[GHC] #15175: ghc: panic! (the 'impossible' happened)

[GHC]

#15175: ghc: panic! (the 'impossible' happened)
-------------------------------------+-------------------------------------
        Reporter:  MADjestic         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  Arrows
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #5777, #13547     |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * keywords:   => Arrows
 * os:  Linux => Unknown/Multiple
 * architecture:  x86_64 (amd64) => Unknown/Multiple
 * related:   => #5777, #13547


Comment:

 Thanks, sighingnow. My suspicion is that this is a duplicate of #5777 or
 #13547, since:

 1. This requires `proc`-notation
 2. This involves a GADT (`Point2`)

 I'm not confident enough in this analysis to conclude it's an exact
 duplicate, but maybe someone more familiar with arrows than I can do so.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15175#comment:3>
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