[GHC] #13376: GHC fails to specialize a pair of polymorphic INLINABLE functions

[GHC]

#13376: GHC fails to specialize a pair of polymorphic INLINABLE functions
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        Reporter:  jberryman         |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  Inlining
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Runtime           |  Unknown/Multiple
  performance bug                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8668             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by jberryman):

 Also adding (per "SPECIALIZE for imported functions" from the user guide)
 in Main the following:

 {{{#!hs
 {-# SPECIALIZE hash :: Foo -> Int -> Foo #-}
 }}}

 ...results in a warning I don't really understand:

 {{{
 Ignoring useless SPECIALISE pragma for class method selector ‘hash’
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13376#comment:3>
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