[GHC] #10574: «the 'impossible' happened» when compiling singletons

[GHC]

#10574: «the 'impossible' happened» when compiling singletons
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              Reporter:  zardoz      |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  Compile-time
  Unknown/Multiple                   |  crash
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
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 When building the «singletons» package (v1.1.2.1 from hackage) in a fresh
 sandbox, GHC panics.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10574>
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