[GHC] #11811: GHC sometimes misses a CUSK

[GHC]

#11811: GHC sometimes misses a CUSK
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by goldfire):

 * status:  new => merge
 * milestone:   => 8.0.1


Comment:

 I think this is worth merging, as it seems to be needed to compile
 `singletons`. If there's a merge problem, I can probably work around it.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11811#comment:3>
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