[GHC] #12083: ghc-8.0.1-rc4: tyConRoles sees a TcTyCon

[GHC]

#12083: ghc-8.0.1-rc4: tyConRoles sees a TcTyCon
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        Reporter:  _deepfire         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1-rc4
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:  Yes.
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 @_deepfire: Could you please change your testcase to not depend on `base-
 unicode-symbols`? That would make it easier to include it in the testsuite
 later. Thanks.

 Note to others: you can uncomment `import Prelude.Unicode` and still
 reproduce the bug.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12083#comment:1>
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