[GHC] #10263: Role annotation should never be ambiguous

[GHC]

#10263: Role annotation should never be ambiguous
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                   Owner:  goldfire
            Type:  bug               |                  Status:  merge
        Priority:  normal            |               Milestone:  7.10.2
       Component:  Compiler (Type    |                 Version:  7.11
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  GHC rejects       |               Test Case:
  valid program                      |  roles/should_compile/T10263
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * status:  new => merge
 * testcase:   => roles/should_compile/T10263
 * milestone:   => 7.10.2


Comment:

 Merge if convenient.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10263#comment:3>
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