[GHC] #12463: SPECIALIZABLE pragma?

[GHC]

#12463: SPECIALIZABLE pragma?
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        Reporter:  bgamari           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  Inlining
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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Comment (by simonpj):

 Replying to [comment:11 nomeata]:
 > I’m sure that Andres has interest in a `RECURSIVE_SPECIALIZEABLE`
 pragma, or some variant  thereof (e.g. attached to the type class itself).

 But what ''is'' `RECURSIVE_SPECIALIZEABLE`?  It's described only in rather
 elliptical fashion above, and I have no clear idea of what its
 specification is.  Would someone care to write a spec, so we can all be
 sure we are discussing the same thing?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12463#comment:13>
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