[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:  newcomer
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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Comment (by tydeu):

 Replying to [comment:3 RyanGlScott]:
 > This appears to be fixed as of GHC 8.6.1 (it's not immediately clear
 which commit fixed this issue).

 I just tested this and yes, the issue has been resolved. :)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15666#comment:4>
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