[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 simonpj):

 > Going with 2., we again get stuck in CoreMap, which requires an Ord
 Literal instance

 Not at all!  It just requires you to build a `LiteralMap` just like
 `CoreMap`, `CoercionMap`, etc in `CoreMap`.  Using an `Ord` instance is
 very much a short-cut.

 But that's a pain -- more boilerplate.  So that pushes me a bit more
 towards the polymorphic literal solution that you propose (retaining
 `MachNullAddr` as I suggested above.  Would you like to try that?

 (Incidentally that will mean that you couldn't put a `RubbishLit` in a
 `LitCon` (because there is no facility for type application in a `LitCon`.
 But that's ok: we don't want to check for equality with rubbish values!)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15627#comment:7>
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