       Component:  Code Coverage  |              Version:  6.8.1
      Resolution:                 |             Keywords:
Operating System:  Linux          |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown   |            Test Case:
      Blocked By:                 |             Blocking:
 Related Tickets:                 |  Differential Rev(s):
       Wiki Page:                 |
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Comment (by andygill):

 I've not touched hpc for years, but am happy to try help. Perhaps we could
 work on a concrete failure, and decide where to go from there? Can we
 create a small github repo with the failures, for example. The solution
 would need to integrate with cabal, for example.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/1853#comment:22>
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