[GHC] #5928: INLINABLE fails to specialize in presence of simple wrapper

[GHC]

#5928: INLINABLE fails to specialize in presence of simple wrapper
---------------------------------+------------------------------------------
    Reporter:  tibbe             |       Owner:                  
        Type:  bug               |      Status:  new             
    Priority:  normal            |   Milestone:                  
   Component:  Compiler          |     Version:  7.4.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
---------------------------------+------------------------------------------
Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 > Manually marking `(!)` as `INLINABLE` works, but users shouldn't have to
 do that.

 Why do you say that "users should not have to do that"?  Why are you happy
 to annotate `lookup` but not `(!)`?

 Maybe your position is:
  * every overloaded function should be `INLINABLE`.
 If that was the rule then all overloading would be specialised, at the
 cost of some code duplication.  But it's not the rule at the moment.   I
 guess we could have a flag to give that behaviour -- but then you'd  have
 to remember to use it.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5928#comment:3>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler