[GHC] #10162: Add unicode syntax for banana brackets

[GHC]

#10162: Add unicode syntax for banana brackets
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              Reporter:  zardoz      |             Owner:
                  Type:  feature     |            Status:  new
  request                            |         Milestone:
              Priority:  low         |           Version:  7.8.4
             Component:  Compiler    |  Operating System:  Unknown/Multiple
              Keywords:              |   Type of failure:  None/Unknown
          Architecture:              |        Blocked By:
  Unknown/Multiple                   |   Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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 While there is a “pretty” unicode alternative available for “-<“ within
 arrow notation (⤙), banana brackets can only be written as “(|” and “|)”,
 which is a bit of an eyesore when they are used in the middle of the fancy
 arrow glyphs.

 Maybe it would be convenient to add the following unicode alternatives,
 which to the best of my knowledge are mapped by default within the
 XCompose definitions shipped with XOrg.

   ⦆ right white parenthesis (U+2986)
   ⦅ left white parenthesis (U+2985)

 Alternatively, these would also correspond well with the plain ASCII
 syntax:

   ⦇ z notation left image bracket (U+2987)
   ⦈ z notation right image bracket (U+2988)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10162>
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