[GHC] #14806: Officially sanction certain unsafeCoerce applications with unboxed unary tuples

[GHC]

#14806: Officially sanction certain unsafeCoerce applications with unboxed unary
tuples
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Documentation     |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by andrewthad):

 I'm also interested in seeing this officially supported. For reference,
 David describes an application of this in further detail here:
 https://github.com/tibbe/unordered-containers/pull/188.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14806#comment:2>
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