[GHC] #11432: Cannot export operator newtype

[GHC]

#11432: Cannot export operator newtype
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        Reporter:  phadej            |                Owner:  skvadrik
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1888
       Wiki Page:                    |
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Comment (by simonpj):

 Simon M and I are really doubtful about whether fixing this is a good idea
 at all.  With the proposed fix we have
 {{{
 module M( (%%)( A, B ) ) where  -- OK
   data (%%) x y = A x | B y

 module M( (%%)( .. ) ) where   -- OK
   data (%%) x y = A x | B y

 module M( (%%) ) where         -- NOT OK
   data (%%) x y = A x | B y
 }}}
 This seems horribly non-uniform. Better just to require the `type` keyword
 in all three cases, I suggest.

 Very sorry not to have paid more attention before.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11432#comment:25>
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