[GHC] #12064: tcIfaceGlobal error with existentially quantified types

[GHC]

#12064: tcIfaceGlobal error with existentially quantified types
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |
      Resolution:                    |             Keywords:  hs-boot
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2221
       Wiki Page:                    |
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Comment (by simonpj):

 Land it!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12064#comment:4>
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