[GHC] #11664: Core Lint failure when building warp-3.2.2

[GHC]

#11664: Core Lint failure when building warp-3.2.2
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           Reporter:  anton.dessiatov  |             Owner:
               Type:  bug              |            Status:  new
           Priority:  normal           |         Milestone:
          Component:  Compiler         |           Version:  7.10.3
           Keywords:                   |  Operating System:  Linux
       Architecture:  x86_64 (amd64)   |   Type of failure:  None/Unknown
          Test Case:                   |        Blocked By:
           Blocking:                   |   Related Tickets:
Differential Rev(s):                   |         Wiki Page:
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 When building warp-3.2.2 with `-dcore-lint` the module
 Network.Wai.Handler.Warp.HTTP2.Worker fails to compile with Core Lint
 errors.

 Steps to reproduce (assuming that you have [http://haskellstack.org Stack]
 installed):
   1. Download
 [https://hackage.haskell.org/package/warp-3.2.2/warp-3.2.2.tar.gz
 warp-3.2.2.tar.gz] from Hackage, extract it, and cd to that directory.
   2. Run `echo "resolver: lts-5.5" > stack.yaml` and then `stack build
 --ghc-options -dcore-lint`.

 The text with exact error message is attached to this ticket.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11664>
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