[GHC] #13727: `-Wmissing-home-modules` doesn't properly recognize filepath-qualified modules

[GHC]

#13727: `-Wmissing-home-modules` doesn't properly recognize filepath-qualified
modules
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        Reporter:  hvr               |                Owner:  Yuras
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.2.1-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by refold):

 IMO that makes sense, given that the user can also specify -main-is via
 ghc-options.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13727#comment:4>
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