[GHC] #9574: GHC Panic: No Skolem Info

[GHC]

#9574: GHC Panic: No Skolem Info
-------------------------------------+-------------------------------------
              Reporter:  ian_mi      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.9
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by ian_mi):

 * status:  infoneeded => new


Comment:

 Sorry for the delay, here is how this bug can be reproduced:

 1. Clone the extended-categories package from https://github.com/ian-mi
 /extended-categories and checkout tag `0.2.0`.
 2. Install the dependencies `tagged` and `constraints` into a sandbox if
 not already available.
 3. Download the attached `Bug9574.hs` file.
 3. Using GHC 7.8.3, load extended-categories into ghci using `cabal repl`
 and then load `Bug9574.hs`.

 Please let me know if you need any additional information.

 Thanks,
 Ian

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9574#comment:5>
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