[GHC] #16104: Plugin name lookup behavior change from GHC 8.4 series

[GHC]

#16104: Plugin name lookup behavior change from GHC 8.4 series
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        Reporter:  lerkok            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 No I don't know why this is happening.

 In my plugins [https://github.com/ocharles/assert-
 explainer/blob/master/plugin/AssertExplainer.hs#L81 I would use] the
 `lookupOrig` function so that I can be precise about what module a
 definition is in.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16104#comment:3>
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