[GHC] #2822: Arity expansion not working right

[GHC]

#2822: Arity expansion not working right
---------------------------------------+------------------------------------
  Reporter:  simonpj                   |          Owner:                  
      Type:  run-time performance bug  |         Status:  new             
  Priority:  normal                    |      Milestone:                  
 Component:  Compiler                  |        Version:  6.10.1          
  Severity:  normal                    |       Keywords:                  
Difficulty:  Unknown                   |       Testcase:                  
        Os:  Unknown/Multiple          |   Architecture:  Unknown/Multiple
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 With GHC 6.10, the arity of `GHC.Handle.openFile` is reported as 2.  But
 its definition is
 {{{
   openFile fp im = Prelude.catch (...) (...)
 }}}
 and `Prelude.catch` has arity 3.  Somehow `openFile` isn't getting eta-
 expanded properly.

 It's not a huge deal, but arity expansion is an important optimisation so
 I want to track places it isn't happening.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2822>
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