[GHC] #13603: Can't resolve levity polymorphic superclass

[GHC]

#13603: Can't resolve levity polymorphic superclass
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  LevityPolymorphism, TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3489
       Wiki Page:                    |
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"ab27fdcfe26759f3e4cd7e2105e7e7e83e269e48/ghc"
 ab27fdcf/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="ab27fdcfe26759f3e4cd7e2105e7e7e83e269e48"
 Add regression test for #13603

 Summary:
 Commit b207b536ded40156f9adb168565ca78e1eef2c74 (#11714) happened to
 fix #13603 as well. Let's add a regression test so that it stays fixed.

 Test Plan: make test TEST=T13603

 Reviewers: bgamari, austin, simonpj

 Reviewed By: bgamari, simonpj

 Subscribers: simonpj, rwbarton, thomie

 GHC Trac Issues: #13603

 Differential Revision: https://phabricator.haskell.org/D3489
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13603#comment:4>
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