[GHC] #15627: Absent unlifted bindings

[GHC]

#15627: Absent unlifted bindings
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        Reporter:  sgraf             |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  ⊥
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9279 #4328       |  Differential Rev(s):
  #11126                             |
       Wiki Page:                    |
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Comment (by sgraf):

 Going with 2., we again get stuck in `CoreMap`, which requires an `Ord
 Literal` instance and seems exactly like the reason that we have it in the
 first place.

 Question is: Would `CoreMap` still be OK with 2.)? E.g., can we guarantee
 that we never put things of different types in the same `CoreMap`?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15627#comment:5>
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