[GHC] #15648: Core Lint error with source-level unboxed equality

[GHC]

#15648: Core Lint error with source-level unboxed equality
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15209            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 > isPredTy should almost certainly return False for t1 ~# t2.

 That's a clear statement, and I think I agree -- but what argument(s) can
 you make to support that position.  After all, `t1 ~# t2` certainly is a
 constraint (predicate).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15648#comment:10>
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