[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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"1fc60ea1f1fd89b90c2992d060aecb5b5a65f8c0/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1fc60ea1f1fd89b90c2992d060aecb5b5a65f8c0"
 When desugaring Use the smart mkCoreConApps and friends

 This is actually the bug that triggered Trac #9390.  We had
 an unboxed tuple (# writeArray# ..., () #), and that writeArray#
 argument isn't ok-for-speculation, so disobeys the invariant.

 The desugaring of unboxed tuples was to blame; the fix is easy.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9390#comment:16>
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