[GHC] #15473: GHC 8.6+ loops infinitely on an UndecidableInstances error message

[GHC]

#15473: GHC 8.6+ loops infinitely on an UndecidableInstances error message
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.5
  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 Ben Gamari <ben@…>):

 In [changeset:"5487f305d9dea298f0822082389d8a0225956c55/ghc"
 5487f305/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="5487f305d9dea298f0822082389d8a0225956c55"
 testsuite: Add (broken) test for #15473
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15473#comment:2>
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