[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.
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        Reporter:  philderbeast      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  deriving,
                                     |  PatternMatchWarnings
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:                    |
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Comment (by RyanGlScott):

 Replying to [comment:11 simonpj]:
 > * Use the same name, on the grounds that you'll seldom, if ever, want
 both in scope at the same time.

 Ah, if only. I actually did try adding a field named `ic_dflags` to
 `Implication`, and it resulted in compilation errors due to conflicting
 with `InteractiveContext`'s `ic_dflags` in certain modules, so this is a
 problem in practice.

 > * Use `implic_dflags` or something, with a short explanation about why
 it's different.

 I'll go with that idea.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15398#comment:12>
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