[GHC] #11059: panic in type hole when using 'ScopedTypeVariables'

[GHC]

#11059: panic in type hole when using 'ScopedTypeVariables'
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        Reporter:  dimitri-xyz   |                Owner:
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Compiler      |              Version:  7.10.2
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by goldfire):

 We generally prefer if you can reproduce the bug without external
 libraries. In this case, not only do you use `pipes` and `fingertree`, but
 you also use `pipes-concurrency`. The latter, sadly, does not build with
 HEAD because it depends on `stm`, which doesn't build.

 So I've tried testing this and failed, but you will too, with the exact
 same problem. Can you simplify your test case to remove the dependencies?
 If there are no packages used, it's much much easier for us to test.
 Thanks!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11059#comment:3>
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