[GHC] #8538: confusing specialization CORE warning, also can't mark type class instances INLINEABLE unless class defn is marked INLINEABLE

[GHC]

#8538: confusing specialization CORE warning, also  can't mark type class
instances INLINEABLE unless class defn is marked INLINEABLE
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              Reporter:  carter      |            Owner:
                  Type:  bug         |           Status:  new
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.6.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by thomie):

 Ha! This now compiles, using ghc-7.9.20141115. Maybe we should add a
 regression test?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8538#comment:1>
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