[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:  7.10.2
       Component:  Compiler          |                 Version:  7.11
      Resolution:  fixed             |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
                                     |  typecheck/should_compile/T10489
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * status:  closed => merge
 * milestone:  7.12.1 => 7.10.2


Comment:

 This '''does''' happen in the tip of the 7.10 branch. But you need a DEBUG
 build to know that. Please merge the commit above. Thanks!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10489#comment:4>
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