[GHC] #12609: unused-top-binds wrongly warns about underscore-prefixed field names when DuplicateRecordFields enabled

[GHC]

#12609: unused-top-binds wrongly warns about underscore-prefixed field names when
DuplicateRecordFields enabled
-------------------------------------+-------------------------------------
        Reporter:  jml               |                Owner:  adamgundry
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer, ORF
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect         |            Test Case:
  warning at compile-time            |  overloadedrecflds/should_compile/T12609
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2549
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by adamgundry):

 * testcase:   => overloadedrecflds/should_compile/T12609
 * status:  new => patch
 * differential:   => Phab:D2549


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12609#comment:4>
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