[GHC] #15234: WARNING in hptSomeThingsBelowUs when using a source plugin

[GHC]

#15234: WARNING in hptSomeThingsBelowUs when using a source plugin
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        Reporter:  mpickering        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
                                     |  SourcePlugins, plugins
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 darchon):

 The attached patch, when applied on top of the GHC 8.6 branch, fixes both
 the warnings and the errors for me. I'll see how it fares on master and
 supply a phab patch

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15234#comment:5>
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