[GHC] #15144: Type inference regression between GHC 8.0.2 and 8.2.2

[GHC]

#15144: Type inference regression between GHC 8.0.2 and 8.2.2
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.2.2
  checker)                           |
      Resolution:                    |             Keywords:  TypeFamilies
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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Changes (by RyanGlScott):

 * cc: simonpj (added)


Comment:

 This regression was introduced in commit
 1eec1f21268af907f59b5d5c071a9a25de7369c7 (`Another major constraint-solver
 refactoring`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15144#comment:2>
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