[GHC] #13311: Audit shady uses of tcSplitSigmaTy

[GHC]

#13311: Audit shady uses of tcSplitSigmaTy
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        Reporter:  RyanGlScott       |                Owner:  RyanGlScott
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      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 RyanGlScott):

 Replying to [comment:4 goldfire]:
 > I'm confused. That's not an unlifted binding!

 Good point. But the main point is that there is a discrepancy that can be
 unveiled simply by nesting `forall`s, not that the error message is off.

 (BTW, #9140 is where this error message originally comes from.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13311#comment:5>
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