[GHC] #9356: scanl does not participate in list fusion

[GHC]

#9356: scanl does not participate in list fusion
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              Reporter:  dfeuer      |            Owner:
                  Type:  bug         |           Status:  patch
              Priority:  normal      |        Milestone:
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:  Runtime     |       Blocked By:
  performance bug                    |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Joachim Breitner <mail@…>):

 In [changeset:"d45693a5384460d22a6437b9cda463b4ec4b6a37/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="d45693a5384460d22a6437b9cda463b4ec4b6a37"
 Make scanl fuse; add scanl'

 Summary:
 Make scanl a good producer and a good consumer for fold/build
 fusion. Add strictly-accumulating scanl', which is required for
 Data.List.inits.

 Reviewers: nomeata, austin

 Reviewed By: austin

 Subscribers: spacekitteh, thomie, carter, ezyang, simonmar

 Differential Revision: https://phabricator.haskell.org/D314

 GHC Trac Issues: #9356
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9356#comment:8>
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