[GHC] #14723: GHC 8.4.1-alpha loops infinitely when typechecking

[GHC]

#14723: GHC 8.4.1-alpha loops infinitely when typechecking
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.4.1-alpha1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Wow! This regression was //also// triggered by commit
 8e15e3d370e9c253ae0dbb330e25b72cb00cdb76 (`Improve error messages around
 kind mismatches.`), putting it in good company with #14038 and #14720.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14723#comment:2>
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