[GHC] #11457: Run type-checker plugins before GHC's solver

[GHC]

#11457: Run type-checker plugins before GHC's solver
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        Reporter:  gridaphobe        |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.0.1-rc1
  checker)                           |
      Resolution:                    |             Keywords:  plugin
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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Changes (by bgamari):

 * cc: angerman (added)
 * milestone:  8.2.1 => 8.4.1


Comment:

 This won't happen for 8.2.

 Angerman, you might be interested in this considering your recent
 reflections on plugins.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11457#comment:5>
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