[GHC] #8556: Invalid constructor names are accepted in data declarations

[GHC]

#8556: Invalid constructor names are accepted in data declarations
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        Reporter:  dolio             |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by monoidal):

 What about `data Foo a = F | (^^^^) a a`? This is promotable, e.g. `Maybe
 ^^^^ Maybe :: Foo (* -> *)`. My suggestion is to postpone this till
 implementing KindsWithoutData, and then we can forbid `data Foo a = F |
 (^^^^) a a` but allow `data kind Foo a = F | (^^^^) a a`. See also #7725.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8556#comment:1>
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