[GHC] #12710: Make some reserved Unicode symbols "specials"

[GHC]

#12710: Make some reserved Unicode symbols "specials"
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           Reporter:  JoshPrice247   |             Owner:  JoshPrice247
               Type:  feature        |            Status:  new
  request                            |
           Priority:  low            |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
  (Parser)                           |
           Keywords:  Unicode,       |  Operating System:  Unknown/Multiple
  UnicodeSyntax                      |
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 The following comment is in `compiler/parser/Lexer.x`:
 > ToDo: ideally, → and ∷ should be "specials", so that they cannot
 > form part of a large operator.  This would let us have a better
 > syntax for kinds: ɑ∷*→* would be a legal kind signature. (maybe).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12710>
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