[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 simonpj):

 Its not about that.  Lint is just blindly checking the let/app invariant.

 We might additionally want to check that the arguments to
 `reallyUnsafePtrEquality#` are indeed guaranteed evaluated...  Lint could
 do that I suppose but it might well be a USER error not a GHC error.  We
 don't have a good way to check for that; hence really unsafe.

 But I have fixed GHC's internal consistency check, which is what Lint is
 about

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13027#comment:11>
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