[GHC] #16078: Hide -Weverything warnings for GHCi internals

[GHC]

#16078: Hide -Weverything warnings for GHCi internals
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        Reporter:  crockeea          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  GHCi              |              Version:  8.6.2
      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 RolandSenn):

 The first two warning messages are related to GHCi internal processing,
 however not the third one! The third one can be avoided by mentioning
 ''Bar.hs'' on the command line. eg:
 `stack ghci Main.hs Bar.hs --ghc-options -Weverything`

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16078#comment:2>
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