[GHC] #13750: GHC produces incorrect coercions in hairy code

[GHC]

#13750: GHC produces incorrect coercions in hairy code
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.2
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Runtime crash     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13429            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Commit 2b74bd9d8b4c6b20f3e8d9ada12e7db645cc3c19 (Stop the specialiser
 generating loopy code), the fix for #13429, also fixed this bug! Hooray!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13750#comment:9>
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