[GHC] #15940: Source plugins should be able to opt-out from appearing in dependencies

[GHC]

#15940: Source plugins should be able to opt-out from appearing in dependencies
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        Reporter:                    |                Owner:  (none)
  facundo.dominguez                  |
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.3
       Component:  Compiler          |              Version:  8.6.2
      Resolution:                    |             Keywords:  source
                                     |  plugins
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by facundo.dominguez):

 * failure:  None/Unknown => GHC rejects valid program


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15940#comment:3>
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