[GHC] #13784: Infinite loop in compiler without undecidableXXX

[GHC]

#13784: Infinite loop in compiler without undecidableXXX
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        Reporter:  tysonzero         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 This was fixed in commit 1eec1f21268af907f59b5d5c071a9a25de7369c7 (Another
 major constraint-solver refactoring). In particular, this reminds me a lot
 of #12538, wherein overlapping multi-parameter type classes with type
 families also resulted in an infinite loop at compile-time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13784#comment:2>
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