[GHC] #15666: Dependent type synonym in recursive type family causes GHC to panic

[GHC]

#15666: Dependent type synonym in recursive type family causes GHC to panic
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        Reporter:  tydeu             |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by potato44):

 * keywords:  newcomer =>


Comment:

 The newcomer label is for when a newcomer (to GHC's codebase) should be
 able to fix the bug, not for the reporter being a newcomer.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15666#comment:5>
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