[GHC] #14680: GHC 8.4.1-alpha panics when optimizing function using getTag and tagToEnum#

[GHC]

#14680: GHC 8.4.1-alpha panics when optimizing function using getTag and tagToEnum#
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.4.1-alpha1
      Resolution:                    |             Keywords:
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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Changes (by mpickering):

 * cc: dfeuer (added)


Comment:

 I think David was looking at this at some point?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14680#comment:1>
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