[GHC] #14140: Better treatment for dataToTag

[GHC]

#14140: Better treatment for dataToTag
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:  datacon-tags
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hsyl20):

 https://git.haskell.org/ghc.git/blob/HEAD:/compiler/prelude/PrelRules.hs#l903
 ("b" case)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14140#comment:5>
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