[GHC] #12076: "lazy" leads to undefined reference to `stg_ap_0_upd_info'

[GHC]

#12076: "lazy" leads to undefined reference to `stg_ap_0_upd_info'
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        Reporter:  ezyang            |                Owner:  ezyang
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1-rc2
  (CodeGen)                          |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2309
       Wiki Page:                    |
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Comment (by Edward Z. Yang <ezyang@…>):

 In [changeset:"11ff1df8a7c25485c9c7508d65bcb380e592010d/ghc"
 11ff1df8/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="11ff1df8a7c25485c9c7508d65bcb380e592010d"
 Fix #12076 by inlining trivial expressions in CorePrep.

 Summary:
 This mostly follows the plan detailed by the discussion
 Simon and I had, with one difference: instead of grabbing
 the free variables of the trivial expressions to get the
 embedded Ids, we just use getIdFromTrivialExpr_maybe to extract
 out the Id.  If there is no Id, the expression cannot
 refer to a function (as there are no literal functions)
 and thus we do not need to saturate.

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>

 Test Plan: validate

 Reviewers: simonpj, austin, bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D2309

 GHC Trac Issues: #12076
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12076#comment:6>
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