[GHC] #8635: GHC optimisation flag ignored when importing a local module with derived type classes

[GHC]

#8635: GHC optimisation flag ignored when importing a local module with derived
type classes
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        Reporter:  NeilMitchell      |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.6.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #9370             |  Differential Revisions:
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Changes (by rwbarton):

 * related:   => #9370


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8635#comment:5>
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