[GHC] #15289: isUnliftedType GHC panic on pattern with True :: Maybe

[GHC]

#15289: isUnliftedType GHC panic on pattern with True :: Maybe
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        Reporter:  Remi              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:  8.6.1
       Component:  Compiler (Type    |              Version:  8.4.3
  checker)                           |             Keywords:
      Resolution:                    |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Simon, is this a merge candidate for 8.6.1?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15289#comment:6>
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