[GHC] #9778: Namespace collision detection for promoted types

[GHC]

#9778: Namespace collision detection for promoted types
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              Reporter:  crockeea    |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.8.3
             Component:  Compiler    |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by crockeea):

 @rwbarton `-fwarn-implicit-promoted-constructors` is an interesting
 suggestion. Just to be clear, I'm imagining that such an option would
 result in a warning whenever `S` is written but it refers to the same type
 as a `'S` promoted constructor.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9778#comment:7>
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