[GHC] #10182: lookupIfaceGlobal crash with SOURCE import

[GHC]

#10182: lookupIfaceGlobal crash with SOURCE import
-------------------------------------+-------------------------------------
        Reporter:  simonpj           |                   Owner:  ezyang
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
                                     |  https://phabricator.haskell.org/D860
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Comment (by simonpj):

 Current status is confusing:

  * This ticket is about self-SOURCE import, and will be fixed by
 Phab:D860.

  * When Phab:D860 is applied, it reveals yet another bug: symptoms in
 comment:9.  Simon fixed this new bug comment:10.

  * Independently, the test for #8473 was marked as failing because of the
 Lint arity error, even with `--make`, but Simon's fix fixed that.

 Conclusion: just commit Phab:D862 (remove self-SOURCE imports from test
 suite) and Phab:D860 (fix this ticket) and everything will be fine. Edward
 will do this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10182#comment:11>
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