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

[GHC]

#10489: Panic in TcEvidence due to wrong role
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                   Owner:
            Type:  bug               |                  Status:  closed
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
      Resolution:  fixed             |                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 thoughtpolice):

 * status:  merge => closed
 * resolution:   => fixed
 * milestone:   => 7.12.1


Comment:

 Doesn't happen with the latest STABLE - but I've gone ahead and added a
 test to the `ghc-7.10` branch to be sure (see
 2237c9818c1cc719560821c3153ac2059094fdd5). Thanks Richard!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10489#comment:3>
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