[GHC] #10420: "Care with plugin imports" is wrong / orphan RULE visibility

[GHC]

#10420: "Care with plugin imports" is wrong / orphan RULE visibility
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                   Owner:  ezyang
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Compiler (Type    |                 Version:  7.11
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:  plugins07
      Blocked By:                    |                Blocking:  10294
 Related Tickets:                    |  Differential Revisions:  Phab:D950
-------------------------------------+-------------------------------------
Changes (by ezyang):

 * priority:  low => normal


Comment:

 Marking higher since this can affect non-orphan instances too, see #10294
 for an example.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10420#comment:6>
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