[GHC] #8892: Ghc panics (variable not found)

[GHC]

#8892: Ghc panics (variable not found)
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        Reporter:  jwlato              |            Owner:
            Type:  bug                 |           Status:  new
        Priority:  normal              |        Milestone:
       Component:  Compiler            |          Version:  7.8.1-rc2
      Resolution:                      |         Keywords:
Operating System:  Unknown/Multiple    |     Architecture:
 Type of failure:  Compile-time crash  |  Unknown/Multiple
       Test Case:                      |       Difficulty:  Unknown
        Blocking:                      |       Blocked By:
                                       |  Related Tickets:
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"87bbc69c40d36046492d754c8d7ff02c3be6ce43/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="87bbc69c40d36046492d754c8d7ff02c3be6ce43"
 Make sure we occurrence-analyse unfoldings (fixes Trac #8892)

 For DFunUnfoldings we were failing to occurrence-analyse the unfolding,
 and that meant that a loop breaker wasn't marked as such, which in turn
 meant it was inlined away when it still had occurrence sites.  See
 Note [Occurrrence analysis of unfoldings] in CoreUnfold.

 This is a pretty long-standing bug, happily nailed by John Lato.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8892#comment:6>
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