[GHC] #9502: mapAccumL does not participate in foldr/build fusion

[GHC]

#9502: mapAccumL does not participate in foldr/build fusion
-------------------------------------+-------------------------------------
              Reporter:  dfeuer      |            Owner:
                  Type:  bug         |           Status:  patch
              Priority:  normal      |        Milestone:
             Component:              |          Version:  7.8.3
  libraries/base                     |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:  Runtime     |  Related Tickets:
  performance bug                    |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------

Comment (by Joachim Breitner <mail@…>):

 In [changeset:"d41dd03fdf0ef723ca31f5a11f07a54a15d2cbc0/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d41dd03fdf0ef723ca31f5a11f07a54a15d2cbc0"
 Make mapAccumL a good consumer

 This fixes #9502.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9502#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler