[GHC] #13142: Substitution invariant failure arising from OptCoercion

[GHC]

#13142: Substitution invariant failure arising from OptCoercion
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        Reporter:  jeiea             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:                    |             Keywords:  Determinism
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 Phyx-):

 I wouldn't say the answer is ignoring the assert, if it is then what's the
 point of the assert?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13142#comment:4>
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