[GHC] #12632: Inline and Noinline pragmas ignored for instance functions

[GHC]

#12632: Inline and Noinline pragmas ignored for instance functions
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        Reporter:  jeremy-list       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Ah now I see what you mean, thanks.

 The thing is, in the RULE when you mention `inv` you are mentioning the
 `inv` from the class declaration; and you probably do not want to put
 NOINLINE on the class method (and I doubt that works anyway).

 I think you want the rule to work for "the `inf` at type `Bool`".  The
 easiest way to do that is to name it:
 {{{
 instance Inv Bool where
   inv = invBool

 invBool :: Bool -> Bool
 {-# NOINLINE invBool #-}
 invBool = not

 {-# RULES "force-inline" forall (a :: Bool) . invBool a = not a #-}
 }}}
 Now I think you'll find it works fine.  It's a little less direct, but
 much more explicit and robust.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12632#comment:3>
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