[GHC] #14323: Occurs check regressions in GHC 8.2.1 (and HEAD)

[GHC]

#14323: Occurs check regressions in GHC 8.2.1 (and HEAD)
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.2.1
  checker)                           |
      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 simonpj):

 > comment:3 talks about parking Coercible constraints in the insolubles

 Actually the `Coercible b (f b)` constraint is parked in the inert dicts.
 But the `b ~R# f b` constraint is parked in insolubles.  It probably
 shouldn't be.

 But in fact I want to kill off the insolubles altogether, and combine then
 with tie irreducibles.  I don't think the distinction pays its way.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14323#comment:8>
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