[GHC] #9732: Pattern synonyms and unboxed values

[GHC]

#9732: Pattern synonyms and unboxed values
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              Reporter:  monoidal    |            Owner:  cactus
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Compile-    |       Blocked By:
  time crash                         |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by simonpj):

 Yes, I see.  You don't know if the result is unlifted, but you DO know if
 `cont` has value args.  (Which it does not in this case.)

 I think you can just have the second of your two matchers, with `forall (r
 :: ?). ...`, something that is not possible in source Haskell, but which
 you can do in generated code I think.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9732#comment:14>
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