[GHC] #11665: Recent master fails to build attoparsec-0.13.0.1 with core lint failure

[GHC]

#11665: Recent master fails to build attoparsec-0.13.0.1 with core lint failure
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        Reporter:  anton.dessiatov  |                Owner:
            Type:  bug              |               Status:  new
        Priority:  normal           |            Milestone:
       Component:  Compiler         |              Version:  8.1
      Resolution:                   |             Keywords:
Operating System:  Linux            |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown     |            Test Case:
      Blocked By:                   |             Blocking:
 Related Tickets:  11664            |  Differential Rev(s):
       Wiki Page:                   |
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Comment (by simonpj):

 Terrific. I've nailed this one. It's an outright bug in
 `expandTypeSynoyms`.  Patch coming.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11665#comment:3>
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