[GHC] #10931: layers-0.1 does not compile with ghc-7.10 (likely a regression from ghc-7.8)

[GHC]

#10931: layers-0.1 does not compile with ghc-7.10 (likely a regression from
ghc-7.8)
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        Reporter:  slyfox            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.10.2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
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Comment (by slyfox):

 Replying to [comment:3 simonpj]:
 > How bad is it if this library doesn't work?  I imagine this is
 relatively rare else it'd show up more often.

 Nonworking library in 7.10 is absolutely not a problem for me.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10931#comment:5>
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