[GHC] #12513: Template Haskell boxes singleton unboxed tuples when splicing them

[GHC]

#12513: Template Haskell boxes singleton unboxed tuples when splicing them
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Template Haskell  |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC accepts       |  Unknown/Multiple
  invalid program                    |            Test Case:  th/T12513
      Blocked By:                    |             Blocking:
 Related Tickets:  #5332             |  Differential Rev(s):  Phab:D2462
       Wiki Page:                    |
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Comment (by goldfire):

 Should we really merge this? Perhaps there's code that assumes the broken
 treatment that has existed for some time...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12513#comment:4>
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