[GHC] #10489: Panic in TcEvidence due to wrong role

[GHC]

#10489: Panic in TcEvidence due to wrong role
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  merge
        Priority:  highest           |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  typecheck/should_compile/T10489
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * status:  new => merge
 * testcase:   => typecheck/should_compile/T10489


Comment:

 This bug does not happen in 7.10.1, but please test this in the 7.10.2
 release candidate and merge if it happens there, too. I'm labeling this
 "merge" to make sure this doesn't get missed.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10489#comment:2>
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