[GHC] #8053: unification error with ghc head

[GHC]

#8053: unification error with ghc head
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       Reporter:  carter                   |             Owner:
           Type:  bug                      |            Status:  new
       Priority:  normal                   |         Milestone:
      Component:  Compiler (Type checker)  |           Version:  7.7
       Keywords:                           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Unknown                  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 Ben Gamari is reporting unification errors when he tries to build llvm-
 general using current GHC HEAD (7.7)
 llvm-general currently builds with 7.4 and 7.6, so unless theres
 substantial changes to how higher rank types are checked, this sounds like
 it may be a type checker bug in HEAD.

 https://github.com/bscarlet/llvm-general/issues/54 is relevant bug report,
 i'll include a copy of the information in a comment on this ticket

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8053>
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