[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 Edward Z. Yang <ezyang@…>):

 In [changeset:"a2f9fef1d90c073ad9c2a727c5ee617057ca6c1d/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a2f9fef1d90c073ad9c2a727c5ee617057ca6c1d"
 Fix #10182 by disallowing/avoiding self {-# SOURCE #-} imports

 Summary:
 hs-boot declarations were leaking into the EPS due to
 self {-# SOURCE #-} imports, and interface loading induced by
 orphan instances.  For the former, we simply disallow self
 {-# SOURCE #-} imports; for the latter, we simply just don't
 load an interface if it would be ourself.

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

 Test Plan: validate

 Reviewers: simonpj, austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D860

 GHC Trac Issues: #10182
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10182#comment:13>
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