[GHC] #9390: Inlining prevents evaluation of ignored parts of unboxed tuples

[GHC]

#9390: Inlining prevents evaluation of ignored parts of unboxed tuples
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              Reporter:  snoyberg    |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:  7.8.4
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:  Linux       |     Architecture:  x86_64 (amd64)
       Type of failure:  Incorrect   |       Difficulty:  Unknown
  result at runtime                  |       Blocked By:
             Test Case:              |  Related Tickets:
              Blocking:              |
Differential Revisions:              |
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Comment (by carter):

 On the flip side, the version in my example is also VERY weird code to
 write also, I can't imagine anything like my example occurring in the
 wild. Most uses of unsafe*PerformIO in the wild "return" a value thats
 used by the rest of the program, BUT both mine and snoymans examples are
 per se "dead code" wrt the alleged purity!

 I think my example might just simply be legal CSE wrt alleged purity.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9390#comment:9>
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