[GHC] #11708: Typechecker hangs when checking type families with -ddump-tc-trace turned on

[GHC]

#11708: Typechecker hangs when checking type families with -ddump-tc-trace turned
on
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        Reporter:  kcsongor          |                Owner:  kcsongor
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |             Keywords:  typefamilies
      Resolution:                    |  trace hangs
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2006
       Wiki Page:                    |
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Comment (by goldfire):

 I actually hit this bug locally and so merged @kcsongor's patch. Will push
 in due course.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11708#comment:3>
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