[GHC] #10817: Looping default associated type family without UndecidableInstances

[GHC]

#10817: Looping default associated type family without UndecidableInstances
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        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  7.10.3
       Component:  Compiler (Type    |              Version:  7.10.2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  indexed-
                                     |  types/should_fail/T10817
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1262
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Comment (by goldfire):

 I've just pushed a patch (relative to `ghc-7.10`) to `wip/rae`. (See
 commit 8b69b318802f59cfeb0779779cfbbebf74348fa0.) I can't validate because
 of the problem Simon already mentioned about `ghc-7.10` not building. But
 hopefully this is only a typo or two away from working.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10817#comment:8>
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