[GHC] #10653: PatternSynonyms should be imported/exported as part of the wildcard notation

GHC ghc-devs at haskell.org
Fri Jul 17 18:39:58 UTC 2015


#10653: PatternSynonyms should be imported/exported as part of the wildcard
notation
-------------------------------------+-------------------------------------
        Reporter:  gridaphobe        |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:  pattern
Operating System:  Unknown/Multiple  |  synonyms
 Type of failure:  None/Unknown      |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:                    |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------

Comment (by simonpj):

 I don't really agree. What would you say for
 {{{
 pattern P x = Tree (Just x)
 }}}
 would you put it in list or Maybe? What about this?
 {{{
 pattern Q x = (x, True)
 }}}
 Would you export it with pairs?

 Pattern synonyms inherently do not belong to one type in the way that data
 constructors do.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10653#comment:1>
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