[GHC] #13027: Core lint errors compiling containers HEAD with GHC HEAD

[GHC]

#13027: Core lint errors compiling containers HEAD with GHC HEAD
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Building GHC      |            Test Case:
  failed                             |  simplCore/should_compile/T13027
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dfeuer):

 I suspect it will be helpful to enhance let/app error reporting to make it
 explain why it believes the let/app invariant is being violated. I can
 start looking into doing so today, unless Simon disagrees. One vague
 possibility is that evaluatedness tracking breaks down when the pairs are
 unboxed, but I still don't see why evaluatedness should have anything to
 do with let/app in this context.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13027#comment:18>
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