[GHC] #16234: Unable to resolve type families

[GHC]

#16234: Unable to resolve type families
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        Reporter:  crockeea          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #16211            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Given that:

 1. This seems to require installing things in a package database to
 trigger,
 2. It relies crucially on type families, and
 3. The type families unpredictably reduce

 I wonder if this is related to #11084 in some way.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16234#comment:2>
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