[GHC] #9115: The kind of (=>)

[GHC]

#9115: The kind of (=>)
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       Reporter:  kosmikus          |             Owner:
           Type:  feature request   |            Status:  new
       Priority:  low               |         Milestone:
      Component:  Compiler          |           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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 This is mainly a request for clarification, and not very important.

 Is there any good (theoretical, implementation, practical, ...) reason why
 (with `ConstraintKinds`) enabled, the `=>` symbol on the type-level is
 still treated as a built-in syntactic construct rather than a type-level
 operator with
 {{{
 GHCi> :kind (=>)
 (=>) :: Constraint -> * -> *
 }}}
 Note that I'm not actually proposing to make it re-definable, but to treat
 it similarly to the `(->)` type operator.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9115>
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