[GHC] #9083: symbol constructors declared prefix missing a leading colon are accepted

[GHC]

#9083: symbol constructors declared prefix missing a leading colon are accepted
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       Reporter:  aavogt             |             Owner:
           Type:  bug                |            Status:  new
       Priority:  normal             |         Milestone:
      Component:  Compiler (Parser)  |           Version:  7.8.2
       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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 {{{
 data M = (++) Int
 data N = (⌐) Int
 data Ok = (:++) Int -- correctly accepted
 }}}
 I believe ghc should reject M and N. Instead `M` and `N` are accepted, but
 there seems to be no way to use that constructor (besides say a Data
 instance)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9083>
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