[GHC] #11736: Allow unsaturated uses of unlifted types in Core

[GHC]

#11736: Allow unsaturated uses of unlifted types in Core
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Oh bother, yes, you are right about unboxed tuples.  What do you mean
 about "there is an explicit check for this"?  You mean: we allow
 unrestricted un-saturated primitive type constructors, but enforce some
 other invariant?

 There really is a paper here somewhere.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11736#comment:5>
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