[GHC] #8763: forM_ [1..N] does not get fused (10 times slower than go function)

[GHC]

#8763: forM_ [1..N] does not get fused (10 times slower than go function)
--------------------------------------------+------------------------------
        Reporter:  nh2                      |            Owner:
            Type:  bug                      |           Status:  new
        Priority:  normal                   |        Milestone:
       Component:  Compiler                 |          Version:  7.6.3
      Resolution:                           |         Keywords:
Operating System:  Unknown/Multiple         |     Architecture:
 Type of failure:  Runtime performance bug  |  Unknown/Multiple
       Test Case:                           |       Difficulty:  Unknown
        Blocking:                           |       Blocked By:
                                            |  Related Tickets:
--------------------------------------------+------------------------------

Comment (by simonpj):

 I've got lost in this thread.  If someone thinks there is a real bug here,
 in GHC 7.8, could you re-articulate what you think it is?

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8763#comment:13>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler