[GHC] #8582: Record syntax for pattern synonyms

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Wed Sep 16 15:21:29 UTC 2015


#8582: Record syntax for pattern synonyms
-------------------------------------+-------------------------------------
        Reporter:  cactus            |                   Owner:  mpickering
            Type:  feature request   |                  Status:  new
        Priority:  high              |               Milestone:  8.0.1
       Component:  Compiler          |                 Version:
      Resolution:                    |                Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:  5144              |                Blocking:
 Related Tickets:                    |  Differential Revisions:  Phab:D1152
-------------------------------------+-------------------------------------

Comment (by goldfire):

 Replying to [comment:12 mpickering]:
 > {{{#!hs
 >
 > pattern MkP :: Int -> Int -> Q
 > pattern MkP{x, y} = MkQ x1 y1
 >
 > data Q = MkQ { x1 :: Int, y1 :: Int }
 > }}}

 I imagine you meant

 {{{#!hs
 pattern MkP{x, y} = MkQ x y
 }}}

 Otherwise, I agree with what you've said above.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8582#comment:13>
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