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

27 Sep 2016


      #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
           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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 An example source file which triggers the incorrect behaviour follows. I
 am currently unclear whether the effected inline and noinline pragmas are
 actually ignored by the simplifier or whether the inline rule shadowing
 warning is fired incorrectly.

 {{{#!hs
 class A a where
   (>>#) :: a -> a -> a

 instance A (Maybe a) where
   {-# NOINLINE (>>#) #-}
   a >># b = undefined

 {-# RULES
 "example" forall (a :: Maybe Int) (b :: Maybe Int) . a >># b = Just 4
  #-}
 }}}

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Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12632
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