[GHC] #8927: Multiple case match at once

[GHC]

#8927: Multiple case match at once
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        Reporter:  vxanica           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.1-rc2
  (Parser)                           |             Keywords:  case,
      Resolution:                    |  multiple
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #3919             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 I like the idea of disambiguating or-patterns and guards with parentheses,
 since I expect to be able to use or-patterns compositionally (nested
 within a larger pattern) anyways. So for hvr's last example
 {{{#!hs
 case x of
   (False | True) -> "123"
 }}}
 Don't know if this would cause major problems in the parser.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8927#comment:7>
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