[GHC] #12438: DeriveDataTypeable - deriving instance Data (Mu (Const ()))

[GHC]

#12438: DeriveDataTypeable - deriving instance Data (Mu (Const ()))
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        Reporter:  lspitzner         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  deriving
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2726
       Wiki Page:                    |
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Comment (by Ryan Scott <ryan.gl.scott@…>):

 In [changeset:"3bd1dd4d75fde3b922d4de08c16f29bdeb8e05d7/ghc" 3bd1dd4/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="3bd1dd4d75fde3b922d4de08c16f29bdeb8e05d7"
 Add Data instance for Const

 Summary:
 Fixes #12438. As discussed on the Haskell libraries mailing list here:
 https://mail.haskell.org/pipermail/libraries/2016-November/027396.html

 Reviewers: hvr, austin, bgamari

 Reviewed By: bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2726

 GHC Trac Issues: #12438
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12438#comment:5>
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