[GHC] #15398: GADT deriving Ord generates inaccessible code in a pattern with constructor.

[GHC]

#15398: GADT deriving Ord generates inaccessible code in a pattern with
constructor.
---------------------------------+--------------------------------------
        Reporter:  philderbeast  |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:  8.6.1
       Component:  Compiler      |              Version:  8.2.2
      Resolution:                |             Keywords:
Operating System:  MacOS X       |         Architecture:  x86_64 (amd64)
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
---------------------------------+--------------------------------------

Comment (by simonpj):

 Maybe the `deriving` mechanism should somehow add that flag itself.  It
 already switches off a number of warnings -- why not this one too?   (With
 a Note, along the lines of comment:3, to explain.)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15398#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler