[GHC] #12660: singletons doesn't compile with GHC 8.0.2 snapshot

[GHC]

#12660: singletons doesn't compile with GHC 8.0.2 snapshot
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           Reporter:  bgamari        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.2
          Component:  Compiler       |           Version:
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The current state of the `ghc-8.0` branch
 (a24092ff501028ca1245b508320493f394378495) apparently fails to compile the
 `singletons` library, yet 8.0.1 and `master` work fine. The compiler
 appears to loop. See
 https://github.com/goldfirere/singletons/issues/162#issuecomment-251272894.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12660>
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