[GHC] #8927: Multiple case match at once

25 Mar 2014


      #8927: Multiple case match at once
-------------------------------------------+-------------------------------
       Reporter:  vxanica                  |             Owner:
           Type:  feature request          |            Status:  new
       Priority:  normal                   |         Milestone:
      Component:  Compiler (Parser)        |           Version:  7.6.3
       Keywords:  case, multiple           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 In F# we can do
 {{{
 #!div style="font-size: 120%"
   {{{#!haskell
   match x with
       | 1 | 2 | 3 -> "123"
       | 4 | 5 | 6 -> "456"
   }}}
 }}}

 It will be nice if we have an extension which allows us to do
 {{{
 #!div style="font-size: 120%"
   {{{#!haskell
   case x of
        1 | 2 | 3 -> "123"
        4 | 5 | 6 -> "456"
   }}}
 }}}

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8927
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler