[GHC] #12688: derived Show instances aren't protected from RebindableSyntax+OverloadedStrings

[GHC]

#12688: derived Show instances aren't protected from
RebindableSyntax+OverloadedStrings
-------------------------------------+-------------------------------------
        Reporter:  daviddarais       |                Owner:  RyanGlScott
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  rebindablesyntax overloadedstrings
                                     |  deriving show string
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHC rejects       |            Test Case:
  valid program                      |  deriving/should_compile/T12688
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2591
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * testcase:   => deriving/should_compile/T12688
 * status:  patch => merge


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12688#comment:6>
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