[GHC] #10079: Coercible solver regression: Couldn't match rep of () with Const () b

[GHC]

#10079: Coercible solver regression: Couldn't match rep of () with Const () b
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        Reporter:  glguy             |                   Owner:  goldfire
            Type:  bug               |                  Status:  new
        Priority:  high              |               Milestone:  7.10.1
       Component:  Compiler (Type    |                 Version:  7.10.1-rc1
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:  indexed-
  valid program                      |  types/should_compile/T10079
      Blocked By:                    |                Blocking:
 Related Tickets:  #7788, #8550      |  Differential Revisions:  Phab:D653
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Comment (by goldfire):

 I'm a little squeezed up against the ICFP deadline, on Feb. 27. The plan
 going forward is a solid half-day's work, I think, which I may not have.
 When is RC3 due to be cut? I can try to get to it sooner, but having a few
 days of March would make a big difference for me.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10079#comment:20>
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