[GHC] #11440: GHC.Prim does not export Constraint

[GHC]

#11440: GHC.Prim does not export Constraint
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        Reporter:  thomie            |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      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 goldfire):

 As I understand it, `GHC.Exts` is the One Official Place from where to
 import magic GHC gubbins, so I didn't worry too much about moving things
 around behind the scenes. I'll add a note to the migration guide.

 There should not be other breakages from the kind equalities patch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11440#comment:1>
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