[GHC] #8779: Exhaustiveness checks for pattern synonyms

[GHC]

#8779: Exhaustiveness checks for pattern synonyms
-------------------------------------+-------------------------------------
        Reporter:  nomeata           |                Owner:  mpickering
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.8.1
  checker)                           |             Keywords:
      Resolution:                    |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2669
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 Just to check: as I understand it, you are working on this, but it's not
 ready for review.

 Can I urge you to write a ''specification'' of what you are trying to
 achieve?  A wiki page is a good place to do that.  It's super-hard to
 review code without knowing (precisely) what it is trying to do.  And it's
 annoying for you if people suggest changes to the spec after you have
 already invested a lot in the impl.

 Thanks for doing this!

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8779#comment:39>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler