[GHC] #13965: COMPLETE sets nerf redundant pattern-match warnings

[GHC]

#13965: COMPLETE sets nerf redundant pattern-match warnings
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1-rc2
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms,
                                     |  PatternMatchWarnings
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Replying to [comment:3 mpickering]:
 > It's this way because removing a "redudant" match arising from a
 `COMPLETE` pragma can change what a function does.

 Really? What is an example of this?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13965#comment:4>
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