[GHC] #12001: RFC: Add pattern synonyms to base

[GHC]

#12001: RFC: Add pattern synonyms to base
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  libraries/base    |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 With `UnboxedSums`

 {{{#!hs
 pattern Left# :: a -> (# a | b #)
 pattern Left# a = (# a | #)

 pattern Right# :: b -> (# a | b #)
 pattern Right# b = (# | b #)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12001#comment:9>
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